Annotation of src/usr.bin/fmt/fmt.c, Revision 1.29
1.29 ! lum 1: /* $OpenBSD: fmt.c,v 1.28 2012/01/15 11:43:45 schwarze 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:
1.4 millert 171: #include <ctype.h>
1.18 millert 172: #include <err.h>
173: #include <locale.h>
1.1 deraadt 174: #include <stdio.h>
175: #include <stdlib.h>
176: #include <string.h>
1.18 millert 177: #include <sysexits.h>
178: #include <unistd.h>
1.10 millert 179:
180: /* Something that, we hope, will never be a genuine line length,
181: * indentation etc.
1.1 deraadt 182: */
1.10 millert 183: #define SILLY ((size_t)-1)
1.1 deraadt 184:
1.10 millert 185: /* I used to use |strtoul| for this, but (1) not all systems have it
186: * and (2) it's probably better to use |strtol| to detect negative
187: * numbers better.
188: * If |fussyp==0| then we don't complain about non-numbers
189: * (returning 0 instead), but we do complain about bad numbers.
190: */
1.18 millert 191: static size_t
1.21 tedu 192: get_positive(const char *s, const char *err_mess, int fussyP)
193: {
194: char *t;
195: long result = strtol(s, &t, 0);
196:
197: if (*t) {
198: if (fussyP)
199: goto Lose;
200: else
201: return 0;
202: }
203: if (result <= 0) {
204: Lose:
205: errx(EX_USAGE, "%s", err_mess);
206: }
207:
208: return (size_t) result;
1.1 deraadt 209: }
210:
1.10 millert 211: /* Global variables */
212:
1.21 tedu 213: static int centerP = 0; /* Try to center lines? */
214: static size_t goal_length = 0; /* Target length for output lines */
215: static size_t max_length = 0; /* Maximum length for output lines */
216: static int coalesce_spaces_P = 0; /* Coalesce multiple whitespace -> ' ' ? */
217: static int allow_indented_paragraphs = 0; /* Can first line have diff. ind.? */
218: static int tab_width = 8; /* Number of spaces per tab stop */
219: static size_t output_tab_width = 0; /* Ditto, when squashing leading spaces */
220: static const char *sentence_enders = ".?!"; /* Double-space after these */
221: static int grok_mail_headers = 0; /* treat embedded mail headers magically? */
222: static int format_troff = 0; /* Format troff? */
223:
1.28 schwarze 224: static int n_errors = 0; /* Number of failed files. */
1.21 tedu 225: static char *output_buffer = NULL; /* Output line will be built here */
226: static size_t x; /* Horizontal position in output line */
227: static size_t x0; /* Ditto, ignoring leading whitespace */
228: static size_t pending_spaces; /* Spaces to add before next word */
229: static int output_in_paragraph = 0; /* Any of current para written out yet? */
1.10 millert 230:
231: /* Prototypes */
232:
1.21 tedu 233: static void process_named_file(const char *);
234: static void process_stream(FILE *, const char *);
235: static size_t indent_length(const char *, size_t);
236: static int might_be_header(const unsigned char *);
237: static void new_paragraph(size_t, size_t);
238: static void output_word(size_t, size_t, const char *, size_t, size_t);
239: static void output_indent(size_t);
240: static void center_stream(FILE *, const char *);
241: static char *get_line(FILE *, size_t *);
242: static void *xrealloc(void *, size_t);
243: void usage(void);
1.10 millert 244:
1.21 tedu 245: #define XMALLOC(x) xrealloc(0, x)
1.29 ! lum 246: #define ERRS(x) (x >= 127 ? 127 : ++x)
1.10 millert 247:
248: /* Here is perhaps the right place to mention that this code is
249: * all in top-down order. Hence, |main| comes first.
1.1 deraadt 250: */
1.4 millert 251: int
1.21 tedu 252: main(int argc, char *argv[])
253: {
254: int ch; /* used for |getopt| processing */
255:
256: (void)setlocale(LC_CTYPE, "");
257:
258: /* 1. Grok parameters. */
259: while ((ch = getopt(argc, argv, "0123456789cd:hl:mnpst:w:")) != -1) {
260: switch (ch) {
261: case 'c':
262: centerP = 1;
263: break;
264: case 'd':
265: sentence_enders = optarg;
266: break;
267: case 'l':
268: output_tab_width
269: = get_positive(optarg, "output tab width must be positive", 1);
270: break;
271: case 'm':
272: grok_mail_headers = 1;
273: break;
274: case 'n':
275: format_troff = 1;
276: break;
277: case 'p':
278: allow_indented_paragraphs = 1;
279: break;
280: case 's':
281: coalesce_spaces_P = 1;
282: break;
283: case 't':
284: tab_width = get_positive(optarg, "tab width must be positive", 1);
285: break;
286: case 'w':
287: goal_length = get_positive(optarg, "width must be positive", 1);
288: max_length = goal_length;
289: break;
290: case '0': case '1': case '2': case '3': case '4': case '5':
291: case '6': case '7': case '8': case '9':
292: /* XXX this is not a stylistically approved use of getopt() */
293: if (goal_length == 0) {
294: char *p;
295:
296: p = argv[optind - 1];
297: if (p[0] == '-' && p[1] == ch && !p[2])
298: goal_length = get_positive(++p, "width must be nonzero", 1);
299: else
300: goal_length = get_positive(argv[optind]+1,
301: "width must be nonzero", 1);
302: max_length = goal_length;
303: }
304: break;
305: case 'h':
306: default:
307: usage();
308: /* NOT REACHED */
309: }
310: }
311:
312: argc -= optind;
313: argv += optind;
314:
315: /* [ goal [ maximum ] ] */
316: if (argc > 0 && goal_length == 0 &&
317: (goal_length = get_positive(*argv,"goal length must be positive", 0)) != 0) {
318: --argc;
319: ++argv;
320: if (argc > 0 && (max_length = get_positive(*argv,"max length must be positive", 0)) != 0) {
321: --argc;
322: ++argv;
323: if (max_length < goal_length)
324: errx(EX_USAGE, "max length must be >= goal length");
325: }
326: }
327:
328: if (goal_length == 0)
329: goal_length = 65;
330: if (max_length == 0)
331: max_length = goal_length+10;
332: output_buffer = XMALLOC(max_length+1); /* really needn't be longer */
333:
334: /* 2. Process files. */
335:
336: if (argc > 0) {
337: while (argc-- > 0)
338: process_named_file(*argv++);
339: } else {
340: process_stream(stdin, "standard input");
341: }
1.10 millert 342:
1.21 tedu 343: /* We're done. */
1.29 ! lum 344: return n_errors;
1.10 millert 345:
346: }
347:
348: /* Process a single file, given its name.
349: */
350: static void
1.21 tedu 351: process_named_file(const char *name)
352: {
353: FILE *f;
354:
355: if ((f = fopen(name, "r")) == NULL) {
1.23 cloder 356: warn("%s", name);
1.29 ! lum 357: ERRS(n_errors);
1.21 tedu 358: } else {
359: process_stream(f, name);
360: fclose(f);
361: }
1.10 millert 362: }
363:
364: /* Types of mail header continuation lines:
365: */
366: typedef enum {
1.21 tedu 367: hdr_ParagraphStart = -1,
368: hdr_NonHeader = 0,
369: hdr_Header = 1,
370: hdr_Continuation = 2
1.10 millert 371: } HdrType;
372:
373: /* Process a stream. This is where the real work happens,
374: * except that centering is handled separately.
375: */
376: static void
1.21 tedu 377: process_stream(FILE *stream, const char *name)
378: {
379: size_t n;
380: size_t np;
381: size_t last_indent = SILLY; /* how many spaces in last indent? */
382: size_t para_line_number = 0; /* how many lines already read in this para? */
383: size_t first_indent = SILLY; /* indentation of line 0 of paragraph */
384: HdrType prev_header_type = hdr_ParagraphStart;
385: HdrType header_type;
386:
1.10 millert 387: /* ^-- header_type of previous line; -1 at para start */
1.21 tedu 388: char *line;
389: size_t length;
1.10 millert 390:
1.21 tedu 391: if (centerP) {
392: center_stream(stream, name);
393: return;
394: }
395:
396: while ((line = get_line(stream, &length)) != NULL) {
397: np = indent_length(line, length);
398: header_type = hdr_NonHeader;
399: if (grok_mail_headers && prev_header_type != hdr_NonHeader) {
400: if (np == 0 && might_be_header(line))
401: header_type = hdr_Header;
402: else if (np > 0 && prev_header_type>hdr_NonHeader)
403: header_type = hdr_Continuation;
404: }
405:
406: /* We need a new paragraph if and only if:
407: * this line is blank,
408: * OR it's a troff request,
409: * OR it's a mail header,
410: * OR it's not a mail header AND the last line was one,
411: * OR the indentation has changed
412: * AND the line isn't a mail header continuation line
413: * AND this isn't the second line of an indented paragraph.
414: */
415: if (length == 0 || (line[0] == '.' && !format_troff) ||
416: header_type == hdr_Header ||
417: (header_type == hdr_NonHeader && prev_header_type > hdr_NonHeader) ||
418: (np != last_indent && header_type != hdr_Continuation &&
419: (!allow_indented_paragraphs || para_line_number != 1)) ) {
420: new_paragraph(output_in_paragraph ? last_indent : first_indent, np);
421: para_line_number = 0;
422: first_indent = np;
423: last_indent = np;
424:
425: /* nroff compatibility */
426: if (length > 0 && line[0] == '.' && !format_troff) {
427: printf("%.*s\n", (int)length, line);
428: continue;
429: }
430: if (header_type == hdr_Header)
431: last_indent = 2; /* for cont. lines */
432: if (length == 0) {
433: putchar('\n');
434: prev_header_type = hdr_ParagraphStart;
435: continue;
436: } else {
437: /* If this is an indented paragraph other than a mail header
438: * continuation, set |last_indent|.
439: */
440: if (np != last_indent && header_type != hdr_Continuation)
441: last_indent = np;
442: }
443: prev_header_type = header_type;
444: }
445:
446: n = np;
447: while (n < length) {
448: /* Find word end and count spaces after it */
449: size_t word_length = 0, space_length = 0;
450: while (n+word_length < length && line[n+word_length] != ' ')
451: ++word_length;
452: space_length = word_length;
453: while (n+space_length < length && line[n+space_length] == ' ')
454: ++space_length;
455: /* Send the word to the output machinery. */
456: output_word(first_indent, last_indent,
457: line+n, word_length, space_length-word_length);
458: n += space_length;
459: }
460: ++para_line_number;
461: }
462:
463: new_paragraph(output_in_paragraph ? last_indent : first_indent, 0);
464: if (ferror(stream)) {
1.23 cloder 465: warn("%s", name);
1.29 ! lum 466: ERRS(n_errors);
1.21 tedu 467: }
1.10 millert 468: }
469:
470: /* How long is the indent on this line?
471: */
472: static size_t
1.21 tedu 473: indent_length(const char *line, size_t length)
474: {
475: size_t n = 0;
476:
477: while (n < length && *line++ == ' ')
478: ++n;
479: return n;
1.10 millert 480: }
481:
482: /* Might this line be a mail header?
483: * We deem a line to be a possible header if it matches the
484: * Perl regexp /^[A-Z][-A-Za-z0-9]*:\s/. This is *not* the same
485: * as in RFC whatever-number-it-is; we want to be gratuitously
486: * conservative to avoid mangling ordinary civilised text.
487: */
488: static int
1.21 tedu 489: might_be_header(const unsigned char *line)
490: {
491:
492: if (!isupper(*line++))
493: return 0;
1.26 tedu 494: while (isalnum(*line) || *line == '-')
1.21 tedu 495: ++line;
496: return (*line == ':' && isspace(line[1]));
1.10 millert 497: }
498:
499: /* Begin a new paragraph with an indent of |indent| spaces.
500: */
501: static void
1.21 tedu 502: new_paragraph(size_t old_indent, size_t indent)
503: {
504:
505: if (x0) {
506: if (old_indent > 0)
507: output_indent(old_indent);
508: fwrite(output_buffer, 1, x0, stdout);
509: putchar('\n');
510: }
511: x = indent;
512: x0 = 0;
513: pending_spaces = 0;
514: output_in_paragraph = 0;
1.10 millert 515: }
516:
517: /* Output spaces or tabs for leading indentation.
518: */
519: static void
1.21 tedu 520: output_indent(size_t n_spaces)
521: {
522:
523: if (output_tab_width) {
524: while (n_spaces >= output_tab_width) {
525: putchar('\t');
526: n_spaces -= output_tab_width;
527: }
528: }
529: while (n_spaces-- > 0)
530: putchar(' ');
1.10 millert 531: }
532:
533: /* Output a single word, or add it to the buffer.
534: * indent0 and indent1 are the indents to use on the first and subsequent
535: * lines of a paragraph. They'll often be the same, of course.
536: */
537: static void
1.21 tedu 538: output_word(size_t indent0, size_t indent1, const char *word, size_t length, size_t spaces)
539: {
540: size_t new_x = x + pending_spaces + length;
541: size_t indent = output_in_paragraph ? indent1 : indent0;
542:
543: /* If either |spaces==0| (at end of line) or |coalesce_spaces_P|
544: * (squashing internal whitespace), then add just one space;
545: * except that if the last character was a sentence-ender we
546: * actually add two spaces.
547: */
548: if (coalesce_spaces_P || spaces == 0)
549: spaces = strchr(sentence_enders, word[length-1]) ? 2 : 1;
550:
551: if (new_x <= goal_length) {
552: /* After adding the word we still aren't at the goal length,
553: * so clearly we add it to the buffer rather than outputing it.
554: */
555: memset(output_buffer+x0, ' ', pending_spaces);
556: x0 += pending_spaces;
557: x += pending_spaces;
558: memcpy(output_buffer+x0, word, length);
559: x0 += length;
560: x += length;
561: pending_spaces = spaces;
562: } else {
563: /* Adding the word takes us past the goal. Print the line-so-far,
564: * and the word too iff either (1) the lsf is empty or (2) that
565: * makes us nearer the goal but doesn't take us over the limit,
566: * or (3) the word on its own takes us over the limit.
567: * In case (3) we put a newline in between.
568: */
569: if (indent > 0)
570: output_indent(indent);
571: fwrite(output_buffer, 1, x0, stdout);
572: if (x0 == 0 || (new_x <= max_length && new_x-goal_length <= goal_length-x)) {
573: printf("%*s", (int)pending_spaces, "");
574: goto write_out_word;
575: } else {
576: /* If the word takes us over the limit on its own, just
577: * spit it out and don't bother buffering it.
578: */
579: if (indent+length > max_length) {
580: putchar('\n');
581: if (indent > 0)
582: output_indent(indent);
1.10 millert 583: write_out_word:
1.21 tedu 584: fwrite(word, 1, length, stdout);
585: x0 = 0;
586: x = indent1;
587: pending_spaces = 0;
588: } else {
589: memcpy(output_buffer, word, length);
590: x0 = length;
591: x = length+indent1;
592: pending_spaces = spaces;
593: }
594: }
595:
596: putchar('\n');
597: output_in_paragraph = 1;
598: }
1.10 millert 599: }
600:
601: /* Process a stream, but just center its lines rather than trying to
602: * format them neatly.
603: */
604: static void
1.21 tedu 605: center_stream(FILE *stream, const char *name)
606: {
607: char *line;
608: size_t length;
609: size_t l;
610:
611: while ((line = get_line(stream, &length)) != 0) {
612: l = length;
613: while (l > 0 && isspace(*line)) {
614: ++line;
615: --l;
616: }
617:
618: length = l;
619:
620: while (l < goal_length) {
621: putchar(' ');
622: l += 2;
623: }
624:
625: fwrite(line, 1, length, stdout);
626: putchar('\n');
627: }
628:
629: if (ferror(stream)) {
1.23 cloder 630: warn("%s", name);
1.29 ! lum 631: ERRS(n_errors);
1.21 tedu 632: }
1.10 millert 633: }
634:
635: /* Get a single line from a stream. Expand tabs, strip control
636: * characters and trailing whitespace, and handle backspaces.
637: * Return the address of the buffer containing the line, and
638: * put the length of the line in |lengthp|.
639: * This can cope with arbitrarily long lines, and with lines
640: * without terminating \n.
641: * If there are no characters left or an error happens, we
642: * return 0.
643: * Don't confuse |spaces_pending| here with the global
644: * |pending_spaces|.
645: */
646: static char *
1.21 tedu 647: get_line(FILE *stream, size_t *lengthp)
648: {
649: int ch;
650: int troff = 0;
651: static char *buf = NULL;
652: static size_t length = 0;
653: size_t len = 0;
654: size_t spaces_pending = 0;
655:
656: if (buf == NULL) {
657: length = 100;
658: buf = XMALLOC(length);
659: }
660:
661: while ((ch = getc(stream)) != '\n' && ch != EOF) {
662: if ((len + spaces_pending == 0) && (ch == '.' && !format_troff))
663: troff = 1;
664: if (ch == ' ') {
665: ++spaces_pending;
666: } else if (troff || !iscntrl(ch)) {
667: while (len + spaces_pending >= length) {
668: length *= 2;
669: buf = xrealloc(buf, length);
670: }
671:
672: while (spaces_pending > 0) {
673: --spaces_pending;
674: buf[len++] = ' ';
675: }
676: buf[len++] = ch;
677: } else if (ch == '\t') {
678: spaces_pending += tab_width - (len+spaces_pending)%tab_width;
679: } else if (ch == '\b') {
680: if (len)
681: --len;
682: }
683: }
684:
685: *lengthp = len;
686: return (len > 0 || ch != EOF) ? buf : 0;
1.10 millert 687: }
688:
689: /* (Re)allocate some memory, exiting with an error if we can't.
690: */
691: static void *
1.21 tedu 692: xrealloc(void *ptr, size_t nbytes)
693: {
694: void *p;
695:
696: p = realloc(ptr, nbytes);
697: if (p == NULL)
698: errx(EX_OSERR, "out of memory");
699: return p;
700: }
701:
702: void
703: usage(void)
704: {
1.22 mickey 705: extern char *__progname;
1.21 tedu 706:
707: fprintf(stderr,
1.25 jmc 708: "usage: %s [-cmnps] [-d chars] [-l number] [-t number]\n"
709: "\t[goal [maximum] | -width | -w width] [file ...]\n",
710: __progname);
1.22 mickey 711: exit (1);
1.1 deraadt 712: }
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