release/src/router/libncurses/ncurses/base/wresize.c

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  28
  29 /****************************************************************************
  30  *  Author: Thomas E. Dickey 1996-on                                        *
  31  *     and: Juergen Pfeifer                                                 *
  32  ****************************************************************************/
  33
  34 #include <curses.priv.h>
  35
  36 MODULE_ID("$Id: wresize.c,v 1.35 2011/05/21 18:55:07 tom Exp $")
  37
  38 static int
  39 cleanup_lines(struct ldat *data, int length)
  40 {
  41     while (--length >= 0)
  42         free(data[length].text);
  43     free(data);
  44     return ERR;
  45 }
  46
  47 /*
  48  * If we have reallocated the ldat structs, we will have to repair pointers
  49  * used in subwindows.
  50  */
  51 static void
  52 repair_subwindows(WINDOW *cmp)
  53 {
  54     WINDOWLIST *wp;
  55     struct ldat *pline = cmp->_line;
  56     int row;
  57 #ifdef USE_SP_WINDOWLIST
  58     SCREEN *sp = _nc_screen_of(cmp);
  59 #endif
  60
  61     _nc_lock_global(curses);
  62
  63     for (each_window(SP_PARM, wp)) {
  64         WINDOW *tst = &(wp->win);
  65
  66         if (tst->_parent == cmp) {
  67
  68             if (tst->_pary > cmp->_maxy)
  69                 tst->_pary = cmp->_maxy;
  70             if (tst->_parx > cmp->_maxx)
  71                 tst->_parx = cmp->_maxx;
  72
  73             if (tst->_maxy + tst->_pary > cmp->_maxy)
  74                 tst->_maxy = (NCURSES_SIZE_T) (cmp->_maxy - tst->_pary);
  75             if (tst->_maxx + tst->_parx > cmp->_maxx)
  76                 tst->_maxx = (NCURSES_SIZE_T) (cmp->_maxx - tst->_parx);
  77
  78             for (row = 0; row <= tst->_maxy; ++row) {
  79                 tst->_line[row].text = &pline[tst->_pary + row].text[tst->_parx];
  80             }
  81             repair_subwindows(tst);
  82         }
  83     }
  84     _nc_unlock_global(curses);
  85 }
  86
  87 /*
  88  * Reallocate a curses WINDOW struct to either shrink or grow to the specified
  89  * new lines/columns.  If it grows, the new character cells are filled with
  90  * blanks.  The application is responsible for repainting the blank area.
  91  */
  92 NCURSES_EXPORT(int)
  93 wresize(WINDOW *win, int ToLines, int ToCols)
  94 {
  95     int col, row, size_x, size_y;
  96     struct ldat *pline;
  97     struct ldat *new_lines = 0;
  98
  99 #ifdef TRACE
 100     T((T_CALLED("wresize(%p,%d,%d)"), (void *) win, ToLines, ToCols));
 101     if (win) {
 102         TR(TRACE_UPDATE, ("...beg (%ld, %ld), max(%ld,%ld), reg(%ld,%ld)",
 103                           (long) win->_begy, (long) win->_begx,
 104                           (long) win->_maxy, (long) win->_maxx,
 105                           (long) win->_regtop, (long) win->_regbottom));
 106         if (USE_TRACEF(TRACE_UPDATE)) {
 107             _tracedump("...before", win);
 108             _nc_unlock_global(tracef);
 109         }
 110     }
 111 #endif
 112
 113     if (!win || --ToLines < 0 || --ToCols < 0)
 114         returnCode(ERR);
 115
 116     size_x = win->_maxx;
 117     size_y = win->_maxy;
 118
 119     if (ToLines == size_y
 120         && ToCols == size_x)
 121         returnCode(OK);
 122
 123     if ((win->_flags & _SUBWIN)) {
 124         /*
 125          * Check if the new limits will fit into the parent window's size.  If
 126          * not, do not resize.  We could adjust the location of the subwindow,
 127          * but the application may not like that.
 128          */
 129         if (win->_pary + ToLines > win->_parent->_maxy
 130             || win->_parx + ToCols > win->_parent->_maxx) {
 131             returnCode(ERR);
 132         }
 133         pline = win->_parent->_line;
 134     } else {
 135         pline = 0;
 136     }
 137
 138     /*
 139      * Allocate new memory as needed.  Do the allocations without modifying
 140      * the original window, in case an allocation fails.  Always allocate
 141      * (at least temporarily) the array pointing to the individual lines.
 142      */
 143     new_lines = typeCalloc(struct ldat, (unsigned) (ToLines + 1));
 144     if (new_lines == 0)
 145         returnCode(ERR);
 146
 147     /*
 148      * For each line in the target, allocate or adjust pointers for the
 149      * corresponding text, depending on whether this is a window or a
 150      * subwindow.
 151      */
 152     for (row = 0; row <= ToLines; ++row) {
 153         int begin = (row > size_y) ? 0 : (size_x + 1);
 154         int end = ToCols;
 155         NCURSES_CH_T *s;
 156
 157         if (!(win->_flags & _SUBWIN)) {
 158             if (row <= size_y) {
 159                 if (ToCols != size_x) {
 160                     s = typeMalloc(NCURSES_CH_T, (unsigned) ToCols + 1);
 161                     if (s == 0)
 162                         returnCode(cleanup_lines(new_lines, row));
 163                     for (col = 0; col <= ToCols; ++col) {
 164                         s[col] = (col <= size_x
 165                                   ? win->_line[row].text[col]
 166                                   : win->_nc_bkgd);
 167                     }
 168                 } else {
 169                     s = win->_line[row].text;
 170                 }
 171             } else {
 172                 s = typeMalloc(NCURSES_CH_T, (unsigned) ToCols + 1);
 173                 if (s == 0)
 174                     returnCode(cleanup_lines(new_lines, row));
 175                 for (col = 0; col <= ToCols; ++col)
 176                     s[col] = win->_nc_bkgd;
 177             }
 178         } else if (pline != 0 && pline[win->_pary + row].text != 0) {
 179             s = &pline[win->_pary + row].text[win->_parx];
 180         } else {
 181             s = 0;
 182         }
 183
 184         if_USE_SCROLL_HINTS(new_lines[row].oldindex = row);
 185         if (row <= size_y) {
 186             new_lines[row].firstchar = win->_line[row].firstchar;
 187             new_lines[row].lastchar = win->_line[row].lastchar;
 188         }
 189         if ((ToCols != size_x) || (row > size_y)) {
 190             if (end >= begin) { /* growing */
 191                 if (new_lines[row].firstchar < begin)
 192                     new_lines[row].firstchar = (NCURSES_SIZE_T) begin;
 193             } else {            /* shrinking */
 194                 new_lines[row].firstchar = 0;
 195             }
 196             new_lines[row].lastchar = (NCURSES_SIZE_T) ToCols;
 197         }
 198         new_lines[row].text = s;
 199     }
 200
 201     /*
 202      * Dispose of unwanted memory.
 203      */
 204     if (!(win->_flags & _SUBWIN)) {
 205         if (ToCols == size_x) {
 206             for (row = ToLines + 1; row <= size_y; row++) {
 207                 free(win->_line[row].text);
 208             }
 209         } else {
 210             for (row = 0; row <= size_y; row++) {
 211                 free(win->_line[row].text);
 212             }
 213         }
 214     }
 215
 216     free(win->_line);
 217     win->_line = new_lines;
 218
 219     /*
 220      * Finally, adjust the parameters showing screen size and cursor
 221      * position:
 222      */
 223     win->_maxx = (NCURSES_SIZE_T) ToCols;
 224     win->_maxy = (NCURSES_SIZE_T) ToLines;
 225
 226     if (win->_regtop > win->_maxy)
 227         win->_regtop = win->_maxy;
 228     if (win->_regbottom > win->_maxy
 229         || win->_regbottom == size_y)
 230         win->_regbottom = win->_maxy;
 231
 232     if (win->_curx > win->_maxx)
 233         win->_curx = win->_maxx;
 234     if (win->_cury > win->_maxy)
 235         win->_cury = win->_maxy;
 236
 237     /*
 238      * Check for subwindows of this one, and readjust pointers to our text,
 239      * if needed.
 240      */
 241     repair_subwindows(win);
 242
 243 #ifdef TRACE
 244     TR(TRACE_UPDATE, ("...beg (%ld, %ld), max(%ld,%ld), reg(%ld,%ld)",
 245                       (long) win->_begy, (long) win->_begx,
 246                       (long) win->_maxy, (long) win->_maxx,
 247                       (long) win->_regtop, (long) win->_regbottom));
 248     if (USE_TRACEF(TRACE_UPDATE)) {
 249         _tracedump("...after:", win);
 250         _nc_unlock_global(tracef);
 251     }
 252 #endif
 253     returnCode(OK);
 254 }