1 /**************************************************************************** 2 * Copyright (c) 1998-2009,2010 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 1996-on * 31 * and: Juergen Pfeifer * 32 ****************************************************************************/ 33 34 #include <curses.priv.h> 35 36 MODULE_ID("$Id: wresize.c,v 1.34 2010/06/05 22:36:26 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 { 179 assert(pline != 0); 180 s = &pline[win->_pary + row].text[win->_parx]; 181 } 182 183 if_USE_SCROLL_HINTS(new_lines[row].oldindex = row); 184 if (row <= size_y) { 185 new_lines[row].firstchar = win->_line[row].firstchar; 186 new_lines[row].lastchar = win->_line[row].lastchar; 187 } 188 if ((ToCols != size_x) || (row > size_y)) { 189 if (end >= begin) { /* growing */ 190 if (new_lines[row].firstchar < begin) 191 new_lines[row].firstchar = (NCURSES_SIZE_T) begin; 192 } else { /* shrinking */ 193 new_lines[row].firstchar = 0; 194 } 195 new_lines[row].lastchar = (NCURSES_SIZE_T) ToCols; 196 } 197 new_lines[row].text = s; 198 } 199 200 /* 201 * Dispose of unwanted memory. 202 */ 203 if (!(win->_flags & _SUBWIN)) { 204 if (ToCols == size_x) { 205 for (row = ToLines + 1; row <= size_y; row++) { 206 free(win->_line[row].text); 207 } 208 } else { 209 for (row = 0; row <= size_y; row++) { 210 free(win->_line[row].text); 211 } 212 } 213 } 214 215 free(win->_line); 216 win->_line = new_lines; 217 218 /* 219 * Finally, adjust the parameters showing screen size and cursor 220 * position: 221 */ 222 win->_maxx = (NCURSES_SIZE_T) ToCols; 223 win->_maxy = (NCURSES_SIZE_T) ToLines; 224 225 if (win->_regtop > win->_maxy) 226 win->_regtop = win->_maxy; 227 if (win->_regbottom > win->_maxy 228 || win->_regbottom == size_y) 229 win->_regbottom = win->_maxy; 230 231 if (win->_curx > win->_maxx) 232 win->_curx = win->_maxx; 233 if (win->_cury > win->_maxy) 234 win->_cury = win->_maxy; 235 236 /* 237 * Check for subwindows of this one, and readjust pointers to our text, 238 * if needed. 239 */ 240 repair_subwindows(win); 241 242 #ifdef TRACE 243 TR(TRACE_UPDATE, ("...beg (%ld, %ld), max(%ld,%ld), reg(%ld,%ld)", 244 (long) win->_begy, (long) win->_begx, 245 (long) win->_maxy, (long) win->_maxx, 246 (long) win->_regtop, (long) win->_regbottom)); 247 if (USE_TRACEF(TRACE_UPDATE)) { 248 _tracedump("...after:", win); 249 _nc_unlock_global(tracef); 250 } 251 #endif 252 returnCode(OK); 253 } 254