1 /* $OpenBSD: screen.c,v 1.27 2014/01/09 14:05:55 nicm Exp $ */ 2 3 /* 4 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER 15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/types.h> 20 21 #include <stdlib.h> 22 #include <string.h> 23 #include <unistd.h> 24 25 #include "tmux.h" 26 27 void screen_resize_x(struct screen *, u_int); 28 void screen_resize_y(struct screen *, u_int); 29 30 /* Create a new screen. */ 31 void 32 screen_init(struct screen *s, u_int sx, u_int sy, u_int hlimit) 33 { 34 char hn[MAXHOSTNAMELEN]; 35 36 s->grid = grid_create(sx, sy, hlimit); 37 38 if (gethostname(hn, MAXHOSTNAMELEN) == 0) 39 s->title = xstrdup(hn); 40 else 41 s->title = xstrdup(""); 42 43 s->cstyle = 0; 44 s->ccolour = xstrdup(""); 45 s->tabs = NULL; 46 47 screen_reinit(s); 48 } 49 50 /* Reinitialise screen. */ 51 void 52 screen_reinit(struct screen *s) 53 { 54 s->cx = 0; 55 s->cy = 0; 56 57 s->rupper = 0; 58 s->rlower = screen_size_y(s) - 1; 59 60 s->mode = MODE_CURSOR | MODE_WRAP; 61 62 screen_reset_tabs(s); 63 64 grid_clear_lines(s->grid, s->grid->hsize, s->grid->sy); 65 66 screen_clear_selection(s); 67 } 68 69 /* Destroy a screen. */ 70 void 71 screen_free(struct screen *s) 72 { 73 free(s->tabs); 74 free(s->title); 75 free(s->ccolour); 76 grid_destroy(s->grid); 77 } 78 79 /* Reset tabs to default, eight spaces apart. */ 80 void 81 screen_reset_tabs(struct screen *s) 82 { 83 u_int i; 84 85 free(s->tabs); 86 87 if ((s->tabs = bit_alloc(screen_size_x(s))) == NULL) 88 fatal("bit_alloc failed"); 89 for (i = 8; i < screen_size_x(s); i += 8) 90 bit_set(s->tabs, i); 91 } 92 93 /* Set screen cursor style. */ 94 void 95 screen_set_cursor_style(struct screen *s, u_int style) 96 { 97 if (style <= 6) 98 s->cstyle = style; 99 } 100 101 /* Set screen cursor colour. */ 102 void 103 screen_set_cursor_colour(struct screen *s, const char *colour_string) 104 { 105 free(s->ccolour); 106 s->ccolour = xstrdup(colour_string); 107 } 108 109 /* Set screen title. */ 110 void 111 screen_set_title(struct screen *s, const char *title) 112 { 113 free(s->title); 114 s->title = xstrdup(title); 115 } 116 117 /* Resize screen. */ 118 void 119 screen_resize(struct screen *s, u_int sx, u_int sy, int reflow) 120 { 121 if (sx < 1) 122 sx = 1; 123 if (sy < 1) 124 sy = 1; 125 126 if (sx != screen_size_x(s)) { 127 screen_resize_x(s, sx); 128 129 /* 130 * It is unclear what should happen to tabs on resize. xterm 131 * seems to try and maintain them, rxvt resets them. Resetting 132 * is simpler and more reliable so let's do that. 133 */ 134 screen_reset_tabs(s); 135 } 136 137 if (sy != screen_size_y(s)) 138 screen_resize_y(s, sy); 139 140 if (reflow) 141 screen_reflow(s, sx); 142 } 143 144 void 145 screen_resize_x(struct screen *s, u_int sx) 146 { 147 struct grid *gd = s->grid; 148 149 if (sx == 0) 150 fatalx("zero size"); 151 152 /* 153 * Treat resizing horizontally simply: just ensure the cursor is 154 * on-screen and change the size. Don't bother to truncate any lines - 155 * then the data should be accessible if the size is then incrased. 156 * 157 * The only potential wrinkle is if UTF-8 double-width characters are 158 * left in the last column, but UTF-8 terminals should deal with this 159 * sanely. 160 */ 161 if (s->cx >= sx) 162 s->cx = sx - 1; 163 gd->sx = sx; 164 } 165 166 void 167 screen_resize_y(struct screen *s, u_int sy) 168 { 169 struct grid *gd = s->grid; 170 u_int needed, available, oldy, i; 171 172 if (sy == 0) 173 fatalx("zero size"); 174 oldy = screen_size_y(s); 175 176 /* 177 * When resizing: 178 * 179 * If the height is decreasing, delete lines from the bottom until 180 * hitting the cursor, then push lines from the top into the history. 181 * 182 * When increasing, pull as many lines as possible from the history to 183 * the top, then fill the remaining with blanks at the bottom. 184 */ 185 186 /* Size decreasing. */ 187 if (sy < oldy) { 188 needed = oldy - sy; 189 190 /* Delete as many lines as possible from the bottom. */ 191 available = oldy - 1 - s->cy; 192 if (available > 0) { 193 if (available > needed) 194 available = needed; 195 grid_view_delete_lines(gd, oldy - available, available); 196 } 197 needed -= available; 198 199 /* 200 * Now just increase the history size, if possible, to take 201 * over the lines which are left. If history is off, delete 202 * lines from the top. 203 * 204 * XXX Should apply history limit? 205 */ 206 available = s->cy; 207 if (gd->flags & GRID_HISTORY) 208 gd->hsize += needed; 209 else if (needed > 0 && available > 0) { 210 if (available > needed) 211 available = needed; 212 grid_view_delete_lines(gd, 0, available); 213 } 214 s->cy -= needed; 215 } 216 217 /* Resize line arrays. */ 218 gd->linedata = xrealloc( 219 gd->linedata, gd->hsize + sy, sizeof *gd->linedata); 220 221 /* Size increasing. */ 222 if (sy > oldy) { 223 needed = sy - oldy; 224 225 /* 226 * Try to pull as much as possible out of the history, if is 227 * is enabled. 228 */ 229 available = gd->hsize; 230 if (gd->flags & GRID_HISTORY && available > 0) { 231 if (available > needed) 232 available = needed; 233 gd->hsize -= available; 234 s->cy += available; 235 } else 236 available = 0; 237 needed -= available; 238 239 /* Then fill the rest in with blanks. */ 240 for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++) 241 memset(&gd->linedata[i], 0, sizeof gd->linedata[i]); 242 } 243 244 /* Set the new size, and reset the scroll region. */ 245 gd->sy = sy; 246 s->rupper = 0; 247 s->rlower = screen_size_y(s) - 1; 248 } 249 250 /* Set selection. */ 251 void 252 screen_set_selection(struct screen *s, u_int sx, u_int sy, 253 u_int ex, u_int ey, u_int rectflag, struct grid_cell *gc) 254 { 255 struct screen_sel *sel = &s->sel; 256 257 memcpy(&sel->cell, gc, sizeof sel->cell); 258 sel->flag = 1; 259 sel->rectflag = rectflag; 260 261 sel->sx = sx; sel->sy = sy; 262 sel->ex = ex; sel->ey = ey; 263 } 264 265 /* Clear selection. */ 266 void 267 screen_clear_selection(struct screen *s) 268 { 269 struct screen_sel *sel = &s->sel; 270 271 sel->flag = 0; 272 } 273 274 /* Check if cell in selection. */ 275 int 276 screen_check_selection(struct screen *s, u_int px, u_int py) 277 { 278 struct screen_sel *sel = &s->sel; 279 280 if (!sel->flag) 281 return (0); 282 283 if (sel->rectflag) { 284 if (sel->sy < sel->ey) { 285 /* start line < end line -- downward selection. */ 286 if (py < sel->sy || py > sel->ey) 287 return (0); 288 } else if (sel->sy > sel->ey) { 289 /* start line > end line -- upward selection. */ 290 if (py > sel->sy || py < sel->ey) 291 return (0); 292 } else { 293 /* starting line == ending line. */ 294 if (py != sel->sy) 295 return (0); 296 } 297 298 /* 299 * Need to include the selection start row, but not the cursor 300 * row, which means the selection changes depending on which 301 * one is on the left. 302 */ 303 if (sel->ex < sel->sx) { 304 /* Cursor (ex) is on the left. */ 305 if (px < sel->ex) 306 return (0); 307 308 if (px > sel->sx) 309 return (0); 310 } else { 311 /* Selection start (sx) is on the left. */ 312 if (px < sel->sx) 313 return (0); 314 315 if (px > sel->ex) 316 return (0); 317 } 318 } else { 319 /* 320 * Like emacs, keep the top-left-most character, and drop the 321 * bottom-right-most, regardless of copy direction. 322 */ 323 if (sel->sy < sel->ey) { 324 /* starting line < ending line -- downward selection. */ 325 if (py < sel->sy || py > sel->ey) 326 return (0); 327 328 if ((py == sel->sy && px < sel->sx) 329 || (py == sel->ey && px > sel->ex)) 330 return (0); 331 } else if (sel->sy > sel->ey) { 332 /* starting line > ending line -- upward selection. */ 333 if (py > sel->sy || py < sel->ey) 334 return (0); 335 336 if ((py == sel->sy && px >= sel->sx) 337 || (py == sel->ey && px < sel->ex)) 338 return (0); 339 } else { 340 /* starting line == ending line. */ 341 if (py != sel->sy) 342 return (0); 343 344 if (sel->ex < sel->sx) { 345 /* cursor (ex) is on the left */ 346 if (px > sel->sx || px < sel->ex) 347 return (0); 348 } else { 349 /* selection start (sx) is on the left */ 350 if (px < sel->sx || px > sel->ex) 351 return (0); 352 } 353 } 354 } 355 356 return (1); 357 } 358 359 /* Reflow wrapped lines. */ 360 void 361 screen_reflow(struct screen *s, u_int new_x) 362 { 363 struct grid *old = s->grid; 364 u_int change; 365 366 s->grid = grid_create(old->sx, old->sy, old->hlimit); 367 368 change = grid_reflow(s->grid, old, new_x); 369 if (change < s->cy) 370 s->cy -= change; 371 else 372 s->cy = 0; 373 } 374