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diff --git a/ncurses/base/lib_pad.c b/ncurses/base/lib_pad.c
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+/****************************************************************************
+ * Copyright (c) 1998-2004,2006 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: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
+ * and: Eric S. Raymond <esr@snark.thyrsus.com> *
+ ****************************************************************************/
+
+/*
+ * lib_pad.c
+ * newpad -- create a new pad
+ * pnoutrefresh -- refresh a pad, no update
+ * pechochar -- add a char to a pad and refresh
+ */
+
+#include <curses.priv.h>
+
+MODULE_ID("$Id: lib_pad.c,v 1.41 2006/10/14 20:47:13 tom Exp $")
+
+NCURSES_EXPORT(WINDOW *)
+newpad(int l, int c)
+{
+ WINDOW *win;
+ NCURSES_CH_T *ptr;
+ int i;
+
+ T((T_CALLED("newpad(%d, %d)"), l, c));
+
+ if (l <= 0 || c <= 0)
+ returnWin(0);
+
+ if ((win = _nc_makenew(l, c, 0, 0, _ISPAD)) == NULL)
+ returnWin(0);
+
+ for (i = 0; i < l; i++) {
+ if_USE_SCROLL_HINTS(win->_line[i].oldindex = _NEWINDEX);
+ if ((win->_line[i].text = typeCalloc(NCURSES_CH_T, ((size_t) c))) == 0) {
+ (void) _nc_freewin(win);
+ returnWin(0);
+ }
+ for (ptr = win->_line[i].text; ptr < win->_line[i].text + c; ptr++)
+ SetChar(*ptr, BLANK_TEXT, BLANK_ATTR);
+ }
+
+ returnWin(win);
+}
+
+NCURSES_EXPORT(WINDOW *)
+subpad(WINDOW *orig, int l, int c, int begy, int begx)
+{
+ WINDOW *win = (WINDOW *) 0;
+
+ T((T_CALLED("subpad(%d, %d)"), l, c));
+
+ if (orig) {
+ if (!(orig->_flags & _ISPAD)
+ || ((win = derwin(orig, l, c, begy, begx)) == NULL))
+ returnWin(0);
+ }
+ returnWin(win);
+}
+
+NCURSES_EXPORT(int)
+prefresh(WINDOW *win,
+ int pminrow,
+ int pmincol,
+ int sminrow,
+ int smincol,
+ int smaxrow,
+ int smaxcol)
+{
+ T((T_CALLED("prefresh()")));
+ if (pnoutrefresh(win, pminrow, pmincol, sminrow, smincol, smaxrow,
+ smaxcol) != ERR
+ && doupdate() != ERR) {
+ returnCode(OK);
+ }
+ returnCode(ERR);
+}
+
+NCURSES_EXPORT(int)
+pnoutrefresh(WINDOW *win,
+ int pminrow,
+ int pmincol,
+ int sminrow,
+ int smincol,
+ int smaxrow,
+ int smaxcol)
+{
+ NCURSES_SIZE_T i, j;
+ NCURSES_SIZE_T m, n;
+ NCURSES_SIZE_T pmaxrow;
+ NCURSES_SIZE_T pmaxcol;
+
+#if USE_SCROLL_HINTS
+ const int my_len = 2; /* parameterize the threshold for hardscroll */
+ NCURSES_SIZE_T displaced;
+ bool wide;
+#endif
+
+ T((T_CALLED("pnoutrefresh(%p, %d, %d, %d, %d, %d, %d)"),
+ win, pminrow, pmincol, sminrow, smincol, smaxrow, smaxcol));
+
+ if (win == 0)
+ returnCode(ERR);
+
+ if (!(win->_flags & _ISPAD))
+ returnCode(ERR);
+
+ /* negative values are interpreted as zero */
+ if (pminrow < 0)
+ pminrow = 0;
+ if (pmincol < 0)
+ pmincol = 0;
+ if (sminrow < 0)
+ sminrow = 0;
+ if (smincol < 0)
+ smincol = 0;
+
+ pmaxrow = pminrow + smaxrow - sminrow;
+ pmaxcol = pmincol + smaxcol - smincol;
+
+ T((" pminrow + smaxrow - sminrow %ld, win->_maxy %ld",
+ (long) pmaxrow, (long) win->_maxy));
+ T((" pmincol + smaxcol - smincol %ld, win->_maxx %ld",
+ (long) pmaxcol, (long) win->_maxx));
+
+ /*
+ * Trim the caller's screen size back to the actual limits.
+ */
+ if (pmaxrow > win->_maxy) {
+ smaxrow -= (pmaxrow - win->_maxy);
+ pmaxrow = pminrow + smaxrow - sminrow;
+ }
+ if (pmaxcol > win->_maxx) {
+ smaxcol -= (pmaxcol - win->_maxx);
+ pmaxcol = pmincol + smaxcol - smincol;
+ }
+
+ if (smaxrow >= screen_lines
+ || smaxcol >= screen_columns
+ || sminrow > smaxrow
+ || smincol > smaxcol)
+ returnCode(ERR);
+
+ T(("pad being refreshed"));
+
+#if USE_SCROLL_HINTS
+ if (win->_pad._pad_y >= 0) {
+ displaced = pminrow - win->_pad._pad_y
+ - (sminrow - win->_pad._pad_top);
+ T(("pad being shifted by %d line(s)", displaced));
+ } else
+ displaced = 0;
+#endif
+
+ /*
+ * For pure efficiency, we'd want to transfer scrolling information
+ * from the pad to newscr whenever the window is wide enough that
+ * its update will dominate the cost of the update for the horizontal
+ * band of newscr that it occupies. Unfortunately, this threshold
+ * tends to be complex to estimate, and in any case scrolling the
+ * whole band and rewriting the parts outside win's image would look
+ * really ugly. So. What we do is consider the pad "wide" if it
+ * either (a) occupies the whole width of newscr, or (b) occupies
+ * all but at most one column on either vertical edge of the screen
+ * (this caters to fussy people who put boxes around full-screen
+ * windows). Note that changing this formula will not break any code,
+ * merely change the costs of various update cases.
+ */
+#if USE_SCROLL_HINTS
+ wide = (smincol < my_len && smaxcol > (newscr->_maxx - my_len));
+#endif
+
+ for (i = pminrow, m = sminrow + win->_yoffset;
+ i <= pmaxrow && m <= newscr->_maxy;
+ i++, m++) {
+ register struct ldat *nline = &newscr->_line[m];
+ register struct ldat *oline = &win->_line[i];
+ for (j = pmincol, n = smincol; j <= pmaxcol; j++, n++) {
+ NCURSES_CH_T ch = oline->text[j];
+#if USE_WIDEC_SUPPORT
+ /*
+ * Special case for leftmost character of the displayed area.
+ * Only half of a double-width character may be visible.
+ */
+ if (j == pmincol
+ && j > 0
+ && isWidecExt(ch)) {
+ SetChar(ch, L(' '), AttrOf(oline->text[j - 1]));
+ }
+#endif
+ if (!CharEq(ch, nline->text[n])) {
+ nline->text[n] = ch;
+ CHANGED_CELL(nline, n);
+ }
+ }
+
+#if USE_SCROLL_HINTS
+ if (wide) {
+ int nind = m + displaced;
+ if (oline->oldindex < 0
+ || nind < sminrow
+ || nind > smaxrow) {
+ nind = _NEWINDEX;
+ } else if (displaced) {
+ register struct ldat *pline = &curscr->_line[nind];
+ for (j = 0; j <= my_len; j++) {
+ int k = newscr->_maxx - j;
+ if (pline->text[j] != nline->text[j]
+ || pline->text[k] != nline->text[k]) {
+ nind = _NEWINDEX;
+ break;
+ }
+ }
+ }
+
+ nline->oldindex = nind;
+ }
+#endif /* USE_SCROLL_HINTS */
+ oline->firstchar = oline->lastchar = _NOCHANGE;
+ if_USE_SCROLL_HINTS(oline->oldindex = i);
+ }
+
+ /*
+ * Clean up debris from scrolling or resizing the pad, so we do not
+ * accidentally pick up the index value during the next call to this
+ * procedure. The only rows that should have an index value are those
+ * that are displayed during this cycle.
+ */
+#if USE_SCROLL_HINTS
+ for (i = pminrow - 1; (i >= 0) && (win->_line[i].oldindex >= 0); i--)
+ win->_line[i].oldindex = _NEWINDEX;
+ for (i = pmaxrow + 1; (i <= win->_maxy)
+ && (win->_line[i].oldindex >= 0); i++)
+ win->_line[i].oldindex = _NEWINDEX;
+#endif
+
+ win->_begx = smincol;
+ win->_begy = sminrow;
+
+ if (win->_clear) {
+ win->_clear = FALSE;
+ newscr->_clear = TRUE;
+ }
+
+ /*
+ * Use the pad's current position, if it will be visible.
+ * If not, don't do anything; it's not an error.
+ */
+ if (win->_leaveok == FALSE
+ && win->_cury >= pminrow
+ && win->_curx >= pmincol
+ && win->_cury <= pmaxrow
+ && win->_curx <= pmaxcol) {
+ newscr->_cury = win->_cury - pminrow + win->_begy + win->_yoffset;
+ newscr->_curx = win->_curx - pmincol + win->_begx;
+ }
+ newscr->_leaveok = win->_leaveok;
+ win->_flags &= ~_HASMOVED;
+
+ /*
+ * Update our cache of the line-numbers that we displayed from the pad.
+ * We will use this on subsequent calls to this function to derive
+ * values to stuff into 'oldindex[]' -- for scrolling optimization.
+ */
+ win->_pad._pad_y = pminrow;
+ win->_pad._pad_x = pmincol;
+ win->_pad._pad_top = sminrow;
+ win->_pad._pad_left = smincol;
+ win->_pad._pad_bottom = smaxrow;
+ win->_pad._pad_right = smaxcol;
+
+ returnCode(OK);
+}
+
+NCURSES_EXPORT(int)
+pechochar(WINDOW *pad, const chtype ch)
+{
+ T((T_CALLED("pechochar(%p, %s)"), pad, _tracechtype(ch)));
+
+ if (pad == 0)
+ returnCode(ERR);
+
+ if (!(pad->_flags & _ISPAD))
+ returnCode(wechochar(pad, ch));
+
+ waddch(pad, ch);
+ prefresh(pad, pad->_pad._pad_y,
+ pad->_pad._pad_x,
+ pad->_pad._pad_top,
+ pad->_pad._pad_left,
+ pad->_pad._pad_bottom,
+ pad->_pad._pad_right);
+
+ returnCode(OK);
+}