ncurses/wresize.c

   1 /****************************************************************************
   2  * Copyright (c) 1998 Free Software Foundation, Inc.                        *
   3  *                                                                          *
   4  * Permission is hereby granted, free of charge, to any person obtaining a  *
   5  * copy of this software and associated documentation files (the            *
   6  * "Software"), to deal in the Software without restriction, including      *
   7  * without limitation the rights to use, copy, modify, merge, publish,      *
   8  * distribute, distribute with modifications, sublicense, and/or sell       *
   9  * copies of the Software, and to permit persons to whom the Software is    *
  10  * furnished to do so, subject to the following conditions:                 *
  11  *                                                                          *
  12  * The above copyright notice and this permission notice shall be included  *
  13  * in all copies or substantial portions of the Software.                   *
  14  *                                                                          *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  18  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
  21  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
  22  *                                                                          *
  23  * Except as contained in this notice, the name(s) of the above copyright   *
  24  * holders shall not be used in advertising or otherwise to promote the     *
  25  * sale, use or other dealings in this Software without prior written       *
  26  * authorization.                                                           *
  27  ****************************************************************************/
  28
  29 /****************************************************************************
  30  *  Author: Thomas E. Dickey <dickey@clark.net> 1996,1997                   *
  31  ****************************************************************************/
  32
  33 #include <curses.priv.h>
  34 #include <term.h>
  35
  36 MODULE_ID("$Id: wresize.c,v 1.9 1998/02/11 12:13:54 tom Exp $")
  37
  38 /*
  39  * Reallocate a curses WINDOW struct to either shrink or grow to the specified
  40  * new lines/columns.  If it grows, the new character cells are filled with
  41  * blanks.  The application is responsible for repainting the blank area.
  42  */
  43
  44 static void *doalloc(void *p, size_t n)
  45 {
  46         if (p == 0)
  47                 p = malloc(n);
  48         else
  49                 p = realloc(p, n);
  50         return p;
  51 }
  52
  53 #define DOALLOC(p,t,n)  (t *)doalloc(p, sizeof(t)*(n))
  54 #define ld_ALLOC(p,n)   DOALLOC(p,struct ldat,n)
  55 #define c_ALLOC(p,n)    DOALLOC(p,chtype,n)
  56
  57 int
  58 wresize(WINDOW *win, int ToLines, int ToCols)
  59 {
  60         register int row;
  61         int size_x, size_y;
  62         struct ldat *pline;
  63         chtype blank;
  64
  65 #ifdef TRACE
  66         T((T_CALLED("wresize(%p,%d,%d)"), win, ToLines, ToCols));
  67         if (win) {
  68           TR(TRACE_UPDATE, ("...beg (%d, %d), max(%d,%d), reg(%d,%d)",
  69                             win->_begy, win->_begx,
  70                             win->_maxy, win->_maxx,
  71                             win->_regtop, win->_regbottom));
  72           if (_nc_tracing & TRACE_UPDATE)
  73             _tracedump("...before", win);
  74         }
  75 #endif
  76
  77         if (!win || --ToLines < 0 || --ToCols < 0)
  78                 returnCode(ERR);
  79
  80         size_x = win->_maxx;
  81         size_y = win->_maxy;
  82
  83         if (ToLines == size_y
  84          && ToCols  == size_x)
  85                 returnCode(OK);
  86
  87         pline  = (win->_flags & _SUBWIN) ? win->_parent->_line : 0;
  88
  89         /*
  90          * If the number of lines has changed, adjust the size of the overall
  91          * vector:
  92          */
  93         if (ToLines != size_y) {
  94                 if (! (win->_flags & _SUBWIN)) {
  95                         for (row = ToLines+1; row <= size_y; row++)
  96                                 free((char *)(win->_line[row].text));
  97                 }
  98
  99                 win->_line = ld_ALLOC(win->_line, ToLines+1);
 100                 if (win->_line == 0)
 101                         returnCode(ERR);
 102
 103                 for (row = size_y+1; row <= ToLines; row++) {
 104                         win->_line[row].text      = 0;
 105                         win->_line[row].firstchar = 0;
 106                         win->_line[row].lastchar  = ToCols;
 107                         if ((win->_flags & _SUBWIN)) {
 108                                 win->_line[row].text =
 109                                 &pline[win->_begy + row].text[win->_begx];
 110                         }
 111                 }
 112         }
 113
 114         /*
 115          * Adjust the width of the columns:
 116          */
 117         blank = _nc_background(win);
 118         for (row = 0; row <= ToLines; row++) {
 119                 chtype  *s      = win->_line[row].text;
 120                 int     begin   = (s == 0) ? 0 : size_x + 1;
 121                 int     end     = ToCols;
 122
 123                 if_USE_SCROLL_HINTS(win->_line[row].oldindex = row);
 124
 125                 if (ToCols != size_x || s == 0) {
 126                         if (! (win->_flags & _SUBWIN)) {
 127                                 win->_line[row].text = s = c_ALLOC(s, ToCols+1);
 128                                 if (win->_line[row].text == 0)
 129                                         returnCode(ERR);
 130                         } else if (s == 0) {
 131                                 win->_line[row].text = s =
 132                                 &pline[win->_begy + row].text[win->_begx];
 133                         }
 134
 135                         if (end >= begin) {     /* growing */
 136                                 if (win->_line[row].firstchar < begin)
 137                                         win->_line[row].firstchar = begin;
 138                                 win->_line[row].lastchar = ToCols;
 139                                 do {
 140                                         s[end] = blank;
 141                                 } while (--end >= begin);
 142                         } else {                /* shrinking */
 143                                 win->_line[row].firstchar = 0;
 144                                 win->_line[row].lastchar  = ToCols;
 145                         }
 146                 }
 147         }
 148
 149         /*
 150          * Finally, adjust the parameters showing screen size and cursor
 151          * position:
 152          */
 153         win->_maxx = ToCols;
 154         win->_maxy = ToLines;
 155
 156         if (win->_regtop > win->_maxy)
 157                 win->_regtop = win->_maxy;
 158         if (win->_regbottom > win->_maxy
 159          || win->_regbottom == size_y)
 160                 win->_regbottom = win->_maxy;
 161
 162         if (win->_curx > win->_maxx)
 163                 win->_curx = win->_maxx;
 164         if (win->_cury > win->_maxy)
 165                 win->_cury = win->_maxy;
 166
 167 #ifdef TRACE
 168         TR(TRACE_UPDATE, ("...beg (%d, %d), max(%d,%d), reg(%d,%d)",
 169                 win->_begy, win->_begx,
 170                 win->_maxy, win->_maxx,
 171                 win->_regtop, win->_regbottom));
 172         if (_nc_tracing & TRACE_UPDATE)
 173                 _tracedump("...after:", win);
 174 #endif
 175         returnCode(OK);
 176 }