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6dbe3af9 KZ |
1 | /*- |
2 | * Copyright (c) 1990 The Regents of the University of California. | |
3 | * 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 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. All advertising materials mentioning features or use of this software | |
17 | * must display the following acknowledgement: | |
18 | * This product includes software developed by the University of | |
19 | * California, Berkeley and its contributors. | |
20 | * 4. Neither the name of the University nor the names of its contributors | |
21 | * may be used to endorse or promote products derived from this software | |
22 | * without specific prior written permission. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
34 | * SUCH DAMAGE. | |
35 | * | |
36 | * Wed Jun 22 22:15:41 1994, faith@cs.unc.edu: Added internationalization | |
37 | * patches from Andries.Brouwer@cwi.nl | |
38 | * Wed Sep 14 22:31:17 1994: patches from Carl Christofferson | |
39 | * (cchris@connected.com) | |
b50945d4 | 40 | * 1999-02-22 Arkadiusz MiĆkiewicz <misiek@pld.ORG.PL> |
eb63b9b8 KZ |
41 | * added Native Language Support |
42 | * 1999-09-19 Bruno Haible <haible@clisp.cons.org> | |
43 | * modified to work correctly in multi-byte locales | |
7eda085c | 44 | * |
6dbe3af9 KZ |
45 | */ |
46 | ||
7d2600e2 SK |
47 | /* |
48 | * This command is deprecated. The utility is in maintenance mode, | |
49 | * meaning we keep them in source tree for backward compatibility | |
50 | * only. Do not waste time making this command better, unless the | |
51 | * fix is about security or other very critical issue. | |
52 | * | |
53 | * See Documentation/deprecated.txt for more information. | |
54 | */ | |
55 | ||
fd6b7a7f | 56 | #include <stdlib.h> |
6dbe3af9 KZ |
57 | #include <errno.h> |
58 | #include <ctype.h> | |
59 | #include <string.h> | |
60 | #include <stdio.h> | |
fd6b7a7f | 61 | #include <unistd.h> |
f688c298 | 62 | #include <getopt.h> |
eb63b9b8 | 63 | |
04faca4a DB |
64 | #include "nls.h" |
65 | #include "xalloc.h" | |
eb63b9b8 | 66 | #include "widechar.h" |
b07e72d9 | 67 | #include "strutils.h" |
b87cbe84 | 68 | #include "closestream.h" |
6dbe3af9 KZ |
69 | |
70 | #define BS '\b' /* backspace */ | |
71 | #define TAB '\t' /* tab */ | |
72 | #define SPACE ' ' /* space */ | |
73 | #define NL '\n' /* newline */ | |
74 | #define CR '\r' /* carriage return */ | |
75 | #define ESC '\033' /* escape */ | |
76 | #define SI '\017' /* shift in to normal character set */ | |
77 | #define SO '\016' /* shift out to alternate character set */ | |
78 | #define VT '\013' /* vertical tab (aka reverse line feed) */ | |
79 | #define RLF '\007' /* ESC-07 reverse line feed */ | |
80 | #define RHLF '\010' /* ESC-010 reverse half-line feed */ | |
81 | #define FHLF '\011' /* ESC-011 forward half-line feed */ | |
82 | ||
83 | /* build up at least this many lines before flushing them out */ | |
84 | #define BUFFER_MARGIN 32 | |
85 | ||
86 | typedef char CSET; | |
87 | ||
88 | typedef struct char_str { | |
89 | #define CS_NORMAL 1 | |
90 | #define CS_ALTERNATE 2 | |
004356f0 | 91 | int c_column; /* column character is in */ |
6dbe3af9 | 92 | CSET c_set; /* character set (currently only 2) */ |
eb63b9b8 | 93 | wchar_t c_char; /* character in question */ |
66ee8158 | 94 | int c_width; /* character width */ |
6dbe3af9 KZ |
95 | } CHAR; |
96 | ||
97 | typedef struct line_str LINE; | |
98 | struct line_str { | |
99 | CHAR *l_line; /* characters on the line */ | |
100 | LINE *l_prev; /* previous line */ | |
101 | LINE *l_next; /* next line */ | |
102 | int l_lsize; /* allocated sizeof l_line */ | |
103 | int l_line_len; /* strlen(l_line) */ | |
104 | int l_needs_sort; /* set if chars went in out of order */ | |
105 | int l_max_col; /* max column in the line */ | |
106 | }; | |
107 | ||
fd6b7a7f KZ |
108 | void free_line(LINE *l); |
109 | void flush_line(LINE *l); | |
110 | void flush_lines(int); | |
111 | void flush_blanks(void); | |
fd6b7a7f | 112 | LINE *alloc_line(void); |
6dbe3af9 | 113 | |
2ba641e5 SK |
114 | static CSET last_set; /* char_set of last char printed */ |
115 | static LINE *lines; | |
116 | static int compress_spaces; /* if doing space -> tab conversion */ | |
117 | static int fine; /* if `fine' resolution (half lines) */ | |
118 | static unsigned max_bufd_lines; /* max # lines to keep in memory */ | |
119 | static int nblank_lines; /* # blanks after last flushed line */ | |
120 | static int no_backspaces; /* if not to output any backspaces */ | |
121 | static int pass_unknown_seqs; /* whether to pass unknown control sequences */ | |
6dbe3af9 KZ |
122 | |
123 | #define PUTC(ch) \ | |
eb63b9b8 | 124 | if (putwchar(ch) == WEOF) \ |
6dbe3af9 KZ |
125 | wrerr(); |
126 | ||
6e1eda6f | 127 | static void __attribute__((__noreturn__)) usage(void) |
2ebef870 | 128 | { |
6e1eda6f | 129 | FILE *out = stdout; |
f688c298 SK |
130 | fprintf(out, _( |
131 | "\nUsage:\n" | |
132 | " %s [options]\n"), program_invocation_short_name); | |
133 | ||
451dbcfa BS |
134 | fputs(USAGE_SEPARATOR, out); |
135 | fputs(_("Filter out reverse line feeds.\n"), out); | |
136 | ||
f688c298 SK |
137 | fprintf(out, _( |
138 | "\nOptions:\n" | |
139 | " -b, --no-backspaces do not output backspaces\n" | |
140 | " -f, --fine permit forward half line feeds\n" | |
141 | " -p, --pass pass unknown control sequences\n" | |
142 | " -h, --tabs convert spaces to tabs\n" | |
143 | " -x, --spaces convert tabs to spaces\n" | |
144 | " -l, --lines NUM buffer at least NUM lines\n" | |
b3054454 RM |
145 | )); |
146 | printf( " -H, --help %s\n", USAGE_OPTSTR_HELP); | |
147 | printf( " -V, --version %s\n", USAGE_OPTSTR_VERSION); | |
f688c298 | 148 | |
b3054454 | 149 | fputs(USAGE_SEPARATOR, out); |
f688c298 SK |
150 | fprintf(out, _( |
151 | "%s reads from standard input and writes to standard output\n\n"), | |
152 | program_invocation_short_name); | |
153 | ||
f45f3ec3 | 154 | printf(USAGE_MAN_TAIL("col(1)")); |
6e1eda6f | 155 | exit(EXIT_SUCCESS); |
2ebef870 KZ |
156 | } |
157 | ||
0825179f | 158 | static void __attribute__((__noreturn__)) wrerr(void) |
2ebef870 | 159 | { |
48899b9e | 160 | errx(EXIT_FAILURE, _("write error")); |
2ebef870 KZ |
161 | } |
162 | ||
fd6b7a7f | 163 | int main(int argc, char **argv) |
6dbe3af9 | 164 | { |
eb63b9b8 | 165 | register wint_t ch; |
26c91027 | 166 | CHAR *c = NULL; |
6dbe3af9 KZ |
167 | CSET cur_set; /* current character set */ |
168 | LINE *l; /* current line */ | |
169 | int extra_lines; /* # of lines above first line */ | |
170 | int cur_col; /* current column */ | |
171 | int cur_line; /* line number of current position */ | |
172 | int max_line; /* max value of cur_line */ | |
173 | int this_line; /* line l points to */ | |
174 | int nflushd_lines; /* number of lines that were flushed */ | |
175 | int adjust, opt, warned; | |
2ebef870 | 176 | int ret = EXIT_SUCCESS; |
6dbe3af9 | 177 | |
f688c298 | 178 | static const struct option longopts[] = { |
87918040 SK |
179 | { "no-backspaces", no_argument, NULL, 'b' }, |
180 | { "fine", no_argument, NULL, 'f' }, | |
181 | { "pass", no_argument, NULL, 'p' }, | |
182 | { "tabs", no_argument, NULL, 'h' }, | |
183 | { "spaces", no_argument, NULL, 'x' }, | |
184 | { "lines", required_argument, NULL, 'l' }, | |
185 | { "version", no_argument, NULL, 'V' }, | |
186 | { "help", no_argument, NULL, 'H' }, | |
187 | { NULL, 0, NULL, 0 } | |
f688c298 SK |
188 | }; |
189 | ||
7eda085c KZ |
190 | setlocale(LC_ALL, ""); |
191 | bindtextdomain(PACKAGE, LOCALEDIR); | |
192 | textdomain(PACKAGE); | |
2c308875 | 193 | close_stdout_atexit(); |
2ebef870 | 194 | |
b07e72d9 | 195 | max_bufd_lines = 128 * 2; |
6dbe3af9 | 196 | compress_spaces = 1; /* compress spaces into tabs */ |
22853e4a | 197 | pass_unknown_seqs = 0; /* remove unknown escape sequences */ |
f688c298 SK |
198 | |
199 | while ((opt = getopt_long(argc, argv, "bfhl:pxVH", longopts, NULL)) != -1) | |
6dbe3af9 KZ |
200 | switch (opt) { |
201 | case 'b': /* do not output backspaces */ | |
202 | no_backspaces = 1; | |
203 | break; | |
204 | case 'f': /* allow half forward line feeds */ | |
205 | fine = 1; | |
206 | break; | |
207 | case 'h': /* compress spaces into tabs */ | |
208 | compress_spaces = 1; | |
209 | break; | |
b07e72d9 SK |
210 | case 'l': |
211 | /* | |
212 | * Buffered line count, which is a value in half | |
213 | * lines e.g. twice the amount specified. | |
214 | */ | |
3b56eea7 | 215 | max_bufd_lines = strtou32_or_err(optarg, _("bad -l argument")) * 2; |
6dbe3af9 | 216 | break; |
22853e4a KZ |
217 | case 'p': |
218 | pass_unknown_seqs = 1; | |
219 | break; | |
6dbe3af9 KZ |
220 | case 'x': /* do not compress spaces into tabs */ |
221 | compress_spaces = 0; | |
222 | break; | |
2c308875 | 223 | |
f688c298 | 224 | case 'V': |
2c308875 | 225 | print_version(EXIT_SUCCESS); |
f688c298 | 226 | case 'H': |
6e1eda6f | 227 | usage(); |
6dbe3af9 | 228 | default: |
677ec86c | 229 | errtryhelp(EXIT_FAILURE); |
6dbe3af9 KZ |
230 | } |
231 | ||
6e1eda6f RM |
232 | if (optind != argc) { |
233 | warnx(_("bad usage")); | |
234 | errtryhelp(EXIT_FAILURE); | |
235 | } | |
6dbe3af9 | 236 | |
6dbe3af9 KZ |
237 | adjust = cur_col = extra_lines = warned = 0; |
238 | cur_line = max_line = nflushd_lines = this_line = 0; | |
239 | cur_set = last_set = CS_NORMAL; | |
240 | lines = l = alloc_line(); | |
2ebef870 | 241 | |
8e0ec3b4 | 242 | while (feof(stdin) == 0) { |
e9ce5ccc KZ |
243 | errno = 0; |
244 | if ((ch = getwchar()) == WEOF) { | |
8e0ec3b4 | 245 | if (errno == EILSEQ) { |
cc06250f | 246 | warn(_("failed on line %d"), max_line + 1); |
2ebef870 | 247 | ret = EXIT_FAILURE; |
e9ce5ccc KZ |
248 | } |
249 | break; | |
2ebef870 | 250 | } |
eb63b9b8 | 251 | if (!iswgraph(ch)) { |
6dbe3af9 KZ |
252 | switch (ch) { |
253 | case BS: /* can't go back further */ | |
254 | if (cur_col == 0) | |
255 | continue; | |
26c91027 GM |
256 | if (c) |
257 | cur_col -= c->c_width; | |
258 | else | |
259 | cur_col--; | |
6dbe3af9 KZ |
260 | continue; |
261 | case CR: | |
262 | cur_col = 0; | |
263 | continue; | |
264 | case ESC: /* just ignore EOF */ | |
eb63b9b8 | 265 | switch(getwchar()) { |
6dbe3af9 KZ |
266 | case RLF: |
267 | cur_line -= 2; | |
268 | break; | |
269 | case RHLF: | |
270 | cur_line--; | |
271 | break; | |
272 | case FHLF: | |
273 | cur_line++; | |
274 | if (cur_line > max_line) | |
275 | max_line = cur_line; | |
276 | } | |
277 | continue; | |
278 | case NL: | |
279 | cur_line += 2; | |
280 | if (cur_line > max_line) | |
281 | max_line = cur_line; | |
282 | cur_col = 0; | |
283 | continue; | |
284 | case SPACE: | |
285 | ++cur_col; | |
286 | continue; | |
287 | case SI: | |
288 | cur_set = CS_NORMAL; | |
289 | continue; | |
290 | case SO: | |
291 | cur_set = CS_ALTERNATE; | |
292 | continue; | |
293 | case TAB: /* adjust column */ | |
294 | cur_col |= 7; | |
295 | ++cur_col; | |
296 | continue; | |
297 | case VT: | |
298 | cur_line -= 2; | |
299 | continue; | |
300 | } | |
66ee8158 KZ |
301 | if (iswspace(ch)) { |
302 | if (wcwidth(ch) > 0) | |
303 | cur_col += wcwidth(ch); | |
304 | continue; | |
305 | } | |
22853e4a KZ |
306 | if (!pass_unknown_seqs) |
307 | continue; | |
6dbe3af9 KZ |
308 | } |
309 | ||
310 | /* Must stuff ch in a line - are we at the right one? */ | |
311 | if (cur_line != this_line - adjust) { | |
312 | LINE *lnew; | |
313 | int nmove; | |
314 | ||
315 | adjust = 0; | |
316 | nmove = cur_line - this_line; | |
317 | if (!fine) { | |
318 | /* round up to next line */ | |
319 | if (cur_line & 1) { | |
320 | adjust = 1; | |
321 | nmove++; | |
322 | } | |
323 | } | |
324 | if (nmove < 0) { | |
325 | for (; nmove < 0 && l->l_prev; nmove++) | |
326 | l = l->l_prev; | |
327 | if (nmove) { | |
328 | if (nflushd_lines == 0) { | |
329 | /* | |
330 | * Allow backup past first | |
331 | * line if nothing has been | |
332 | * flushed yet. | |
333 | */ | |
334 | for (; nmove < 0; nmove++) { | |
335 | lnew = alloc_line(); | |
336 | l->l_prev = lnew; | |
337 | lnew->l_next = l; | |
338 | l = lines = lnew; | |
339 | extra_lines++; | |
340 | } | |
341 | } else { | |
342 | if (!warned++) | |
2ebef870 KZ |
343 | warnx( |
344 | _("warning: can't back up %s."), cur_line < 0 ? | |
345 | _("past first line") : _("-- line already flushed")); | |
6dbe3af9 KZ |
346 | cur_line -= nmove; |
347 | } | |
348 | } | |
349 | } else { | |
350 | /* may need to allocate here */ | |
351 | for (; nmove > 0 && l->l_next; nmove--) | |
352 | l = l->l_next; | |
353 | for (; nmove > 0; nmove--) { | |
354 | lnew = alloc_line(); | |
355 | lnew->l_prev = l; | |
356 | l->l_next = lnew; | |
357 | l = lnew; | |
358 | } | |
359 | } | |
360 | this_line = cur_line + adjust; | |
361 | nmove = this_line - nflushd_lines; | |
3b56eea7 KZ |
362 | if (nmove > 0 |
363 | && (unsigned) nmove >= max_bufd_lines + BUFFER_MARGIN) { | |
6dbe3af9 KZ |
364 | nflushd_lines += nmove - max_bufd_lines; |
365 | flush_lines(nmove - max_bufd_lines); | |
366 | } | |
367 | } | |
368 | /* grow line's buffer? */ | |
369 | if (l->l_line_len + 1 >= l->l_lsize) { | |
370 | int need; | |
371 | ||
372 | need = l->l_lsize ? l->l_lsize * 2 : 90; | |
fea1cbf7 | 373 | l->l_line = xrealloc((void *) l->l_line, |
04faca4a | 374 | (unsigned) need * sizeof(CHAR)); |
6dbe3af9 KZ |
375 | l->l_lsize = need; |
376 | } | |
377 | c = &l->l_line[l->l_line_len++]; | |
378 | c->c_char = ch; | |
379 | c->c_set = cur_set; | |
26c91027 GM |
380 | if (0 < cur_col) |
381 | c->c_column = cur_col; | |
382 | else | |
383 | c->c_column = 0; | |
66ee8158 | 384 | c->c_width = wcwidth(ch); |
6dbe3af9 KZ |
385 | /* |
386 | * If things are put in out of order, they will need sorting | |
387 | * when it is flushed. | |
388 | */ | |
389 | if (cur_col < l->l_max_col) | |
390 | l->l_needs_sort = 1; | |
391 | else | |
392 | l->l_max_col = cur_col; | |
66ee8158 KZ |
393 | if (c->c_width > 0) |
394 | cur_col += c->c_width; | |
6dbe3af9 KZ |
395 | } |
396 | /* goto the last line that had a character on it */ | |
397 | for (; l->l_next; l = l->l_next) | |
398 | this_line++; | |
b6b5272b SK |
399 | if (max_line == 0) |
400 | return EXIT_SUCCESS; /* no lines, so just exit */ | |
6dbe3af9 KZ |
401 | flush_lines(this_line - nflushd_lines + extra_lines + 1); |
402 | ||
403 | /* make sure we leave things in a sane state */ | |
404 | if (last_set != CS_NORMAL) | |
405 | PUTC('\017'); | |
406 | ||
407 | /* flush out the last few blank lines */ | |
408 | nblank_lines = max_line - this_line; | |
409 | if (max_line & 1) | |
410 | nblank_lines++; | |
411 | else if (!nblank_lines) | |
412 | /* missing a \n on the last line? */ | |
413 | nblank_lines = 2; | |
414 | flush_blanks(); | |
e9ce5ccc | 415 | return ret; |
6dbe3af9 KZ |
416 | } |
417 | ||
fd6b7a7f | 418 | void flush_lines(int nflush) |
6dbe3af9 KZ |
419 | { |
420 | LINE *l; | |
421 | ||
422 | while (--nflush >= 0) { | |
423 | l = lines; | |
424 | lines = l->l_next; | |
425 | if (l->l_line) { | |
426 | flush_blanks(); | |
427 | flush_line(l); | |
428 | } | |
429 | nblank_lines++; | |
9e01635e | 430 | free((void *)l->l_line); |
6dbe3af9 KZ |
431 | free_line(l); |
432 | } | |
433 | if (lines) | |
434 | lines->l_prev = NULL; | |
435 | } | |
436 | ||
437 | /* | |
438 | * Print a number of newline/half newlines. If fine flag is set, nblank_lines | |
439 | * is the number of half line feeds, otherwise it is the number of whole line | |
440 | * feeds. | |
441 | */ | |
3acc206d | 442 | void flush_blanks(void) |
6dbe3af9 KZ |
443 | { |
444 | int half, i, nb; | |
445 | ||
446 | half = 0; | |
447 | nb = nblank_lines; | |
448 | if (nb & 1) { | |
449 | if (fine) | |
450 | half = 1; | |
451 | else | |
452 | nb++; | |
453 | } | |
454 | nb /= 2; | |
455 | for (i = nb; --i >= 0;) | |
456 | PUTC('\n'); | |
457 | if (half) { | |
458 | PUTC('\033'); | |
459 | PUTC('9'); | |
460 | if (!nb) | |
461 | PUTC('\r'); | |
462 | } | |
463 | nblank_lines = 0; | |
464 | } | |
465 | ||
466 | /* | |
467 | * Write a line to stdout taking care of space to tab conversion (-h flag) | |
468 | * and character set shifts. | |
469 | */ | |
fd6b7a7f | 470 | void flush_line(LINE *l) |
6dbe3af9 KZ |
471 | { |
472 | CHAR *c, *endc; | |
473 | int nchars, last_col, this_col; | |
474 | ||
475 | last_col = 0; | |
476 | nchars = l->l_line_len; | |
477 | ||
478 | if (l->l_needs_sort) { | |
004356f0 KZ |
479 | static CHAR *sorted = NULL; |
480 | static int count_size = 0, *count = NULL, sorted_size = 0; | |
481 | int i, tot; | |
6dbe3af9 KZ |
482 | |
483 | /* | |
484 | * Do an O(n) sort on l->l_line by column being careful to | |
485 | * preserve the order of characters in the same column. | |
486 | */ | |
487 | if (l->l_lsize > sorted_size) { | |
488 | sorted_size = l->l_lsize; | |
fea1cbf7 | 489 | sorted = xrealloc((void *)sorted, |
04faca4a | 490 | (unsigned)sizeof(CHAR) * sorted_size); |
6dbe3af9 KZ |
491 | } |
492 | if (l->l_max_col >= count_size) { | |
493 | count_size = l->l_max_col + 1; | |
04faca4a | 494 | count = (int *)xrealloc((void *)count, |
6dbe3af9 KZ |
495 | (unsigned)sizeof(int) * count_size); |
496 | } | |
22853e4a | 497 | memset(count, 0, sizeof(int) * l->l_max_col + 1); |
004356f0 | 498 | for (i = nchars, c = l->l_line; c && --i >= 0; c++) |
6dbe3af9 KZ |
499 | count[c->c_column]++; |
500 | ||
501 | /* | |
502 | * calculate running total (shifted down by 1) to use as | |
503 | * indices into new line. | |
504 | */ | |
505 | for (tot = 0, i = 0; i <= l->l_max_col; i++) { | |
004356f0 | 506 | int save = count[i]; |
6dbe3af9 KZ |
507 | count[i] = tot; |
508 | tot += save; | |
509 | } | |
510 | ||
511 | for (i = nchars, c = l->l_line; --i >= 0; c++) | |
512 | sorted[count[c->c_column]++] = *c; | |
513 | c = sorted; | |
514 | } else | |
515 | c = l->l_line; | |
516 | while (nchars > 0) { | |
517 | this_col = c->c_column; | |
518 | endc = c; | |
519 | do { | |
520 | ++endc; | |
521 | } while (--nchars > 0 && this_col == endc->c_column); | |
522 | ||
523 | /* if -b only print last character */ | |
66ee8158 | 524 | if (no_backspaces) { |
6dbe3af9 | 525 | c = endc - 1; |
66ee8158 KZ |
526 | if (nchars > 0 && |
527 | this_col + c->c_width > endc->c_column) | |
528 | continue; | |
529 | } | |
6dbe3af9 KZ |
530 | |
531 | if (this_col > last_col) { | |
532 | int nspace = this_col - last_col; | |
533 | ||
534 | if (compress_spaces && nspace > 1) { | |
535 | int ntabs; | |
536 | ||
537 | ntabs = this_col / 8 - last_col / 8; | |
8e0ec3b4 SK |
538 | if (ntabs > 0) { |
539 | nspace = this_col & 7; | |
540 | while (--ntabs >= 0) | |
541 | PUTC('\t'); | |
542 | } | |
6dbe3af9 KZ |
543 | } |
544 | while (--nspace >= 0) | |
545 | PUTC(' '); | |
546 | last_col = this_col; | |
547 | } | |
6dbe3af9 KZ |
548 | |
549 | for (;;) { | |
550 | if (c->c_set != last_set) { | |
551 | switch (c->c_set) { | |
552 | case CS_NORMAL: | |
553 | PUTC('\017'); | |
554 | break; | |
555 | case CS_ALTERNATE: | |
556 | PUTC('\016'); | |
557 | } | |
558 | last_set = c->c_set; | |
559 | } | |
560 | PUTC(c->c_char); | |
8e0ec3b4 | 561 | if ((c + 1) < endc) { |
66ee8158 KZ |
562 | int i; |
563 | for (i=0; i < c->c_width; i++) | |
564 | PUTC('\b'); | |
565 | } | |
6dbe3af9 KZ |
566 | if (++c >= endc) |
567 | break; | |
6dbe3af9 | 568 | } |
8e0ec3b4 | 569 | last_col += (c - 1)->c_width; |
6dbe3af9 KZ |
570 | } |
571 | } | |
572 | ||
573 | #define NALLOC 64 | |
574 | ||
575 | static LINE *line_freelist; | |
576 | ||
577 | LINE * | |
3acc206d | 578 | alloc_line(void) |
6dbe3af9 KZ |
579 | { |
580 | LINE *l; | |
581 | int i; | |
582 | ||
583 | if (!line_freelist) { | |
04faca4a | 584 | l = xmalloc(sizeof(LINE) * NALLOC); |
6dbe3af9 KZ |
585 | line_freelist = l; |
586 | for (i = 1; i < NALLOC; i++, l++) | |
587 | l->l_next = l + 1; | |
588 | l->l_next = NULL; | |
589 | } | |
590 | l = line_freelist; | |
591 | line_freelist = l->l_next; | |
592 | ||
22853e4a | 593 | memset(l, 0, sizeof(LINE)); |
8e0ec3b4 | 594 | return l; |
6dbe3af9 KZ |
595 | } |
596 | ||
fd6b7a7f | 597 | void free_line(LINE *l) |
6dbe3af9 KZ |
598 | { |
599 | l->l_next = line_freelist; | |
600 | line_freelist = l; | |
601 | } |