1 /* $OpenBSD: wresize.c,v 1.5 2010/01/12 23:22:06 nicm Exp $ */ 2 3 /**************************************************************************** 4 * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc. * 5 * * 6 * Permission is hereby granted, free of charge, to any person obtaining a * 7 * copy of this software and associated documentation files (the * 8 * "Software"), to deal in the Software without restriction, including * 9 * without limitation the rights to use, copy, modify, merge, publish, * 10 * distribute, distribute with modifications, sublicense, and/or sell * 11 * copies of the Software, and to permit persons to whom the Software is * 12 * furnished to do so, subject to the following conditions: * 13 * * 14 * The above copyright notice and this permission notice shall be included * 15 * in all copies or substantial portions of the Software. * 16 * * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 20 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 21 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 22 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 23 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 24 * * 25 * Except as contained in this notice, the name(s) of the above copyright * 26 * holders shall not be used in advertising or otherwise to promote the * 27 * sale, use or other dealings in this Software without prior written * 28 * authorization. * 29 ****************************************************************************/ 30 31 /**************************************************************************** 32 * Author: Thomas E. Dickey 1996-2002 * 33 ****************************************************************************/ 34 35 #include <curses.priv.h> 36 37 MODULE_ID("$Id: wresize.c,v 1.5 2010/01/12 23:22:06 nicm Exp $") 38 39 static int 40 cleanup_lines(struct ldat *data, int length) 41 { 42 while (--length >= 0) 43 free(data[length].text); 44 free(data); 45 return ERR; 46 } 47 48 /* 49 * If we have reallocated the ldat structs, we will have to repair pointers 50 * used in subwindows. 51 */ 52 static void 53 repair_subwindows(WINDOW *cmp) 54 { 55 WINDOWLIST *wp; 56 struct ldat *pline = cmp->_line; 57 int row; 58 59 _nc_lock_global(curses); 60 61 for (each_window(wp)) { 62 WINDOW *tst = &(wp->win); 63 64 if (tst->_parent == cmp) { 65 66 if (tst->_pary > cmp->_maxy) 67 tst->_pary = cmp->_maxy; 68 if (tst->_parx > cmp->_maxx) 69 tst->_parx = cmp->_maxx; 70 71 if (tst->_maxy + tst->_pary > cmp->_maxy) 72 tst->_maxy = cmp->_maxy - tst->_pary; 73 if (tst->_maxx + tst->_parx > cmp->_maxx) 74 tst->_maxx = cmp->_maxx - tst->_parx; 75 76 for (row = 0; row <= tst->_maxy; ++row) { 77 tst->_line[row].text = &pline[tst->_pary + row].text[tst->_parx]; 78 } 79 repair_subwindows(tst); 80 } 81 } 82 _nc_unlock_global(curses); 83 } 84 85 /* 86 * Reallocate a curses WINDOW struct to either shrink or grow to the specified 87 * new lines/columns. If it grows, the new character cells are filled with 88 * blanks. The application is responsible for repainting the blank area. 89 */ 90 NCURSES_EXPORT(int) 91 wresize(WINDOW *win, int ToLines, int ToCols) 92 { 93 int col, row, size_x, size_y; 94 struct ldat *pline; 95 struct ldat *new_lines = 0; 96 97 #ifdef TRACE 98 T((T_CALLED("wresize(%p,%d,%d)"), win, ToLines, ToCols)); 99 if (win) { 100 TR(TRACE_UPDATE, ("...beg (%ld, %ld), max(%ld,%ld), reg(%ld,%ld)", 101 (long) win->_begy, (long) win->_begx, 102 (long) win->_maxy, (long) win->_maxx, 103 (long) win->_regtop, (long) win->_regbottom)); 104 if (USE_TRACEF(TRACE_UPDATE)) { 105 _tracedump("...before", win); 106 _nc_unlock_global(tracef); 107 } 108 } 109 #endif 110 111 if (!win || --ToLines < 0 || --ToCols < 0) 112 returnCode(ERR); 113 114 size_x = win->_maxx; 115 size_y = win->_maxy; 116 117 if (ToLines == size_y 118 && ToCols == size_x) 119 returnCode(OK); 120 121 if ((win->_flags & _SUBWIN)) { 122 /* 123 * Check if the new limits will fit into the parent window's size. If 124 * not, do not resize. We could adjust the location of the subwindow, 125 * but the application may not like that. 126 */ 127 if (win->_pary + ToLines > win->_parent->_maxy 128 || win->_parx + ToCols > win->_parent->_maxx) { 129 returnCode(ERR); 130 } 131 pline = win->_parent->_line; 132 } else { 133 pline = 0; 134 } 135 136 /* 137 * Allocate new memory as needed. Do the allocations without modifying 138 * the original window, in case an allocation fails. Always allocate 139 * (at least temporarily) the array pointing to the individual lines. 140 */ 141 new_lines = typeCalloc(struct ldat, (unsigned) (ToLines + 1)); 142 if (new_lines == 0) 143 returnCode(ERR); 144 145 /* 146 * For each line in the target, allocate or adjust pointers for the 147 * corresponding text, depending on whether this is a window or a 148 * subwindow. 149 */ 150 for (row = 0; row <= ToLines; ++row) { 151 int begin = (row > size_y) ? 0 : (size_x + 1); 152 int end = ToCols; 153 NCURSES_CH_T *s; 154 155 if (!(win->_flags & _SUBWIN)) { 156 if (row <= size_y) { 157 if (ToCols != size_x) { 158 if ((s = typeMalloc(NCURSES_CH_T, ToCols + 1)) == 0) 159 returnCode(cleanup_lines(new_lines, row)); 160 for (col = 0; col <= ToCols; ++col) { 161 s[col] = (col <= size_x 162 ? win->_line[row].text[col] 163 : win->_nc_bkgd); 164 } 165 } else { 166 s = win->_line[row].text; 167 } 168 } else { 169 if ((s = typeMalloc(NCURSES_CH_T, ToCols + 1)) == 0) 170 returnCode(cleanup_lines(new_lines, row)); 171 for (col = 0; col <= ToCols; ++col) 172 s[col] = win->_nc_bkgd; 173 } 174 } else { 175 s = &pline[win->_pary + row].text[win->_parx]; 176 } 177 178 if_USE_SCROLL_HINTS(new_lines[row].oldindex = row); 179 if (row <= size_y) { 180 new_lines[row].firstchar = win->_line[row].firstchar; 181 new_lines[row].lastchar = win->_line[row].lastchar; 182 } 183 if ((ToCols != size_x) || (row > size_y)) { 184 if (end >= begin) { /* growing */ 185 if (new_lines[row].firstchar < begin) 186 new_lines[row].firstchar = begin; 187 } else { /* shrinking */ 188 new_lines[row].firstchar = 0; 189 } 190 new_lines[row].lastchar = ToCols; 191 } 192 new_lines[row].text = s; 193 } 194 195 /* 196 * Dispose of unwanted memory. 197 */ 198 if (!(win->_flags & _SUBWIN)) { 199 if (ToCols == size_x) { 200 for (row = ToLines + 1; row <= size_y; row++) { 201 free(win->_line[row].text); 202 } 203 } else { 204 for (row = 0; row <= size_y; row++) { 205 free(win->_line[row].text); 206 } 207 } 208 } 209 210 free(win->_line); 211 win->_line = new_lines; 212 213 /* 214 * Finally, adjust the parameters showing screen size and cursor 215 * position: 216 */ 217 win->_maxx = ToCols; 218 win->_maxy = ToLines; 219 220 if (win->_regtop > win->_maxy) 221 win->_regtop = win->_maxy; 222 if (win->_regbottom > win->_maxy 223 || win->_regbottom == size_y) 224 win->_regbottom = win->_maxy; 225 226 if (win->_curx > win->_maxx) 227 win->_curx = win->_maxx; 228 if (win->_cury > win->_maxy) 229 win->_cury = win->_maxy; 230 231 /* 232 * Check for subwindows of this one, and readjust pointers to our text, 233 * if needed. 234 */ 235 repair_subwindows(win); 236 237 #ifdef TRACE 238 TR(TRACE_UPDATE, ("...beg (%ld, %ld), max(%ld,%ld), reg(%ld,%ld)", 239 (long) win->_begy, (long) win->_begx, 240 (long) win->_maxy, (long) win->_maxx, 241 (long) win->_regtop, (long) win->_regbottom)); 242 if (USE_TRACEF(TRACE_UPDATE)) { 243 _tracedump("...after:", win); 244 _nc_unlock_global(tracef); 245 } 246 #endif 247 returnCode(OK); 248 } 249