1 /**************************************************************************** 2 * Copyright (c) 1998,1999,2000 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: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 31 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 32 ****************************************************************************/ 33 34 /* 35 ** lib_newwin.c 36 ** 37 ** The routines newwin(), subwin() and their dependent 38 ** 39 */ 40 41 #include <curses.priv.h> 42 43 MODULE_ID("$Id: lib_newwin.c,v 1.24 2000/04/29 18:49:51 tom Exp $") 44 45 void 46 _nc_freewin(WINDOW *win) 47 { 48 WINDOWLIST *p, *q; 49 int i; 50 51 if (win != 0) { 52 for (p = _nc_windows, q = 0; p != 0; q = p, p = p->next) { 53 if (p->win == win) { 54 if (q == 0) 55 _nc_windows = p->next; 56 else 57 q->next = p->next; 58 free(p); 59 60 if (!(win->_flags & _SUBWIN)) { 61 for (i = 0; i <= win->_maxy; i++) 62 FreeIfNeeded(win->_line[i].text); 63 } 64 free(win->_line); 65 free(win); 66 67 if (win == curscr) 68 curscr = 0; 69 if (win == stdscr) 70 stdscr = 0; 71 if (win == newscr) 72 newscr = 0; 73 74 T(("...deleted win=%p", win)); 75 break; 76 } 77 } 78 } 79 } 80 81 WINDOW * 82 newwin(int num_lines, int num_columns, int begy, int begx) 83 { 84 WINDOW *win; 85 chtype *ptr; 86 int i; 87 88 T((T_CALLED("newwin(%d,%d,%d,%d)"), num_lines, num_columns, begy, begx)); 89 90 if (begy < 0 || begx < 0 || num_lines < 0 || num_columns < 0) 91 returnWin(0); 92 93 if (num_lines == 0) 94 num_lines = SP->_lines_avail - begy; 95 if (num_columns == 0) 96 num_columns = screen_columns - begx; 97 98 if (num_columns + begx > SP->_columns || num_lines + begy > SP->_lines_avail) 99 returnWin(0); 100 101 if ((win = _nc_makenew(num_lines, num_columns, begy, begx, 0)) == 0) 102 returnWin(0); 103 104 for (i = 0; i < num_lines; i++) { 105 win->_line[i].text = typeCalloc(chtype, (unsigned) num_columns); 106 if (win->_line[i].text == 0) { 107 _nc_freewin(win); 108 returnWin(0); 109 } 110 for (ptr = win->_line[i].text; ptr < win->_line[i].text + 111 num_columns;) 112 *ptr++ = ' '; 113 } 114 115 T(("newwin: returned window is %p", win)); 116 117 returnWin(win); 118 } 119 120 WINDOW * 121 derwin(WINDOW *orig, int num_lines, int num_columns, int begy, int begx) 122 { 123 WINDOW *win; 124 int i; 125 int flags = _SUBWIN; 126 127 T((T_CALLED("derwin(%p,%d,%d,%d,%d)"), orig, num_lines, num_columns, 128 begy, begx)); 129 130 /* 131 ** make sure window fits inside the original one 132 */ 133 if (begy < 0 || begx < 0 || orig == 0 || num_lines < 0 || num_columns < 0) 134 returnWin(0); 135 if (begy + num_lines > orig->_maxy + 1 136 || begx + num_columns > orig->_maxx + 1) 137 returnWin(0); 138 139 if (num_lines == 0) 140 num_lines = orig->_maxy + 1 - begy; 141 142 if (num_columns == 0) 143 num_columns = orig->_maxx + 1 - begx; 144 145 if (orig->_flags & _ISPAD) 146 flags |= _ISPAD; 147 148 if ((win = _nc_makenew(num_lines, num_columns, orig->_begy + begy, 149 orig->_begx + begx, flags)) == 0) 150 returnWin(0); 151 152 win->_pary = begy; 153 win->_parx = begx; 154 win->_attrs = orig->_attrs; 155 win->_bkgd = orig->_bkgd; 156 157 for (i = 0; i < num_lines; i++) 158 win->_line[i].text = &orig->_line[begy++].text[begx]; 159 160 win->_parent = orig; 161 162 T(("derwin: returned window is %p", win)); 163 164 returnWin(win); 165 } 166 167 WINDOW * 168 subwin(WINDOW *w, int l, int c, int y, int x) 169 { 170 T((T_CALLED("subwin(%p, %d, %d, %d, %d)"), w, l, c, y, x)); 171 T(("parent has begy = %d, begx = %d", w->_begy, w->_begx)); 172 173 returnWin(derwin(w, l, c, y - w->_begy, x - w->_begx)); 174 } 175 176 static bool 177 dimension_limit(int value) 178 { 179 NCURSES_SIZE_T test = value; 180 return (test == value && value > 0); 181 } 182 183 WINDOW * 184 _nc_makenew(int num_lines, int num_columns, int begy, int begx, int flags) 185 { 186 int i; 187 WINDOWLIST *wp; 188 WINDOW *win; 189 bool is_pad = (flags & _ISPAD); 190 191 T(("_nc_makenew(%d,%d,%d,%d)", num_lines, num_columns, begy, begx)); 192 193 if (!dimension_limit(num_lines) || !dimension_limit(num_columns)) 194 return 0; 195 196 if ((wp = typeCalloc(WINDOWLIST, 1)) == 0) 197 return 0; 198 199 if ((win = typeCalloc(WINDOW, 1)) == 0) 200 return 0; 201 202 if ((win->_line = typeCalloc(struct ldat, ((unsigned) num_lines))) == 0) { 203 free(win); 204 return 0; 205 } 206 207 win->_curx = 0; 208 win->_cury = 0; 209 win->_maxy = num_lines - 1; 210 win->_maxx = num_columns - 1; 211 win->_begy = begy; 212 win->_begx = begx; 213 win->_yoffset = SP->_topstolen; 214 215 win->_flags = flags; 216 win->_attrs = A_NORMAL; 217 win->_bkgd = BLANK; 218 219 win->_clear = is_pad ? FALSE : (num_lines == screen_lines && num_columns 220 == screen_columns); 221 win->_idlok = FALSE; 222 win->_idcok = TRUE; 223 win->_scroll = FALSE; 224 win->_leaveok = FALSE; 225 win->_use_keypad = FALSE; 226 win->_delay = -1; 227 win->_immed = FALSE; 228 win->_sync = 0; 229 win->_parx = -1; 230 win->_pary = -1; 231 win->_parent = 0; 232 233 win->_regtop = 0; 234 win->_regbottom = num_lines - 1; 235 236 win->_pad._pad_y = -1; 237 win->_pad._pad_x = -1; 238 win->_pad._pad_top = -1; 239 win->_pad._pad_bottom = -1; 240 win->_pad._pad_left = -1; 241 win->_pad._pad_right = -1; 242 243 for (i = 0; i < num_lines; i++) { 244 /* 245 * This used to do 246 * 247 * win->_line[i].firstchar = win->_line[i].lastchar = _NOCHANGE; 248 * 249 * which marks the whole window unchanged. That's how 250 * SVr1 curses did it, but SVr4 curses marks the whole new 251 * window changed. 252 * 253 * With the old SVr1-like code, say you have stdscr full of 254 * characters, then create a new window with newwin(), 255 * then do a printw(win, "foo ");, the trailing spaces are 256 * completely ignored by the following refreshes. So, you 257 * get "foojunkjunk" on the screen instead of "foo " as 258 * you actually intended. 259 * 260 * SVr4 doesn't do this. Instead the spaces are actually written. 261 * So that's how we want ncurses to behave. 262 */ 263 win->_line[i].firstchar = 0; 264 win->_line[i].lastchar = num_columns - 1; 265 266 if_USE_SCROLL_HINTS(win->_line[i].oldindex = i); 267 } 268 269 if (!is_pad && (begx + num_columns == screen_columns)) { 270 win->_flags |= _ENDLINE; 271 272 if (begx == 0 && num_lines == screen_lines && begy == 0) 273 win->_flags |= _FULLWIN; 274 275 if (begy + num_lines == screen_lines) 276 win->_flags |= _SCROLLWIN; 277 } 278 279 wp->next = _nc_windows; 280 wp->win = win; 281 _nc_windows = wp; 282 283 T((T_CREATE("window %p"), win)); 284 285 return (win); 286 } 287