Annotation of src/usr.bin/fmt/fmt.c, Revision 1.7
1.7 ! deraadt 1: /* $OpenBSD: fmt.c,v 1.6 1997/02/08 10:23:39 deraadt Exp $ */
1.1 deraadt 2: /* $NetBSD: fmt.c,v 1.4 1995/09/01 01:29:41 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1980, 1993
6: * The Regents of the University of California. All rights reserved.
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:
37: #ifndef lint
38: static char copyright[] =
39: "@(#) Copyright (c) 1980, 1993\n\
40: The Regents of the University of California. All rights reserved.\n";
41: #endif /* not lint */
42:
43: #ifndef lint
44: #if 0
45: static char sccsid[] = "@(#)fmt.c 8.1 (Berkeley) 7/20/93";
1.4 millert 46: #else
1.7 ! deraadt 47: static char rcsid[] = "$OpenBSD: fmt.c,v 1.6 1997/02/08 10:23:39 deraadt Exp $";
1.1 deraadt 48: #endif
49: #endif /* not lint */
50:
1.4 millert 51: #include <ctype.h>
52: #include <err.h>
53: #include <locale.h>
1.1 deraadt 54: #include <stdio.h>
55: #include <stdlib.h>
56: #include <string.h>
57:
1.5 millert 58: #ifdef __GNUC__
59: #define inline __inline
60: #else /* !__GNUC__ */
61: #define inline
62: #endif /* !__GNUC__ */
63:
1.1 deraadt 64: /*
65: * fmt -- format the concatenation of input files or standard input
66: * onto standard output. Designed for use with Mail ~|
67: *
68: * Syntax : fmt [ goal [ max ] ] [ name ... ]
69: * Authors: Kurt Shoens (UCB) 12/7/78;
70: * Liz Allen (UMCP) 2/24/83 [Addition of goal length concept].
71: */
72:
73: /* LIZ@UOM 6/18/85 -- Don't need LENGTH any more.
74: * #define LENGTH 72 Max line length in output
75: */
76: #define NOSTR ((char *) 0) /* Null string pointer for lint */
77:
78: /* LIZ@UOM 6/18/85 --New variables goal_length and max_length */
79: #define GOAL_LENGTH 65
80: #define MAX_LENGTH 75
81: int goal_length; /* Target or goal line length in output */
82: int max_length; /* Max line length in output */
83: int pfx; /* Current leading blank count */
84: int lineno; /* Current input line */
85: int mark; /* Last place we saw a head line */
1.4 millert 86: int center; /* Did they ask to center lines? */
1.1 deraadt 87:
88: char *headnames[] = {"To", "Subject", "Cc", 0};
89:
1.4 millert 90: void fmt __P((FILE *));
91: void setout __P((void));
92: void prefix __P((char *));
93: void split __P((char *));
94: void pack __P((char *, int));
95: void oflush __P((void));
96: void tabulate __P((char *));
97: void leadin __P((void));
98: char *savestr __P((char *));
1.6 deraadt 99: inline char *extstr __P((char *, int *, int));
1.4 millert 100: int ispref __P((char *, char *));
101: int ishead __P((char *));
102:
1.1 deraadt 103: /*
104: * Drive the whole formatter by managing input files. Also,
105: * cause initialization of the output stuff and flush it out
106: * at the end.
107: */
108:
1.4 millert 109: int
1.1 deraadt 110: main(argc, argv)
111: int argc;
112: char **argv;
113: {
114: register FILE *fi;
115: register int errs = 0;
116: int number; /* LIZ@UOM 6/18/85 */
117:
1.4 millert 118: (void) setlocale(LC_CTYPE, "");
119:
1.1 deraadt 120: goal_length = GOAL_LENGTH;
121: max_length = MAX_LENGTH;
122: setout();
123: lineno = 1;
124: mark = -10;
125: /*
1.4 millert 126: * LIZ@UOM 6/18/85 -- Check for goal and max length arguments
1.1 deraadt 127: */
1.4 millert 128: if (argc > 1 && !strcmp(argv[1], "-c")) {
129: center++;
130: argc--;
131: argv++;
132: }
1.1 deraadt 133: if (argc > 1 && (1 == (sscanf(argv[1], "%d", &number)))) {
134: argv++;
135: argc--;
136: goal_length = number;
137: if (argc > 1 && (1 == (sscanf(argv[1], "%d", &number)))) {
138: argv++;
139: argc--;
140: max_length = number;
141: }
142: }
1.4 millert 143: if (max_length <= goal_length)
144: errx(1, "Max length (%d) must be greater than goal length: %d",
145: max_length, goal_length);
1.1 deraadt 146: if (argc < 2) {
147: fmt(stdin);
148: oflush();
149: exit(0);
150: }
151: while (--argc) {
152: if ((fi = fopen(*++argv, "r")) == NULL) {
153: perror(*argv);
154: errs++;
155: continue;
156: }
157: fmt(fi);
158: fclose(fi);
159: }
160: oflush();
161: exit(errs);
162: }
163:
164: /*
165: * Read up characters from the passed input file, forming lines,
166: * doing ^H processing, expanding tabs, stripping trailing blanks,
167: * and sending each line down for analysis.
168: */
1.4 millert 169: void
1.1 deraadt 170: fmt(fi)
171: FILE *fi;
172: {
1.5 millert 173: static char *linebuf, *canonb;
174: static int lbufsize, cbufsize;
1.4 millert 175: register char *cp, *cp2, cc;
1.1 deraadt 176: register int c, col;
1.4 millert 177: #define CHUNKSIZE 1024
1.7 ! deraadt 178:
! 179: canonb = malloc(CHUNKSIZE);
! 180: if (canonb == 0)
! 181: errx(1, "Ran out of memory");
1.1 deraadt 182:
1.4 millert 183: if (center) {
1.5 millert 184: register int len;
185:
186: linebuf = extstr(linebuf, &lbufsize, NULL);
1.4 millert 187: for (;;) {
1.5 millert 188: len = 0;
189: for (;;) {
190: if (!fgets(linebuf + len, lbufsize - len, fi))
191: break;
192: len = strlen(linebuf);
193: if (linebuf[len-1] == '\n' || feof(fi))
194: break;
195: linebuf = extstr(linebuf, &lbufsize, NULL);
196: }
197: if (len == 0)
1.4 millert 198: return;
1.5 millert 199: cp = linebuf;
1.4 millert 200: while (*cp && isspace(*cp))
201: cp++;
202: cp2 = cp + strlen(cp) - 1;
203: while (cp2 > cp && isspace(*cp2))
204: cp2--;
205: if (cp == cp2)
206: putchar('\n');
207: col = cp2 - cp;
208: for (c = 0; c < (goal_length-col)/2; c++)
209: putchar(' ');
210: while (cp <= cp2)
211: putchar(*cp++);
212: putchar('\n');
213: }
214: }
1.1 deraadt 215: c = getc(fi);
216: while (c != EOF) {
217: /*
218: * Collect a line, doing ^H processing.
219: * Leave tabs for now.
220: */
221: cp = linebuf;
1.4 millert 222: while (c != '\n' && c != EOF) {
223: if (cp - linebuf >= lbufsize) {
224: int offset = cp - linebuf;
1.5 millert 225: linebuf = extstr(linebuf, &lbufsize, NULL);
1.4 millert 226: cp = linebuf + offset;
227: }
1.1 deraadt 228: if (c == '\b') {
229: if (cp > linebuf)
230: cp--;
231: c = getc(fi);
232: continue;
233: }
1.4 millert 234: if (!isprint(c) && c != '\t') {
1.1 deraadt 235: c = getc(fi);
236: continue;
237: }
238: *cp++ = c;
239: c = getc(fi);
240: }
241:
242: /*
243: * Toss anything remaining on the input line.
244: */
245: while (c != '\n' && c != EOF)
246: c = getc(fi);
1.4 millert 247:
248: if (cp != NULL) {
249: *cp = '\0';
250: } else {
251: putchar('\n');
252: c = getc(fi);
253: continue;
254: }
255:
1.1 deraadt 256: /*
257: * Expand tabs on the way to canonb.
258: */
259: col = 0;
260: cp = linebuf;
261: cp2 = canonb;
1.4 millert 262: while ((cc = *cp++)) {
263: if (cc != '\t') {
1.1 deraadt 264: col++;
1.4 millert 265: if (cp2 - canonb >= cbufsize) {
266: int offset = cp2 - canonb;
1.5 millert 267: canonb = extstr(canonb, &cbufsize, NULL);
1.4 millert 268: cp2 = canonb + offset;
269: }
270: *cp2++ = cc;
1.1 deraadt 271: continue;
272: }
273: do {
1.4 millert 274: if (cp2 - canonb >= cbufsize) {
275: int offset = cp2 - canonb;
1.5 millert 276: canonb = extstr(canonb, &cbufsize, NULL);
1.4 millert 277: cp2 = canonb + offset;
278: }
279: *cp2++ = ' ';
1.1 deraadt 280: col++;
281: } while ((col & 07) != 0);
282: }
283:
284: /*
285: * Swipe trailing blanks from the line.
286: */
287: for (cp2--; cp2 >= canonb && *cp2 == ' '; cp2--)
288: ;
289: *++cp2 = '\0';
290: prefix(canonb);
291: if (c != EOF)
292: c = getc(fi);
293: }
294: }
295:
296: /*
297: * Take a line devoid of tabs and other garbage and determine its
298: * blank prefix. If the indent changes, call for a linebreak.
299: * If the input line is blank, echo the blank line on the output.
300: * Finally, if the line minus the prefix is a mail header, try to keep
301: * it on a line by itself.
302: */
1.4 millert 303: void
1.1 deraadt 304: prefix(line)
305: char line[];
306: {
307: register char *cp, **hp;
308: register int np, h;
309:
1.4 millert 310: if (*line == '\0') {
1.1 deraadt 311: oflush();
312: putchar('\n');
313: return;
314: }
315: for (cp = line; *cp == ' '; cp++)
316: ;
317: np = cp - line;
318:
319: /*
320: * The following horrible expression attempts to avoid linebreaks
321: * when the indent changes due to a paragraph.
322: */
323: if (np != pfx && (np > pfx || abs(pfx-np) > 8))
324: oflush();
1.4 millert 325: if ((h = ishead(cp)))
1.1 deraadt 326: oflush(), mark = lineno;
327: if (lineno - mark < 3 && lineno - mark > 0)
1.5 millert 328: for (hp = &headnames[0]; *hp != NULL; hp++)
1.1 deraadt 329: if (ispref(*hp, cp)) {
330: h = 1;
331: oflush();
332: break;
333: }
334: if (!h && (h = (*cp == '.')))
335: oflush();
336: pfx = np;
337: if (h)
338: pack(cp, strlen(cp));
1.5 millert 339: else
340: split(cp);
1.1 deraadt 341: if (h)
342: oflush();
343: lineno++;
344: }
345:
346: /*
347: * Split up the passed line into output "words" which are
348: * maximal strings of non-blanks with the blank separation
349: * attached at the end. Pass these words along to the output
350: * line packer.
351: */
1.4 millert 352: void
1.1 deraadt 353: split(line)
354: char line[];
355: {
356: register char *cp, *cp2;
1.5 millert 357: static char *word;
358: static int wordsize;
1.1 deraadt 359: int wordl; /* LIZ@UOM 6/18/85 */
360:
1.5 millert 361: if (strlen(line) >= wordsize)
362: word = extstr(word, &wordsize, strlen(line) + 1);
363:
1.1 deraadt 364: cp = line;
365: while (*cp) {
366: cp2 = word;
367: wordl = 0; /* LIZ@UOM 6/18/85 */
368:
369: /*
370: * Collect a 'word,' allowing it to contain escaped white
1.4 millert 371: * space.
1.1 deraadt 372: */
373: while (*cp && *cp != ' ') {
374: if (*cp == '\\' && isspace(cp[1]))
375: *cp2++ = *cp++;
376: *cp2++ = *cp++;
377: wordl++;/* LIZ@UOM 6/18/85 */
378: }
379:
380: /*
381: * Guarantee a space at end of line. Two spaces after end of
1.4 millert 382: * sentence punctuation.
1.1 deraadt 383: */
384: if (*cp == '\0') {
385: *cp2++ = ' ';
1.3 millert 386: if (strchr(".:!", cp[-1]))
1.1 deraadt 387: *cp2++ = ' ';
388: }
389: while (*cp == ' ')
390: *cp2++ = *cp++;
391: *cp2 = '\0';
392: /*
1.4 millert 393: * LIZ@UOM 6/18/85 pack(word);
1.1 deraadt 394: */
395: pack(word, wordl);
396: }
397: }
398:
399: /*
400: * Output section.
401: * Build up line images from the words passed in. Prefix
402: * each line with correct number of blanks. The buffer "outbuf"
403: * contains the current partial line image, including prefixed blanks.
404: * "outp" points to the next available space therein. When outp is NOSTR,
405: * there ain't nothing in there yet. At the bottom of this whole mess,
406: * leading tabs are reinserted.
407: */
1.5 millert 408: static char *outbuf; /* Sandbagged output line image */
409: static int obufsize; /* Size of outbuf */
410: static char *outp; /* Pointer in above */
1.1 deraadt 411:
412: /*
413: * Initialize the output section.
414: */
1.4 millert 415: void
1.1 deraadt 416: setout()
417: {
418: outp = NOSTR;
419: }
420:
421: /*
422: * Pack a word onto the output line. If this is the beginning of
423: * the line, push on the appropriately-sized string of blanks first.
424: * If the word won't fit on the current line, flush and begin a new
425: * line. If the word is too long to fit all by itself on a line,
426: * just give it its own and hope for the best.
427: *
428: * LIZ@UOM 6/18/85 -- If the new word will fit in at less than the
429: * goal length, take it. If not, then check to see if the line
430: * will be over the max length; if so put the word on the next
431: * line. If not, check to see if the line will be closer to the
432: * goal length with or without the word and take it or put it on
433: * the next line accordingly.
434: */
435:
436: /*
437: * LIZ@UOM 6/18/85 -- pass in the length of the word as well
438: * pack(word)
439: * char word[];
440: */
1.4 millert 441: void
442: pack(word, wl)
1.1 deraadt 443: char word[];
444: int wl;
445: {
446: register char *cp;
447: register int s, t;
448:
449: if (outp == NOSTR)
450: leadin();
451: /*
452: * LIZ@UOM 6/18/85 -- change condition to check goal_length; s is the
453: * length of the line before the word is added; t is now the length
454: * of the line after the word is added
455: * t = strlen(word);
1.4 millert 456: * if (t+s <= LENGTH)
1.1 deraadt 457: */
458: s = outp - outbuf;
459: t = wl + s;
1.5 millert 460: if (t + 1 > obufsize) {
461: outbuf = extstr(outbuf, &obufsize, t + 1);
462: outp = outbuf + s;
463: }
1.1 deraadt 464: if ((t <= goal_length) ||
465: ((t <= max_length) && (t - goal_length <= goal_length - s))) {
466: /*
1.4 millert 467: * In like flint!
1.1 deraadt 468: */
1.5 millert 469: for (cp = word; *cp; *outp++ = *cp++)
470: ;
1.1 deraadt 471: return;
472: }
473: if (s > pfx) {
474: oflush();
475: leadin();
476: }
1.5 millert 477: for (cp = word; *cp; *outp++ = *cp++)
478: ;
1.1 deraadt 479: }
480:
481: /*
482: * If there is anything on the current output line, send it on
483: * its way. Set outp to NOSTR to indicate the absence of the current
484: * line prefix.
485: */
1.4 millert 486: void
1.1 deraadt 487: oflush()
488: {
489: if (outp == NOSTR)
490: return;
491: *outp = '\0';
492: tabulate(outbuf);
493: outp = NOSTR;
494: }
495:
496: /*
497: * Take the passed line buffer, insert leading tabs where possible, and
498: * output on standard output (finally).
499: */
1.4 millert 500: void
1.1 deraadt 501: tabulate(line)
502: char line[];
503: {
504: register char *cp;
505: register int b, t;
506:
507: /*
508: * Toss trailing blanks in the output line.
509: */
510: cp = line + strlen(line) - 1;
511: while (cp >= line && *cp == ' ')
512: cp--;
513: *++cp = '\0';
1.4 millert 514:
1.1 deraadt 515: /*
516: * Count the leading blank space and tabulate.
517: */
518: for (cp = line; *cp == ' '; cp++)
519: ;
520: b = cp-line;
521: t = b >> 3;
522: b &= 07;
523: if (t > 0)
524: do
525: putc('\t', stdout);
526: while (--t);
527: if (b > 0)
528: do
529: putc(' ', stdout);
530: while (--b);
531: while (*cp)
532: putc(*cp++, stdout);
533: putc('\n', stdout);
534: }
535:
536: /*
537: * Initialize the output line with the appropriate number of
538: * leading blanks.
539: */
1.4 millert 540: void
1.1 deraadt 541: leadin()
542: {
543: register int b;
544: register char *cp;
545:
1.5 millert 546: if (obufsize == 0 || (outp != NULL && outp - outbuf <= pfx))
547: outbuf = extstr(outbuf, &obufsize, pfx);
1.1 deraadt 548: for (b = 0, cp = outbuf; b < pfx; b++)
549: *cp++ = ' ';
550: outp = cp;
551: }
552:
553: /*
554: * Save a string in dynamic space.
555: * This little goodie is needed for
556: * a headline detector in head.c
557: */
558: char *
559: savestr(str)
560: char str[];
561: {
1.4 millert 562: char *top;
1.1 deraadt 563:
1.4 millert 564: top = strdup(str);
565: if (top == NOSTR)
566: errx(1, "Ran out of memory");
1.1 deraadt 567: return (top);
568: }
569:
570: /*
571: * Is s1 a prefix of s2??
572: */
1.4 millert 573: int
1.1 deraadt 574: ispref(s1, s2)
575: register char *s1, *s2;
576: {
577:
578: while (*s1++ == *s2)
579: ;
580: return (*s1 == '\0');
1.5 millert 581: }
582:
583: inline char *
584: extstr(str, size, gsize)
585: char *str;
586: int *size;
587: int gsize;
588: {
589: do {
590: *size += CHUNKSIZE;
591: } while (gsize && *size < gsize);
592:
593: if ((str = realloc(str, *size)) == NULL)
594: errx(1, "Ran out of memory");
595:
596: return(str);
1.1 deraadt 597: }
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