Annotation of src/usr.bin/fmt/fmt.c, Revision 1.26
1.26 ! tedu 1: /* $OpenBSD: fmt.c,v 1.25 2006/11/29 21:59:04 jmc Exp $ */
1.1 deraadt 2:
1.10 millert 3: /* Sensible version of fmt
4: *
5: * Syntax: fmt [ options ] [ goal [ max ] ] [ filename ... ]
6: *
7: * Since the documentation for the original fmt is so poor, here
8: * is an accurate description of what this one does. It's usually
9: * the same. The *mechanism* used may differ from that suggested
10: * here. Note that we are *not* entirely compatible with fmt,
11: * because fmt gets so many things wrong.
12: *
13: * 1. Tabs are expanded, assuming 8-space tab stops.
14: * If the `-t <n>' option is given, we assume <n>-space
15: * tab stops instead.
16: * Trailing blanks are removed from all lines.
17: * x\b == nothing, for any x other than \b.
18: * Other control characters are simply stripped. This
19: * includes \r.
20: * 2. Each line is split into leading whitespace and
21: * everything else. Maximal consecutive sequences of
22: * lines with the same leading whitespace are considered
23: * to form paragraphs, except that a blank line is always
24: * a paragraph to itself.
25: * If the `-p' option is given then the first line of a
26: * paragraph is permitted to have indentation different
27: * from that of the other lines.
28: * If the `-m' option is given then a line that looks
29: * like a mail message header, if it is not immediately
30: * preceded by a non-blank non-message-header line, is
31: * taken to start a new paragraph, which also contains
32: * any subsequent lines with non-empty leading whitespace.
1.19 millert 33: * Unless the `-n' option is given, lines beginning with
34: * a . (dot) are not formatted.
1.10 millert 35: * 3. The "everything else" is split into words; a word
36: * includes its trailing whitespace, and a word at the
37: * end of a line is deemed to be followed by a single
38: * space, or two spaces if it ends with a sentence-end
39: * character. (See the `-d' option for how to change that.)
40: * If the `-s' option has been given, then a word's trailing
41: * whitespace is replaced by what it would have had if it
42: * had occurred at end of line.
43: * 4. Each paragraph is sent to standard output as follows.
44: * We output the leading whitespace, and then enough words
45: * to make the line length as near as possible to the goal
46: * without exceeding the maximum. (If a single word would
47: * exceed the maximum, we output that anyway.) Of course
48: * the trailing whitespace of the last word is ignored.
49: * We then emit a newline and start again if there are any
50: * words left.
51: * Note that for a blank line this translates as "We emit
52: * a newline".
53: * If the `-l <n>' option is given, then leading whitespace
54: * is modified slightly: <n> spaces are replaced by a tab.
55: * Indented paragraphs (see above under `-p') make matters
56: * more complicated than this suggests. Actually every paragraph
57: * has two `leading whitespace' values; the value for the first
58: * line, and the value for the most recent line. (While processing
59: * the first line, the two are equal. When `-p' has not been
60: * given, they are always equal.) The leading whitespace
61: * actually output is that of the first line (for the first
62: * line of *output*) or that of the most recent line (for
63: * all other lines of output).
64: * When `-m' has been given, message header paragraphs are
65: * taken as having first-leading-whitespace empty and
66: * subsequent-leading-whitespace two spaces.
67: *
68: * Multiple input files are formatted one at a time, so that a file
69: * never ends in the middle of a line.
70: *
71: * There's an alternative mode of operation, invoked by giving
72: * the `-c' option. In that case we just center every line,
73: * and most of the other options are ignored. This should
74: * really be in a separate program, but we must stay compatible
75: * with old `fmt'.
76: *
77: * QUERY: Should `-m' also try to do the right thing with quoted text?
78: * QUERY: `-b' to treat backslashed whitespace as old `fmt' does?
79: * QUERY: Option meaning `never join lines'?
80: * QUERY: Option meaning `split in mid-word to avoid overlong lines'?
81: * (Those last two might not be useful, since we have `fold'.)
82: *
83: * Differences from old `fmt':
84: *
85: * - We have many more options. Options that aren't understood
86: * generate a lengthy usage message, rather than being
87: * treated as filenames.
88: * - Even with `-m', our handling of message headers is
89: * significantly different. (And much better.)
90: * - We don't treat `\ ' as non-word-breaking.
91: * - Downward changes of indentation start new paragraphs
92: * for us, as well as upward. (I think old `fmt' behaves
93: * in the way it does in order to allow indented paragraphs,
94: * but this is a broken way of making indented paragraphs
95: * behave right.)
96: * - Given the choice of going over or under |goal_length|
97: * by the same amount, we go over; old `fmt' goes under.
98: * - We treat `?' as ending a sentence, and not `:'. Old `fmt'
99: * does the reverse.
100: * - We return approved return codes. Old `fmt' returns
101: * 1 for some errors, and *the number of unopenable files*
102: * when that was all that went wrong.
103: * - We have fewer crashes and more helpful error messages.
104: * - We don't turn spaces into tabs at starts of lines unless
105: * specifically requested.
106: * - New `fmt' is somewhat smaller and slightly faster than
107: * old `fmt'.
108: *
109: * Bugs:
110: *
111: * None known. There probably are some, though.
112: *
113: * Portability:
114: *
115: * I believe this code to be pretty portable. It does require
116: * that you have `getopt'. If you need to include "getopt.h"
117: * for this (e.g., if your system didn't come with `getopt'
118: * and you installed it yourself) then you should arrange for
119: * NEED_getopt_h to be #defined.
120: *
121: * Everything here should work OK even on nasty 16-bit
122: * machines and nice 64-bit ones. However, it's only really
123: * been tested on my FreeBSD machine. Your mileage may vary.
124: */
125:
126: /* Copyright (c) 1997 Gareth McCaughan. All rights reserved.
127: *
128: * Redistribution and use of this code, in source or binary forms,
129: * with or without modification, are permitted subject to the following
130: * conditions:
131: *
132: * - Redistribution of source code must retain the above copyright
1.1 deraadt 133: * notice, this list of conditions and the following disclaimer.
1.10 millert 134: *
135: * - If you distribute modified source code it must also include
136: * a notice saying that it has been modified, and giving a brief
137: * description of what changes have been made.
138: *
139: * Disclaimer: I am not responsible for the results of using this code.
140: * If it formats your hard disc, sends obscene messages to
141: * your boss and kills your children then that's your problem
142: * not mine. I give absolutely no warranty of any sort as to
143: * what the program will do, and absolutely refuse to be held
144: * liable for any consequences of your using it.
145: * Thank you. Have a nice day.
146: */
147:
148: /* RCS change log:
149: * Revision 1.5 1998/03/02 18:02:21 gjm11
150: * Minor changes for portability.
151: *
152: * Revision 1.4 1997/10/01 11:51:28 gjm11
153: * Repair broken indented-paragraph handling.
154: * Add mail message header stuff.
155: * Improve comments and layout.
156: * Make usable with non-BSD systems.
157: * Add revision display to usage message.
158: *
159: * Revision 1.3 1997/09/30 16:24:47 gjm11
160: * Add copyright notice, rcsid string and log message.
161: *
162: * Revision 1.2 1997/09/30 16:13:39 gjm11
163: * Add options: -d <chars>, -l <width>, -p, -s, -t <width>, -h .
164: * Parse options with `getopt'. Clean up code generally.
165: * Make comments more accurate.
166: *
167: * Revision 1.1 1997/09/30 11:29:57 gjm11
168: * Initial revision
1.1 deraadt 169: */
170:
171: #ifndef lint
1.10 millert 172: static const char rcsid[] =
1.26 ! tedu 173: "$OpenBSD: fmt.c,v 1.25 2006/11/29 21:59:04 jmc Exp $";
1.10 millert 174: static const char copyright[] =
175: "Copyright (c) 1997 Gareth McCaughan. All rights reserved.\n";
1.1 deraadt 176: #endif /* not lint */
177:
1.4 millert 178: #include <ctype.h>
1.18 millert 179: #include <err.h>
180: #include <locale.h>
1.1 deraadt 181: #include <stdio.h>
182: #include <stdlib.h>
183: #include <string.h>
1.18 millert 184: #include <sysexits.h>
185: #include <unistd.h>
1.10 millert 186:
187: /* Something that, we hope, will never be a genuine line length,
188: * indentation etc.
1.1 deraadt 189: */
1.10 millert 190: #define SILLY ((size_t)-1)
1.1 deraadt 191:
1.10 millert 192: /* I used to use |strtoul| for this, but (1) not all systems have it
193: * and (2) it's probably better to use |strtol| to detect negative
194: * numbers better.
195: * If |fussyp==0| then we don't complain about non-numbers
196: * (returning 0 instead), but we do complain about bad numbers.
197: */
1.18 millert 198: static size_t
1.21 tedu 199: get_positive(const char *s, const char *err_mess, int fussyP)
200: {
201: char *t;
202: long result = strtol(s, &t, 0);
203:
204: if (*t) {
205: if (fussyP)
206: goto Lose;
207: else
208: return 0;
209: }
210: if (result <= 0) {
211: Lose:
212: errx(EX_USAGE, "%s", err_mess);
213: }
214:
215: return (size_t) result;
1.1 deraadt 216: }
217:
1.10 millert 218: /* Global variables */
219:
1.21 tedu 220: static int centerP = 0; /* Try to center lines? */
221: static size_t goal_length = 0; /* Target length for output lines */
222: static size_t max_length = 0; /* Maximum length for output lines */
223: static int coalesce_spaces_P = 0; /* Coalesce multiple whitespace -> ' ' ? */
224: static int allow_indented_paragraphs = 0; /* Can first line have diff. ind.? */
225: static int tab_width = 8; /* Number of spaces per tab stop */
226: static size_t output_tab_width = 0; /* Ditto, when squashing leading spaces */
227: static const char *sentence_enders = ".?!"; /* Double-space after these */
228: static int grok_mail_headers = 0; /* treat embedded mail headers magically? */
229: static int format_troff = 0; /* Format troff? */
230:
231: static int n_errors = 0; /* Number of failed files. Return on exit. */
232: static char *output_buffer = NULL; /* Output line will be built here */
233: static size_t x; /* Horizontal position in output line */
234: static size_t x0; /* Ditto, ignoring leading whitespace */
235: static size_t pending_spaces; /* Spaces to add before next word */
236: static int output_in_paragraph = 0; /* Any of current para written out yet? */
1.10 millert 237:
238: /* Prototypes */
239:
1.21 tedu 240: static void process_named_file(const char *);
241: static void process_stream(FILE *, const char *);
242: static size_t indent_length(const char *, size_t);
243: static int might_be_header(const unsigned char *);
244: static void new_paragraph(size_t, size_t);
245: static void output_word(size_t, size_t, const char *, size_t, size_t);
246: static void output_indent(size_t);
247: static void center_stream(FILE *, const char *);
248: static char *get_line(FILE *, size_t *);
249: static void *xrealloc(void *, size_t);
250: void usage(void);
1.10 millert 251:
1.21 tedu 252: #define XMALLOC(x) xrealloc(0, x)
1.10 millert 253:
254: /* Here is perhaps the right place to mention that this code is
255: * all in top-down order. Hence, |main| comes first.
1.1 deraadt 256: */
1.4 millert 257: int
1.21 tedu 258: main(int argc, char *argv[])
259: {
260: int ch; /* used for |getopt| processing */
261:
262: (void)setlocale(LC_CTYPE, "");
263:
264: /* 1. Grok parameters. */
265: while ((ch = getopt(argc, argv, "0123456789cd:hl:mnpst:w:")) != -1) {
266: switch (ch) {
267: case 'c':
268: centerP = 1;
269: break;
270: case 'd':
271: sentence_enders = optarg;
272: break;
273: case 'l':
274: output_tab_width
275: = get_positive(optarg, "output tab width must be positive", 1);
276: break;
277: case 'm':
278: grok_mail_headers = 1;
279: break;
280: case 'n':
281: format_troff = 1;
282: break;
283: case 'p':
284: allow_indented_paragraphs = 1;
285: break;
286: case 's':
287: coalesce_spaces_P = 1;
288: break;
289: case 't':
290: tab_width = get_positive(optarg, "tab width must be positive", 1);
291: break;
292: case 'w':
293: goal_length = get_positive(optarg, "width must be positive", 1);
294: max_length = goal_length;
295: break;
296: case '0': case '1': case '2': case '3': case '4': case '5':
297: case '6': case '7': case '8': case '9':
298: /* XXX this is not a stylistically approved use of getopt() */
299: if (goal_length == 0) {
300: char *p;
301:
302: p = argv[optind - 1];
303: if (p[0] == '-' && p[1] == ch && !p[2])
304: goal_length = get_positive(++p, "width must be nonzero", 1);
305: else
306: goal_length = get_positive(argv[optind]+1,
307: "width must be nonzero", 1);
308: max_length = goal_length;
309: }
310: break;
311: case 'h':
312: default:
313: usage();
314: /* NOT REACHED */
315: }
316: }
317:
318: argc -= optind;
319: argv += optind;
320:
321: /* [ goal [ maximum ] ] */
322: if (argc > 0 && goal_length == 0 &&
323: (goal_length = get_positive(*argv,"goal length must be positive", 0)) != 0) {
324: --argc;
325: ++argv;
326: if (argc > 0 && (max_length = get_positive(*argv,"max length must be positive", 0)) != 0) {
327: --argc;
328: ++argv;
329: if (max_length < goal_length)
330: errx(EX_USAGE, "max length must be >= goal length");
331: }
332: }
333:
334: if (goal_length == 0)
335: goal_length = 65;
336: if (max_length == 0)
337: max_length = goal_length+10;
338: output_buffer = XMALLOC(max_length+1); /* really needn't be longer */
339:
340: /* 2. Process files. */
341:
342: if (argc > 0) {
343: while (argc-- > 0)
344: process_named_file(*argv++);
345: } else {
346: process_stream(stdin, "standard input");
347: }
1.10 millert 348:
1.21 tedu 349: /* We're done. */
350: return n_errors ? EX_NOINPUT : 0;
1.10 millert 351:
352: }
353:
354: /* Process a single file, given its name.
355: */
356: static void
1.21 tedu 357: process_named_file(const char *name)
358: {
359: FILE *f;
360:
361: if ((f = fopen(name, "r")) == NULL) {
1.23 cloder 362: warn("%s", name);
1.21 tedu 363: ++n_errors;
364: } else {
365: process_stream(f, name);
366: fclose(f);
367: }
1.10 millert 368: }
369:
370: /* Types of mail header continuation lines:
371: */
372: typedef enum {
1.21 tedu 373: hdr_ParagraphStart = -1,
374: hdr_NonHeader = 0,
375: hdr_Header = 1,
376: hdr_Continuation = 2
1.10 millert 377: } HdrType;
378:
379: /* Process a stream. This is where the real work happens,
380: * except that centering is handled separately.
381: */
382: static void
1.21 tedu 383: process_stream(FILE *stream, const char *name)
384: {
385: size_t n;
386: size_t np;
387: size_t last_indent = SILLY; /* how many spaces in last indent? */
388: size_t para_line_number = 0; /* how many lines already read in this para? */
389: size_t first_indent = SILLY; /* indentation of line 0 of paragraph */
390: HdrType prev_header_type = hdr_ParagraphStart;
391: HdrType header_type;
392:
1.10 millert 393: /* ^-- header_type of previous line; -1 at para start */
1.21 tedu 394: char *line;
395: size_t length;
1.10 millert 396:
1.21 tedu 397: if (centerP) {
398: center_stream(stream, name);
399: return;
400: }
401:
402: while ((line = get_line(stream, &length)) != NULL) {
403: np = indent_length(line, length);
404: header_type = hdr_NonHeader;
405: if (grok_mail_headers && prev_header_type != hdr_NonHeader) {
406: if (np == 0 && might_be_header(line))
407: header_type = hdr_Header;
408: else if (np > 0 && prev_header_type>hdr_NonHeader)
409: header_type = hdr_Continuation;
410: }
411:
412: /* We need a new paragraph if and only if:
413: * this line is blank,
414: * OR it's a troff request,
415: * OR it's a mail header,
416: * OR it's not a mail header AND the last line was one,
417: * OR the indentation has changed
418: * AND the line isn't a mail header continuation line
419: * AND this isn't the second line of an indented paragraph.
420: */
421: if (length == 0 || (line[0] == '.' && !format_troff) ||
422: header_type == hdr_Header ||
423: (header_type == hdr_NonHeader && prev_header_type > hdr_NonHeader) ||
424: (np != last_indent && header_type != hdr_Continuation &&
425: (!allow_indented_paragraphs || para_line_number != 1)) ) {
426: new_paragraph(output_in_paragraph ? last_indent : first_indent, np);
427: para_line_number = 0;
428: first_indent = np;
429: last_indent = np;
430:
431: /* nroff compatibility */
432: if (length > 0 && line[0] == '.' && !format_troff) {
433: printf("%.*s\n", (int)length, line);
434: continue;
435: }
436: if (header_type == hdr_Header)
437: last_indent = 2; /* for cont. lines */
438: if (length == 0) {
439: putchar('\n');
440: prev_header_type = hdr_ParagraphStart;
441: continue;
442: } else {
443: /* If this is an indented paragraph other than a mail header
444: * continuation, set |last_indent|.
445: */
446: if (np != last_indent && header_type != hdr_Continuation)
447: last_indent = np;
448: }
449: prev_header_type = header_type;
450: }
451:
452: n = np;
453: while (n < length) {
454: /* Find word end and count spaces after it */
455: size_t word_length = 0, space_length = 0;
456: while (n+word_length < length && line[n+word_length] != ' ')
457: ++word_length;
458: space_length = word_length;
459: while (n+space_length < length && line[n+space_length] == ' ')
460: ++space_length;
461: /* Send the word to the output machinery. */
462: output_word(first_indent, last_indent,
463: line+n, word_length, space_length-word_length);
464: n += space_length;
465: }
466: ++para_line_number;
467: }
468:
469: new_paragraph(output_in_paragraph ? last_indent : first_indent, 0);
470: if (ferror(stream)) {
1.23 cloder 471: warn("%s", name);
1.21 tedu 472: ++n_errors;
473: }
1.10 millert 474: }
475:
476: /* How long is the indent on this line?
477: */
478: static size_t
1.21 tedu 479: indent_length(const char *line, size_t length)
480: {
481: size_t n = 0;
482:
483: while (n < length && *line++ == ' ')
484: ++n;
485: return n;
1.10 millert 486: }
487:
488: /* Might this line be a mail header?
489: * We deem a line to be a possible header if it matches the
490: * Perl regexp /^[A-Z][-A-Za-z0-9]*:\s/. This is *not* the same
491: * as in RFC whatever-number-it-is; we want to be gratuitously
492: * conservative to avoid mangling ordinary civilised text.
493: */
494: static int
1.21 tedu 495: might_be_header(const unsigned char *line)
496: {
497:
498: if (!isupper(*line++))
499: return 0;
1.26 ! tedu 500: while (isalnum(*line) || *line == '-')
1.21 tedu 501: ++line;
502: return (*line == ':' && isspace(line[1]));
1.10 millert 503: }
504:
505: /* Begin a new paragraph with an indent of |indent| spaces.
506: */
507: static void
1.21 tedu 508: new_paragraph(size_t old_indent, size_t indent)
509: {
510:
511: if (x0) {
512: if (old_indent > 0)
513: output_indent(old_indent);
514: fwrite(output_buffer, 1, x0, stdout);
515: putchar('\n');
516: }
517: x = indent;
518: x0 = 0;
519: pending_spaces = 0;
520: output_in_paragraph = 0;
1.10 millert 521: }
522:
523: /* Output spaces or tabs for leading indentation.
524: */
525: static void
1.21 tedu 526: output_indent(size_t n_spaces)
527: {
528:
529: if (output_tab_width) {
530: while (n_spaces >= output_tab_width) {
531: putchar('\t');
532: n_spaces -= output_tab_width;
533: }
534: }
535: while (n_spaces-- > 0)
536: putchar(' ');
1.10 millert 537: }
538:
539: /* Output a single word, or add it to the buffer.
540: * indent0 and indent1 are the indents to use on the first and subsequent
541: * lines of a paragraph. They'll often be the same, of course.
542: */
543: static void
1.21 tedu 544: output_word(size_t indent0, size_t indent1, const char *word, size_t length, size_t spaces)
545: {
546: size_t new_x = x + pending_spaces + length;
547: size_t indent = output_in_paragraph ? indent1 : indent0;
548:
549: /* If either |spaces==0| (at end of line) or |coalesce_spaces_P|
550: * (squashing internal whitespace), then add just one space;
551: * except that if the last character was a sentence-ender we
552: * actually add two spaces.
553: */
554: if (coalesce_spaces_P || spaces == 0)
555: spaces = strchr(sentence_enders, word[length-1]) ? 2 : 1;
556:
557: if (new_x <= goal_length) {
558: /* After adding the word we still aren't at the goal length,
559: * so clearly we add it to the buffer rather than outputing it.
560: */
561: memset(output_buffer+x0, ' ', pending_spaces);
562: x0 += pending_spaces;
563: x += pending_spaces;
564: memcpy(output_buffer+x0, word, length);
565: x0 += length;
566: x += length;
567: pending_spaces = spaces;
568: } else {
569: /* Adding the word takes us past the goal. Print the line-so-far,
570: * and the word too iff either (1) the lsf is empty or (2) that
571: * makes us nearer the goal but doesn't take us over the limit,
572: * or (3) the word on its own takes us over the limit.
573: * In case (3) we put a newline in between.
574: */
575: if (indent > 0)
576: output_indent(indent);
577: fwrite(output_buffer, 1, x0, stdout);
578: if (x0 == 0 || (new_x <= max_length && new_x-goal_length <= goal_length-x)) {
579: printf("%*s", (int)pending_spaces, "");
580: goto write_out_word;
581: } else {
582: /* If the word takes us over the limit on its own, just
583: * spit it out and don't bother buffering it.
584: */
585: if (indent+length > max_length) {
586: putchar('\n');
587: if (indent > 0)
588: output_indent(indent);
1.10 millert 589: write_out_word:
1.21 tedu 590: fwrite(word, 1, length, stdout);
591: x0 = 0;
592: x = indent1;
593: pending_spaces = 0;
594: } else {
595: memcpy(output_buffer, word, length);
596: x0 = length;
597: x = length+indent1;
598: pending_spaces = spaces;
599: }
600: }
601:
602: putchar('\n');
603: output_in_paragraph = 1;
604: }
1.10 millert 605: }
606:
607: /* Process a stream, but just center its lines rather than trying to
608: * format them neatly.
609: */
610: static void
1.21 tedu 611: center_stream(FILE *stream, const char *name)
612: {
613: char *line;
614: size_t length;
615: size_t l;
616:
617: while ((line = get_line(stream, &length)) != 0) {
618: l = length;
619: while (l > 0 && isspace(*line)) {
620: ++line;
621: --l;
622: }
623:
624: length = l;
625:
626: while (l < goal_length) {
627: putchar(' ');
628: l += 2;
629: }
630:
631: fwrite(line, 1, length, stdout);
632: putchar('\n');
633: }
634:
635: if (ferror(stream)) {
1.23 cloder 636: warn("%s", name);
1.21 tedu 637: ++n_errors;
638: }
1.10 millert 639: }
640:
641: /* Get a single line from a stream. Expand tabs, strip control
642: * characters and trailing whitespace, and handle backspaces.
643: * Return the address of the buffer containing the line, and
644: * put the length of the line in |lengthp|.
645: * This can cope with arbitrarily long lines, and with lines
646: * without terminating \n.
647: * If there are no characters left or an error happens, we
648: * return 0.
649: * Don't confuse |spaces_pending| here with the global
650: * |pending_spaces|.
651: */
652: static char *
1.21 tedu 653: get_line(FILE *stream, size_t *lengthp)
654: {
655: int ch;
656: int troff = 0;
657: static char *buf = NULL;
658: static size_t length = 0;
659: size_t len = 0;
660: size_t spaces_pending = 0;
661:
662: if (buf == NULL) {
663: length = 100;
664: buf = XMALLOC(length);
665: }
666:
667: while ((ch = getc(stream)) != '\n' && ch != EOF) {
668: if ((len + spaces_pending == 0) && (ch == '.' && !format_troff))
669: troff = 1;
670: if (ch == ' ') {
671: ++spaces_pending;
672: } else if (troff || !iscntrl(ch)) {
673: while (len + spaces_pending >= length) {
674: length *= 2;
675: buf = xrealloc(buf, length);
676: }
677:
678: while (spaces_pending > 0) {
679: --spaces_pending;
680: buf[len++] = ' ';
681: }
682: buf[len++] = ch;
683: } else if (ch == '\t') {
684: spaces_pending += tab_width - (len+spaces_pending)%tab_width;
685: } else if (ch == '\b') {
686: if (len)
687: --len;
688: }
689: }
690:
691: *lengthp = len;
692: return (len > 0 || ch != EOF) ? buf : 0;
1.10 millert 693: }
694:
695: /* (Re)allocate some memory, exiting with an error if we can't.
696: */
697: static void *
1.21 tedu 698: xrealloc(void *ptr, size_t nbytes)
699: {
700: void *p;
701:
702: p = realloc(ptr, nbytes);
703: if (p == NULL)
704: errx(EX_OSERR, "out of memory");
705: return p;
706: }
707:
708: void
709: usage(void)
710: {
1.22 mickey 711: extern char *__progname;
1.21 tedu 712:
713: fprintf(stderr,
1.25 jmc 714: "usage: %s [-cmnps] [-d chars] [-l number] [-t number]\n"
715: "\t[goal [maximum] | -width | -w width] [file ...]\n",
716: __progname);
1.22 mickey 717: exit (1);
1.1 deraadt 718: }
![[BACK]](/icons/back.gif){kind=icon}
Return to fmt.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / fmt