| 1 | /*- |
| 2 | * Copyright (c) 1990, 1993 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * |
| 5 | * This code is derived from software contributed to Berkeley by |
| 6 | * Michael Rendell of the Memorial University of Newfoundland. |
| 7 | * |
| 8 | * %sccs.include.redist.c% |
| 9 | */ |
| 10 | |
| 11 | #ifndef lint |
| 12 | static char copyright[] = |
| 13 | "@(#) Copyright (c) 1990, 1993\n\ |
| 14 | The Regents of the University of California. All rights reserved.\n"; |
| 15 | #endif /* not lint */ |
| 16 | |
| 17 | #ifndef lint |
| 18 | static char sccsid[] = "@(#)col.c 8.2 (Berkeley) %G%"; |
| 19 | #endif /* not lint */ |
| 20 | |
| 21 | #include <ctype.h> |
| 22 | #include <err.h> |
| 23 | #include <string.h> |
| 24 | #include <stdio.h> |
| 25 | #include <stdlib.h> |
| 26 | |
| 27 | #define BS '\b' /* backspace */ |
| 28 | #define TAB '\t' /* tab */ |
| 29 | #define SPACE ' ' /* space */ |
| 30 | #define NL '\n' /* newline */ |
| 31 | #define CR '\r' /* carriage return */ |
| 32 | #define ESC '\033' /* escape */ |
| 33 | #define SI '\017' /* shift in to normal character set */ |
| 34 | #define SO '\016' /* shift out to alternate character set */ |
| 35 | #define VT '\013' /* vertical tab (aka reverse line feed) */ |
| 36 | #define RLF '\007' /* ESC-07 reverse line feed */ |
| 37 | #define RHLF '\010' /* ESC-010 reverse half-line feed */ |
| 38 | #define FHLF '\011' /* ESC-011 forward half-line feed */ |
| 39 | |
| 40 | /* build up at least this many lines before flushing them out */ |
| 41 | #define BUFFER_MARGIN 32 |
| 42 | |
| 43 | typedef char CSET; |
| 44 | |
| 45 | typedef struct char_str { |
| 46 | #define CS_NORMAL 1 |
| 47 | #define CS_ALTERNATE 2 |
| 48 | short c_column; /* column character is in */ |
| 49 | CSET c_set; /* character set (currently only 2) */ |
| 50 | char c_char; /* character in question */ |
| 51 | } CHAR; |
| 52 | |
| 53 | typedef struct line_str LINE; |
| 54 | struct line_str { |
| 55 | CHAR *l_line; /* characters on the line */ |
| 56 | LINE *l_prev; /* previous line */ |
| 57 | LINE *l_next; /* next line */ |
| 58 | int l_lsize; /* allocated sizeof l_line */ |
| 59 | int l_line_len; /* strlen(l_line) */ |
| 60 | int l_needs_sort; /* set if chars went in out of order */ |
| 61 | int l_max_col; /* max column in the line */ |
| 62 | }; |
| 63 | |
| 64 | LINE *alloc_line __P((void)); |
| 65 | void dowarn __P((int)); |
| 66 | void flush_line __P((LINE *)); |
| 67 | void flush_lines __P((int)); |
| 68 | void flush_blanks __P((void)); |
| 69 | void free_line __P((LINE *)); |
| 70 | void usage __P((void)); |
| 71 | void wrerr __P((void)); |
| 72 | void *xmalloc __P((void *, size_t)); |
| 73 | |
| 74 | CSET last_set; /* char_set of last char printed */ |
| 75 | LINE *lines; |
| 76 | int compress_spaces; /* if doing space -> tab conversion */ |
| 77 | int fine; /* if `fine' resolution (half lines) */ |
| 78 | int max_bufd_lines; /* max # lines to keep in memory */ |
| 79 | int nblank_lines; /* # blanks after last flushed line */ |
| 80 | int no_backspaces; /* if not to output any backspaces */ |
| 81 | |
| 82 | #define PUTC(ch) \ |
| 83 | if (putchar(ch) == EOF) \ |
| 84 | wrerr(); |
| 85 | |
| 86 | int |
| 87 | main(argc, argv) |
| 88 | int argc; |
| 89 | char **argv; |
| 90 | { |
| 91 | int ch; |
| 92 | CHAR *c; |
| 93 | CSET cur_set; /* current character set */ |
| 94 | LINE *l; /* current line */ |
| 95 | int extra_lines; /* # of lines above first line */ |
| 96 | int cur_col; /* current column */ |
| 97 | int cur_line; /* line number of current position */ |
| 98 | int max_line; /* max value of cur_line */ |
| 99 | int this_line; /* line l points to */ |
| 100 | int nflushd_lines; /* number of lines that were flushed */ |
| 101 | int adjust, opt, warned; |
| 102 | |
| 103 | max_bufd_lines = 128; |
| 104 | compress_spaces = 1; /* compress spaces into tabs */ |
| 105 | while ((opt = getopt(argc, argv, "bfhl:x")) != EOF) |
| 106 | switch (opt) { |
| 107 | case 'b': /* do not output backspaces */ |
| 108 | no_backspaces = 1; |
| 109 | break; |
| 110 | case 'f': /* allow half forward line feeds */ |
| 111 | fine = 1; |
| 112 | break; |
| 113 | case 'h': /* compress spaces into tabs */ |
| 114 | compress_spaces = 1; |
| 115 | break; |
| 116 | case 'l': /* buffered line count */ |
| 117 | if ((max_bufd_lines = atoi(optarg)) <= 0) { |
| 118 | (void)fprintf(stderr, |
| 119 | "col: bad -l argument %s.\n", optarg); |
| 120 | exit(1); |
| 121 | } |
| 122 | break; |
| 123 | case 'x': /* do not compress spaces into tabs */ |
| 124 | compress_spaces = 0; |
| 125 | break; |
| 126 | case '?': |
| 127 | default: |
| 128 | usage(); |
| 129 | } |
| 130 | |
| 131 | if (optind != argc) |
| 132 | usage(); |
| 133 | |
| 134 | /* this value is in half lines */ |
| 135 | max_bufd_lines *= 2; |
| 136 | |
| 137 | adjust = cur_col = extra_lines = warned = 0; |
| 138 | cur_line = max_line = nflushd_lines = this_line = 0; |
| 139 | cur_set = last_set = CS_NORMAL; |
| 140 | lines = l = alloc_line(); |
| 141 | |
| 142 | while ((ch = getchar()) != EOF) { |
| 143 | if (!isgraph(ch)) { |
| 144 | switch (ch) { |
| 145 | case BS: /* can't go back further */ |
| 146 | if (cur_col == 0) |
| 147 | continue; |
| 148 | --cur_col; |
| 149 | continue; |
| 150 | case CR: |
| 151 | cur_col = 0; |
| 152 | continue; |
| 153 | case ESC: /* just ignore EOF */ |
| 154 | switch(getchar()) { |
| 155 | case RLF: |
| 156 | cur_line -= 2; |
| 157 | break; |
| 158 | case RHLF: |
| 159 | cur_line--; |
| 160 | break; |
| 161 | case FHLF: |
| 162 | cur_line++; |
| 163 | if (cur_line > max_line) |
| 164 | max_line = cur_line; |
| 165 | } |
| 166 | continue; |
| 167 | case NL: |
| 168 | cur_line += 2; |
| 169 | if (cur_line > max_line) |
| 170 | max_line = cur_line; |
| 171 | cur_col = 0; |
| 172 | continue; |
| 173 | case SPACE: |
| 174 | ++cur_col; |
| 175 | continue; |
| 176 | case SI: |
| 177 | cur_set = CS_NORMAL; |
| 178 | continue; |
| 179 | case SO: |
| 180 | cur_set = CS_ALTERNATE; |
| 181 | continue; |
| 182 | case TAB: /* adjust column */ |
| 183 | cur_col |= 7; |
| 184 | ++cur_col; |
| 185 | continue; |
| 186 | case VT: |
| 187 | cur_line -= 2; |
| 188 | continue; |
| 189 | } |
| 190 | continue; |
| 191 | } |
| 192 | |
| 193 | /* Must stuff ch in a line - are we at the right one? */ |
| 194 | if (cur_line != this_line - adjust) { |
| 195 | LINE *lnew; |
| 196 | int nmove; |
| 197 | |
| 198 | adjust = 0; |
| 199 | nmove = cur_line - this_line; |
| 200 | if (!fine) { |
| 201 | /* round up to next line */ |
| 202 | if (cur_line & 1) { |
| 203 | adjust = 1; |
| 204 | nmove++; |
| 205 | } |
| 206 | } |
| 207 | if (nmove < 0) { |
| 208 | for (; nmove < 0 && l->l_prev; nmove++) |
| 209 | l = l->l_prev; |
| 210 | if (nmove) { |
| 211 | if (nflushd_lines == 0) { |
| 212 | /* |
| 213 | * Allow backup past first |
| 214 | * line if nothing has been |
| 215 | * flushed yet. |
| 216 | */ |
| 217 | for (; nmove < 0; nmove++) { |
| 218 | lnew = alloc_line(); |
| 219 | l->l_prev = lnew; |
| 220 | lnew->l_next = l; |
| 221 | l = lines = lnew; |
| 222 | extra_lines++; |
| 223 | } |
| 224 | } else { |
| 225 | if (!warned++) |
| 226 | dowarn(cur_line); |
| 227 | cur_line -= nmove; |
| 228 | } |
| 229 | } |
| 230 | } else { |
| 231 | /* may need to allocate here */ |
| 232 | for (; nmove > 0 && l->l_next; nmove--) |
| 233 | l = l->l_next; |
| 234 | for (; nmove > 0; nmove--) { |
| 235 | lnew = alloc_line(); |
| 236 | lnew->l_prev = l; |
| 237 | l->l_next = lnew; |
| 238 | l = lnew; |
| 239 | } |
| 240 | } |
| 241 | this_line = cur_line + adjust; |
| 242 | nmove = this_line - nflushd_lines; |
| 243 | if (nmove >= max_bufd_lines + BUFFER_MARGIN) { |
| 244 | nflushd_lines += nmove - max_bufd_lines; |
| 245 | flush_lines(nmove - max_bufd_lines); |
| 246 | } |
| 247 | } |
| 248 | /* grow line's buffer? */ |
| 249 | if (l->l_line_len + 1 >= l->l_lsize) { |
| 250 | int need; |
| 251 | |
| 252 | need = l->l_lsize ? l->l_lsize * 2 : 90; |
| 253 | l->l_line = (CHAR *)xmalloc((void *) l->l_line, |
| 254 | (unsigned) need * sizeof(CHAR)); |
| 255 | l->l_lsize = need; |
| 256 | } |
| 257 | c = &l->l_line[l->l_line_len++]; |
| 258 | c->c_char = ch; |
| 259 | c->c_set = cur_set; |
| 260 | c->c_column = cur_col; |
| 261 | /* |
| 262 | * If things are put in out of order, they will need sorting |
| 263 | * when it is flushed. |
| 264 | */ |
| 265 | if (cur_col < l->l_max_col) |
| 266 | l->l_needs_sort = 1; |
| 267 | else |
| 268 | l->l_max_col = cur_col; |
| 269 | cur_col++; |
| 270 | } |
| 271 | /* goto the last line that had a character on it */ |
| 272 | for (; l->l_next; l = l->l_next) |
| 273 | this_line++; |
| 274 | flush_lines(this_line - nflushd_lines + extra_lines + 1); |
| 275 | |
| 276 | /* make sure we leave things in a sane state */ |
| 277 | if (last_set != CS_NORMAL) |
| 278 | PUTC('\017'); |
| 279 | |
| 280 | /* flush out the last few blank lines */ |
| 281 | nblank_lines = max_line - this_line; |
| 282 | if (max_line & 1) |
| 283 | nblank_lines++; |
| 284 | else if (!nblank_lines) |
| 285 | /* missing a \n on the last line? */ |
| 286 | nblank_lines = 2; |
| 287 | flush_blanks(); |
| 288 | exit(0); |
| 289 | } |
| 290 | |
| 291 | void |
| 292 | flush_lines(nflush) |
| 293 | int nflush; |
| 294 | { |
| 295 | LINE *l; |
| 296 | |
| 297 | while (--nflush >= 0) { |
| 298 | l = lines; |
| 299 | lines = l->l_next; |
| 300 | if (l->l_line) { |
| 301 | flush_blanks(); |
| 302 | flush_line(l); |
| 303 | } |
| 304 | nblank_lines++; |
| 305 | if (l->l_line) |
| 306 | (void)free((void *)l->l_line); |
| 307 | free_line(l); |
| 308 | } |
| 309 | if (lines) |
| 310 | lines->l_prev = NULL; |
| 311 | } |
| 312 | |
| 313 | /* |
| 314 | * Print a number of newline/half newlines. If fine flag is set, nblank_lines |
| 315 | * is the number of half line feeds, otherwise it is the number of whole line |
| 316 | * feeds. |
| 317 | */ |
| 318 | void |
| 319 | flush_blanks() |
| 320 | { |
| 321 | int half, i, nb; |
| 322 | |
| 323 | half = 0; |
| 324 | nb = nblank_lines; |
| 325 | if (nb & 1) { |
| 326 | if (fine) |
| 327 | half = 1; |
| 328 | else |
| 329 | nb++; |
| 330 | } |
| 331 | nb /= 2; |
| 332 | for (i = nb; --i >= 0;) |
| 333 | PUTC('\n'); |
| 334 | if (half) { |
| 335 | PUTC('\033'); |
| 336 | PUTC('9'); |
| 337 | if (!nb) |
| 338 | PUTC('\r'); |
| 339 | } |
| 340 | nblank_lines = 0; |
| 341 | } |
| 342 | |
| 343 | /* |
| 344 | * Write a line to stdout taking care of space to tab conversion (-h flag) |
| 345 | * and character set shifts. |
| 346 | */ |
| 347 | void |
| 348 | flush_line(l) |
| 349 | LINE *l; |
| 350 | { |
| 351 | CHAR *c, *endc; |
| 352 | int nchars, last_col, this_col; |
| 353 | |
| 354 | last_col = 0; |
| 355 | nchars = l->l_line_len; |
| 356 | |
| 357 | if (l->l_needs_sort) { |
| 358 | static CHAR *sorted; |
| 359 | static int count_size, *count, i, save, sorted_size, tot; |
| 360 | |
| 361 | /* |
| 362 | * Do an O(n) sort on l->l_line by column being careful to |
| 363 | * preserve the order of characters in the same column. |
| 364 | */ |
| 365 | if (l->l_lsize > sorted_size) { |
| 366 | sorted_size = l->l_lsize; |
| 367 | sorted = (CHAR *)xmalloc((void *)sorted, |
| 368 | (unsigned)sizeof(CHAR) * sorted_size); |
| 369 | } |
| 370 | if (l->l_max_col >= count_size) { |
| 371 | count_size = l->l_max_col + 1; |
| 372 | count = (int *)xmalloc((void *)count, |
| 373 | (unsigned)sizeof(int) * count_size); |
| 374 | } |
| 375 | memset((char *)count, 0, sizeof(int) * l->l_max_col + 1); |
| 376 | for (i = nchars, c = l->l_line; --i >= 0; c++) |
| 377 | count[c->c_column]++; |
| 378 | |
| 379 | /* |
| 380 | * calculate running total (shifted down by 1) to use as |
| 381 | * indices into new line. |
| 382 | */ |
| 383 | for (tot = 0, i = 0; i <= l->l_max_col; i++) { |
| 384 | save = count[i]; |
| 385 | count[i] = tot; |
| 386 | tot += save; |
| 387 | } |
| 388 | |
| 389 | for (i = nchars, c = l->l_line; --i >= 0; c++) |
| 390 | sorted[count[c->c_column]++] = *c; |
| 391 | c = sorted; |
| 392 | } else |
| 393 | c = l->l_line; |
| 394 | while (nchars > 0) { |
| 395 | this_col = c->c_column; |
| 396 | endc = c; |
| 397 | do { |
| 398 | ++endc; |
| 399 | } while (--nchars > 0 && this_col == endc->c_column); |
| 400 | |
| 401 | /* if -b only print last character */ |
| 402 | if (no_backspaces) |
| 403 | c = endc - 1; |
| 404 | |
| 405 | if (this_col > last_col) { |
| 406 | int nspace = this_col - last_col; |
| 407 | |
| 408 | if (compress_spaces && nspace > 1) { |
| 409 | int ntabs; |
| 410 | |
| 411 | ntabs = this_col / 8 - last_col / 8; |
| 412 | nspace -= ntabs * 8; |
| 413 | while (--ntabs >= 0) |
| 414 | PUTC('\t'); |
| 415 | } |
| 416 | while (--nspace >= 0) |
| 417 | PUTC(' '); |
| 418 | last_col = this_col; |
| 419 | } |
| 420 | last_col++; |
| 421 | |
| 422 | for (;;) { |
| 423 | if (c->c_set != last_set) { |
| 424 | switch (c->c_set) { |
| 425 | case CS_NORMAL: |
| 426 | PUTC('\017'); |
| 427 | break; |
| 428 | case CS_ALTERNATE: |
| 429 | PUTC('\016'); |
| 430 | } |
| 431 | last_set = c->c_set; |
| 432 | } |
| 433 | PUTC(c->c_char); |
| 434 | if (++c >= endc) |
| 435 | break; |
| 436 | PUTC('\b'); |
| 437 | } |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | #define NALLOC 64 |
| 442 | |
| 443 | static LINE *line_freelist; |
| 444 | |
| 445 | LINE * |
| 446 | alloc_line() |
| 447 | { |
| 448 | LINE *l; |
| 449 | int i; |
| 450 | |
| 451 | if (!line_freelist) { |
| 452 | l = (LINE *)xmalloc((void *)NULL, sizeof(LINE) * NALLOC); |
| 453 | line_freelist = l; |
| 454 | for (i = 1; i < NALLOC; i++, l++) |
| 455 | l->l_next = l + 1; |
| 456 | l->l_next = NULL; |
| 457 | } |
| 458 | l = line_freelist; |
| 459 | line_freelist = l->l_next; |
| 460 | |
| 461 | memset(l, 0, sizeof(LINE)); |
| 462 | return (l); |
| 463 | } |
| 464 | |
| 465 | void |
| 466 | free_line(l) |
| 467 | LINE *l; |
| 468 | { |
| 469 | |
| 470 | l->l_next = line_freelist; |
| 471 | line_freelist = l; |
| 472 | } |
| 473 | |
| 474 | void * |
| 475 | xmalloc(p, size) |
| 476 | void *p; |
| 477 | size_t size; |
| 478 | { |
| 479 | |
| 480 | if (!(p = (void *)realloc(p, size))) |
| 481 | err(1, NULL); |
| 482 | return (p); |
| 483 | } |
| 484 | |
| 485 | void |
| 486 | usage() |
| 487 | { |
| 488 | |
| 489 | (void)fprintf(stderr, "usage: col [-bfx] [-l nline]\n"); |
| 490 | exit(1); |
| 491 | } |
| 492 | |
| 493 | void |
| 494 | wrerr() |
| 495 | { |
| 496 | |
| 497 | (void)fprintf(stderr, "col: write error.\n"); |
| 498 | exit(1); |
| 499 | } |
| 500 | |
| 501 | void |
| 502 | dowarn(line) |
| 503 | int line; |
| 504 | { |
| 505 | |
| 506 | warnx("warning: can't back up %s", |
| 507 | line < 0 ? "past first line" : "-- line already flushed"); |
| 508 | } |