[14301] | 1 | /*- |
---|
| 2 | * Copyright (c) 1993, 1994 |
---|
| 3 | * The Regents of the University of California. All rights reserved. |
---|
| 4 | * Copyright (c) 1992, 1993, 1994, 1995, 1996 |
---|
| 5 | * Keith Bostic. All rights reserved. |
---|
| 6 | * |
---|
| 7 | * See the LICENSE file for redistribution information. |
---|
| 8 | */ |
---|
| 9 | |
---|
| 10 | #include "config.h" |
---|
| 11 | |
---|
| 12 | #ifndef lint |
---|
| 13 | static const char sccsid[] = "@(#)vs_line.c 10.19 (Berkeley) 9/26/96"; |
---|
| 14 | #endif /* not lint */ |
---|
| 15 | |
---|
| 16 | #include <sys/types.h> |
---|
| 17 | #include <sys/queue.h> |
---|
| 18 | #include <sys/time.h> |
---|
| 19 | |
---|
| 20 | #include <bitstring.h> |
---|
| 21 | #include <limits.h> |
---|
| 22 | #include <stdio.h> |
---|
| 23 | #include <string.h> |
---|
| 24 | |
---|
| 25 | #include "../common/common.h" |
---|
| 26 | #include "vi.h" |
---|
| 27 | |
---|
| 28 | #ifdef VISIBLE_TAB_CHARS |
---|
| 29 | #define TABCH '-' |
---|
| 30 | #else |
---|
| 31 | #define TABCH ' ' |
---|
| 32 | #endif |
---|
| 33 | |
---|
| 34 | /* |
---|
| 35 | * vs_line -- |
---|
| 36 | * Update one line on the screen. |
---|
| 37 | * |
---|
| 38 | * PUBLIC: int vs_line __P((SCR *, SMAP *, size_t *, size_t *)); |
---|
| 39 | */ |
---|
| 40 | int |
---|
| 41 | vs_line(sp, smp, yp, xp) |
---|
| 42 | SCR *sp; |
---|
| 43 | SMAP *smp; |
---|
| 44 | size_t *xp, *yp; |
---|
| 45 | { |
---|
| 46 | CHAR_T *kp; |
---|
| 47 | GS *gp; |
---|
| 48 | SMAP *tsmp; |
---|
| 49 | size_t chlen, cno_cnt, cols_per_screen, len, nlen; |
---|
| 50 | size_t offset_in_char, offset_in_line, oldx, oldy; |
---|
| 51 | size_t scno, skip_cols, skip_screens; |
---|
| 52 | int ch, dne, is_cached, is_partial, is_tab; |
---|
| 53 | int list_tab, list_dollar; |
---|
| 54 | char *p, *cbp, *ecbp, cbuf[128]; |
---|
| 55 | |
---|
| 56 | #if defined(DEBUG) && 0 |
---|
| 57 | TRACE(sp, "vs_line: row %u: line: %u off: %u\n", |
---|
| 58 | smp - HMAP, smp->lno, smp->off); |
---|
| 59 | #endif |
---|
| 60 | /* |
---|
| 61 | * If ex modifies the screen after ex output is already on the screen, |
---|
| 62 | * don't touch it -- we'll get scrolling wrong, at best. |
---|
| 63 | */ |
---|
| 64 | if (!F_ISSET(sp, SC_TINPUT_INFO) && VIP(sp)->totalcount > 1) |
---|
| 65 | return (0); |
---|
| 66 | if (F_ISSET(sp, SC_SCR_EXWROTE) && smp - HMAP != LASTLINE(sp)) |
---|
| 67 | return (0); |
---|
| 68 | |
---|
| 69 | /* |
---|
| 70 | * Assume that, if the cache entry for the line is filled in, the |
---|
| 71 | * line is already on the screen, and all we need to do is return |
---|
| 72 | * the cursor position. If the calling routine doesn't need the |
---|
| 73 | * cursor position, we can just return. |
---|
| 74 | */ |
---|
| 75 | is_cached = SMAP_CACHE(smp); |
---|
| 76 | if (yp == NULL && is_cached) |
---|
| 77 | return (0); |
---|
| 78 | |
---|
| 79 | /* |
---|
| 80 | * A nasty side effect of this routine is that it returns the screen |
---|
| 81 | * position for the "current" character. Not pretty, but this is the |
---|
| 82 | * only routine that really knows what's out there. |
---|
| 83 | * |
---|
| 84 | * Move to the line. This routine can be called by vs_sm_position(), |
---|
| 85 | * which uses it to fill in the cache entry so it can figure out what |
---|
| 86 | * the real contents of the screen are. Because of this, we have to |
---|
| 87 | * return to whereever we started from. |
---|
| 88 | */ |
---|
| 89 | gp = sp->gp; |
---|
| 90 | (void)gp->scr_cursor(sp, &oldy, &oldx); |
---|
| 91 | (void)gp->scr_move(sp, smp - HMAP, 0); |
---|
| 92 | |
---|
| 93 | /* Get the line. */ |
---|
| 94 | dne = db_get(sp, smp->lno, 0, &p, &len); |
---|
| 95 | |
---|
| 96 | /* |
---|
| 97 | * Special case if we're printing the info/mode line. Skip printing |
---|
| 98 | * the leading number, as well as other minor setup. The only time |
---|
| 99 | * this code paints the mode line is when the user is entering text |
---|
| 100 | * for a ":" command, so we can put the code here instead of dealing |
---|
| 101 | * with the empty line logic below. This is a kludge, but it's pretty |
---|
| 102 | * much confined to this module. |
---|
| 103 | * |
---|
| 104 | * Set the number of columns for this screen. |
---|
| 105 | * Set the number of chars or screens to skip until a character is to |
---|
| 106 | * be displayed. |
---|
| 107 | */ |
---|
| 108 | cols_per_screen = sp->cols; |
---|
| 109 | if (O_ISSET(sp, O_LEFTRIGHT)) { |
---|
| 110 | skip_screens = 0; |
---|
| 111 | skip_cols = smp->coff; |
---|
| 112 | } else { |
---|
| 113 | skip_screens = smp->soff - 1; |
---|
| 114 | skip_cols = skip_screens * cols_per_screen; |
---|
| 115 | } |
---|
| 116 | |
---|
| 117 | list_tab = O_ISSET(sp, O_LIST); |
---|
| 118 | if (F_ISSET(sp, SC_TINPUT_INFO)) |
---|
| 119 | list_dollar = 0; |
---|
| 120 | else { |
---|
| 121 | list_dollar = list_tab; |
---|
| 122 | |
---|
| 123 | /* |
---|
| 124 | * If O_NUMBER is set, the line doesn't exist and it's line |
---|
| 125 | * number 1, i.e., an empty file, display the line number. |
---|
| 126 | * |
---|
| 127 | * If O_NUMBER is set, the line exists and the first character |
---|
| 128 | * on the screen is the first character in the line, display |
---|
| 129 | * the line number. |
---|
| 130 | * |
---|
| 131 | * !!! |
---|
| 132 | * If O_NUMBER set, decrement the number of columns in the |
---|
| 133 | * first screen. DO NOT CHANGE THIS -- IT'S RIGHT! The |
---|
| 134 | * rest of the code expects this to reflect the number of |
---|
| 135 | * columns in the first screen, regardless of the number of |
---|
| 136 | * columns we're going to skip. |
---|
| 137 | */ |
---|
| 138 | if (O_ISSET(sp, O_NUMBER)) { |
---|
| 139 | cols_per_screen -= O_NUMBER_LENGTH; |
---|
| 140 | if ((!dne || smp->lno == 1) && skip_cols == 0) { |
---|
| 141 | nlen = snprintf(cbuf, |
---|
| 142 | sizeof(cbuf), O_NUMBER_FMT, smp->lno); |
---|
| 143 | (void)gp->scr_addstr(sp, cbuf, nlen); |
---|
| 144 | } |
---|
| 145 | } |
---|
| 146 | } |
---|
| 147 | |
---|
| 148 | /* |
---|
| 149 | * Special case non-existent lines and the first line of an empty |
---|
| 150 | * file. In both cases, the cursor position is 0, but corrected |
---|
| 151 | * as necessary for the O_NUMBER field, if it was displayed. |
---|
| 152 | */ |
---|
| 153 | if (dne || len == 0) { |
---|
| 154 | /* Fill in the cursor. */ |
---|
| 155 | if (yp != NULL && smp->lno == sp->lno) { |
---|
| 156 | *yp = smp - HMAP; |
---|
| 157 | *xp = sp->cols - cols_per_screen; |
---|
| 158 | } |
---|
| 159 | |
---|
| 160 | /* If the line is on the screen, quit. */ |
---|
| 161 | if (is_cached) |
---|
| 162 | goto ret1; |
---|
| 163 | |
---|
| 164 | /* Set line cache information. */ |
---|
| 165 | smp->c_sboff = smp->c_eboff = 0; |
---|
| 166 | smp->c_scoff = smp->c_eclen = 0; |
---|
| 167 | |
---|
| 168 | /* |
---|
| 169 | * Lots of special cases for empty lines, but they only apply |
---|
| 170 | * if we're displaying the first screen of the line. |
---|
| 171 | */ |
---|
| 172 | if (skip_cols == 0) |
---|
| 173 | if (dne) { |
---|
| 174 | if (smp->lno == 1) { |
---|
| 175 | if (list_dollar) { |
---|
| 176 | ch = '$'; |
---|
| 177 | goto empty; |
---|
| 178 | } |
---|
| 179 | } else { |
---|
| 180 | ch = '~'; |
---|
| 181 | goto empty; |
---|
| 182 | } |
---|
| 183 | } else |
---|
| 184 | if (list_dollar) { |
---|
| 185 | ch = '$'; |
---|
| 186 | empty: (void)gp->scr_addstr(sp, |
---|
| 187 | KEY_NAME(sp, ch), KEY_LEN(sp, ch)); |
---|
| 188 | } |
---|
| 189 | |
---|
| 190 | (void)gp->scr_clrtoeol(sp); |
---|
| 191 | (void)gp->scr_move(sp, oldy, oldx); |
---|
| 192 | return (0); |
---|
| 193 | } |
---|
| 194 | |
---|
| 195 | /* |
---|
| 196 | * If we just wrote this or a previous line, we cached the starting |
---|
| 197 | * and ending positions of that line. The way it works is we keep |
---|
| 198 | * information about the lines displayed in the SMAP. If we're |
---|
| 199 | * painting the screen in the forward direction, this saves us from |
---|
| 200 | * reformatting the physical line for every line on the screen. This |
---|
| 201 | * wins big on binary files with 10K lines. |
---|
| 202 | * |
---|
| 203 | * Test for the first screen of the line, then the current screen line, |
---|
| 204 | * then the line behind us, then do the hard work. Note, it doesn't |
---|
| 205 | * do us any good to have a line in front of us -- it would be really |
---|
| 206 | * hard to try and figure out tabs in the reverse direction, i.e. how |
---|
| 207 | * many spaces a tab takes up in the reverse direction depends on |
---|
| 208 | * what characters preceded it. |
---|
| 209 | * |
---|
| 210 | * Test for the first screen of the line. |
---|
| 211 | */ |
---|
| 212 | if (skip_cols == 0) { |
---|
| 213 | smp->c_sboff = offset_in_line = 0; |
---|
| 214 | smp->c_scoff = offset_in_char = 0; |
---|
| 215 | p = &p[offset_in_line]; |
---|
| 216 | goto display; |
---|
| 217 | } |
---|
| 218 | |
---|
| 219 | /* Test to see if we've seen this exact line before. */ |
---|
| 220 | if (is_cached) { |
---|
| 221 | offset_in_line = smp->c_sboff; |
---|
| 222 | offset_in_char = smp->c_scoff; |
---|
| 223 | p = &p[offset_in_line]; |
---|
| 224 | |
---|
| 225 | /* Set cols_per_screen to 2nd and later line length. */ |
---|
| 226 | if (O_ISSET(sp, O_LEFTRIGHT) || skip_cols > cols_per_screen) |
---|
| 227 | cols_per_screen = sp->cols; |
---|
| 228 | goto display; |
---|
| 229 | } |
---|
| 230 | |
---|
| 231 | /* Test to see if we saw an earlier part of this line before. */ |
---|
| 232 | if (smp != HMAP && |
---|
| 233 | SMAP_CACHE(tsmp = smp - 1) && tsmp->lno == smp->lno) { |
---|
| 234 | if (tsmp->c_eclen != tsmp->c_ecsize) { |
---|
| 235 | offset_in_line = tsmp->c_eboff; |
---|
| 236 | offset_in_char = tsmp->c_eclen; |
---|
| 237 | } else { |
---|
| 238 | offset_in_line = tsmp->c_eboff + 1; |
---|
| 239 | offset_in_char = 0; |
---|
| 240 | } |
---|
| 241 | |
---|
| 242 | /* Put starting info for this line in the cache. */ |
---|
| 243 | smp->c_sboff = offset_in_line; |
---|
| 244 | smp->c_scoff = offset_in_char; |
---|
| 245 | p = &p[offset_in_line]; |
---|
| 246 | |
---|
| 247 | /* Set cols_per_screen to 2nd and later line length. */ |
---|
| 248 | if (O_ISSET(sp, O_LEFTRIGHT) || skip_cols > cols_per_screen) |
---|
| 249 | cols_per_screen = sp->cols; |
---|
| 250 | goto display; |
---|
| 251 | } |
---|
| 252 | |
---|
| 253 | scno = 0; |
---|
| 254 | offset_in_line = 0; |
---|
| 255 | offset_in_char = 0; |
---|
| 256 | |
---|
| 257 | /* Do it the hard way, for leftright scrolling screens. */ |
---|
| 258 | if (O_ISSET(sp, O_LEFTRIGHT)) { |
---|
| 259 | for (; offset_in_line < len; ++offset_in_line) { |
---|
| 260 | chlen = (ch = *(u_char *)p++) == '\t' && !list_tab ? |
---|
| 261 | TAB_OFF(scno) : KEY_LEN(sp, ch); |
---|
| 262 | if ((scno += chlen) >= skip_cols) |
---|
| 263 | break; |
---|
| 264 | } |
---|
| 265 | |
---|
| 266 | /* Set cols_per_screen to 2nd and later line length. */ |
---|
| 267 | cols_per_screen = sp->cols; |
---|
| 268 | |
---|
| 269 | /* Put starting info for this line in the cache. */ |
---|
| 270 | if (scno != skip_cols) { |
---|
| 271 | smp->c_sboff = offset_in_line; |
---|
| 272 | smp->c_scoff = |
---|
| 273 | offset_in_char = chlen - (scno - skip_cols); |
---|
| 274 | --p; |
---|
| 275 | } else { |
---|
| 276 | smp->c_sboff = ++offset_in_line; |
---|
| 277 | smp->c_scoff = 0; |
---|
| 278 | } |
---|
| 279 | } |
---|
| 280 | |
---|
| 281 | /* Do it the hard way, for historic line-folding screens. */ |
---|
| 282 | else { |
---|
| 283 | for (; offset_in_line < len; ++offset_in_line) { |
---|
| 284 | chlen = (ch = *(u_char *)p++) == '\t' && !list_tab ? |
---|
| 285 | TAB_OFF(scno) : KEY_LEN(sp, ch); |
---|
| 286 | if ((scno += chlen) < cols_per_screen) |
---|
| 287 | continue; |
---|
| 288 | scno -= cols_per_screen; |
---|
| 289 | |
---|
| 290 | /* Set cols_per_screen to 2nd and later line length. */ |
---|
| 291 | cols_per_screen = sp->cols; |
---|
| 292 | |
---|
| 293 | /* |
---|
| 294 | * If crossed the last skipped screen boundary, start |
---|
| 295 | * displaying the characters. |
---|
| 296 | */ |
---|
| 297 | if (--skip_screens == 0) |
---|
| 298 | break; |
---|
| 299 | } |
---|
| 300 | |
---|
| 301 | /* Put starting info for this line in the cache. */ |
---|
| 302 | if (scno != 0) { |
---|
| 303 | smp->c_sboff = offset_in_line; |
---|
| 304 | smp->c_scoff = offset_in_char = chlen - scno; |
---|
| 305 | --p; |
---|
| 306 | } else { |
---|
| 307 | smp->c_sboff = ++offset_in_line; |
---|
| 308 | smp->c_scoff = 0; |
---|
| 309 | } |
---|
| 310 | } |
---|
| 311 | |
---|
| 312 | display: |
---|
| 313 | /* |
---|
| 314 | * Set the number of characters to skip before reaching the cursor |
---|
| 315 | * character. Offset by 1 and use 0 as a flag value. Vs_line is |
---|
| 316 | * called repeatedly with a valid pointer to a cursor position. |
---|
| 317 | * Don't fill anything in unless it's the right line and the right |
---|
| 318 | * character, and the right part of the character... |
---|
| 319 | */ |
---|
| 320 | if (yp == NULL || |
---|
| 321 | smp->lno != sp->lno || sp->cno < offset_in_line || |
---|
| 322 | offset_in_line + cols_per_screen < sp->cno) { |
---|
| 323 | cno_cnt = 0; |
---|
| 324 | /* If the line is on the screen, quit. */ |
---|
| 325 | if (is_cached) |
---|
| 326 | goto ret1; |
---|
| 327 | } else |
---|
| 328 | cno_cnt = (sp->cno - offset_in_line) + 1; |
---|
| 329 | |
---|
| 330 | /* This is the loop that actually displays characters. */ |
---|
| 331 | ecbp = (cbp = cbuf) + sizeof(cbuf) - 1; |
---|
| 332 | for (is_partial = 0, scno = 0; |
---|
| 333 | offset_in_line < len; ++offset_in_line, offset_in_char = 0) { |
---|
| 334 | if ((ch = *(u_char *)p++) == '\t' && !list_tab) { |
---|
| 335 | scno += chlen = TAB_OFF(scno) - offset_in_char; |
---|
| 336 | is_tab = 1; |
---|
| 337 | } else { |
---|
| 338 | scno += chlen = KEY_LEN(sp, ch) - offset_in_char; |
---|
| 339 | is_tab = 0; |
---|
| 340 | } |
---|
| 341 | |
---|
| 342 | /* |
---|
| 343 | * Only display up to the right-hand column. Set a flag if |
---|
| 344 | * the entire character wasn't displayed for use in setting |
---|
| 345 | * the cursor. If reached the end of the line, set the cache |
---|
| 346 | * info for the screen. Don't worry about there not being |
---|
| 347 | * characters to display on the next screen, its lno/off won't |
---|
| 348 | * match up in that case. |
---|
| 349 | */ |
---|
| 350 | if (scno >= cols_per_screen) { |
---|
| 351 | if (is_tab == 1) { |
---|
| 352 | chlen -= scno - cols_per_screen; |
---|
| 353 | smp->c_ecsize = smp->c_eclen = chlen; |
---|
| 354 | scno = cols_per_screen; |
---|
| 355 | } else { |
---|
| 356 | smp->c_ecsize = chlen; |
---|
| 357 | chlen -= scno - cols_per_screen; |
---|
| 358 | smp->c_eclen = chlen; |
---|
| 359 | |
---|
| 360 | if (scno > cols_per_screen) |
---|
| 361 | is_partial = 1; |
---|
| 362 | } |
---|
| 363 | smp->c_eboff = offset_in_line; |
---|
| 364 | |
---|
| 365 | /* Terminate the loop. */ |
---|
| 366 | offset_in_line = len; |
---|
| 367 | } |
---|
| 368 | |
---|
| 369 | /* |
---|
| 370 | * If the caller wants the cursor value, and this was the |
---|
| 371 | * cursor character, set the value. There are two ways to |
---|
| 372 | * put the cursor on a character -- if it's normal display |
---|
| 373 | * mode, it goes on the last column of the character. If |
---|
| 374 | * it's input mode, it goes on the first. In normal mode, |
---|
| 375 | * set the cursor only if the entire character was displayed. |
---|
| 376 | */ |
---|
| 377 | if (cno_cnt && |
---|
| 378 | --cno_cnt == 0 && (F_ISSET(sp, SC_TINPUT) || !is_partial)) { |
---|
| 379 | *yp = smp - HMAP; |
---|
| 380 | if (F_ISSET(sp, SC_TINPUT)) |
---|
| 381 | *xp = scno - chlen; |
---|
| 382 | else |
---|
| 383 | *xp = scno - 1; |
---|
| 384 | if (O_ISSET(sp, O_NUMBER) && |
---|
| 385 | !F_ISSET(sp, SC_TINPUT_INFO) && skip_cols == 0) |
---|
| 386 | *xp += O_NUMBER_LENGTH; |
---|
| 387 | |
---|
| 388 | /* If the line is on the screen, quit. */ |
---|
| 389 | if (is_cached) |
---|
| 390 | goto ret1; |
---|
| 391 | } |
---|
| 392 | |
---|
| 393 | /* If the line is on the screen, don't display anything. */ |
---|
| 394 | if (is_cached) |
---|
| 395 | continue; |
---|
| 396 | |
---|
| 397 | #define FLUSH { \ |
---|
| 398 | *cbp = '\0'; \ |
---|
| 399 | (void)gp->scr_addstr(sp, cbuf, cbp - cbuf); \ |
---|
| 400 | cbp = cbuf; \ |
---|
| 401 | } |
---|
| 402 | /* |
---|
| 403 | * Display the character. We do tab expansion here because |
---|
| 404 | * the screen interface doesn't have any way to set the tab |
---|
| 405 | * length. Note, it's theoretically possible for chlen to |
---|
| 406 | * be larger than cbuf, if the user set a impossibly large |
---|
| 407 | * tabstop. |
---|
| 408 | */ |
---|
| 409 | if (is_tab) |
---|
| 410 | while (chlen--) { |
---|
| 411 | if (cbp >= ecbp) |
---|
| 412 | FLUSH; |
---|
| 413 | *cbp++ = TABCH; |
---|
| 414 | } |
---|
| 415 | else { |
---|
| 416 | if (cbp + chlen >= ecbp) |
---|
| 417 | FLUSH; |
---|
| 418 | for (kp = KEY_NAME(sp, ch) + offset_in_char; chlen--;) |
---|
| 419 | *cbp++ = *kp++; |
---|
| 420 | } |
---|
| 421 | } |
---|
| 422 | |
---|
| 423 | if (scno < cols_per_screen) { |
---|
| 424 | /* If didn't paint the whole line, update the cache. */ |
---|
| 425 | smp->c_ecsize = smp->c_eclen = KEY_LEN(sp, ch); |
---|
| 426 | smp->c_eboff = len - 1; |
---|
| 427 | |
---|
| 428 | /* |
---|
| 429 | * If not the info/mode line, and O_LIST set, and at the |
---|
| 430 | * end of the line, and the line ended on this screen, |
---|
| 431 | * add a trailing $. |
---|
| 432 | */ |
---|
| 433 | if (list_dollar) { |
---|
| 434 | ++scno; |
---|
| 435 | |
---|
| 436 | chlen = KEY_LEN(sp, '$'); |
---|
| 437 | if (cbp + chlen >= ecbp) |
---|
| 438 | FLUSH; |
---|
| 439 | for (kp = KEY_NAME(sp, '$'); chlen--;) |
---|
| 440 | *cbp++ = *kp++; |
---|
| 441 | } |
---|
| 442 | |
---|
| 443 | /* If still didn't paint the whole line, clear the rest. */ |
---|
| 444 | if (scno < cols_per_screen) |
---|
| 445 | (void)gp->scr_clrtoeol(sp); |
---|
| 446 | } |
---|
| 447 | |
---|
| 448 | /* Flush any buffered characters. */ |
---|
| 449 | if (cbp > cbuf) |
---|
| 450 | FLUSH; |
---|
| 451 | |
---|
| 452 | ret1: (void)gp->scr_move(sp, oldy, oldx); |
---|
| 453 | return (0); |
---|
| 454 | } |
---|
| 455 | |
---|
| 456 | /* |
---|
| 457 | * vs_number -- |
---|
| 458 | * Repaint the numbers on all the lines. |
---|
| 459 | * |
---|
| 460 | * PUBLIC: int vs_number __P((SCR *)); |
---|
| 461 | */ |
---|
| 462 | int |
---|
| 463 | vs_number(sp) |
---|
| 464 | SCR *sp; |
---|
| 465 | { |
---|
| 466 | GS *gp; |
---|
| 467 | SMAP *smp; |
---|
| 468 | VI_PRIVATE *vip; |
---|
| 469 | size_t len, oldy, oldx; |
---|
| 470 | int exist; |
---|
| 471 | char nbuf[10]; |
---|
| 472 | |
---|
| 473 | gp = sp->gp; |
---|
| 474 | vip = VIP(sp); |
---|
| 475 | |
---|
| 476 | /* No reason to do anything if we're in input mode on the info line. */ |
---|
| 477 | if (F_ISSET(sp, SC_TINPUT_INFO)) |
---|
| 478 | return (0); |
---|
| 479 | |
---|
| 480 | /* |
---|
| 481 | * Try and avoid getting the last line in the file, by getting the |
---|
| 482 | * line after the last line in the screen -- if it exists, we know |
---|
| 483 | * we have to to number all the lines in the screen. Get the one |
---|
| 484 | * after the last instead of the last, so that the info line doesn't |
---|
| 485 | * fool us. (The problem is that file_lline will lie, and tell us |
---|
| 486 | * that the info line is the last line in the file.) If that test |
---|
| 487 | * fails, we have to check each line for existence. |
---|
| 488 | */ |
---|
| 489 | exist = db_exist(sp, TMAP->lno + 1); |
---|
| 490 | |
---|
| 491 | (void)gp->scr_cursor(sp, &oldy, &oldx); |
---|
| 492 | for (smp = HMAP; smp <= TMAP; ++smp) { |
---|
| 493 | /* Numbers are only displayed for the first screen line. */ |
---|
| 494 | if (O_ISSET(sp, O_LEFTRIGHT)) { |
---|
| 495 | if (smp->coff != 0) |
---|
| 496 | continue; |
---|
| 497 | } else |
---|
| 498 | if (smp->soff != 1) |
---|
| 499 | continue; |
---|
| 500 | |
---|
| 501 | /* |
---|
| 502 | * The first line of an empty file gets numbered, otherwise |
---|
| 503 | * number any existing line. |
---|
| 504 | */ |
---|
| 505 | if (smp->lno != 1 && !exist && !db_exist(sp, smp->lno)) |
---|
| 506 | break; |
---|
| 507 | |
---|
| 508 | (void)gp->scr_move(sp, smp - HMAP, 0); |
---|
| 509 | len = snprintf(nbuf, sizeof(nbuf), O_NUMBER_FMT, smp->lno); |
---|
| 510 | (void)gp->scr_addstr(sp, nbuf, len); |
---|
| 511 | } |
---|
| 512 | (void)gp->scr_move(sp, oldy, oldx); |
---|
| 513 | return (0); |
---|
| 514 | } |
---|