ncurses/wresize.c

   1 /******************************************************************************
   2  * Copyright 1996,1997 by Thomas E. Dickey <dickey@clark.net>                 *
   3  * All Rights Reserved.                                                       *
   4  *                                                                            *
   5  * Permission to use, copy, modify, and distribute this software and its      *
   6  * documentation for any purpose and without fee is hereby granted, provided  *
   7  * that the above copyright notice appear in all copies and that both that    *
   8  * copyright notice and this permission notice appear in supporting           *
   9  * documentation, and that the name of the above listed copyright holder(s)   *
  10  * not be used in advertising or publicity pertaining to distribution of the  *
  11  * software without specific, written prior permission. THE ABOVE LISTED      *
  12  * COPYRIGHT HOLDER(S) DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,  *
  13  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO     *
  14  * EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY         *
  15  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER       *
  16  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF       *
  17  * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN        *
  18  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.                   *
  19  ******************************************************************************/
  20
  21 #include <curses.priv.h>
  22 #include <term.h>
  23
  24 MODULE_ID("$Id: wresize.c,v 1.5 1997/02/01 23:22:54 tom Exp $")
  25
  26 /*
  27  * Reallocate a curses WINDOW struct to either shrink or grow to the specified
  28  * new lines/columns.  If it grows, the new character cells are filled with
  29  * blanks.  The application is responsible for repainting the blank area.
  30  */
  31
  32 static void *doalloc(void *p, size_t n)
  33 {
  34         if (p == 0)
  35                 p = malloc(n);
  36         else
  37                 p = realloc(p, n);
  38         return p;
  39 }
  40
  41 #define DOALLOC(p,t,n)  (t *)doalloc(p, sizeof(t)*(n))
  42 #define ld_ALLOC(p,n)   DOALLOC(p,struct ldat,n)
  43 #define c_ALLOC(p,n)    DOALLOC(p,chtype,n)
  44
  45 int
  46 wresize(WINDOW *win, int ToLines, int ToCols)
  47 {
  48         register int    row;
  49         int     size_x, size_y;
  50         struct ldat *pline = (win->_flags & _SUBWIN) ? win->_parent->_line : 0;
  51
  52 #ifdef TRACE
  53         T((T_CALLED("wresize(%p,%d,%d)"), win, ToLines, ToCols));
  54         TR(TRACE_UPDATE, ("...beg (%d, %d), max(%d,%d), reg(%d,%d)",
  55                 win->_begy, win->_begx,
  56                 win->_maxy, win->_maxx,
  57                 win->_regtop, win->_regbottom));
  58         if (_nc_tracing & TRACE_UPDATE)
  59                 _tracedump("...before", win);
  60 #endif
  61
  62         if (--ToLines < 0 || --ToCols < 0)
  63                 returnCode(ERR);
  64
  65         size_x = win->_maxx;
  66         size_y = win->_maxy;
  67
  68         if (ToLines == size_y
  69          && ToCols  == size_x)
  70                 returnCode(OK);
  71
  72         /*
  73          * If the number of lines has changed, adjust the size of the overall
  74          * vector:
  75          */
  76         if (ToLines != size_y) {
  77                 if (! (win->_flags & _SUBWIN)) {
  78                         for (row = ToLines+1; row <= size_y; row++)
  79                                 free((char *)(win->_line[row].text));
  80                 }
  81
  82                 win->_line = ld_ALLOC(win->_line, ToLines+1);
  83                 if (win->_line == 0)
  84                         returnCode(ERR);
  85
  86                 for (row = size_y+1; row <= ToLines; row++) {
  87                         win->_line[row].text      = 0;
  88                         win->_line[row].firstchar = 0;
  89                         win->_line[row].lastchar  = ToCols;
  90                         if ((win->_flags & _SUBWIN)) {
  91                                 win->_line[row].text =
  92                                 &pline[win->_begy + row].text[win->_begx];
  93                         }
  94                 }
  95         }
  96
  97         /*
  98          * Adjust the width of the columns:
  99          */
 100         for (row = 0; row <= ToLines; row++) {
 101                 chtype  *s      = win->_line[row].text;
 102                 int     begin   = (s == 0) ? 0 : size_x + 1;
 103                 int     end     = ToCols;
 104                 chtype  blank   = _nc_background(win);
 105
 106                 win->_line[row].oldindex = row;
 107
 108                 if (ToCols != size_x || s == 0) {
 109                         if (! (win->_flags & _SUBWIN)) {
 110                                 win->_line[row].text = s = c_ALLOC(s, ToCols+1);
 111                                 if (win->_line[row].text == 0)
 112                                         returnCode(ERR);
 113                         } else if (s == 0) {
 114                                 win->_line[row].text = s =
 115                                 &pline[win->_begy + row].text[win->_begx];
 116                         }
 117
 118                         if (end >= begin) {     /* growing */
 119                                 if (win->_line[row].firstchar < begin)
 120                                         win->_line[row].firstchar = begin;
 121                                 win->_line[row].lastchar = ToCols;
 122                                 do {
 123                                         s[end] = blank;
 124                                 } while (--end >= begin);
 125                         } else {                /* shrinking */
 126                                 win->_line[row].firstchar = 0;
 127                                 win->_line[row].lastchar  = ToCols;
 128                         }
 129                 }
 130         }
 131
 132         /*
 133          * Finally, adjust the parameters showing screen size and cursor
 134          * position:
 135          */
 136         win->_maxx = ToCols;
 137         win->_maxy = ToLines;
 138
 139         if (win->_regtop > win->_maxy)
 140                 win->_regtop = win->_maxy;
 141         if (win->_regbottom > win->_maxy
 142          || win->_regbottom == size_y)
 143                 win->_regbottom = win->_maxy;
 144
 145         if (win->_curx > win->_maxx)
 146                 win->_curx = win->_maxx;
 147         if (win->_cury > win->_maxy)
 148                 win->_cury = win->_maxy;
 149
 150 #ifdef TRACE
 151         TR(TRACE_UPDATE, ("...beg (%d, %d), max(%d,%d), reg(%d,%d)",
 152                 win->_begy, win->_begx,
 153                 win->_maxy, win->_maxx,
 154                 win->_regtop, win->_regbottom));
 155         if (_nc_tracing & TRACE_UPDATE)
 156                 _tracedump("...after:", win);
 157 #endif
 158         returnCode(OK);
 159 }