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+/****************************************************************************
+ * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc. *
+ * *
+ * Permission is hereby granted, free of charge, to any person obtaining a *
+ * copy of this software and associated documentation files (the *
+ * "Software"), to deal in the Software without restriction, including *
+ * without limitation the rights to use, copy, modify, merge, publish, *
+ * distribute, distribute with modifications, sublicense, and/or sell *
+ * copies of the Software, and to permit persons to whom the Software is *
+ * furnished to do so, subject to the following conditions: *
+ * *
+ * The above copyright notice and this permission notice shall be included *
+ * in all copies or substantial portions of the Software. *
+ * *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
+ * *
+ * Except as contained in this notice, the name(s) of the above copyright *
+ * holders shall not be used in advertising or otherwise to promote the *
+ * sale, use or other dealings in this Software without prior written *
+ * authorization. *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Author: Juergen Pfeifer, 1995,1997 *
+ ****************************************************************************/
+
+#include "form.priv.h"
+
+MODULE_ID("$Id: frm_driver.c,v 1.86 2008/01/19 20:11:03 tom Exp $")
+
+/*----------------------------------------------------------------------------
+ This is the core module of the form library. It contains the majority
+ of the driver routines as well as the form_driver function.
+
+ Essentially this module is nearly the whole library. This is because
+ all the functions in this module depends on some others in the module,
+ so it makes no sense to split them into separate files because they
+ will always be linked together. The only acceptable concern is turnaround
+ time for this module, but now we have all Pentiums or RISCs, so what!
+
+ The driver routines are grouped into nine generic categories:
+
+ a) Page Navigation ( all functions prefixed by PN_ )
+ The current page of the form is left and some new page is
+ entered.
+ b) Inter-Field Navigation ( all functions prefixed by FN_ )
+ The current field of the form is left and some new field is
+ entered.
+ c) Intra-Field Navigation ( all functions prefixed by IFN_ )
+ The current position in the current field is changed.
+ d) Vertical Scrolling ( all functions prefixed by VSC_ )
+ Essentially this is a specialization of Intra-Field navigation.
+ It has to check for a multi-line field.
+ e) Horizontal Scrolling ( all functions prefixed by HSC_ )
+ Essentially this is a specialization of Intra-Field navigation.
+ It has to check for a single-line field.
+ f) Field Editing ( all functions prefixed by FE_ )
+ The content of the current field is changed
+ g) Edit Mode requests ( all functions prefixed by EM_ )
+ Switching between insert and overlay mode
+ h) Field-Validation requests ( all functions prefixed by FV_ )
+ Perform verifications of the field.
+ i) Choice requests ( all functions prefixed by CR_ )
+ Requests to enumerate possible field values
+ --------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+ Some remarks on the placements of assert() macros :
+ I use them only on "strategic" places, i.e. top level entries where
+ I want to make sure that things are set correctly. Throughout subordinate
+ routines I omit them mostly.
+ --------------------------------------------------------------------------*/
+
+/*
+Some options that may effect compatibility in behavior to SVr4 forms,
+but they are here to allow a more intuitive and user friendly behavior of
+our form implementation. This doesn't affect the API, so we feel it is
+uncritical.
+
+The initial implementation tries to stay very close with the behavior
+of the original SVr4 implementation, although in some areas it is quite
+clear that this isn't the most appropriate way. As far as possible this
+sources will allow you to build a forms lib that behaves quite similar
+to SVr4, but now and in the future we will give you better options.
+Perhaps at some time we will make this configurable at runtime.
+*/
+
+/* Implement a more user-friendly previous/next word behavior */
+#define FRIENDLY_PREV_NEXT_WORD (1)
+/* Fix the wrong behavior for forms with all fields inactive */
+#define FIX_FORM_INACTIVE_BUG (1)
+/* Allow dynamic field growth also when navigating past the end */
+#define GROW_IF_NAVIGATE (1)
+
+#if USE_WIDEC_SUPPORT
+#define myADDNSTR(w, s, n) wadd_wchnstr(w, s, n)
+#define myINSNSTR(w, s, n) wins_wchnstr(w, s, n)
+#define myINNSTR(w, s, n) fix_wchnstr(w, s, n)
+#define myWCWIDTH(w, y, x) cell_width(w, y, x)
+#else
+#define myADDNSTR(w, s, n) waddnstr(w, s, n)
+#define myINSNSTR(w, s, n) winsnstr(w, s, n)
+#define myINNSTR(w, s, n) winnstr(w, s, n)
+#define myWCWIDTH(w, y, x) 1
+#endif
+
+/*----------------------------------------------------------------------------
+ Forward references to some internally used static functions
+ --------------------------------------------------------------------------*/
+static int Inter_Field_Navigation(int (*const fct) (FORM *), FORM *form);
+static int FN_Next_Field(FORM *form);
+static int FN_Previous_Field(FORM *form);
+static int FE_New_Line(FORM *);
+static int FE_Delete_Previous(FORM *);
+
+/*----------------------------------------------------------------------------
+ Macro Definitions.
+
+ Some Remarks on that: I use the convention to use UPPERCASE for constants
+ defined by Macros. If I provide a macro as a kind of inline routine to
+ provide some logic, I use my Upper_Lower case style.
+ --------------------------------------------------------------------------*/
+
+/* Calculate the position of a single row in a field buffer */
+#define Position_Of_Row_In_Buffer(field,row) ((row)*(field)->dcols)
+
+/* Calculate start address for the fields buffer# N */
+#define Address_Of_Nth_Buffer(field,N) \
+ ((field)->buf + (N)*(1+Buffer_Length(field)))
+
+/* Calculate the start address of the row in the fields specified buffer# N */
+#define Address_Of_Row_In_Nth_Buffer(field,N,row) \
+ (Address_Of_Nth_Buffer(field,N) + Position_Of_Row_In_Buffer(field,row))
+
+/* Calculate the start address of the row in the fields primary buffer */
+#define Address_Of_Row_In_Buffer(field,row) \
+ Address_Of_Row_In_Nth_Buffer(field,0,row)
+
+/* Calculate the start address of the row in the forms current field
+ buffer# N */
+#define Address_Of_Current_Row_In_Nth_Buffer(form,N) \
+ Address_Of_Row_In_Nth_Buffer((form)->current,N,(form)->currow)
+
+/* Calculate the start address of the row in the forms current field
+ primary buffer */
+#define Address_Of_Current_Row_In_Buffer(form) \
+ Address_Of_Current_Row_In_Nth_Buffer(form,0)
+
+/* Calculate the address of the cursor in the forms current field
+ primary buffer */
+#define Address_Of_Current_Position_In_Nth_Buffer(form,N) \
+ (Address_Of_Current_Row_In_Nth_Buffer(form,N) + (form)->curcol)
+
+/* Calculate the address of the cursor in the forms current field
+ buffer# N */
+#define Address_Of_Current_Position_In_Buffer(form) \
+ Address_Of_Current_Position_In_Nth_Buffer(form,0)
+
+/* Logic to decide whether or not a field is actually a field with
+ vertical or horizontal scrolling */
+#define Is_Scroll_Field(field) \
+ (((field)->drows > (field)->rows) || \
+ ((field)->dcols > (field)->cols))
+
+/* Logic to decide whether or not a field needs to have an individual window
+ instead of a derived window because it contains invisible parts.
+ This is true for non-public fields and for scrollable fields. */
+#define Has_Invisible_Parts(field) \
+ (!((field)->opts & O_PUBLIC) || \
+ Is_Scroll_Field(field))
+
+/* Logic to decide whether or not a field needs justification */
+#define Justification_Allowed(field) \
+ (((field)->just != NO_JUSTIFICATION) && \
+ (Single_Line_Field(field)) && \
+ (((field)->dcols == (field)->cols) && \
+ ((field)->opts & O_STATIC)) )
+
+/* Logic to determine whether or not a dynamic field may still grow */
+#define Growable(field) ((field)->status & _MAY_GROW)
+
+/* Macro to set the attributes for a fields window */
+#define Set_Field_Window_Attributes(field,win) \
+( wbkgdset((win),(chtype)((field)->pad | (field)->back)), \
+ wattrset((win),(field)->fore) )
+
+/* Logic to decide whether or not a field really appears on the form */
+#define Field_Really_Appears(field) \
+ ((field->form) &&\
+ (field->form->status & _POSTED) &&\
+ (field->opts & O_VISIBLE) &&\
+ (field->page == field->form->curpage))
+
+/* Logic to determine whether or not we are on the first position in the
+ current field */
+#define First_Position_In_Current_Field(form) \
+ (((form)->currow==0) && ((form)->curcol==0))
+
+#define Minimum(a,b) (((a)<=(b)) ? (a) : (b))
+#define Maximum(a,b) (((a)>=(b)) ? (a) : (b))
+
+/*----------------------------------------------------------------------------
+ Useful constants
+ --------------------------------------------------------------------------*/
+static FIELD_CELL myBLANK = BLANK;
+static FIELD_CELL myZEROS;
+
+#ifdef TRACE
+static void
+check_pos(FORM *form, int lineno)
+{
+ int y, x;
+
+ if (form && form->w)
+ {
+ getyx(form->w, y, x);
+ if (y != form->currow || x != form->curcol)
+ {
+ T(("CHECKPOS %s@%d have position %d,%d vs want %d,%d",
+ __FILE__, lineno,
+ y, x,
+ form->currow, form->curcol));
+ }
+ }
+}
+#define CHECKPOS(form) check_pos(form, __LINE__)
+#else
+#define CHECKPOS(form) /* nothing */
+#endif
+
+/*----------------------------------------------------------------------------
+ Wide-character special functions
+ --------------------------------------------------------------------------*/
+#if USE_WIDEC_SUPPORT
+/* like winsnstr */
+static int
+wins_wchnstr(WINDOW *w, cchar_t *s, int n)
+{
+ int code = ERR;
+ int y, x;
+
+ while (n-- > 0)
+ {
+ getyx(w, y, x);
+ if ((code = wins_wch(w, s++)) != OK)
+ break;
+ if ((code = wmove(w, y, x + 1)) != OK)
+ break;
+ }
+ return code;
+}
+
+/* win_wchnstr is inconsistent with winnstr, since it returns OK rather than
+ * the number of items transferred.
+ */
+static int
+fix_wchnstr(WINDOW *w, cchar_t *s, int n)
+{
+ int x;
+
+ win_wchnstr(w, s, n);
+ /*
+ * This function is used to extract the text only from the window.
+ * Strip attributes and color from the string so they will not be added
+ * back when copying the string to the window.
+ */
+ for (x = 0; x < n; ++x)
+ {
+ RemAttr(s[x], A_ATTRIBUTES);
+ SetPair(s[x], 0);
+ }
+ return n;
+}
+
+/*
+ * Returns the column of the base of the given cell.
+ */
+static int
+cell_base(WINDOW *win, int y, int x)
+{
+ int result = x;
+
+ while (LEGALYX(win, y, x))
+ {
+ cchar_t *data = &(win->_line[y].text[x]);
+
+ if (isWidecBase(CHDEREF(data)) || !isWidecExt(CHDEREF(data)))
+ {
+ result = x;
+ break;
+ }
+ --x;
+ }
+ return result;
+}
+
+/*
+ * Returns the number of columns needed for the given cell in a window.
+ */
+static int
+cell_width(WINDOW *win, int y, int x)
+{
+ int result = 1;
+
+ if (LEGALYX(win, y, x))
+ {
+ cchar_t *data = &(win->_line[y].text[x]);
+
+ if (isWidecExt(CHDEREF(data)))
+ {
+ /* recur, providing the number of columns to the next character */
+ result = cell_width(win, y, x - 1);
+ }
+ else
+ {
+ result = wcwidth(CharOf(CHDEREF(data)));
+ }
+ }
+ return result;
+}
+
+/*
+ * There is no wide-character function such as wdel_wch(), so we must find
+ * all of the cells that comprise a multi-column character and delete them
+ * one-by-one.
+ */
+static void
+delete_char(FORM *form)
+{
+ int cells = cell_width(form->w, form->currow, form->curcol);
+
+ form->curcol = cell_base(form->w, form->currow, form->curcol);
+ wmove(form->w, form->currow, form->curcol);
+ while (cells-- > 0)
+ {
+ wdelch(form->w);
+ }
+}
+#define DeleteChar(form) delete_char(form)
+#else
+#define DeleteChar(form) \
+ wmove((form)->w, (form)->currow, (form)->curcol), \
+ wdelch((form)->w)
+#endif
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static char *Get_Start_Of_Data(char * buf, int blen)
+|
+| Description : Return pointer to first non-blank position in buffer.
+| If buffer is empty return pointer to buffer itself.
+|
+| Return Values : Pointer to first non-blank position in buffer
++--------------------------------------------------------------------------*/
+NCURSES_INLINE static FIELD_CELL *
+Get_Start_Of_Data(FIELD_CELL *buf, int blen)
+{
+ FIELD_CELL *p = buf;
+ FIELD_CELL *end = &buf[blen];
+
+ assert(buf && blen >= 0);
+ while ((p < end) && ISBLANK(*p))
+ p++;
+ return ((p == end) ? buf : p);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static char *After_End_Of_Data(char * buf, int blen)
+|
+| Description : Return pointer after last non-blank position in buffer.
+| If buffer is empty, return pointer to buffer itself.
+|
+| Return Values : Pointer to position after last non-blank position in
+| buffer.
++--------------------------------------------------------------------------*/
+NCURSES_INLINE static FIELD_CELL *
+After_End_Of_Data(FIELD_CELL *buf, int blen)
+{
+ FIELD_CELL *p = &buf[blen];
+
+ assert(buf && blen >= 0);
+ while ((p > buf) && ISBLANK(p[-1]))
+ p--;
+ return (p);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static char *Get_First_Whitespace_Character(
+| char * buf, int blen)
+|
+| Description : Position to the first whitespace character.
+|
+| Return Values : Pointer to first whitespace character in buffer.
++--------------------------------------------------------------------------*/
+NCURSES_INLINE static FIELD_CELL *
+Get_First_Whitespace_Character(FIELD_CELL *buf, int blen)
+{
+ FIELD_CELL *p = buf;
+ FIELD_CELL *end = &p[blen];
+
+ assert(buf && blen >= 0);
+ while ((p < end) && !ISBLANK(*p))
+ p++;
+ return ((p == end) ? buf : p);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static char *After_Last_Whitespace_Character(
+| char * buf, int blen)
+|
+| Description : Get the position after the last whitespace character.
+|
+| Return Values : Pointer to position after last whitespace character in
+| buffer.
++--------------------------------------------------------------------------*/
+NCURSES_INLINE static FIELD_CELL *
+After_Last_Whitespace_Character(FIELD_CELL *buf, int blen)
+{
+ FIELD_CELL *p = &buf[blen];
+
+ assert(buf && blen >= 0);
+ while ((p > buf) && !ISBLANK(p[-1]))
+ p--;
+ return (p);
+}
+
+/* Set this to 1 to use the div_t version. This is a good idea if your
+ compiler has an intrinsic div() support. Unfortunately GNU-C has it
+ not yet.
+ N.B.: This only works if form->curcol follows immediately form->currow
+ and both are of type int.
+*/
+#define USE_DIV_T (0)
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static void Adjust_Cursor_Position(
+| FORM * form, const char * pos)
+|
+| Description : Set current row and column of the form to values
+| corresponding to the buffer position.
+|
+| Return Values : -
++--------------------------------------------------------------------------*/
+NCURSES_INLINE static void
+Adjust_Cursor_Position(FORM *form, const FIELD_CELL *pos)
+{
+ FIELD *field;
+ int idx;
+
+ field = form->current;
+ assert(pos >= field->buf && field->dcols > 0);
+ idx = (int)(pos - field->buf);
+#if USE_DIV_T
+ *((div_t *) & (form->currow)) = div(idx, field->dcols);
+#else
+ form->currow = idx / field->dcols;
+ form->curcol = idx - field->cols * form->currow;
+#endif
+ if (field->drows < form->currow)
+ form->currow = 0;
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static void Buffer_To_Window(
+| const FIELD * field,
+| WINDOW * win)
+|
+| Description : Copy the buffer to the window. If it is a multi-line
+| field, the buffer is split to the lines of the
+| window without any editing.
+|
+| Return Values : -
++--------------------------------------------------------------------------*/
+static void
+Buffer_To_Window(const FIELD *field, WINDOW *win)
+{
+ int width, height;
+ int y, x;
+ int len;
+ int row;
+ FIELD_CELL *pBuffer;
+
+ assert(win && field);
+
+ getyx(win, y, x);
+ width = getmaxx(win);
+ height = getmaxy(win);
+
+ for (row = 0, pBuffer = field->buf;
+ row < height;
+ row++, pBuffer += width)
+ {
+ if ((len = (int)(After_End_Of_Data(pBuffer, width) - pBuffer)) > 0)
+ {
+ wmove(win, row, 0);
+ myADDNSTR(win, pBuffer, len);
+ }
+ }
+ wmove(win, y, x);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static void Window_To_Buffer(
+| WINDOW * win,
+| FIELD * field)
+|
+| Description : Copy the content of the window into the buffer.
+| The multiple lines of a window are simply
+| concatenated into the buffer. Pad characters in
+| the window will be replaced by blanks in the buffer.
+|
+| Return Values : -
++--------------------------------------------------------------------------*/
+static void
+Window_To_Buffer(WINDOW *win, FIELD *field)
+{
+ int pad;
+ int len = 0;
+ FIELD_CELL *p;
+ int row, height;
+
+ assert(win && field && field->buf);
+
+ pad = field->pad;
+ p = field->buf;
+ height = getmaxy(win);
+
+ for (row = 0; (row < height) && (row < field->drows); row++)
+ {
+ wmove(win, row, 0);
+ len += myINNSTR(win, p + len, field->dcols);
+ }
+ p[len] = myZEROS;
+
+ /* replace visual padding character by blanks in buffer */
+ if (pad != C_BLANK)
+ {
+ int i;
+
+ for (i = 0; i < len; i++, p++)
+ {
+ if ((unsigned long)CharOf(*p) == ChCharOf(pad)
+#if USE_WIDEC_SUPPORT
+ && p->chars[1] == 0
+#endif
+ )
+ *p = myBLANK;
+ }
+ }
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static void Synchronize_Buffer(FORM * form)
+|
+| Description : If there was a change, copy the content of the
+| window into the buffer, so the buffer is synchronized
+| with the windows content. We have to indicate that the
+| buffer needs validation due to the change.
+|
+| Return Values : -
++--------------------------------------------------------------------------*/
+NCURSES_INLINE static void
+Synchronize_Buffer(FORM *form)
+{
+ if (form->status & _WINDOW_MODIFIED)
+ {
+ form->status &= ~_WINDOW_MODIFIED;
+ form->status |= _FCHECK_REQUIRED;
+ Window_To_Buffer(form->w, form->current);
+ wmove(form->w, form->currow, form->curcol);
+ }
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static bool Field_Grown( FIELD *field, int amount)
+|
+| Description : This function is called for growable dynamic fields
+| only. It has to increase the buffers and to allocate
+| a new window for this field.
+| This function has the side effect to set a new
+| field-buffer pointer, the dcols and drows values
+| as well as a new current Window for the field.
+|
+| Return Values : TRUE - field successfully increased
+| FALSE - there was some error
++--------------------------------------------------------------------------*/
+static bool
+Field_Grown(FIELD *field, int amount)
+{
+ bool result = FALSE;
+
+ if (field && Growable(field))
+ {
+ bool single_line_field = Single_Line_Field(field);
+ int old_buflen = Buffer_Length(field);
+ int new_buflen;
+ int old_dcols = field->dcols;
+ int old_drows = field->drows;
+ FIELD_CELL *oldbuf = field->buf;
+ FIELD_CELL *newbuf;
+
+ int growth;
+ FORM *form = field->form;
+ bool need_visual_update = ((form != (FORM *)0) &&
+ (form->status & _POSTED) &&
+ (form->current == field));
+
+ if (need_visual_update)
+ Synchronize_Buffer(form);
+
+ if (single_line_field)
+ {
+ growth = field->cols * amount;
+ if (field->maxgrow)
+ growth = Minimum(field->maxgrow - field->dcols, growth);
+ field->dcols += growth;
+ if (field->dcols == field->maxgrow)
+ field->status &= ~_MAY_GROW;
+ }
+ else
+ {
+ growth = (field->rows + field->nrow) * amount;
+ if (field->maxgrow)
+ growth = Minimum(field->maxgrow - field->drows, growth);
+ field->drows += growth;
+ if (field->drows == field->maxgrow)
+ field->status &= ~_MAY_GROW;
+ }
+ /* drows, dcols changed, so we get really the new buffer length */
+ new_buflen = Buffer_Length(field);
+ newbuf = (FIELD_CELL *)malloc(Total_Buffer_Size(field));
+ if (!newbuf)
+ {
+ /* restore to previous state */
+ field->dcols = old_dcols;
+ field->drows = old_drows;
+ if ((single_line_field && (field->dcols != field->maxgrow)) ||
+ (!single_line_field && (field->drows != field->maxgrow)))
+ field->status |= _MAY_GROW;
+ }
+ else
+ {
+ /* Copy all the buffers. This is the reason why we can't just use
+ * realloc().
+ */
+ int i, j;
+ FIELD_CELL *old_bp;
+ FIELD_CELL *new_bp;
+
+ result = TRUE; /* allow sharing of recovery on failure */
+
+ T((T_CREATE("fieldcell %p"), newbuf));
+ field->buf = newbuf;
+ for (i = 0; i <= field->nbuf; i++)
+ {
+ new_bp = Address_Of_Nth_Buffer(field, i);
+ old_bp = oldbuf + i * (1 + old_buflen);
+ for (j = 0; j < old_buflen; ++j)
+ new_bp[j] = old_bp[j];
+ while (j < new_buflen)
+ new_bp[j++] = myBLANK;
+ new_bp[new_buflen] = myZEROS;
+ }
+
+#if USE_WIDEC_SUPPORT && NCURSES_EXT_FUNCS
+ if (wresize(field->working, 1, Buffer_Length(field) + 1) == ERR)
+ result = FALSE;
+#endif
+
+ if (need_visual_update && result)
+ {
+ WINDOW *new_window = newpad(field->drows, field->dcols);
+
+ if (new_window != 0)
+ {
+ assert(form != (FORM *)0);
+ if (form->w)
+ delwin(form->w);
+ form->w = new_window;
+ Set_Field_Window_Attributes(field, form->w);
+ werase(form->w);
+ Buffer_To_Window(field, form->w);
+ untouchwin(form->w);
+ wmove(form->w, form->currow, form->curcol);
+ }
+ else
+ result = FALSE;
+ }
+
+ if (result)
+ {
+ free(oldbuf);
+ /* reflect changes in linked fields */
+ if (field != field->link)
+ {
+ FIELD *linked_field;
+
+ for (linked_field = field->link;
+ linked_field != field;
+ linked_field = linked_field->link)
+ {
+ linked_field->buf = field->buf;
+ linked_field->drows = field->drows;
+ linked_field->dcols = field->dcols;
+ }
+ }
+ }
+ else
+ {
+ /* restore old state */
+ field->dcols = old_dcols;
+ field->drows = old_drows;
+ field->buf = oldbuf;
+ if ((single_line_field &&
+ (field->dcols != field->maxgrow)) ||
+ (!single_line_field &&
+ (field->drows != field->maxgrow)))
+ field->status |= _MAY_GROW;
+ free(newbuf);
+ }
+ }
+ }
+ return (result);
+}
+
+#ifdef NCURSES_MOUSE_VERSION
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : int Field_encloses(FIELD *field, int ry, int rx)
+|
+| Description : Check if the given coordinates lie within the given field.
+|
+| Return Values : E_OK - success
+| E_BAD_ARGUMENT - invalid form pointer
+| E_SYSTEM_ERROR - form has no current field or
+| field-window
++--------------------------------------------------------------------------*/
+static int
+Field_encloses(FIELD *field, int ry, int rx)
+{
+ T((T_CALLED("Field_encloses(%p)"), field));
+ if (field != 0
+ && field->frow <= ry
+ && (field->frow + field->rows) > ry
+ && field->fcol <= rx
+ && (field->fcol + field->cols) > rx)
+ {
+ RETURN(E_OK);
+ }
+ RETURN(E_INVALID_FIELD);
+}
+#endif
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : int _nc_Position_Form_Cursor(FORM * form)
+|
+| Description : Position the cursor in the window for the current
+| field to be in sync. with the currow and curcol
+| values.
+|
+| Return Values : E_OK - success
+| E_BAD_ARGUMENT - invalid form pointer
+| E_SYSTEM_ERROR - form has no current field or
+| field-window
++--------------------------------------------------------------------------*/
+NCURSES_EXPORT(int)
+_nc_Position_Form_Cursor(FORM *form)
+{
+ FIELD *field;
+ WINDOW *formwin;
+
+ if (!form)
+ return (E_BAD_ARGUMENT);
+
+ if (!form->w || !form->current)
+ return (E_SYSTEM_ERROR);
+
+ field = form->current;
+ formwin = Get_Form_Window(form);
+
+ wmove(form->w, form->currow, form->curcol);
+ if (Has_Invisible_Parts(field))
+ {
+ /* in this case fieldwin isn't derived from formwin, so we have
+ to move the cursor in formwin by hand... */
+ wmove(formwin,
+ field->frow + form->currow - form->toprow,
+ field->fcol + form->curcol - form->begincol);
+ wcursyncup(formwin);
+ }
+ else
+ wcursyncup(form->w);
+ return (E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : int _nc_Refresh_Current_Field(FORM * form)
+|
+| Description : Propagate the changes in the fields window to the
+| window of the form.
+|
+| Return Values : E_OK - on success
+| E_BAD_ARGUMENT - invalid form pointer
+| E_SYSTEM_ERROR - general error
++--------------------------------------------------------------------------*/
+NCURSES_EXPORT(int)
+_nc_Refresh_Current_Field(FORM *form)
+{
+ WINDOW *formwin;
+ FIELD *field;
+
+ T((T_CALLED("_nc_Refresh_Current_Field(%p)"), form));
+
+ if (!form)
+ RETURN(E_BAD_ARGUMENT);
+
+ if (!form->w || !form->current)
+ RETURN(E_SYSTEM_ERROR);
+
+ field = form->current;
+ formwin = Get_Form_Window(form);
+
+ if (field->opts & O_PUBLIC)
+ {
+ if (Is_Scroll_Field(field))
+ {
+ /* Again, in this case the fieldwin isn't derived from formwin,
+ so we have to perform a copy operation. */
+ if (Single_Line_Field(field))
+ {
+ /* horizontal scrolling */
+ if (form->curcol < form->begincol)
+ form->begincol = form->curcol;
+ else
+ {
+ if (form->curcol >= (form->begincol + field->cols))
+ form->begincol = form->curcol - field->cols + 1;
+ }
+ copywin(form->w,
+ formwin,
+ 0,
+ form->begincol,
+ field->frow,
+ field->fcol,
+ field->frow,
+ field->cols + field->fcol - 1,
+ 0);
+ }
+ else
+ {
+ /* A multi-line, i.e. vertical scrolling field */
+ int row_after_bottom, first_modified_row, first_unmodified_row;
+
+ if (field->drows > field->rows)
+ {
+ row_after_bottom = form->toprow + field->rows;
+ if (form->currow < form->toprow)
+ {
+ form->toprow = form->currow;
+ field->status |= _NEWTOP;
+ }
+ if (form->currow >= row_after_bottom)
+ {
+ form->toprow = form->currow - field->rows + 1;
+ field->status |= _NEWTOP;
+ }
+ if (field->status & _NEWTOP)
+ {
+ /* means we have to copy whole range */
+ first_modified_row = form->toprow;
+ first_unmodified_row = first_modified_row + field->rows;
+ field->status &= ~_NEWTOP;
+ }
+ else
+ {
+ /* we try to optimize : finding the range of touched
+ lines */
+ first_modified_row = form->toprow;
+ while (first_modified_row < row_after_bottom)
+ {
+ if (is_linetouched(form->w, first_modified_row))
+ break;
+ first_modified_row++;
+ }
+ first_unmodified_row = first_modified_row;
+ while (first_unmodified_row < row_after_bottom)
+ {
+ if (!is_linetouched(form->w, first_unmodified_row))
+ break;
+ first_unmodified_row++;
+ }
+ }
+ }
+ else
+ {
+ first_modified_row = form->toprow;
+ first_unmodified_row = first_modified_row + field->rows;
+ }
+ if (first_unmodified_row != first_modified_row)
+ copywin(form->w,
+ formwin,
+ first_modified_row,
+ 0,
+ field->frow + first_modified_row - form->toprow,
+ field->fcol,
+ field->frow + first_unmodified_row - form->toprow - 1,
+ field->cols + field->fcol - 1,
+ 0);
+ }
+ wsyncup(formwin);
+ }
+ else
+ {
+ /* if the field-window is simply a derived window, i.e. contains no
+ * invisible parts, the whole thing is trivial
+ */
+ wsyncup(form->w);
+ }
+ }
+ untouchwin(form->w);
+ returnCode(_nc_Position_Form_Cursor(form));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static void Perform_Justification(
+| FIELD * field,
+| WINDOW * win)
+|
+| Description : Output field with requested justification
+|
+| Return Values : -
++--------------------------------------------------------------------------*/
+static void
+Perform_Justification(FIELD *field, WINDOW *win)
+{
+ FIELD_CELL *bp;
+ int len;
+ int col = 0;
+
+ bp = Get_Start_Of_Data(field->buf, Buffer_Length(field));
+ len = (int)(After_End_Of_Data(field->buf, Buffer_Length(field)) - bp);
+
+ if (len > 0)
+ {
+ assert(win && (field->drows == 1) && (field->dcols == field->cols));
+
+ switch (field->just)
+ {
+ case JUSTIFY_LEFT:
+ break;
+ case JUSTIFY_CENTER:
+ col = (field->cols - len) / 2;
+ break;
+ case JUSTIFY_RIGHT:
+ col = field->cols - len;
+ break;
+ default:
+ break;
+ }
+
+ wmove(win, 0, col);
+ myADDNSTR(win, bp, len);
+ }
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static void Undo_Justification(
+| FIELD * field,
+| WINDOW * win)
+|
+| Description : Display field without any justification, i.e.
+| left justified
+|
+| Return Values : -
++--------------------------------------------------------------------------*/
+static void
+Undo_Justification(FIELD *field, WINDOW *win)
+{
+ FIELD_CELL *bp;
+ int len;
+
+ bp = Get_Start_Of_Data(field->buf, Buffer_Length(field));
+ len = (int)(After_End_Of_Data(field->buf, Buffer_Length(field)) - bp);
+
+ if (len > 0)
+ {
+ assert(win);
+ wmove(win, 0, 0);
+ myADDNSTR(win, bp, len);
+ }
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static bool Check_Char(
+| FIELDTYPE * typ,
+| int ch,
+| TypeArgument *argp)
+|
+| Description : Perform a single character check for character ch
+| according to the fieldtype instance.
+|
+| Return Values : TRUE - Character is valid
+| FALSE - Character is invalid
++--------------------------------------------------------------------------*/
+static bool
+Check_Char(FIELDTYPE *typ, int ch, TypeArgument *argp)
+{
+ if (typ)
+ {
+ if (typ->status & _LINKED_TYPE)
+ {
+ assert(argp);
+ return (
+ Check_Char(typ->left, ch, argp->left) ||
+ Check_Char(typ->right, ch, argp->right));
+ }
+ else
+ {
+ if (typ->ccheck)
+ return typ->ccheck(ch, (void *)argp);
+ }
+ }
+ return (!iscntrl(UChar(ch)) ? TRUE : FALSE);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int Display_Or_Erase_Field(
+| FIELD * field,
+| bool bEraseFlag)
+|
+| Description : Create a subwindow for the field and display the
+| buffer contents (apply justification if required)
+| or simply erase the field.
+|
+| Return Values : E_OK - on success
+| E_SYSTEM_ERROR - some error (typical no memory)
++--------------------------------------------------------------------------*/
+static int
+Display_Or_Erase_Field(FIELD *field, bool bEraseFlag)
+{
+ WINDOW *win;
+ WINDOW *fwin;
+
+ if (!field)
+ return E_SYSTEM_ERROR;
+
+ fwin = Get_Form_Window(field->form);
+ win = derwin(fwin,
+ field->rows, field->cols, field->frow, field->fcol);
+
+ if (!win)
+ return E_SYSTEM_ERROR;
+ else
+ {
+ if (field->opts & O_VISIBLE)
+ Set_Field_Window_Attributes(field, win);
+ else
+ wattrset(win, WINDOW_ATTRS(fwin));
+ werase(win);
+ }
+
+ if (!bEraseFlag)
+ {
+ if (field->opts & O_PUBLIC)
+ {
+ if (Justification_Allowed(field))
+ Perform_Justification(field, win);
+ else
+ Buffer_To_Window(field, win);
+ }
+ field->status &= ~_NEWTOP;
+ }
+ wsyncup(win);
+ delwin(win);
+ return E_OK;
+}
+
+/* Macros to preset the bEraseFlag */
+#define Display_Field(field) Display_Or_Erase_Field(field,FALSE)
+#define Erase_Field(field) Display_Or_Erase_Field(field,TRUE)
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int Synchronize_Field(FIELD * field)
+|
+| Description : Synchronize the windows content with the value in
+| the buffer.
+|
+| Return Values : E_OK - success
+| E_BAD_ARGUMENT - invalid field pointer
+| E_SYSTEM_ERROR - some severe basic error
++--------------------------------------------------------------------------*/
+static int
+Synchronize_Field(FIELD *field)
+{
+ FORM *form;
+ int res = E_OK;
+
+ if (!field)
+ return (E_BAD_ARGUMENT);
+
+ if (((form = field->form) != (FORM *)0)
+ && Field_Really_Appears(field))
+ {
+ if (field == form->current)
+ {
+ form->currow = form->curcol = form->toprow = form->begincol = 0;
+ werase(form->w);
+
+ if ((field->opts & O_PUBLIC) && Justification_Allowed(field))
+ Undo_Justification(field, form->w);
+ else
+ Buffer_To_Window(field, form->w);
+
+ field->status |= _NEWTOP;
+ res = _nc_Refresh_Current_Field(form);
+ }
+ else
+ res = Display_Field(field);
+ }
+ field->status |= _CHANGED;
+ return (res);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int Synchronize_Linked_Fields(FIELD * field)
+|
+| Description : Propagate the Synchronize_Field function to all linked
+| fields. The first error that occurs in the sequence
+| of updates is the return value.
+|
+| Return Values : E_OK - success
+| E_BAD_ARGUMENT - invalid field pointer
+| E_SYSTEM_ERROR - some severe basic error
++--------------------------------------------------------------------------*/
+static int
+Synchronize_Linked_Fields(FIELD *field)
+{
+ FIELD *linked_field;
+ int res = E_OK;
+ int syncres;
+
+ if (!field)
+ return (E_BAD_ARGUMENT);
+
+ if (!field->link)
+ return (E_SYSTEM_ERROR);
+
+ for (linked_field = field->link;
+ linked_field != field;
+ linked_field = linked_field->link)
+ {
+ if (((syncres = Synchronize_Field(linked_field)) != E_OK) &&
+ (res == E_OK))
+ res = syncres;
+ }
+ return (res);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : int _nc_Synchronize_Attributes(FIELD * field)
+|
+| Description : If a fields visual attributes have changed, this
+| routine is called to propagate those changes to the
+| screen.
+|
+| Return Values : E_OK - success
+| E_BAD_ARGUMENT - invalid field pointer
+| E_SYSTEM_ERROR - some severe basic error
++--------------------------------------------------------------------------*/
+NCURSES_EXPORT(int)
+_nc_Synchronize_Attributes(FIELD *field)
+{
+ FORM *form;
+ int res = E_OK;
+ WINDOW *formwin;
+
+ T((T_CALLED("_nc_Synchronize_Attributes(%p)"), field));
+
+ if (!field)
+ returnCode(E_BAD_ARGUMENT);
+
+ CHECKPOS(field->form);
+ if (((form = field->form) != (FORM *)0)
+ && Field_Really_Appears(field))
+ {
+ if (form->current == field)
+ {
+ Synchronize_Buffer(form);
+ Set_Field_Window_Attributes(field, form->w);
+ werase(form->w);
+ wmove(form->w, form->currow, form->curcol);
+
+ if (field->opts & O_PUBLIC)
+ {
+ if (Justification_Allowed(field))
+ Undo_Justification(field, form->w);
+ else
+ Buffer_To_Window(field, form->w);
+ }
+ else
+ {
+ formwin = Get_Form_Window(form);
+ copywin(form->w, formwin,
+ 0, 0,
+ field->frow, field->fcol,
+ field->rows - 1, field->cols - 1, 0);
+ wsyncup(formwin);
+ Buffer_To_Window(field, form->w);
+ field->status |= _NEWTOP; /* fake refresh to paint all */
+ _nc_Refresh_Current_Field(form);
+ }
+ }
+ else
+ {
+ res = Display_Field(field);
+ }
+ }
+ CHECKPOS(form);
+ returnCode(res);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : int _nc_Synchronize_Options(FIELD * field,
+| Field_Options newopts)
+|
+| Description : If a fields options have changed, this routine is
+| called to propagate these changes to the screen and
+| to really change the behavior of the field.
+|
+| Return Values : E_OK - success
+| E_BAD_ARGUMENT - invalid field pointer
+| E_CURRENT - field is the current one
+| E_SYSTEM_ERROR - some severe basic error
++--------------------------------------------------------------------------*/
+NCURSES_EXPORT(int)
+_nc_Synchronize_Options(FIELD *field, Field_Options newopts)
+{
+ Field_Options oldopts;
+ Field_Options changed_opts;
+ FORM *form;
+ int res = E_OK;
+
+ T((T_CALLED("_nc_Synchronize_Options(%p,%#x)"), field, newopts));
+
+ if (!field)
+ returnCode(E_BAD_ARGUMENT);
+
+ oldopts = field->opts;
+ changed_opts = oldopts ^ newopts;
+ field->opts = newopts;
+ form = field->form;
+
+ if (form)
+ {
+ if (form->current == field)
+ {
+ field->opts = oldopts;
+ returnCode(E_CURRENT);
+ }
+
+ if (form->status & _POSTED)
+ {
+ if ((form->curpage == field->page))
+ {
+ if (changed_opts & O_VISIBLE)
+ {
+ if (newopts & O_VISIBLE)
+ res = Display_Field(field);
+ else
+ res = Erase_Field(field);
+ }
+ else
+ {
+ if ((changed_opts & O_PUBLIC) &&
+ (newopts & O_VISIBLE))
+ res = Display_Field(field);
+ }
+ }
+ }
+ }
+
+ if (changed_opts & O_STATIC)
+ {
+ bool single_line_field = Single_Line_Field(field);
+ int res2 = E_OK;
+
+ if (newopts & O_STATIC)
+ {
+ /* the field becomes now static */
+ field->status &= ~_MAY_GROW;
+ /* if actually we have no hidden columns, justification may
+ occur again */
+ if (single_line_field &&
+ (field->cols == field->dcols) &&
+ (field->just != NO_JUSTIFICATION) &&
+ Field_Really_Appears(field))
+ {
+ res2 = Display_Field(field);
+ }
+ }
+ else
+ {
+ /* field is no longer static */
+ if ((field->maxgrow == 0) ||
+ (single_line_field && (field->dcols < field->maxgrow)) ||
+ (!single_line_field && (field->drows < field->maxgrow)))
+ {
+ field->status |= _MAY_GROW;
+ /* a field with justification now changes its behavior,
+ so we must redisplay it */
+ if (single_line_field &&
+ (field->just != NO_JUSTIFICATION) &&
+ Field_Really_Appears(field))
+ {
+ res2 = Display_Field(field);
+ }
+ }
+ }
+ if (res2 != E_OK)
+ res = res2;
+ }
+
+ returnCode(res);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : int _nc_Set_Current_Field(FORM * form,
+| FIELD * newfield)
+|
+| Description : Make the newfield the new current field.
+|
+| Return Values : E_OK - success
+| E_BAD_ARGUMENT - invalid form or field pointer
+| E_SYSTEM_ERROR - some severe basic error
+| E_NOT_CONNECTED - no fields are connected to the form
++--------------------------------------------------------------------------*/
+NCURSES_EXPORT(int)
+_nc_Set_Current_Field(FORM *form, FIELD *newfield)
+{
+ FIELD *field;
+ WINDOW *new_window;
+
+ T((T_CALLED("_nc_Set_Current_Field(%p,%p)"), form, newfield));
+
+ if (!form || !newfield || !form->current || (newfield->form != form))
+ returnCode(E_BAD_ARGUMENT);
+
+ if ((form->status & _IN_DRIVER))
+ returnCode(E_BAD_STATE);
+
+ if (!(form->field))
+ returnCode(E_NOT_CONNECTED);
+
+ field = form->current;
+
+ if ((field != newfield) ||
+ !(form->status & _POSTED))
+ {
+ if ((form->w) &&
+ (field->opts & O_VISIBLE) &&
+ (field->form->curpage == field->page))
+ {
+ _nc_Refresh_Current_Field(form);
+ if (field->opts & O_PUBLIC)
+ {
+ if (field->drows > field->rows)
+ {
+ if (form->toprow == 0)
+ field->status &= ~_NEWTOP;
+ else
+ field->status |= _NEWTOP;
+ }
+ else
+ {
+ if (Justification_Allowed(field))
+ {
+ Window_To_Buffer(form->w, field);
+ werase(form->w);
+ Perform_Justification(field, form->w);
+ wsyncup(form->w);
+ }
+ }
+ }
+ delwin(form->w);
+ form->w = (WINDOW *)0;
+ }
+
+ field = newfield;
+
+ if (Has_Invisible_Parts(field))
+ new_window = newpad(field->drows, field->dcols);
+ else
+ new_window = derwin(Get_Form_Window(form),
+ field->rows, field->cols, field->frow, field->fcol);
+
+ if (!new_window)
+ returnCode(E_SYSTEM_ERROR);
+
+ form->current = field;
+
+ if (form->w)
+ delwin(form->w);
+ form->w = new_window;
+
+ form->status &= ~_WINDOW_MODIFIED;
+ Set_Field_Window_Attributes(field, form->w);
+
+ if (Has_Invisible_Parts(field))
+ {
+ werase(form->w);
+ Buffer_To_Window(field, form->w);
+ }
+ else
+ {
+ if (Justification_Allowed(field))
+ {
+ werase(form->w);
+ Undo_Justification(field, form->w);
+ wsyncup(form->w);
+ }
+ }
+
+ untouchwin(form->w);
+ }
+
+ form->currow = form->curcol = form->toprow = form->begincol = 0;
+ returnCode(E_OK);
+}
+
+/*----------------------------------------------------------------------------
+ Intra-Field Navigation routines
+ --------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int IFN_Next_Character(FORM * form)
+|
+| Description : Move to the next character in the field. In a multi-line
+| field this wraps at the end of the line.
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - at the rightmost position
++--------------------------------------------------------------------------*/
+static int
+IFN_Next_Character(FORM *form)
+{
+ FIELD *field = form->current;
+ int step = myWCWIDTH(form->w, form->currow, form->curcol);
+
+ T((T_CALLED("IFN_Next_Character(%p)"), form));
+ if ((form->curcol += step) == field->dcols)
+ {
+ if ((++(form->currow)) == field->drows)
+ {
+#if GROW_IF_NAVIGATE
+ if (!Single_Line_Field(field) && Field_Grown(field, 1))
+ {
+ form->curcol = 0;
+ returnCode(E_OK);
+ }
+#endif
+ form->currow--;
+#if GROW_IF_NAVIGATE
+ if (Single_Line_Field(field) && Field_Grown(field, 1))
+ returnCode(E_OK);
+#endif
+ form->curcol -= step;
+ returnCode(E_REQUEST_DENIED);
+ }
+ form->curcol = 0;
+ }
+ returnCode(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int IFN_Previous_Character(FORM * form)
+|
+| Description : Move to the previous character in the field. In a
+| multi-line field this wraps and the beginning of the
+| line.
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - at the leftmost position
++--------------------------------------------------------------------------*/
+static int
+IFN_Previous_Character(FORM *form)
+{
+ int amount = myWCWIDTH(form->w, form->currow, form->curcol - 1);
+ int oldcol = form->curcol;
+
+ T((T_CALLED("IFN_Previous_Character(%p)"), form));
+ if ((form->curcol -= amount) < 0)
+ {
+ if ((--(form->currow)) < 0)
+ {
+ form->currow++;
+ form->curcol = oldcol;
+ returnCode(E_REQUEST_DENIED);
+ }
+ form->curcol = form->current->dcols - 1;
+ }
+ returnCode(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int IFN_Next_Line(FORM * form)
+|
+| Description : Move to the beginning of the next line in the field
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - at the last line
++--------------------------------------------------------------------------*/
+static int
+IFN_Next_Line(FORM *form)
+{
+ FIELD *field = form->current;
+
+ T((T_CALLED("IFN_Next_Line(%p)"), form));
+ if ((++(form->currow)) == field->drows)
+ {
+#if GROW_IF_NAVIGATE
+ if (!Single_Line_Field(field) && Field_Grown(field, 1))
+ returnCode(E_OK);
+#endif
+ form->currow--;
+ returnCode(E_REQUEST_DENIED);
+ }
+ form->curcol = 0;
+ returnCode(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int IFN_Previous_Line(FORM * form)
+|
+| Description : Move to the beginning of the previous line in the field
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - at the first line
++--------------------------------------------------------------------------*/
+static int
+IFN_Previous_Line(FORM *form)
+{
+ T((T_CALLED("IFN_Previous_Line(%p)"), form));
+ if ((--(form->currow)) < 0)
+ {
+ form->currow++;
+ returnCode(E_REQUEST_DENIED);
+ }
+ form->curcol = 0;
+ returnCode(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int IFN_Next_Word(FORM * form)
+|
+| Description : Move to the beginning of the next word in the field.
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - there is no next word
++--------------------------------------------------------------------------*/
+static int
+IFN_Next_Word(FORM *form)
+{
+ FIELD *field = form->current;
+ FIELD_CELL *bp = Address_Of_Current_Position_In_Buffer(form);
+ FIELD_CELL *s;
+ FIELD_CELL *t;
+
+ T((T_CALLED("IFN_Next_Word(%p)"), form));
+
+ /* We really need access to the data, so we have to synchronize */
+ Synchronize_Buffer(form);
+
+ /* Go to the first whitespace after the current position (including
+ current position). This is then the starting point to look for the
+ next non-blank data */
+ s = Get_First_Whitespace_Character(bp, Buffer_Length(field) -
+ (int)(bp - field->buf));
+
+ /* Find the start of the next word */
+ t = Get_Start_Of_Data(s, Buffer_Length(field) -
+ (int)(s - field->buf));
+#if !FRIENDLY_PREV_NEXT_WORD
+ if (s == t)
+ returnCode(E_REQUEST_DENIED);
+ else
+#endif
+ {
+ Adjust_Cursor_Position(form, t);
+ returnCode(E_OK);
+ }
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int IFN_Previous_Word(FORM * form)
+|
+| Description : Move to the beginning of the previous word in the field.
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - there is no previous word
++--------------------------------------------------------------------------*/
+static int
+IFN_Previous_Word(FORM *form)
+{
+ FIELD *field = form->current;
+ FIELD_CELL *bp = Address_Of_Current_Position_In_Buffer(form);
+ FIELD_CELL *s;
+ FIELD_CELL *t;
+ bool again = FALSE;
+
+ T((T_CALLED("IFN_Previous_Word(%p)"), form));
+
+ /* We really need access to the data, so we have to synchronize */
+ Synchronize_Buffer(form);
+
+ s = After_End_Of_Data(field->buf, (int)(bp - field->buf));
+ /* s points now right after the last non-blank in the buffer before bp.
+ If bp was in a word, s equals bp. In this case we must find the last
+ whitespace in the buffer before bp and repeat the game to really find
+ the previous word! */
+ if (s == bp)
+ again = TRUE;
+
+ /* And next call now goes backward to look for the last whitespace
+ before that, pointing right after this, so it points to the begin
+ of the previous word.
+ */
+ t = After_Last_Whitespace_Character(field->buf, (int)(s - field->buf));
+#if !FRIENDLY_PREV_NEXT_WORD
+ if (s == t)
+ returnCode(E_REQUEST_DENIED);
+#endif
+ if (again)
+ {
+ /* and do it again, replacing bp by t */
+ s = After_End_Of_Data(field->buf, (int)(t - field->buf));
+ t = After_Last_Whitespace_Character(field->buf, (int)(s - field->buf));
+#if !FRIENDLY_PREV_NEXT_WORD
+ if (s == t)
+ returnCode(E_REQUEST_DENIED);
+#endif
+ }
+ Adjust_Cursor_Position(form, t);
+ returnCode(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int IFN_Beginning_Of_Field(FORM * form)
+|
+| Description : Place the cursor at the first non-pad character in
+| the field.
+|
+| Return Values : E_OK - success
++--------------------------------------------------------------------------*/
+static int
+IFN_Beginning_Of_Field(FORM *form)
+{
+ FIELD *field = form->current;
+
+ T((T_CALLED("IFN_Beginning_Of_Field(%p)"), form));
+ Synchronize_Buffer(form);
+ Adjust_Cursor_Position(form,
+ Get_Start_Of_Data(field->buf, Buffer_Length(field)));
+ returnCode(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int IFN_End_Of_Field(FORM * form)
+|
+| Description : Place the cursor after the last non-pad character in
+| the field. If the field occupies the last position in
+| the buffer, the cursor is positioned on the last
+| character.
+|
+| Return Values : E_OK - success
++--------------------------------------------------------------------------*/
+static int
+IFN_End_Of_Field(FORM *form)
+{
+ FIELD *field = form->current;
+ FIELD_CELL *pos;
+
+ T((T_CALLED("IFN_End_Of_Field(%p)"), form));
+ Synchronize_Buffer(form);
+ pos = After_End_Of_Data(field->buf, Buffer_Length(field));
+ if (pos == (field->buf + Buffer_Length(field)))
+ pos--;
+ Adjust_Cursor_Position(form, pos);
+ returnCode(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int IFN_Beginning_Of_Line(FORM * form)
+|
+| Description : Place the cursor on the first non-pad character in
+| the current line of the field.
+|
+| Return Values : E_OK - success
++--------------------------------------------------------------------------*/
+static int
+IFN_Beginning_Of_Line(FORM *form)
+{
+ FIELD *field = form->current;
+
+ T((T_CALLED("IFN_Beginning_Of_Line(%p)"), form));
+ Synchronize_Buffer(form);
+ Adjust_Cursor_Position(form,
+ Get_Start_Of_Data(Address_Of_Current_Row_In_Buffer(form),
+ field->dcols));
+ returnCode(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int IFN_End_Of_Line(FORM * form)
+|
+| Description : Place the cursor after the last non-pad character in the
+| current line of the field. If the field occupies the
+| last column in the line, the cursor is positioned on the
+| last character of the line.
+|
+| Return Values : E_OK - success
++--------------------------------------------------------------------------*/
+static int
+IFN_End_Of_Line(FORM *form)
+{
+ FIELD *field = form->current;
+ FIELD_CELL *pos;
+ FIELD_CELL *bp;
+
+ T((T_CALLED("IFN_End_Of_Line(%p)"), form));
+ Synchronize_Buffer(form);
+ bp = Address_Of_Current_Row_In_Buffer(form);
+ pos = After_End_Of_Data(bp, field->dcols);
+ if (pos == (bp + field->dcols))
+ pos--;
+ Adjust_Cursor_Position(form, pos);
+ returnCode(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int IFN_Left_Character(FORM * form)
+|
+| Description : Move one character to the left in the current line.
+| This doesn't cycle.
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - already in first column
++--------------------------------------------------------------------------*/
+static int
+IFN_Left_Character(FORM *form)
+{
+ int amount = myWCWIDTH(form->w, form->currow, form->curcol - 1);
+ int oldcol = form->curcol;
+
+ T((T_CALLED("IFN_Left_Character(%p)"), form));
+ if ((form->curcol -= amount) < 0)
+ {
+ form->curcol = oldcol;
+ returnCode(E_REQUEST_DENIED);
+ }
+ returnCode(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int IFN_Right_Character(FORM * form)
+|
+| Description : Move one character to the right in the current line.
+| This doesn't cycle.
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - already in last column
++--------------------------------------------------------------------------*/
+static int
+IFN_Right_Character(FORM *form)
+{
+ int amount = myWCWIDTH(form->w, form->currow, form->curcol);
+ int oldcol = form->curcol;
+
+ T((T_CALLED("IFN_Right_Character(%p)"), form));
+ if ((form->curcol += amount) >= form->current->dcols)
+ {
+#if GROW_IF_NAVIGATE
+ FIELD *field = form->current;
+
+ if (Single_Line_Field(field) && Field_Grown(field, 1))
+ returnCode(E_OK);
+#endif
+ form->curcol = oldcol;
+ returnCode(E_REQUEST_DENIED);
+ }
+ returnCode(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int IFN_Up_Character(FORM * form)
+|
+| Description : Move one line up. This doesn't cycle through the lines
+| of the field.
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - already in last column
++--------------------------------------------------------------------------*/
+static int
+IFN_Up_Character(FORM *form)
+{
+ T((T_CALLED("IFN_Up_Character(%p)"), form));
+ if ((--(form->currow)) < 0)
+ {
+ form->currow++;
+ returnCode(E_REQUEST_DENIED);
+ }
+ returnCode(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int IFN_Down_Character(FORM * form)
+|
+| Description : Move one line down. This doesn't cycle through the
+| lines of the field.
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - already in last column
++--------------------------------------------------------------------------*/
+static int
+IFN_Down_Character(FORM *form)
+{
+ FIELD *field = form->current;
+
+ T((T_CALLED("IFN_Down_Character(%p)"), form));
+ if ((++(form->currow)) == field->drows)
+ {
+#if GROW_IF_NAVIGATE
+ if (!Single_Line_Field(field) && Field_Grown(field, 1))
+ returnCode(E_OK);
+#endif
+ --(form->currow);
+ returnCode(E_REQUEST_DENIED);
+ }
+ returnCode(E_OK);
+}
+/*----------------------------------------------------------------------------
+ END of Intra-Field Navigation routines
+ --------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+ Vertical scrolling helper routines
+ --------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int VSC_Generic(FORM *form, int nlines)
+|
+| Description : Scroll multi-line field forward (nlines>0) or
+| backward (nlines<0) this many lines.
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - can't scroll
++--------------------------------------------------------------------------*/
+static int
+VSC_Generic(FORM *form, int nlines)
+{
+ FIELD *field = form->current;
+ int res = E_REQUEST_DENIED;
+ int rows_to_go = (nlines > 0 ? nlines : -nlines);
+
+ if (nlines > 0)
+ {
+ if ((rows_to_go + form->toprow) > (field->drows - field->rows))
+ rows_to_go = (field->drows - field->rows - form->toprow);
+
+ if (rows_to_go > 0)
+ {
+ form->currow += rows_to_go;
+ form->toprow += rows_to_go;
+ res = E_OK;
+ }
+ }
+ else
+ {
+ if (rows_to_go > form->toprow)
+ rows_to_go = form->toprow;
+
+ if (rows_to_go > 0)
+ {
+ form->currow -= rows_to_go;
+ form->toprow -= rows_to_go;
+ res = E_OK;
+ }
+ }
+ return (res);
+}
+/*----------------------------------------------------------------------------
+ End of Vertical scrolling helper routines
+ --------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+ Vertical scrolling routines
+ --------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int Vertical_Scrolling(
+| int (* const fct) (FORM *),
+| FORM * form)
+|
+| Description : Performs the generic vertical scrolling routines.
+| This has to check for a multi-line field and to set
+| the _NEWTOP flag if scrolling really occurred.
+|
+| Return Values : Propagated error code from low-level driver calls
++--------------------------------------------------------------------------*/
+static int
+Vertical_Scrolling(int (*const fct) (FORM *), FORM *form)
+{
+ int res = E_REQUEST_DENIED;
+
+ if (!Single_Line_Field(form->current))
+ {
+ res = fct(form);
+ if (res == E_OK)
+ form->current->status |= _NEWTOP;
+ }
+ return (res);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int VSC_Scroll_Line_Forward(FORM * form)
+|
+| Description : Scroll multi-line field forward a line
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - no data ahead
++--------------------------------------------------------------------------*/
+static int
+VSC_Scroll_Line_Forward(FORM *form)
+{
+ T((T_CALLED("VSC_Scroll_Line_Forward(%p)"), form));
+ returnCode(VSC_Generic(form, 1));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int VSC_Scroll_Line_Backward(FORM * form)
+|
+| Description : Scroll multi-line field backward a line
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - no data behind
++--------------------------------------------------------------------------*/
+static int
+VSC_Scroll_Line_Backward(FORM *form)
+{
+ T((T_CALLED("VSC_Scroll_Line_Backward(%p)"), form));
+ returnCode(VSC_Generic(form, -1));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int VSC_Scroll_Page_Forward(FORM * form)
+|
+| Description : Scroll a multi-line field forward a page
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - no data ahead
++--------------------------------------------------------------------------*/
+static int
+VSC_Scroll_Page_Forward(FORM *form)
+{
+ T((T_CALLED("VSC_Scroll_Page_Forward(%p)"), form));
+ returnCode(VSC_Generic(form, form->current->rows));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int VSC_Scroll_Half_Page_Forward(FORM * form)
+|
+| Description : Scroll a multi-line field forward half a page
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - no data ahead
++--------------------------------------------------------------------------*/
+static int
+VSC_Scroll_Half_Page_Forward(FORM *form)
+{
+ T((T_CALLED("VSC_Scroll_Half_Page_Forward(%p)"), form));
+ returnCode(VSC_Generic(form, (form->current->rows + 1) / 2));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int VSC_Scroll_Page_Backward(FORM * form)
+|
+| Description : Scroll a multi-line field backward a page
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - no data behind
++--------------------------------------------------------------------------*/
+static int
+VSC_Scroll_Page_Backward(FORM *form)
+{
+ T((T_CALLED("VSC_Scroll_Page_Backward(%p)"), form));
+ returnCode(VSC_Generic(form, -(form->current->rows)));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int VSC_Scroll_Half_Page_Backward(FORM * form)
+|
+| Description : Scroll a multi-line field backward half a page
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - no data behind
++--------------------------------------------------------------------------*/
+static int
+VSC_Scroll_Half_Page_Backward(FORM *form)
+{
+ T((T_CALLED("VSC_Scroll_Half_Page_Backward(%p)"), form));
+ returnCode(VSC_Generic(form, -((form->current->rows + 1) / 2)));
+}
+/*----------------------------------------------------------------------------
+ End of Vertical scrolling routines
+ --------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+ Horizontal scrolling helper routines
+ --------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int HSC_Generic(FORM *form, int ncolumns)
+|
+| Description : Scroll single-line field forward (ncolumns>0) or
+| backward (ncolumns<0) this many columns.
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - can't scroll
++--------------------------------------------------------------------------*/
+static int
+HSC_Generic(FORM *form, int ncolumns)
+{
+ FIELD *field = form->current;
+ int res = E_REQUEST_DENIED;
+ int cols_to_go = (ncolumns > 0 ? ncolumns : -ncolumns);
+
+ if (ncolumns > 0)
+ {
+ if ((cols_to_go + form->begincol) > (field->dcols - field->cols))
+ cols_to_go = field->dcols - field->cols - form->begincol;
+
+ if (cols_to_go > 0)
+ {
+ form->curcol += cols_to_go;
+ form->begincol += cols_to_go;
+ res = E_OK;
+ }
+ }
+ else
+ {
+ if (cols_to_go > form->begincol)
+ cols_to_go = form->begincol;
+
+ if (cols_to_go > 0)
+ {
+ form->curcol -= cols_to_go;
+ form->begincol -= cols_to_go;
+ res = E_OK;
+ }
+ }
+ return (res);
+}
+/*----------------------------------------------------------------------------
+ End of Horizontal scrolling helper routines
+ --------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+ Horizontal scrolling routines
+ --------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int Horizontal_Scrolling(
+| int (* const fct) (FORM *),
+| FORM * form)
+|
+| Description : Performs the generic horizontal scrolling routines.
+| This has to check for a single-line field.
+|
+| Return Values : Propagated error code from low-level driver calls
++--------------------------------------------------------------------------*/
+static int
+Horizontal_Scrolling(int (*const fct) (FORM *), FORM *form)
+{
+ if (Single_Line_Field(form->current))
+ return fct(form);
+ else
+ return (E_REQUEST_DENIED);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int HSC_Scroll_Char_Forward(FORM * form)
+|
+| Description : Scroll single-line field forward a character
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - no data ahead
++--------------------------------------------------------------------------*/
+static int
+HSC_Scroll_Char_Forward(FORM *form)
+{
+ T((T_CALLED("HSC_Scroll_Char_Forward(%p)"), form));
+ returnCode(HSC_Generic(form, 1));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int HSC_Scroll_Char_Backward(FORM * form)
+|
+| Description : Scroll single-line field backward a character
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - no data behind
++--------------------------------------------------------------------------*/
+static int
+HSC_Scroll_Char_Backward(FORM *form)
+{
+ T((T_CALLED("HSC_Scroll_Char_Backward(%p)"), form));
+ returnCode(HSC_Generic(form, -1));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int HSC_Horizontal_Line_Forward(FORM* form)
+|
+| Description : Scroll single-line field forward a line
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - no data ahead
++--------------------------------------------------------------------------*/
+static int
+HSC_Horizontal_Line_Forward(FORM *form)
+{
+ T((T_CALLED("HSC_Horizontal_Line_Forward(%p)"), form));
+ returnCode(HSC_Generic(form, form->current->cols));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int HSC_Horizontal_Half_Line_Forward(FORM* form)
+|
+| Description : Scroll single-line field forward half a line
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - no data ahead
++--------------------------------------------------------------------------*/
+static int
+HSC_Horizontal_Half_Line_Forward(FORM *form)
+{
+ T((T_CALLED("HSC_Horizontal_Half_Line_Forward(%p)"), form));
+ returnCode(HSC_Generic(form, (form->current->cols + 1) / 2));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int HSC_Horizontal_Line_Backward(FORM* form)
+|
+| Description : Scroll single-line field backward a line
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - no data behind
++--------------------------------------------------------------------------*/
+static int
+HSC_Horizontal_Line_Backward(FORM *form)
+{
+ T((T_CALLED("HSC_Horizontal_Line_Backward(%p)"), form));
+ returnCode(HSC_Generic(form, -(form->current->cols)));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int HSC_Horizontal_Half_Line_Backward(FORM* form)
+|
+| Description : Scroll single-line field backward half a line
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - no data behind
++--------------------------------------------------------------------------*/
+static int
+HSC_Horizontal_Half_Line_Backward(FORM *form)
+{
+ T((T_CALLED("HSC_Horizontal_Half_Line_Backward(%p)"), form));
+ returnCode(HSC_Generic(form, -((form->current->cols + 1) / 2)));
+}
+
+/*----------------------------------------------------------------------------
+ End of Horizontal scrolling routines
+ --------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+ Helper routines for Field Editing
+ --------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static bool Is_There_Room_For_A_Line(FORM * form)
+|
+| Description : Check whether or not there is enough room in the
+| buffer to enter a whole line.
+|
+| Return Values : TRUE - there is enough space
+| FALSE - there is not enough space
++--------------------------------------------------------------------------*/
+NCURSES_INLINE static bool
+Is_There_Room_For_A_Line(FORM *form)
+{
+ FIELD *field = form->current;
+ FIELD_CELL *begin_of_last_line, *s;
+
+ Synchronize_Buffer(form);
+ begin_of_last_line = Address_Of_Row_In_Buffer(field, (field->drows - 1));
+ s = After_End_Of_Data(begin_of_last_line, field->dcols);
+ return ((s == begin_of_last_line) ? TRUE : FALSE);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static bool Is_There_Room_For_A_Char_In_Line(FORM * form)
+|
+| Description : Checks whether or not there is room for a new character
+| in the current line.
+|
+| Return Values : TRUE - there is room
+| FALSE - there is not enough room (line full)
++--------------------------------------------------------------------------*/
+NCURSES_INLINE static bool
+Is_There_Room_For_A_Char_In_Line(FORM *form)
+{
+ int last_char_in_line;
+
+ wmove(form->w, form->currow, form->current->dcols - 1);
+ last_char_in_line = (int)(winch(form->w) & A_CHARTEXT);
+ wmove(form->w, form->currow, form->curcol);
+ return (((last_char_in_line == form->current->pad) ||
+ is_blank(last_char_in_line)) ? TRUE : FALSE);
+}
+
+#define There_Is_No_Room_For_A_Char_In_Line(f) \
+ !Is_There_Room_For_A_Char_In_Line(f)
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int Insert_String(
+| FORM * form,
+| int row,
+| char *txt,
+| int len )
+|
+| Description : Insert the 'len' characters beginning at pointer 'txt'
+| into the 'row' of the 'form'. The insertion occurs
+| on the beginning of the row, all other characters are
+| moved to the right. After the text a pad character will
+| be inserted to separate the text from the rest. If
+| necessary the insertion moves characters on the next
+| line to make place for the requested insertion string.
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED -
+| E_SYSTEM_ERROR - system error
++--------------------------------------------------------------------------*/
+static int
+Insert_String(FORM *form, int row, FIELD_CELL *txt, int len)
+{
+ FIELD *field = form->current;
+ FIELD_CELL *bp = Address_Of_Row_In_Buffer(field, row);
+ int datalen = (int)(After_End_Of_Data(bp, field->dcols) - bp);
+ int freelen = field->dcols - datalen;
+ int requiredlen = len + 1;
+ FIELD_CELL *split;
+ int result = E_REQUEST_DENIED;
+
+ if (freelen >= requiredlen)
+ {
+ wmove(form->w, row, 0);
+ myINSNSTR(form->w, txt, len);
+ wmove(form->w, row, len);
+ myINSNSTR(form->w, &myBLANK, 1);
+ return E_OK;
+ }
+ else
+ {
+ /* we have to move characters on the next line. If we are on the
+ last line this may work, if the field is growable */
+ if ((row == (field->drows - 1)) && Growable(field))
+ {
+ if (!Field_Grown(field, 1))
+ return (E_SYSTEM_ERROR);
+ /* !!!Side-Effect : might be changed due to growth!!! */
+ bp = Address_Of_Row_In_Buffer(field, row);
+ }
+
+ if (row < (field->drows - 1))
+ {
+ split =
+ After_Last_Whitespace_Character(bp,
+ (int)(Get_Start_Of_Data(bp
+ + field->dcols
+ - requiredlen,
+ requiredlen)
+ - bp));
+ /* split points now to the first character of the portion of the
+ line that must be moved to the next line */
+ datalen = (int)(split - bp); /* + freelen has to stay on this line */
+ freelen = field->dcols - (datalen + freelen); /* for the next line */
+
+ if ((result = Insert_String(form, row + 1, split, freelen)) == E_OK)
+ {
+ wmove(form->w, row, datalen);
+ wclrtoeol(form->w);
+ wmove(form->w, row, 0);
+ myINSNSTR(form->w, txt, len);
+ wmove(form->w, row, len);
+ myINSNSTR(form->w, &myBLANK, 1);
+ return E_OK;
+ }
+ }
+ return (result);
+ }
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int Wrapping_Not_Necessary_Or_Wrapping_Ok(
+| FORM * form)
+|
+| Description : If a character has been entered into a field, it may
+| be that wrapping has to occur. This routine checks
+| whether or not wrapping is required and if so, performs
+| the wrapping.
+|
+| Return Values : E_OK - no wrapping required or wrapping
+| was successful
+| E_REQUEST_DENIED -
+| E_SYSTEM_ERROR - some system error
++--------------------------------------------------------------------------*/
+static int
+Wrapping_Not_Necessary_Or_Wrapping_Ok(FORM *form)
+{
+ FIELD *field = form->current;
+ int result = E_REQUEST_DENIED;
+ bool Last_Row = ((field->drows - 1) == form->currow);
+
+ if ((field->opts & O_WRAP) && /* wrapping wanted */
+ (!Single_Line_Field(field)) && /* must be multi-line */
+ (There_Is_No_Room_For_A_Char_In_Line(form)) && /* line is full */
+ (!Last_Row || Growable(field))) /* there are more lines */
+ {
+ FIELD_CELL *bp;
+ FIELD_CELL *split;
+ int chars_to_be_wrapped;
+ int chars_to_remain_on_line;
+
+ if (Last_Row)
+ {
+ /* the above logic already ensures, that in this case the field
+ is growable */
+ if (!Field_Grown(field, 1))
+ return E_SYSTEM_ERROR;
+ }
+ bp = Address_Of_Current_Row_In_Buffer(form);
+ Window_To_Buffer(form->w, field);
+ split = After_Last_Whitespace_Character(bp, field->dcols);
+ /* split points to the first character of the sequence to be brought
+ on the next line */
+ chars_to_remain_on_line = (int)(split - bp);
+ chars_to_be_wrapped = field->dcols - chars_to_remain_on_line;
+ if (chars_to_remain_on_line > 0)
+ {
+ if ((result = Insert_String(form, form->currow + 1, split,
+ chars_to_be_wrapped)) == E_OK)
+ {
+ wmove(form->w, form->currow, chars_to_remain_on_line);
+ wclrtoeol(form->w);
+ if (form->curcol >= chars_to_remain_on_line)
+ {
+ form->currow++;
+ form->curcol -= chars_to_remain_on_line;
+ }
+ return E_OK;
+ }
+ }
+ else
+ return E_OK;
+ if (result != E_OK)
+ {
+ DeleteChar(form);
+ Window_To_Buffer(form->w, field);
+ result = E_REQUEST_DENIED;
+ }
+ }
+ else
+ result = E_OK; /* wrapping was not necessary */
+ return (result);
+}
+
+/*----------------------------------------------------------------------------
+ Field Editing routines
+ --------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int Field_Editing(
+| int (* const fct) (FORM *),
+| FORM * form)
+|
+| Description : Generic routine for field editing requests. The driver
+| routines are only called for editable fields, the
+| _WINDOW_MODIFIED flag is set if editing occurred.
+| This is somewhat special due to the overload semantics
+| of the NEW_LINE and DEL_PREV requests.
+|
+| Return Values : Error code from low level drivers.
++--------------------------------------------------------------------------*/
+static int
+Field_Editing(int (*const fct) (FORM *), FORM *form)
+{
+ int res = E_REQUEST_DENIED;
+
+ /* We have to deal here with the specific case of the overloaded
+ behavior of New_Line and Delete_Previous requests.
+ They may end up in navigational requests if we are on the first
+ character in a field. But navigation is also allowed on non-
+ editable fields.
+ */
+ if ((fct == FE_Delete_Previous) &&
+ (form->opts & O_BS_OVERLOAD) &&
+ First_Position_In_Current_Field(form))
+ {
+ res = Inter_Field_Navigation(FN_Previous_Field, form);
+ }
+ else
+ {
+ if (fct == FE_New_Line)
+ {
+ if ((form->opts & O_NL_OVERLOAD) &&
+ First_Position_In_Current_Field(form))
+ {
+ res = Inter_Field_Navigation(FN_Next_Field, form);
+ }
+ else
+ /* FE_New_Line deals itself with the _WINDOW_MODIFIED flag */
+ res = fct(form);
+ }
+ else
+ {
+ /* From now on, everything must be editable */
+ if (form->current->opts & O_EDIT)
+ {
+ res = fct(form);
+ if (res == E_OK)
+ form->status |= _WINDOW_MODIFIED;
+ }
+ }
+ }
+ return res;
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FE_New_Line(FORM * form)
+|
+| Description : Perform a new line request. This is rather complex
+| compared to other routines in this code due to the
+| rather difficult to understand description in the
+| manuals.
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - new line not allowed
+| E_SYSTEM_ERROR - system error
++--------------------------------------------------------------------------*/
+static int
+FE_New_Line(FORM *form)
+{
+ FIELD *field = form->current;
+ FIELD_CELL *bp, *t;
+ bool Last_Row = ((field->drows - 1) == form->currow);
+
+ T((T_CALLED("FE_New_Line(%p)"), form));
+ if (form->status & _OVLMODE)
+ {
+ if (Last_Row &&
+ (!(Growable(field) && !Single_Line_Field(field))))
+ {
+ if (!(form->opts & O_NL_OVERLOAD))
+ returnCode(E_REQUEST_DENIED);
+ wmove(form->w, form->currow, form->curcol);
+ wclrtoeol(form->w);
+ /* we have to set this here, although it is also
+ handled in the generic routine. The reason is,
+ that FN_Next_Field may fail, but the form is
+ definitively changed */
+ form->status |= _WINDOW_MODIFIED;
+ returnCode(Inter_Field_Navigation(FN_Next_Field, form));
+ }
+ else
+ {
+ if (Last_Row && !Field_Grown(field, 1))
+ {
+ /* N.B.: due to the logic in the 'if', LastRow==TRUE
+ means here that the field is growable and not
+ a single-line field */
+ returnCode(E_SYSTEM_ERROR);
+ }
+ wmove(form->w, form->currow, form->curcol);
+ wclrtoeol(form->w);
+ form->currow++;
+ form->curcol = 0;
+ form->status |= _WINDOW_MODIFIED;
+ returnCode(E_OK);
+ }
+ }
+ else
+ {
+ /* Insert Mode */
+ if (Last_Row &&
+ !(Growable(field) && !Single_Line_Field(field)))
+ {
+ if (!(form->opts & O_NL_OVERLOAD))
+ returnCode(E_REQUEST_DENIED);
+ returnCode(Inter_Field_Navigation(FN_Next_Field, form));
+ }
+ else
+ {
+ bool May_Do_It = !Last_Row && Is_There_Room_For_A_Line(form);
+
+ if (!(May_Do_It || Growable(field)))
+ returnCode(E_REQUEST_DENIED);
+ if (!May_Do_It && !Field_Grown(field, 1))
+ returnCode(E_SYSTEM_ERROR);
+
+ bp = Address_Of_Current_Position_In_Buffer(form);
+ t = After_End_Of_Data(bp, field->dcols - form->curcol);
+ wmove(form->w, form->currow, form->curcol);
+ wclrtoeol(form->w);
+ form->currow++;
+ form->curcol = 0;
+ wmove(form->w, form->currow, form->curcol);
+ winsertln(form->w);
+ myADDNSTR(form->w, bp, (int)(t - bp));
+ form->status |= _WINDOW_MODIFIED;
+ returnCode(E_OK);
+ }
+ }
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FE_Insert_Character(FORM * form)
+|
+| Description : Insert blank character at the cursor position
+|
+| Return Values : E_OK
+| E_REQUEST_DENIED
++--------------------------------------------------------------------------*/
+static int
+FE_Insert_Character(FORM *form)
+{
+ FIELD *field = form->current;
+ int result = E_REQUEST_DENIED;
+
+ T((T_CALLED("FE_Insert_Character(%p)"), form));
+ if (Check_Char(field->type, (int)C_BLANK, (TypeArgument *)(field->arg)))
+ {
+ bool There_Is_Room = Is_There_Room_For_A_Char_In_Line(form);
+
+ if (There_Is_Room ||
+ ((Single_Line_Field(field) && Growable(field))))
+ {
+ if (!There_Is_Room && !Field_Grown(field, 1))
+ result = E_SYSTEM_ERROR;
+ else
+ {
+ winsch(form->w, (chtype)C_BLANK);
+ result = Wrapping_Not_Necessary_Or_Wrapping_Ok(form);
+ }
+ }
+ }
+ returnCode(result);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FE_Insert_Line(FORM * form)
+|
+| Description : Insert a blank line at the cursor position
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - line can not be inserted
++--------------------------------------------------------------------------*/
+static int
+FE_Insert_Line(FORM *form)
+{
+ FIELD *field = form->current;
+ int result = E_REQUEST_DENIED;
+
+ T((T_CALLED("FE_Insert_Line(%p)"), form));
+ if (Check_Char(field->type, (int)C_BLANK, (TypeArgument *)(field->arg)))
+ {
+ bool Maybe_Done = (form->currow != (field->drows - 1)) &&
+ Is_There_Room_For_A_Line(form);
+
+ if (!Single_Line_Field(field) &&
+ (Maybe_Done || Growable(field)))
+ {
+ if (!Maybe_Done && !Field_Grown(field, 1))
+ result = E_SYSTEM_ERROR;
+ else
+ {
+ form->curcol = 0;
+ winsertln(form->w);
+ result = E_OK;
+ }
+ }
+ }
+ returnCode(result);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FE_Delete_Character(FORM * form)
+|
+| Description : Delete character at the cursor position
+|
+| Return Values : E_OK - success
++--------------------------------------------------------------------------*/
+static int
+FE_Delete_Character(FORM *form)
+{
+ T((T_CALLED("FE_Delete_Character(%p)"), form));
+ DeleteChar(form);
+ returnCode(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FE_Delete_Previous(FORM * form)
+|
+| Description : Delete character before cursor. Again this is a rather
+| difficult piece compared to others due to the overloading
+| semantics of backspace.
+| N.B.: The case of overloaded BS on first field position
+| is already handled in the generic routine.
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - Character can't be deleted
++--------------------------------------------------------------------------*/
+static int
+FE_Delete_Previous(FORM *form)
+{
+ FIELD *field = form->current;
+
+ T((T_CALLED("FE_Delete_Previous(%p)"), form));
+ if (First_Position_In_Current_Field(form))
+ returnCode(E_REQUEST_DENIED);
+
+ if ((--(form->curcol)) < 0)
+ {
+ FIELD_CELL *this_line, *prev_line, *prev_end, *this_end;
+ int this_row = form->currow;
+
+ form->curcol++;
+ if (form->status & _OVLMODE)
+ returnCode(E_REQUEST_DENIED);
+
+ prev_line = Address_Of_Row_In_Buffer(field, (form->currow - 1));
+ this_line = Address_Of_Row_In_Buffer(field, (form->currow));
+ Synchronize_Buffer(form);
+ prev_end = After_End_Of_Data(prev_line, field->dcols);
+ this_end = After_End_Of_Data(this_line, field->dcols);
+ if ((int)(this_end - this_line) >
+ (field->cols - (int)(prev_end - prev_line)))
+ returnCode(E_REQUEST_DENIED);
+ wmove(form->w, form->currow, form->curcol);
+ wdeleteln(form->w);
+ Adjust_Cursor_Position(form, prev_end);
+ /*
+ * If we did not really move to the previous line, help the user a
+ * little. It is however a little inconsistent. Normally, when
+ * backspacing around the point where text wraps to a new line in a
+ * multi-line form, we absorb one keystroke for the wrapping point. That
+ * is consistent with SVr4 forms. However, SVr4 does not allow typing
+ * into the last column of the field, and requires the user to enter a
+ * newline to move to the next line. Therefore it can consistently eat
+ * that keystroke. Since ncurses allows the last column, it wraps
+ * automatically (given the proper options). But we cannot eat the
+ * keystroke to back over the wrapping point, since that would put the
+ * cursor past the end of the form field. In this case, just delete the
+ * character at the end of the field.
+ */
+ if (form->currow == this_row && this_row > 0)
+ {
+ form->currow -= 1;
+ form->curcol = field->dcols - 1;
+ DeleteChar(form);
+ }
+ else
+ {
+ wmove(form->w, form->currow, form->curcol);
+ myADDNSTR(form->w, this_line, (int)(this_end - this_line));
+ }
+ }
+ else
+ {
+ DeleteChar(form);
+ }
+ returnCode(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FE_Delete_Line(FORM * form)
+|
+| Description : Delete line at cursor position.
+|
+| Return Values : E_OK - success
++--------------------------------------------------------------------------*/
+static int
+FE_Delete_Line(FORM *form)
+{
+ T((T_CALLED("FE_Delete_Line(%p)"), form));
+ form->curcol = 0;
+ wdeleteln(form->w);
+ returnCode(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FE_Delete_Word(FORM * form)
+|
+| Description : Delete word at cursor position
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - failure
++--------------------------------------------------------------------------*/
+static int
+FE_Delete_Word(FORM *form)
+{
+ FIELD *field = form->current;
+ FIELD_CELL *bp = Address_Of_Current_Row_In_Buffer(form);
+ FIELD_CELL *ep = bp + field->dcols;
+ FIELD_CELL *cp = bp + form->curcol;
+ FIELD_CELL *s;
+
+ T((T_CALLED("FE_Delete_Word(%p)"), form));
+ Synchronize_Buffer(form);
+ if (ISBLANK(*cp))
+ returnCode(E_REQUEST_DENIED); /* not in word */
+
+ /* move cursor to begin of word and erase to end of screen-line */
+ Adjust_Cursor_Position(form,
+ After_Last_Whitespace_Character(bp, form->curcol));
+ wmove(form->w, form->currow, form->curcol);
+ wclrtoeol(form->w);
+
+ /* skip over word in buffer */
+ s = Get_First_Whitespace_Character(cp, (int)(ep - cp));
+ /* to begin of next word */
+ s = Get_Start_Of_Data(s, (int)(ep - s));
+ if ((s != cp) && !ISBLANK(*s))
+ {
+ /* copy remaining line to window */
+ myADDNSTR(form->w, s, (int)(s - After_End_Of_Data(s, (int)(ep - s))));
+ }
+ returnCode(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FE_Clear_To_End_Of_Line(FORM * form)
+|
+| Description : Clear to end of current line.
+|
+| Return Values : E_OK - success
++--------------------------------------------------------------------------*/
+static int
+FE_Clear_To_End_Of_Line(FORM *form)
+{
+ T((T_CALLED("FE_Clear_To_End_Of_Line(%p)"), form));
+ wmove(form->w, form->currow, form->curcol);
+ wclrtoeol(form->w);
+ returnCode(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FE_Clear_To_End_Of_Field(FORM * form)
+|
+| Description : Clear to end of field.
+|
+| Return Values : E_OK - success
++--------------------------------------------------------------------------*/
+static int
+FE_Clear_To_End_Of_Field(FORM *form)
+{
+ T((T_CALLED("FE_Clear_To_End_Of_Field(%p)"), form));
+ wmove(form->w, form->currow, form->curcol);
+ wclrtobot(form->w);
+ returnCode(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FE_Clear_Field(FORM * form)
+|
+| Description : Clear entire field.
+|
+| Return Values : E_OK - success
++--------------------------------------------------------------------------*/
+static int
+FE_Clear_Field(FORM *form)
+{
+ T((T_CALLED("FE_Clear_Field(%p)"), form));
+ form->currow = form->curcol = 0;
+ werase(form->w);
+ returnCode(E_OK);
+}
+/*----------------------------------------------------------------------------
+ END of Field Editing routines
+ --------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+ Edit Mode routines
+ --------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int EM_Overlay_Mode(FORM * form)
+|
+| Description : Switch to overlay mode.
+|
+| Return Values : E_OK - success
++--------------------------------------------------------------------------*/
+static int
+EM_Overlay_Mode(FORM *form)
+{
+ T((T_CALLED("EM_Overlay_Mode(%p)"), form));
+ form->status |= _OVLMODE;
+ returnCode(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int EM_Insert_Mode(FORM * form)
+|
+| Description : Switch to insert mode
+|
+| Return Values : E_OK - success
++--------------------------------------------------------------------------*/
+static int
+EM_Insert_Mode(FORM *form)
+{
+ T((T_CALLED("EM_Insert_Mode(%p)"), form));
+ form->status &= ~_OVLMODE;
+ returnCode(E_OK);
+}
+
+/*----------------------------------------------------------------------------
+ END of Edit Mode routines
+ --------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+ Helper routines for Choice Requests
+ --------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static bool Next_Choice(
+| FIELDTYPE * typ,
+| FIELD * field,
+| TypeArgument *argp)
+|
+| Description : Get the next field choice. For linked types this is
+| done recursively.
+|
+| Return Values : TRUE - next choice successfully retrieved
+| FALSE - couldn't retrieve next choice
++--------------------------------------------------------------------------*/
+static bool
+Next_Choice(FIELDTYPE *typ, FIELD *field, TypeArgument *argp)
+{
+ if (!typ || !(typ->status & _HAS_CHOICE))
+ return FALSE;
+
+ if (typ->status & _LINKED_TYPE)
+ {
+ assert(argp);
+ return (
+ Next_Choice(typ->left, field, argp->left) ||
+ Next_Choice(typ->right, field, argp->right));
+ }
+ else
+ {
+ assert(typ->next);
+ return typ->next(field, (void *)argp);
+ }
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static bool Previous_Choice(
+| FIELDTYPE * typ,
+| FIELD * field,
+| TypeArgument *argp)
+|
+| Description : Get the previous field choice. For linked types this
+| is done recursively.
+|
+| Return Values : TRUE - previous choice successfully retrieved
+| FALSE - couldn't retrieve previous choice
++--------------------------------------------------------------------------*/
+static bool
+Previous_Choice(FIELDTYPE *typ, FIELD *field, TypeArgument *argp)
+{
+ if (!typ || !(typ->status & _HAS_CHOICE))
+ return FALSE;
+
+ if (typ->status & _LINKED_TYPE)
+ {
+ assert(argp);
+ return (
+ Previous_Choice(typ->left, field, argp->left) ||
+ Previous_Choice(typ->right, field, argp->right));
+ }
+ else
+ {
+ assert(typ->prev);
+ return typ->prev(field, (void *)argp);
+ }
+}
+/*----------------------------------------------------------------------------
+ End of Helper routines for Choice Requests
+ --------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+ Routines for Choice Requests
+ --------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int CR_Next_Choice(FORM * form)
+|
+| Description : Get the next field choice.
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - next choice couldn't be retrieved
++--------------------------------------------------------------------------*/
+static int
+CR_Next_Choice(FORM *form)
+{
+ FIELD *field = form->current;
+
+ T((T_CALLED("CR_Next_Choice(%p)"), form));
+ Synchronize_Buffer(form);
+ returnCode((Next_Choice(field->type, field, (TypeArgument *)(field->arg)))
+ ? E_OK
+ : E_REQUEST_DENIED);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int CR_Previous_Choice(FORM * form)
+|
+| Description : Get the previous field choice.
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - prev. choice couldn't be retrieved
++--------------------------------------------------------------------------*/
+static int
+CR_Previous_Choice(FORM *form)
+{
+ FIELD *field = form->current;
+
+ T((T_CALLED("CR_Previous_Choice(%p)"), form));
+ Synchronize_Buffer(form);
+ returnCode((Previous_Choice(field->type, field, (TypeArgument *)(field->arg)))
+ ? E_OK
+ : E_REQUEST_DENIED);
+}
+/*----------------------------------------------------------------------------
+ End of Routines for Choice Requests
+ --------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+ Helper routines for Field Validations.
+ --------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static bool Check_Field(
+| FIELDTYPE * typ,
+| FIELD * field,
+| TypeArgument * argp)
+|
+| Description : Check the field according to its fieldtype and its
+| actual arguments. For linked fieldtypes this is done
+| recursively.
+|
+| Return Values : TRUE - field is valid
+| FALSE - field is invalid.
++--------------------------------------------------------------------------*/
+static bool
+Check_Field(FIELDTYPE *typ, FIELD *field, TypeArgument *argp)
+{
+ if (typ)
+ {
+ if (field->opts & O_NULLOK)
+ {
+ FIELD_CELL *bp = field->buf;
+
+ assert(bp);
+ while (ISBLANK(*bp))
+ {
+ bp++;
+ }
+ if (CharOf(*bp) == 0)
+ return TRUE;
+ }
+
+ if (typ->status & _LINKED_TYPE)
+ {
+ assert(argp);
+ return (
+ Check_Field(typ->left, field, argp->left) ||
+ Check_Field(typ->right, field, argp->right));
+ }
+ else
+ {
+ if (typ->fcheck)
+ return typ->fcheck(field, (void *)argp);
+ }
+ }
+ return TRUE;
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : bool _nc_Internal_Validation(FORM * form )
+|
+| Description : Validate the current field of the form.
+|
+| Return Values : TRUE - field is valid
+| FALSE - field is invalid
++--------------------------------------------------------------------------*/
+NCURSES_EXPORT(bool)
+_nc_Internal_Validation(FORM *form)
+{
+ FIELD *field;
+
+ field = form->current;
+
+ Synchronize_Buffer(form);
+ if ((form->status & _FCHECK_REQUIRED) ||
+ (!(field->opts & O_PASSOK)))
+ {
+ if (!Check_Field(field->type, field, (TypeArgument *)(field->arg)))
+ return FALSE;
+ form->status &= ~_FCHECK_REQUIRED;
+ field->status |= _CHANGED;
+ Synchronize_Linked_Fields(field);
+ }
+ return TRUE;
+}
+/*----------------------------------------------------------------------------
+ End of Helper routines for Field Validations.
+ --------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+ Routines for Field Validation.
+ --------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FV_Validation(FORM * form)
+|
+| Description : Validate the current field of the form.
+|
+| Return Values : E_OK - field valid
+| E_INVALID_FIELD - field not valid
++--------------------------------------------------------------------------*/
+static int
+FV_Validation(FORM *form)
+{
+ T((T_CALLED("FV_Validation(%p)"), form));
+ if (_nc_Internal_Validation(form))
+ returnCode(E_OK);
+ else
+ returnCode(E_INVALID_FIELD);
+}
+/*----------------------------------------------------------------------------
+ End of routines for Field Validation.
+ --------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+ Helper routines for Inter-Field Navigation
+ --------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static FIELD *Next_Field_On_Page(FIELD * field)
+|
+| Description : Get the next field after the given field on the current
+| page. The order of fields is the one defined by the
+| fields array. Only visible and active fields are
+| counted.
+|
+| Return Values : Pointer to the next field.
++--------------------------------------------------------------------------*/
+NCURSES_INLINE static FIELD *
+Next_Field_On_Page(FIELD *field)
+{
+ FORM *form = field->form;
+ FIELD **field_on_page = &form->field[field->index];
+ FIELD **first_on_page = &form->field[form->page[form->curpage].pmin];
+ FIELD **last_on_page = &form->field[form->page[form->curpage].pmax];
+
+ do
+ {
+ field_on_page =
+ (field_on_page == last_on_page) ? first_on_page : field_on_page + 1;
+ if (Field_Is_Selectable(*field_on_page))
+ break;
+ }
+ while (field != (*field_on_page));
+ return (*field_on_page);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : FIELD* _nc_First_Active_Field(FORM * form)
+|
+| Description : Get the first active field on the current page,
+| if there are such. If there are none, get the first
+| visible field on the page. If there are also none,
+| we return the first field on page and hope the best.
+|
+| Return Values : Pointer to calculated field.
++--------------------------------------------------------------------------*/
+NCURSES_EXPORT(FIELD *)
+_nc_First_Active_Field(FORM *form)
+{
+ FIELD **last_on_page = &form->field[form->page[form->curpage].pmax];
+ FIELD *proposed = Next_Field_On_Page(*last_on_page);
+
+ if (proposed == *last_on_page)
+ {
+ /* there might be the special situation, where there is no
+ active and visible field on the current page. We then select
+ the first visible field on this readonly page
+ */
+ if (Field_Is_Not_Selectable(proposed))
+ {
+ FIELD **field = &form->field[proposed->index];
+ FIELD **first = &form->field[form->page[form->curpage].pmin];
+
+ do
+ {
+ field = (field == last_on_page) ? first : field + 1;
+ if (((*field)->opts & O_VISIBLE))
+ break;
+ }
+ while (proposed != (*field));
+
+ proposed = *field;
+
+ if ((proposed == *last_on_page) && !(proposed->opts & O_VISIBLE))
+ {
+ /* This means, there is also no visible field on the page.
+ So we propose the first one and hope the very best...
+ Some very clever user has designed a readonly and invisible
+ page on this form.
+ */
+ proposed = *first;
+ }
+ }
+ }
+ return (proposed);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static FIELD *Previous_Field_On_Page(FIELD * field)
+|
+| Description : Get the previous field before the given field on the
+| current page. The order of fields is the one defined by
+| the fields array. Only visible and active fields are
+| counted.
+|
+| Return Values : Pointer to the previous field.
++--------------------------------------------------------------------------*/
+NCURSES_INLINE static FIELD *
+Previous_Field_On_Page(FIELD *field)
+{
+ FORM *form = field->form;
+ FIELD **field_on_page = &form->field[field->index];
+ FIELD **first_on_page = &form->field[form->page[form->curpage].pmin];
+ FIELD **last_on_page = &form->field[form->page[form->curpage].pmax];
+
+ do
+ {
+ field_on_page =
+ (field_on_page == first_on_page) ? last_on_page : field_on_page - 1;
+ if (Field_Is_Selectable(*field_on_page))
+ break;
+ }
+ while (field != (*field_on_page));
+
+ return (*field_on_page);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static FIELD *Sorted_Next_Field(FIELD * field)
+|
+| Description : Get the next field after the given field on the current
+| page. The order of fields is the one defined by the
+| (row,column) geometry, rows are major.
+|
+| Return Values : Pointer to the next field.
++--------------------------------------------------------------------------*/
+NCURSES_INLINE static FIELD *
+Sorted_Next_Field(FIELD *field)
+{
+ FIELD *field_on_page = field;
+
+ do
+ {
+ field_on_page = field_on_page->snext;
+ if (Field_Is_Selectable(field_on_page))
+ break;
+ }
+ while (field_on_page != field);
+
+ return (field_on_page);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static FIELD *Sorted_Previous_Field(FIELD * field)
+|
+| Description : Get the previous field before the given field on the
+| current page. The order of fields is the one defined
+| by the (row,column) geometry, rows are major.
+|
+| Return Values : Pointer to the previous field.
++--------------------------------------------------------------------------*/
+NCURSES_INLINE static FIELD *
+Sorted_Previous_Field(FIELD *field)
+{
+ FIELD *field_on_page = field;
+
+ do
+ {
+ field_on_page = field_on_page->sprev;
+ if (Field_Is_Selectable(field_on_page))
+ break;
+ }
+ while (field_on_page != field);
+
+ return (field_on_page);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static FIELD *Left_Neighbor_Field(FIELD * field)
+|
+| Description : Get the left neighbor of the field on the same line
+| and the same page. Cycles through the line.
+|
+| Return Values : Pointer to left neighbor field.
++--------------------------------------------------------------------------*/
+NCURSES_INLINE static FIELD *
+Left_Neighbor_Field(FIELD *field)
+{
+ FIELD *field_on_page = field;
+
+ /* For a field that has really a left neighbor, the while clause
+ immediately fails and the loop is left, positioned at the right
+ neighbor. Otherwise we cycle backwards through the sorted field list
+ until we enter the same line (from the right end).
+ */
+ do
+ {
+ field_on_page = Sorted_Previous_Field(field_on_page);
+ }
+ while (field_on_page->frow != field->frow);
+
+ return (field_on_page);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static FIELD *Right_Neighbor_Field(FIELD * field)
+|
+| Description : Get the right neighbor of the field on the same line
+| and the same page.
+|
+| Return Values : Pointer to right neighbor field.
++--------------------------------------------------------------------------*/
+NCURSES_INLINE static FIELD *
+Right_Neighbor_Field(FIELD *field)
+{
+ FIELD *field_on_page = field;
+
+ /* See the comments on Left_Neighbor_Field to understand how it works */
+ do
+ {
+ field_on_page = Sorted_Next_Field(field_on_page);
+ }
+ while (field_on_page->frow != field->frow);
+
+ return (field_on_page);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static FIELD *Upper_Neighbor_Field(FIELD * field)
+|
+| Description : Because of the row-major nature of sorting the fields,
+| it is more difficult to define whats the upper neighbor
+| field really means. We define that it must be on a
+| 'previous' line (cyclic order!) and is the rightmost
+| field laying on the left side of the given field. If
+| this set is empty, we take the first field on the line.
+|
+| Return Values : Pointer to the upper neighbor field.
++--------------------------------------------------------------------------*/
+static FIELD *
+Upper_Neighbor_Field(FIELD *field)
+{
+ FIELD *field_on_page = field;
+ int frow = field->frow;
+ int fcol = field->fcol;
+
+ /* Walk back to the 'previous' line. The second term in the while clause
+ just guarantees that we stop if we cycled through the line because
+ there might be no 'previous' line if the page has just one line.
+ */
+ do
+ {
+ field_on_page = Sorted_Previous_Field(field_on_page);
+ }
+ while (field_on_page->frow == frow && field_on_page->fcol != fcol);
+
+ if (field_on_page->frow != frow)
+ {
+ /* We really found a 'previous' line. We are positioned at the
+ rightmost field on this line */
+ frow = field_on_page->frow;
+
+ /* We walk to the left as long as we are really right of the
+ field. */
+ while (field_on_page->frow == frow && field_on_page->fcol > fcol)
+ field_on_page = Sorted_Previous_Field(field_on_page);
+
+ /* If we wrapped, just go to the right which is the first field on
+ the row */
+ if (field_on_page->frow != frow)
+ field_on_page = Sorted_Next_Field(field_on_page);
+ }
+
+ return (field_on_page);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static FIELD *Down_Neighbor_Field(FIELD * field)
+|
+| Description : Because of the row-major nature of sorting the fields,
+| its more difficult to define whats the down neighbor
+| field really means. We define that it must be on a
+| 'next' line (cyclic order!) and is the leftmost
+| field laying on the right side of the given field. If
+| this set is empty, we take the last field on the line.
+|
+| Return Values : Pointer to the upper neighbor field.
++--------------------------------------------------------------------------*/
+static FIELD *
+Down_Neighbor_Field(FIELD *field)
+{
+ FIELD *field_on_page = field;
+ int frow = field->frow;
+ int fcol = field->fcol;
+
+ /* Walk forward to the 'next' line. The second term in the while clause
+ just guarantees that we stop if we cycled through the line because
+ there might be no 'next' line if the page has just one line.
+ */
+ do
+ {
+ field_on_page = Sorted_Next_Field(field_on_page);
+ }
+ while (field_on_page->frow == frow && field_on_page->fcol != fcol);
+
+ if (field_on_page->frow != frow)
+ {
+ /* We really found a 'next' line. We are positioned at the rightmost
+ field on this line */
+ frow = field_on_page->frow;
+
+ /* We walk to the right as long as we are really left of the
+ field. */
+ while (field_on_page->frow == frow && field_on_page->fcol < fcol)
+ field_on_page = Sorted_Next_Field(field_on_page);
+
+ /* If we wrapped, just go to the left which is the last field on
+ the row */
+ if (field_on_page->frow != frow)
+ field_on_page = Sorted_Previous_Field(field_on_page);
+ }
+
+ return (field_on_page);
+}
+
+/*----------------------------------------------------------------------------
+ Inter-Field Navigation routines
+ --------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int Inter_Field_Navigation(
+| int (* const fct) (FORM *),
+| FORM * form)
+|
+| Description : Generic behavior for changing the current field, the
+| field is left and a new field is entered. So the field
+| must be validated and the field init/term hooks must
+| be called.
+|
+| Return Values : E_OK - success
+| E_INVALID_FIELD - field is invalid
+| some other - error from subordinate call
++--------------------------------------------------------------------------*/
+static int
+Inter_Field_Navigation(int (*const fct) (FORM *), FORM *form)
+{
+ int res;
+
+ if (!_nc_Internal_Validation(form))
+ res = E_INVALID_FIELD;
+ else
+ {
+ Call_Hook(form, fieldterm);
+ res = fct(form);
+ Call_Hook(form, fieldinit);
+ }
+ return res;
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FN_Next_Field(FORM * form)
+|
+| Description : Move to the next field on the current page of the form
+|
+| Return Values : E_OK - success
+| != E_OK - error from subordinate call
++--------------------------------------------------------------------------*/
+static int
+FN_Next_Field(FORM *form)
+{
+ T((T_CALLED("FN_Next_Field(%p)"), form));
+ returnCode(_nc_Set_Current_Field(form,
+ Next_Field_On_Page(form->current)));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FN_Previous_Field(FORM * form)
+|
+| Description : Move to the previous field on the current page of the
+| form
+|
+| Return Values : E_OK - success
+| != E_OK - error from subordinate call
++--------------------------------------------------------------------------*/
+static int
+FN_Previous_Field(FORM *form)
+{
+ T((T_CALLED("FN_Previous_Field(%p)"), form));
+ returnCode(_nc_Set_Current_Field(form,
+ Previous_Field_On_Page(form->current)));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FN_First_Field(FORM * form)
+|
+| Description : Move to the first field on the current page of the form
+|
+| Return Values : E_OK - success
+| != E_OK - error from subordinate call
++--------------------------------------------------------------------------*/
+static int
+FN_First_Field(FORM *form)
+{
+ T((T_CALLED("FN_First_Field(%p)"), form));
+ returnCode(_nc_Set_Current_Field(form,
+ Next_Field_On_Page(form->field[form->page[form->curpage].pmax])));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FN_Last_Field(FORM * form)
+|
+| Description : Move to the last field on the current page of the form
+|
+| Return Values : E_OK - success
+| != E_OK - error from subordinate call
++--------------------------------------------------------------------------*/
+static int
+FN_Last_Field(FORM *form)
+{
+ T((T_CALLED("FN_Last_Field(%p)"), form));
+ returnCode(
+ _nc_Set_Current_Field(form,
+ Previous_Field_On_Page(form->field[form->page[form->curpage].pmin])));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FN_Sorted_Next_Field(FORM * form)
+|
+| Description : Move to the sorted next field on the current page
+| of the form.
+|
+| Return Values : E_OK - success
+| != E_OK - error from subordinate call
++--------------------------------------------------------------------------*/
+static int
+FN_Sorted_Next_Field(FORM *form)
+{
+ T((T_CALLED("FN_Sorted_Next_Field(%p)"), form));
+ returnCode(_nc_Set_Current_Field(form,
+ Sorted_Next_Field(form->current)));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FN_Sorted_Previous_Field(FORM * form)
+|
+| Description : Move to the sorted previous field on the current page
+| of the form.
+|
+| Return Values : E_OK - success
+| != E_OK - error from subordinate call
++--------------------------------------------------------------------------*/
+static int
+FN_Sorted_Previous_Field(FORM *form)
+{
+ T((T_CALLED("FN_Sorted_Previous_Field(%p)"), form));
+ returnCode(_nc_Set_Current_Field(form,
+ Sorted_Previous_Field(form->current)));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FN_Sorted_First_Field(FORM * form)
+|
+| Description : Move to the sorted first field on the current page
+| of the form.
+|
+| Return Values : E_OK - success
+| != E_OK - error from subordinate call
++--------------------------------------------------------------------------*/
+static int
+FN_Sorted_First_Field(FORM *form)
+{
+ T((T_CALLED("FN_Sorted_First_Field(%p)"), form));
+ returnCode(_nc_Set_Current_Field(form,
+ Sorted_Next_Field(form->field[form->page[form->curpage].smax])));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FN_Sorted_Last_Field(FORM * form)
+|
+| Description : Move to the sorted last field on the current page
+| of the form.
+|
+| Return Values : E_OK - success
+| != E_OK - error from subordinate call
++--------------------------------------------------------------------------*/
+static int
+FN_Sorted_Last_Field(FORM *form)
+{
+ T((T_CALLED("FN_Sorted_Last_Field(%p)"), form));
+ returnCode(_nc_Set_Current_Field(form,
+ Sorted_Previous_Field(form->field[form->page[form->curpage].smin])));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FN_Left_Field(FORM * form)
+|
+| Description : Get the field on the left of the current field on the
+| same line and the same page. Cycles through the line.
+|
+| Return Values : E_OK - success
+| != E_OK - error from subordinate call
++--------------------------------------------------------------------------*/
+static int
+FN_Left_Field(FORM *form)
+{
+ T((T_CALLED("FN_Left_Field(%p)"), form));
+ returnCode(_nc_Set_Current_Field(form,
+ Left_Neighbor_Field(form->current)));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FN_Right_Field(FORM * form)
+|
+| Description : Get the field on the right of the current field on the
+| same line and the same page. Cycles through the line.
+|
+| Return Values : E_OK - success
+| != E_OK - error from subordinate call
++--------------------------------------------------------------------------*/
+static int
+FN_Right_Field(FORM *form)
+{
+ T((T_CALLED("FN_Right_Field(%p)"), form));
+ returnCode(_nc_Set_Current_Field(form,
+ Right_Neighbor_Field(form->current)));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FN_Up_Field(FORM * form)
+|
+| Description : Get the upper neighbor of the current field. This
+| cycles through the page. See the comments of the
+| Upper_Neighbor_Field function to understand how
+| 'upper' is defined.
+|
+| Return Values : E_OK - success
+| != E_OK - error from subordinate call
++--------------------------------------------------------------------------*/
+static int
+FN_Up_Field(FORM *form)
+{
+ T((T_CALLED("FN_Up_Field(%p)"), form));
+ returnCode(_nc_Set_Current_Field(form,
+ Upper_Neighbor_Field(form->current)));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int FN_Down_Field(FORM * form)
+|
+| Description : Get the down neighbor of the current field. This
+| cycles through the page. See the comments of the
+| Down_Neighbor_Field function to understand how
+| 'down' is defined.
+|
+| Return Values : E_OK - success
+| != E_OK - error from subordinate call
++--------------------------------------------------------------------------*/
+static int
+FN_Down_Field(FORM *form)
+{
+ T((T_CALLED("FN_Down_Field(%p)"), form));
+ returnCode(_nc_Set_Current_Field(form,
+ Down_Neighbor_Field(form->current)));
+}
+/*----------------------------------------------------------------------------
+ END of Field Navigation routines
+ --------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+ Helper routines for Page Navigation
+ --------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : int _nc_Set_Form_Page(FORM * form,
+| int page,
+| FIELD * field)
+|
+| Description : Make the given page number the current page and make
+| the given field the current field on the page. If
+| for the field NULL is given, make the first field on
+| the page the current field. The routine acts only
+| if the requested page is not the current page.
+|
+| Return Values : E_OK - success
+| != E_OK - error from subordinate call
+| E_BAD_ARGUMENT - invalid field pointer
+| E_SYSTEM_ERROR - some severe basic error
++--------------------------------------------------------------------------*/
+NCURSES_EXPORT(int)
+_nc_Set_Form_Page(FORM *form, int page, FIELD *field)
+{
+ int res = E_OK;
+
+ if ((form->curpage != page))
+ {
+ FIELD *last_field, *field_on_page;
+
+ werase(Get_Form_Window(form));
+ form->curpage = page;
+ last_field = field_on_page = form->field[form->page[page].smin];
+ do
+ {
+ if (field_on_page->opts & O_VISIBLE)
+ if ((res = Display_Field(field_on_page)) != E_OK)
+ return (res);
+ field_on_page = field_on_page->snext;
+ }
+ while (field_on_page != last_field);
+
+ if (field)
+ res = _nc_Set_Current_Field(form, field);
+ else
+ /* N.B.: we don't encapsulate this by Inter_Field_Navigation(),
+ because this is already executed in a page navigation
+ context that contains field navigation
+ */
+ res = FN_First_Field(form);
+ }
+ return (res);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int Next_Page_Number(const FORM * form)
+|
+| Description : Calculate the page number following the current page
+| number. This cycles if the highest page number is
+| reached.
+|
+| Return Values : The next page number
++--------------------------------------------------------------------------*/
+NCURSES_INLINE static int
+Next_Page_Number(const FORM *form)
+{
+ return (form->curpage + 1) % form->maxpage;
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int Previous_Page_Number(const FORM * form)
+|
+| Description : Calculate the page number before the current page
+| number. This cycles if the first page number is
+| reached.
+|
+| Return Values : The previous page number
++--------------------------------------------------------------------------*/
+NCURSES_INLINE static int
+Previous_Page_Number(const FORM *form)
+{
+ return (form->curpage != 0 ? form->curpage - 1 : form->maxpage - 1);
+}
+
+/*----------------------------------------------------------------------------
+ Page Navigation routines
+ --------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int Page_Navigation(
+| int (* const fct) (FORM *),
+| FORM * form)
+|
+| Description : Generic behavior for changing a page. This means
+| that the field is left and a new field is entered.
+| So the field must be validated and the field init/term
+| hooks must be called. Because also the page is changed,
+| the forms init/term hooks must be called also.
+|
+| Return Values : E_OK - success
+| E_INVALID_FIELD - field is invalid
+| some other - error from subordinate call
++--------------------------------------------------------------------------*/
+static int
+Page_Navigation(int (*const fct) (FORM *), FORM *form)
+{
+ int res;
+
+ if (!_nc_Internal_Validation(form))
+ res = E_INVALID_FIELD;
+ else
+ {
+ Call_Hook(form, fieldterm);
+ Call_Hook(form, formterm);
+ res = fct(form);
+ Call_Hook(form, forminit);
+ Call_Hook(form, fieldinit);
+ }
+ return res;
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int PN_Next_Page(FORM * form)
+|
+| Description : Move to the next page of the form
+|
+| Return Values : E_OK - success
+| != E_OK - error from subordinate call
++--------------------------------------------------------------------------*/
+static int
+PN_Next_Page(FORM *form)
+{
+ T((T_CALLED("PN_Next_Page(%p)"), form));
+ returnCode(_nc_Set_Form_Page(form, Next_Page_Number(form), (FIELD *)0));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int PN_Previous_Page(FORM * form)
+|
+| Description : Move to the previous page of the form
+|
+| Return Values : E_OK - success
+| != E_OK - error from subordinate call
++--------------------------------------------------------------------------*/
+static int
+PN_Previous_Page(FORM *form)
+{
+ T((T_CALLED("PN_Previous_Page(%p)"), form));
+ returnCode(_nc_Set_Form_Page(form, Previous_Page_Number(form), (FIELD *)0));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int PN_First_Page(FORM * form)
+|
+| Description : Move to the first page of the form
+|
+| Return Values : E_OK - success
+| != E_OK - error from subordinate call
++--------------------------------------------------------------------------*/
+static int
+PN_First_Page(FORM *form)
+{
+ T((T_CALLED("PN_First_Page(%p)"), form));
+ returnCode(_nc_Set_Form_Page(form, 0, (FIELD *)0));
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int PN_Last_Page(FORM * form)
+|
+| Description : Move to the last page of the form
+|
+| Return Values : E_OK - success
+| != E_OK - error from subordinate call
++--------------------------------------------------------------------------*/
+static int
+PN_Last_Page(FORM *form)
+{
+ T((T_CALLED("PN_Last_Page(%p)"), form));
+ returnCode(_nc_Set_Form_Page(form, form->maxpage - 1, (FIELD *)0));
+}
+
+/*----------------------------------------------------------------------------
+ END of Field Navigation routines
+ --------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+ Helper routines for the core form driver.
+ --------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static int Data_Entry(FORM * form,int c)
+|
+| Description : Enter character c into at the current position of the
+| current field of the form.
+|
+| Return Values : E_OK - success
+| E_REQUEST_DENIED - driver could not process the request
+| E_SYSTEM_ERROR -
++--------------------------------------------------------------------------*/
+static int
+Data_Entry(FORM *form, int c)
+{
+ FIELD *field = form->current;
+ int result = E_REQUEST_DENIED;
+
+ T((T_CALLED("Data_Entry(%p,%s)"), form, _tracechtype((chtype)c)));
+ if ((field->opts & O_EDIT)
+#if FIX_FORM_INACTIVE_BUG
+ && (field->opts & O_ACTIVE)
+#endif
+ )
+ {
+ if ((field->opts & O_BLANK) &&
+ First_Position_In_Current_Field(form) &&
+ !(form->status & _FCHECK_REQUIRED) &&
+ !(form->status & _WINDOW_MODIFIED))
+ werase(form->w);
+
+ if (form->status & _OVLMODE)
+ {
+ waddch(form->w, (chtype)c);
+ }
+ else
+ /* no _OVLMODE */
+ {
+ bool There_Is_Room = Is_There_Room_For_A_Char_In_Line(form);
+
+ if (!(There_Is_Room ||
+ ((Single_Line_Field(field) && Growable(field)))))
+ RETURN(E_REQUEST_DENIED);
+
+ if (!There_Is_Room && !Field_Grown(field, 1))
+ RETURN(E_SYSTEM_ERROR);
+
+ winsch(form->w, (chtype)c);
+ }
+
+ if ((result = Wrapping_Not_Necessary_Or_Wrapping_Ok(form)) == E_OK)
+ {
+ bool End_Of_Field = (((field->drows - 1) == form->currow) &&
+ ((field->dcols - 1) == form->curcol));
+
+ form->status |= _WINDOW_MODIFIED;
+ if (End_Of_Field && !Growable(field) && (field->opts & O_AUTOSKIP))
+ result = Inter_Field_Navigation(FN_Next_Field, form);
+ else
+ {
+ if (End_Of_Field && Growable(field) && !Field_Grown(field, 1))
+ result = E_SYSTEM_ERROR;
+ else
+ {
+#if USE_WIDEC_SUPPORT
+ /*
+ * We have just added a byte to the form field. It may have
+ * been part of a multibyte character. If it was, the
+ * addch_used field is nonzero and we should not try to move
+ * to a new column.
+ */
+ if (WINDOW_EXT(form->w, addch_used) == 0)
+ IFN_Next_Character(form);
+#else
+ IFN_Next_Character(form);
+#endif
+ result = E_OK;
+ }
+ }
+ }
+ }
+ RETURN(result);
+}
+
+/* Structure to describe the binding of a request code to a function.
+ The member keycode codes the request value as well as the generic
+ routine to use for the request. The code for the generic routine
+ is coded in the upper 16 Bits while the request code is coded in
+ the lower 16 bits.
+
+ In terms of C++ you might think of a request as a class with a
+ virtual method "perform". The different types of request are
+ derived from this base class and overload (or not) the base class
+ implementation of perform.
+*/
+typedef struct
+{
+ int keycode; /* must be at least 32 bit: hi:mode, lo: key */
+ int (*cmd) (FORM *); /* low level driver routine for this key */
+}
+Binding_Info;
+
+/* You may see this is the class-id of the request type class */
+#define ID_PN (0x00000000) /* Page navigation */
+#define ID_FN (0x00010000) /* Inter-Field navigation */
+#define ID_IFN (0x00020000) /* Intra-Field navigation */
+#define ID_VSC (0x00030000) /* Vertical Scrolling */
+#define ID_HSC (0x00040000) /* Horizontal Scrolling */
+#define ID_FE (0x00050000) /* Field Editing */
+#define ID_EM (0x00060000) /* Edit Mode */
+#define ID_FV (0x00070000) /* Field Validation */
+#define ID_CH (0x00080000) /* Choice */
+#define ID_Mask (0xffff0000)
+#define Key_Mask (0x0000ffff)
+#define ID_Shft (16)
+
+/* This array holds all the Binding Infos */
+/* *INDENT-OFF* */
+static const Binding_Info bindings[MAX_FORM_COMMAND - MIN_FORM_COMMAND + 1] =
+{
+ { REQ_NEXT_PAGE |ID_PN ,PN_Next_Page},
+ { REQ_PREV_PAGE |ID_PN ,PN_Previous_Page},
+ { REQ_FIRST_PAGE |ID_PN ,PN_First_Page},
+ { REQ_LAST_PAGE |ID_PN ,PN_Last_Page},
+
+ { REQ_NEXT_FIELD |ID_FN ,FN_Next_Field},
+ { REQ_PREV_FIELD |ID_FN ,FN_Previous_Field},
+ { REQ_FIRST_FIELD |ID_FN ,FN_First_Field},
+ { REQ_LAST_FIELD |ID_FN ,FN_Last_Field},
+ { REQ_SNEXT_FIELD |ID_FN ,FN_Sorted_Next_Field},
+ { REQ_SPREV_FIELD |ID_FN ,FN_Sorted_Previous_Field},
+ { REQ_SFIRST_FIELD |ID_FN ,FN_Sorted_First_Field},
+ { REQ_SLAST_FIELD |ID_FN ,FN_Sorted_Last_Field},
+ { REQ_LEFT_FIELD |ID_FN ,FN_Left_Field},
+ { REQ_RIGHT_FIELD |ID_FN ,FN_Right_Field},
+ { REQ_UP_FIELD |ID_FN ,FN_Up_Field},
+ { REQ_DOWN_FIELD |ID_FN ,FN_Down_Field},
+
+ { REQ_NEXT_CHAR |ID_IFN ,IFN_Next_Character},
+ { REQ_PREV_CHAR |ID_IFN ,IFN_Previous_Character},
+ { REQ_NEXT_LINE |ID_IFN ,IFN_Next_Line},
+ { REQ_PREV_LINE |ID_IFN ,IFN_Previous_Line},
+ { REQ_NEXT_WORD |ID_IFN ,IFN_Next_Word},
+ { REQ_PREV_WORD |ID_IFN ,IFN_Previous_Word},
+ { REQ_BEG_FIELD |ID_IFN ,IFN_Beginning_Of_Field},
+ { REQ_END_FIELD |ID_IFN ,IFN_End_Of_Field},
+ { REQ_BEG_LINE |ID_IFN ,IFN_Beginning_Of_Line},
+ { REQ_END_LINE |ID_IFN ,IFN_End_Of_Line},
+ { REQ_LEFT_CHAR |ID_IFN ,IFN_Left_Character},
+ { REQ_RIGHT_CHAR |ID_IFN ,IFN_Right_Character},
+ { REQ_UP_CHAR |ID_IFN ,IFN_Up_Character},
+ { REQ_DOWN_CHAR |ID_IFN ,IFN_Down_Character},
+
+ { REQ_NEW_LINE |ID_FE ,FE_New_Line},
+ { REQ_INS_CHAR |ID_FE ,FE_Insert_Character},
+ { REQ_INS_LINE |ID_FE ,FE_Insert_Line},
+ { REQ_DEL_CHAR |ID_FE ,FE_Delete_Character},
+ { REQ_DEL_PREV |ID_FE ,FE_Delete_Previous},
+ { REQ_DEL_LINE |ID_FE ,FE_Delete_Line},
+ { REQ_DEL_WORD |ID_FE ,FE_Delete_Word},
+ { REQ_CLR_EOL |ID_FE ,FE_Clear_To_End_Of_Line},
+ { REQ_CLR_EOF |ID_FE ,FE_Clear_To_End_Of_Field},
+ { REQ_CLR_FIELD |ID_FE ,FE_Clear_Field},
+
+ { REQ_OVL_MODE |ID_EM ,EM_Overlay_Mode},
+ { REQ_INS_MODE |ID_EM ,EM_Insert_Mode},
+
+ { REQ_SCR_FLINE |ID_VSC ,VSC_Scroll_Line_Forward},
+ { REQ_SCR_BLINE |ID_VSC ,VSC_Scroll_Line_Backward},
+ { REQ_SCR_FPAGE |ID_VSC ,VSC_Scroll_Page_Forward},
+ { REQ_SCR_BPAGE |ID_VSC ,VSC_Scroll_Page_Backward},
+ { REQ_SCR_FHPAGE |ID_VSC ,VSC_Scroll_Half_Page_Forward},
+ { REQ_SCR_BHPAGE |ID_VSC ,VSC_Scroll_Half_Page_Backward},
+
+ { REQ_SCR_FCHAR |ID_HSC ,HSC_Scroll_Char_Forward},
+ { REQ_SCR_BCHAR |ID_HSC ,HSC_Scroll_Char_Backward},
+ { REQ_SCR_HFLINE |ID_HSC ,HSC_Horizontal_Line_Forward},
+ { REQ_SCR_HBLINE |ID_HSC ,HSC_Horizontal_Line_Backward},
+ { REQ_SCR_HFHALF |ID_HSC ,HSC_Horizontal_Half_Line_Forward},
+ { REQ_SCR_HBHALF |ID_HSC ,HSC_Horizontal_Half_Line_Backward},
+
+ { REQ_VALIDATION |ID_FV ,FV_Validation},
+
+ { REQ_NEXT_CHOICE |ID_CH ,CR_Next_Choice},
+ { REQ_PREV_CHOICE |ID_CH ,CR_Previous_Choice}
+};
+/* *INDENT-ON* */
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : int form_driver(FORM * form,int c)
+|
+| Description : This is the workhorse of the forms system. It checks
+| to determine whether the character c is a request or
+| data. If it is a request, the form driver executes
+| the request and returns the result. If it is data
+| (printable character), it enters the data into the
+| current position in the current field. If it is not
+| recognized, the form driver assumes it is an application
+| defined command and returns E_UNKNOWN_COMMAND.
+| Application defined command should be defined relative
+| to MAX_FORM_COMMAND, the maximum value of a request.
+|
+| Return Values : E_OK - success
+| E_SYSTEM_ERROR - system error
+| E_BAD_ARGUMENT - an argument is incorrect
+| E_NOT_POSTED - form is not posted
+| E_INVALID_FIELD - field contents are invalid
+| E_BAD_STATE - called from inside a hook routine
+| E_REQUEST_DENIED - request failed
+| E_NOT_CONNECTED - no fields are connected to the form
+| E_UNKNOWN_COMMAND - command not known
++--------------------------------------------------------------------------*/
+NCURSES_EXPORT(int)
+form_driver(FORM *form, int c)
+{
+ const Binding_Info *BI = (Binding_Info *) 0;
+ int res = E_UNKNOWN_COMMAND;
+
+ T((T_CALLED("form_driver(%p,%d)"), form, c));
+
+ if (!form)
+ RETURN(E_BAD_ARGUMENT);
+
+ if (!(form->field))
+ RETURN(E_NOT_CONNECTED);
+
+ assert(form->page);
+
+ if (c == FIRST_ACTIVE_MAGIC)
+ {
+ form->current = _nc_First_Active_Field(form);
+ RETURN(E_OK);
+ }
+
+ assert(form->current &&
+ form->current->buf &&
+ (form->current->form == form)
+ );
+
+ if (form->status & _IN_DRIVER)
+ RETURN(E_BAD_STATE);
+
+ if (!(form->status & _POSTED))
+ RETURN(E_NOT_POSTED);
+
+ if ((c >= MIN_FORM_COMMAND && c <= MAX_FORM_COMMAND) &&
+ ((bindings[c - MIN_FORM_COMMAND].keycode & Key_Mask) == c))
+ BI = &(bindings[c - MIN_FORM_COMMAND]);
+
+ if (BI)
+ {
+ typedef int (*Generic_Method) (int (*const) (FORM *), FORM *);
+ static const Generic_Method Generic_Methods[] =
+ {
+ Page_Navigation, /* overloaded to call field&form hooks */
+ Inter_Field_Navigation, /* overloaded to call field hooks */
+ NULL, /* Intra-Field is generic */
+ Vertical_Scrolling, /* Overloaded to check multi-line */
+ Horizontal_Scrolling, /* Overloaded to check single-line */
+ Field_Editing, /* Overloaded to mark modification */
+ NULL, /* Edit Mode is generic */
+ NULL, /* Field Validation is generic */
+ NULL /* Choice Request is generic */
+ };
+ size_t nMethods = (sizeof(Generic_Methods) / sizeof(Generic_Methods[0]));
+ size_t method = ((BI->keycode & ID_Mask) >> ID_Shft) & 0xffff;
+
+ if ((method >= nMethods) || !(BI->cmd))
+ res = E_SYSTEM_ERROR;
+ else
+ {
+ Generic_Method fct = Generic_Methods[method];
+
+ if (fct)
+ res = fct(BI->cmd, form);
+ else
+ res = (BI->cmd) (form);
+ }
+ }
+#ifdef NCURSES_MOUSE_VERSION
+ else if (KEY_MOUSE == c)
+ {
+ MEVENT event;
+ WINDOW *win = form->win ? form->win : stdscr;
+ WINDOW *sub = form->sub ? form->sub : win;
+
+ getmouse(&event);
+ if ((event.bstate & (BUTTON1_CLICKED |
+ BUTTON1_DOUBLE_CLICKED |
+ BUTTON1_TRIPLE_CLICKED))
+ && wenclose(win, event.y, event.x))
+ { /* we react only if the click was in the userwin, that means
+ * inside the form display area or at the decoration window.
+ */
+ int ry = event.y, rx = event.x; /* screen coordinates */
+
+ res = E_REQUEST_DENIED;
+ if (mouse_trafo(&ry, &rx, FALSE))
+ { /* rx, ry are now "curses" coordinates */
+ if (ry < sub->_begy)
+ { /* we clicked above the display region; this is
+ * interpreted as "scroll up" request
+ */
+ if (event.bstate & BUTTON1_CLICKED)
+ res = form_driver(form, REQ_PREV_FIELD);
+ else if (event.bstate & BUTTON1_DOUBLE_CLICKED)
+ res = form_driver(form, REQ_PREV_PAGE);
+ else if (event.bstate & BUTTON1_TRIPLE_CLICKED)
+ res = form_driver(form, REQ_FIRST_FIELD);
+ }
+ else if (ry > sub->_begy + sub->_maxy)
+ { /* we clicked below the display region; this is
+ * interpreted as "scroll down" request
+ */
+ if (event.bstate & BUTTON1_CLICKED)
+ res = form_driver(form, REQ_NEXT_FIELD);
+ else if (event.bstate & BUTTON1_DOUBLE_CLICKED)
+ res = form_driver(form, REQ_NEXT_PAGE);
+ else if (event.bstate & BUTTON1_TRIPLE_CLICKED)
+ res = form_driver(form, REQ_LAST_FIELD);
+ }
+ else if (wenclose(sub, event.y, event.x))
+ { /* Inside the area we try to find the hit item */
+ int i;
+
+ ry = event.y;
+ rx = event.x;
+ if (wmouse_trafo(sub, &ry, &rx, FALSE))
+ {
+ int min_field = form->page[form->curpage].pmin;
+ int max_field = form->page[form->curpage].pmax;
+
+ for (i = min_field; i <= max_field; ++i)
+ {
+ FIELD *field = form->field[i];
+
+ if (Field_Is_Selectable(field)
+ && Field_encloses(field, ry, rx) == E_OK)
+ {
+ res = _nc_Set_Current_Field(form, field);
+ if (res == E_OK)
+ res = _nc_Position_Form_Cursor(form);
+ if (res == E_OK
+ && (event.bstate & BUTTON1_DOUBLE_CLICKED))
+ res = E_UNKNOWN_COMMAND;
+ break;
+ }
+ }
+ }
+ }
+ }
+ }
+ else
+ res = E_REQUEST_DENIED;
+ }
+#endif /* NCURSES_MOUSE_VERSION */
+ else if (!(c & (~(int)MAX_REGULAR_CHARACTER)))
+ {
+ /*
+ * If we're using 8-bit characters, iscntrl+isprint cover the whole set.
+ * But with multibyte characters, there is a third possibility, i.e.,
+ * parts of characters that build up into printable characters which are
+ * not considered printable.
+ *
+ * FIXME: the wide-character branch should also use Check_Char().
+ */
+#if USE_WIDEC_SUPPORT
+ if (!iscntrl(UChar(c)))
+#else
+ if (isprint(UChar(c)) &&
+ Check_Char(form->current->type, c,
+ (TypeArgument *)(form->current->arg)))
+#endif
+ res = Data_Entry(form, c);
+ }
+ _nc_Refresh_Current_Field(form);
+ RETURN(res);
+}
+
+/*----------------------------------------------------------------------------
+ Field-Buffer manipulation routines.
+ The effects of setting a buffer are tightly coupled to the core of the form
+ driver logic. This is especially true in the case of growable fields.
+ So I don't separate this into a separate module.
+ --------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : int set_field_buffer(FIELD *field,
+| int buffer, char *value)
+|
+| Description : Set the given buffer of the field to the given value.
+| Buffer 0 stores the displayed content of the field.
+| For dynamic fields this may grow the fieldbuffers if
+| the length of the value exceeds the current buffer
+| length. For buffer 0 only printable values are allowed.
+| For static fields, the value needs not to be zero ter-
+| minated. It is copied up to the length of the buffer.
+|
+| Return Values : E_OK - success
+| E_BAD_ARGUMENT - invalid argument
+| E_SYSTEM_ERROR - system error
++--------------------------------------------------------------------------*/
+NCURSES_EXPORT(int)
+set_field_buffer(FIELD *field, int buffer, const char *value)
+{
+ FIELD_CELL *p;
+ int res = E_OK;
+ unsigned int i;
+ unsigned int len;
+
+#if USE_WIDEC_SUPPORT
+ FIELD_CELL *widevalue = 0;
+#endif
+
+ T((T_CALLED("set_field_buffer(%p,%d,%s)"), field, buffer, _nc_visbuf(value)));
+
+ if (!field || !value || ((buffer < 0) || (buffer > field->nbuf)))
+ RETURN(E_BAD_ARGUMENT);
+
+ len = Buffer_Length(field);
+
+ if (buffer == 0)
+ {
+ for (i = 0; (value[i] != '\0') && (i < len); ++i)
+ {
+ if (iscntrl(UChar(value[i])))
+ RETURN(E_BAD_ARGUMENT);
+ }
+ }
+
+ if (Growable(field))
+ {
+ /* for a growable field we must assume zero terminated strings, because
+ somehow we have to detect the length of what should be copied.
+ */
+ unsigned int vlen = strlen(value);
+
+ if (vlen > len)
+ {
+ if (!Field_Grown(field,
+ (int)(1 + (vlen - len) / ((field->rows + field->nrow)
+ * field->cols))))
+ RETURN(E_SYSTEM_ERROR);
+
+ /* in this case we also have to check, whether or not the remaining
+ characters in value are also printable for buffer 0. */
+ if (buffer == 0)
+ {
+ for (i = len; i < vlen; i++)
+ if (iscntrl(UChar(value[i])))
+ RETURN(E_BAD_ARGUMENT);
+ }
+ len = vlen;
+ }
+ }
+
+ p = Address_Of_Nth_Buffer(field, buffer);
+
+#if USE_WIDEC_SUPPORT
+ /*
+ * Use addstr's logic for converting a string to an array of cchar_t's.
+ * There should be a better way, but this handles nonspacing characters
+ * and other special cases that we really do not want to handle here.
+ */
+ wclear(field->working);
+ mvwaddstr(field->working, 0, 0, value);
+
+ if ((widevalue = typeCalloc(FIELD_CELL, len + 1)) == 0)
+ {
+ RETURN(E_SYSTEM_ERROR);
+ }
+ else
+ {
+ mvwin_wchnstr(field->working, 0, 0, widevalue, (int)len);
+ for (i = 0; i < len; ++i)
+ {
+ if (CharEq(myZEROS, widevalue[i]))
+ {
+ while (i < len)
+ p[i++] = myBLANK;
+ break;
+ }
+ p[i] = widevalue[i];
+ }
+ free(widevalue);
+ }
+#else
+ for (i = 0; i < len; ++i)
+ {
+ if (value[i] == '\0')
+ {
+ while (i < len)
+ p[i++] = myBLANK;
+ break;
+ }
+ p[i] = value[i];
+ }
+#endif
+
+ if (buffer == 0)
+ {
+ int syncres;
+
+ if (((syncres = Synchronize_Field(field)) != E_OK) &&
+ (res == E_OK))
+ res = syncres;
+ if (((syncres = Synchronize_Linked_Fields(field)) != E_OK) &&
+ (res == E_OK))
+ res = syncres;
+ }
+ RETURN(res);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : char *field_buffer(const FIELD *field,int buffer)
+|
+| Description : Return the address of the buffer for the field.
+|
+| Return Values : Pointer to buffer or NULL if arguments were invalid.
++--------------------------------------------------------------------------*/
+NCURSES_EXPORT(char *)
+field_buffer(const FIELD *field, int buffer)
+{
+ char *result = 0;
+
+ T((T_CALLED("field_buffer(%p,%d)"), field, buffer));
+
+ if (field && (buffer >= 0) && (buffer <= field->nbuf))
+ {
+#if USE_WIDEC_SUPPORT
+ FIELD_CELL *data = Address_Of_Nth_Buffer(field, buffer);
+ unsigned need = 0;
+ int size = Buffer_Length(field);
+ int n;
+
+ /* determine the number of bytes needed to store the expanded string */
+ for (n = 0; n < size; ++n)
+ {
+ if (!isWidecExt(data[n]))
+ {
+ mbstate_t state;
+ size_t next;
+
+ init_mb(state);
+ next = _nc_wcrtomb(0, data[n].chars[0], &state);
+ if (!isEILSEQ(next))
+ need += next;
+ }
+ }
+
+ /* allocate a place to store the expanded string */
+ if (field->expanded[buffer] != 0)
+ free(field->expanded[buffer]);
+ field->expanded[buffer] = typeMalloc(char, need + 1);
+
+ /* expand the multibyte data */
+ if ((result = field->expanded[buffer]) != 0)
+ {
+ wclear(field->working);
+ mvwadd_wchnstr(field->working, 0, 0, data, size);
+ mvwinnstr(field->working, 0, 0, result, (int)need);
+ }
+#else
+ result = Address_Of_Nth_Buffer(field, buffer);
+#endif
+ }
+ returnPtr(result);
+}
+
+#if USE_WIDEC_SUPPORT
+
+/* FIXME: see lib_get_wch.c */
+#if HAVE_MBTOWC && HAVE_MBLEN
+#define reset_mbytes(state) mblen(NULL, 0), mbtowc(NULL, NULL, 0)
+#define count_mbytes(buffer,length,state) mblen(buffer,length)
+#define trans_mbytes(wch,buffer,length,state) \
+ (int) mbtowc(&wch, buffer, length)
+#elif HAVE_MBRTOWC && HAVE_MBRLEN
+#define NEED_STATE
+#define reset_mbytes(state) init_mb(state)
+#define count_mbytes(buffer,length,state) mbrlen(buffer,length,&state)
+#define trans_mbytes(wch,buffer,length,state) \
+ (int) mbrtowc(&wch, buffer, length, &state)
+#else
+make an error
+#endif
+
+/*---------------------------------------------------------------------------
+| Convert a multibyte string to a wide-character string. The result must be
+| freed by the caller.
++--------------------------------------------------------------------------*/
+NCURSES_EXPORT(wchar_t *)
+_nc_Widen_String(char *source, int *lengthp)
+{
+ wchar_t *result = 0;
+ wchar_t wch;
+ size_t given = strlen(source);
+ size_t tries;
+ int pass;
+ int status;
+
+#ifdef NEED_STATE
+ mbstate_t state;
+#endif
+
+ for (pass = 0; pass < 2; ++pass)
+ {
+ unsigned need = 0;
+ size_t passed = 0;
+
+ while (passed < given)
+ {
+ bool found = FALSE;
+
+ for (tries = 1, status = 0; tries <= (given - passed); ++tries)
+ {
+ int save = source[passed + tries];
+
+ source[passed + tries] = 0;
+ reset_mbytes(state);
+ status = trans_mbytes(wch, source + passed, tries, state);
+ source[passed + tries] = save;
+
+ if (status > 0)
+ {
+ found = TRUE;
+ break;
+ }
+ }
+ if (found)
+ {
+ if (pass)
+ {
+ result[need] = wch;
+ }
+ passed += status;
+ ++need;
+ }
+ else
+ {
+ if (pass)
+ {
+ result[need] = source[passed];
+ }
+ ++need;
+ ++passed;
+ }
+ }
+
+ if (!pass)
+ {
+ if (!need)
+ break;
+ result = typeCalloc(wchar_t, need);
+
+ *lengthp = need;
+ if (result == 0)
+ break;
+ }
+ }
+
+ return result;
+}
+#endif
+
+/* frm_driver.c ends here */