ncurses 5.6
[ncurses.git] / ncurses / base / wresize.c
index 1b91476cbfd3dbced32d97e6943597da5f50752c..ca6336dc94b5d2d14a10d153a2c87190e9007075 100644 (file)
@@ -1,5 +1,5 @@
 /****************************************************************************
- * Copyright (c) 1998 Free Software Foundation, Inc.                        *
+ * Copyright (c) 1998-2002,2006 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            *
  ****************************************************************************/
 
 /****************************************************************************
- *  Author: Thomas E. Dickey <dickey@clark.net> 1996,1997                   *
+ *  Author: Thomas E. Dickey 1996-2002                                      *
  ****************************************************************************/
 
 #include <curses.priv.h>
 
-MODULE_ID("$Id: wresize.c,v 1.12 1999/02/27 18:57:31 tom Exp $")
+MODULE_ID("$Id: wresize.c,v 1.24 2006/10/14 20:43:31 tom Exp $")
+
+static int
+cleanup_lines(struct ldat *data, int length)
+{
+    while (--length >= 0)
+       free(data->text);
+    free(data);
+    return ERR;
+}
+
+/*
+ * If we have reallocated the ldat structs, we will have to repair pointers
+ * used in subwindows.
+ */
+static void
+repair_subwindows(WINDOW *cmp)
+{
+    WINDOWLIST *wp;
+    struct ldat *pline = cmp->_line;
+    int row;
+
+    for (wp = _nc_windows; wp != 0; wp = wp->next) {
+       WINDOW *tst = &(wp->win);
+
+       if (tst->_parent == cmp) {
+
+           if (tst->_pary > cmp->_maxy)
+               tst->_pary = cmp->_maxy;
+           if (tst->_parx > cmp->_maxx)
+               tst->_parx = cmp->_maxx;
+
+           if (tst->_maxy + tst->_pary > cmp->_maxy)
+               tst->_maxy = cmp->_maxy - tst->_pary;
+           if (tst->_maxx + tst->_parx > cmp->_maxx)
+               tst->_maxx = cmp->_maxx - tst->_parx;
+
+           for (row = 0; row <= tst->_maxy; ++row) {
+               tst->_line[row].text = &pline[tst->_pary + row].text[tst->_parx];
+           }
+           repair_subwindows(tst);
+       }
+    }
+}
 
 /*
  * Reallocate a curses WINDOW struct to either shrink or grow to the specified
  * new lines/columns.  If it grows, the new character cells are filled with
  * blanks.  The application is responsible for repainting the blank area.
  */
-
-#define DOALLOC(p,t,n)  typeRealloc(t, n, p)
-#define        ld_ALLOC(p,n)   DOALLOC(p,struct ldat,n)
-#define        c_ALLOC(p,n)    DOALLOC(p,chtype,n)
-
-int
+NCURSES_EXPORT(int)
 wresize(WINDOW *win, int ToLines, int ToCols)
 {
-       register int row;
-       int size_x, size_y;
-       struct ldat *pline;
-       chtype blank;
+    int col, row, size_x, size_y;
+    struct ldat *pline;
+    struct ldat *new_lines = 0;
 
 #ifdef TRACE
-       T((T_CALLED("wresize(%p,%d,%d)"), win, ToLines, ToCols));
-       if (win) {
-         TR(TRACE_UPDATE, ("...beg (%d, %d), max(%d,%d), reg(%d,%d)",
-                           win->_begy, win->_begx,
-                           win->_maxy, win->_maxx,
-                           win->_regtop, win->_regbottom));
-         if (_nc_tracing & TRACE_UPDATE)
+    T((T_CALLED("wresize(%p,%d,%d)"), win, ToLines, ToCols));
+    if (win) {
+       TR(TRACE_UPDATE, ("...beg (%ld, %ld), max(%ld,%ld), reg(%ld,%ld)",
+                         (long) win->_begy, (long) win->_begx,
+                         (long) win->_maxy, (long) win->_maxx,
+                         (long) win->_regtop, (long) win->_regbottom));
+       if (_nc_tracing & TRACE_UPDATE)
            _tracedump("...before", win);
-       }
+    }
 #endif
 
-       if (!win || --ToLines < 0 || --ToCols < 0)
-               returnCode(ERR);
+    if (!win || --ToLines < 0 || --ToCols < 0)
+       returnCode(ERR);
 
-       size_x = win->_maxx;
-       size_y = win->_maxy;
+    size_x = win->_maxx;
+    size_y = win->_maxy;
 
-       if (ToLines == size_y
-        && ToCols  == size_x)
-               returnCode(OK);
-
-       pline  = (win->_flags & _SUBWIN) ? win->_parent->_line : 0;
+    if (ToLines == size_y
+       && ToCols == size_x)
+       returnCode(OK);
 
+    if ((win->_flags & _SUBWIN)) {
        /*
-        * If the number of lines has changed, adjust the size of the overall
-        * vector:
+        * Check if the new limits will fit into the parent window's size.  If
+        * not, do not resize.  We could adjust the location of the subwindow,
+        * but the application may not like that.
         */
-       if (ToLines != size_y) {
-               if (! (win->_flags & _SUBWIN)) {
-                       for (row = ToLines+1; row <= size_y; row++)
-                               free((char *)(win->_line[row].text));
-               }
-
-               win->_line = ld_ALLOC(win->_line, ToLines+1);
-               if (win->_line == 0)
-                       returnCode(ERR);
-
-               for (row = size_y+1; row <= ToLines; row++) {
-                       win->_line[row].text      = 0;
-                       win->_line[row].firstchar = 0;
-                       win->_line[row].lastchar  = ToCols;
-                       if ((win->_flags & _SUBWIN)) {
-                               win->_line[row].text =
-                               &pline[win->_begy + row].text[win->_begx];
-                       }
-               }
+       if (win->_pary + ToLines > win->_parent->_maxy
+           || win->_parx + ToCols > win->_parent->_maxx) {
+           returnCode(ERR);
        }
-
-       /*
-        * Adjust the width of the columns:
-        */
-       blank = _nc_background(win);
-       for (row = 0; row <= ToLines; row++) {
-               chtype  *s      = win->_line[row].text;
-               int     begin   = (s == 0) ? 0 : size_x + 1;
-               int     end     = ToCols;
-
-               if_USE_SCROLL_HINTS(win->_line[row].oldindex = row);
-
-               if (ToCols != size_x || s == 0) {
-                       if (! (win->_flags & _SUBWIN)) {
-                               win->_line[row].text = s = c_ALLOC(s, ToCols+1);
-                               if (win->_line[row].text == 0)
-                                       returnCode(ERR);
-                       } else if (s == 0) {
-                               win->_line[row].text = s =
-                               &pline[win->_begy + row].text[win->_begx];
-                       }
-
-                       if (end >= begin) {     /* growing */
-                               if (win->_line[row].firstchar < begin)
-                                       win->_line[row].firstchar = begin;
-                               win->_line[row].lastchar = ToCols;
-                               do {
-                                       s[end] = blank;
-                               } while (--end >= begin);
-                       } else {                /* shrinking */
-                               win->_line[row].firstchar = 0;
-                               win->_line[row].lastchar  = ToCols;
-                       }
+       pline = win->_parent->_line;
+    } else {
+       pline = 0;
+    }
+
+    /*
+     * Allocate new memory as needed.  Do the allocations without modifying
+     * the original window, in case an allocation fails.  Always allocate
+     * (at least temporarily) the array pointing to the individual lines.
+     */
+    new_lines = typeCalloc(struct ldat, (unsigned) (ToLines + 1));
+    if (new_lines == 0)
+       returnCode(ERR);
+
+    /*
+     * For each line in the target, allocate or adjust pointers for the
+     * corresponding text, depending on whether this is a window or a
+     * subwindow.
+     */
+    for (row = 0; row <= ToLines; ++row) {
+       int begin = (row > size_y) ? 0 : (size_x + 1);
+       int end = ToCols;
+       NCURSES_CH_T *s;
+
+       if (!(win->_flags & _SUBWIN)) {
+           if (row <= size_y) {
+               if (ToCols != size_x) {
+                   if ((s = typeMalloc(NCURSES_CH_T, ToCols + 1)) == 0)
+                       returnCode(cleanup_lines(new_lines, row));
+                   for (col = 0; col <= ToCols; ++col) {
+                       s[col] = (col <= size_x
+                                 ? win->_line[row].text[col]
+                                 : win->_nc_bkgd);
+                   }
+               } else {
+                   s = win->_line[row].text;
                }
+           } else {
+               if ((s = typeMalloc(NCURSES_CH_T, ToCols + 1)) == 0)
+                   returnCode(cleanup_lines(new_lines, row));
+               for (col = 0; col <= ToCols; ++col)
+                   s[col] = win->_nc_bkgd;
+           }
+       } else {
+           s = &pline[win->_pary + row].text[win->_parx];
        }
 
-       /*
-        * Finally, adjust the parameters showing screen size and cursor
-        * position:
-        */
-       win->_maxx = ToCols;
-       win->_maxy = ToLines;
-
-       if (win->_regtop > win->_maxy)
-               win->_regtop = win->_maxy;
-       if (win->_regbottom > win->_maxy
-        || win->_regbottom == size_y)
-               win->_regbottom = win->_maxy;
-
-       if (win->_curx > win->_maxx)
-               win->_curx = win->_maxx;
-       if (win->_cury > win->_maxy)
-               win->_cury = win->_maxy;
+       if_USE_SCROLL_HINTS(new_lines[row].oldindex = row);
+       if (row <= size_y) {
+           new_lines[row].firstchar = win->_line[row].firstchar;
+           new_lines[row].lastchar = win->_line[row].lastchar;
+       }
+       if ((ToCols != size_x) || (row > size_y)) {
+           if (end >= begin) { /* growing */
+               if (new_lines[row].firstchar < begin)
+                   new_lines[row].firstchar = begin;
+           } else {            /* shrinking */
+               new_lines[row].firstchar = 0;
+           }
+           new_lines[row].lastchar = ToCols;
+       }
+       new_lines[row].text = s;
+    }
+
+    /*
+     * Dispose of unwanted memory.
+     */
+    if (!(win->_flags & _SUBWIN)) {
+       if (ToCols == size_x) {
+           for (row = ToLines + 1; row <= size_y; row++) {
+               free(win->_line[row].text);
+           }
+       } else {
+           for (row = 0; row <= size_y; row++) {
+               free(win->_line[row].text);
+           }
+       }
+    }
+
+    free(win->_line);
+    win->_line = new_lines;
+
+    /*
+     * Finally, adjust the parameters showing screen size and cursor
+     * position:
+     */
+    win->_maxx = ToCols;
+    win->_maxy = ToLines;
+
+    if (win->_regtop > win->_maxy)
+       win->_regtop = win->_maxy;
+    if (win->_regbottom > win->_maxy
+       || win->_regbottom == size_y)
+       win->_regbottom = win->_maxy;
+
+    if (win->_curx > win->_maxx)
+       win->_curx = win->_maxx;
+    if (win->_cury > win->_maxy)
+       win->_cury = win->_maxy;
+
+    /*
+     * Check for subwindows of this one, and readjust pointers to our text,
+     * if needed.
+     */
+    repair_subwindows(win);
 
 #ifdef TRACE
-       TR(TRACE_UPDATE, ("...beg (%d, %d), max(%d,%d), reg(%d,%d)",
-               win->_begy, win->_begx,
-               win->_maxy, win->_maxx,
-               win->_regtop, win->_regbottom));
-       if (_nc_tracing & TRACE_UPDATE)
-               _tracedump("...after:", win);
+    TR(TRACE_UPDATE, ("...beg (%ld, %ld), max(%ld,%ld), reg(%ld,%ld)",
+                     (long) win->_begy, (long) win->_begx,
+                     (long) win->_maxy, (long) win->_maxx,
+                     (long) win->_regtop, (long) win->_regbottom));
+    if (_nc_tracing & TRACE_UPDATE)
+       _tracedump("...after:", win);
 #endif
-       returnCode(OK);
+    returnCode(OK);
 }