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-rw-r--r--form/frm_data.c193
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diff --git a/form/frm_data.c b/form/frm_data.c
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+/****************************************************************************
+ * Copyright (c) 1998-2004,2005 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_data.c,v 1.14 2005/11/26 15:34:01 tom Exp $")
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : bool data_behind(const FORM *form)
+|
+| Description : Check for off-screen data behind. This is nearly trivial
+| because the beginning of a field is fixed.
+|
+| Return Values : TRUE - there are off-screen data behind
+| FALSE - there are no off-screen data behind
++--------------------------------------------------------------------------*/
+NCURSES_EXPORT(bool)
+data_behind(const FORM *form)
+{
+ bool result = FALSE;
+
+ T((T_CALLED("data_behind(%p)"), form));
+
+ if (form && (form->status & _POSTED) && form->current)
+ {
+ FIELD *field;
+
+ field = form->current;
+ if (!Single_Line_Field(field))
+ {
+ result = (form->toprow == 0) ? FALSE : TRUE;
+ }
+ else
+ {
+ result = (form->begincol == 0) ? FALSE : TRUE;
+ }
+ }
+ returnBool(result);
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : static char * Only_Padding(
+| WINDOW *w,
+| int len,
+| int pad)
+|
+| Description : Test if 'length' cells starting at the current position
+| contain a padding character.
+|
+| Return Values : true if only padding cells are found
++--------------------------------------------------------------------------*/
+NCURSES_INLINE static bool
+Only_Padding(WINDOW *w, int len, int pad)
+{
+ bool result = TRUE;
+ int y, x, j;
+ FIELD_CELL cell;
+
+ getyx(w, y, x);
+ for (j = 0; j < len; ++j)
+ {
+ if (wmove(w, y, x + j) != ERR)
+ {
+#if USE_WIDEC_SUPPORT
+ if (win_wch(w, &cell) != ERR)
+ {
+ if ((chtype)CharOf(cell) != ChCharOf(pad)
+ || cell.chars[1] != 0)
+ {
+ result = FALSE;
+ break;
+ }
+ }
+#else
+ cell = winch(w);
+ if (ChCharOf(cell) != ChCharOf(pad))
+ {
+ result = FALSE;
+ break;
+ }
+#endif
+ }
+ else
+ {
+ /* if an error, return true: no non-padding text found */
+ break;
+ }
+ }
+ /* no need to reset the cursor position; caller does this */
+ return result;
+}
+
+/*---------------------------------------------------------------------------
+| Facility : libnform
+| Function : bool data_ahead(const FORM *form)
+|
+| Description : Check for off-screen data ahead. This is more difficult
+| because a dynamic field has a variable end.
+|
+| Return Values : TRUE - there are off-screen data ahead
+| FALSE - there are no off-screen data ahead
++--------------------------------------------------------------------------*/
+NCURSES_EXPORT(bool)
+data_ahead(const FORM *form)
+{
+ bool result = FALSE;
+
+ T((T_CALLED("data_ahead(%p)"), form));
+
+ if (form && (form->status & _POSTED) && form->current)
+ {
+ FIELD *field;
+ bool cursor_moved = FALSE;
+ int pos;
+
+ field = form->current;
+ assert(form->w);
+
+ if (Single_Line_Field(field))
+ {
+ int check_len;
+
+ pos = form->begincol + field->cols;
+ while (pos < field->dcols)
+ {
+ check_len = field->dcols - pos;
+ if (check_len >= field->cols)
+ check_len = field->cols;
+ cursor_moved = TRUE;
+ wmove(form->w, 0, pos);
+ if (Only_Padding(form->w, check_len, field->pad))
+ pos += field->cols;
+ else
+ {
+ result = TRUE;
+ break;
+ }
+ }
+ }
+ else
+ {
+ pos = form->toprow + field->rows;
+ while (pos < field->drows)
+ {
+ cursor_moved = TRUE;
+ wmove(form->w, pos, 0);
+ pos++;
+ if (!Only_Padding(form->w, field->cols, field->pad))
+ {
+ result = TRUE;
+ break;
+ }
+ }
+ }
+
+ if (cursor_moved)
+ wmove(form->w, form->currow, form->curcol);
+ }
+ returnBool(result);
+}
+
+/* frm_data.c ends here */