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9552e6b8 DF |
1 | /* |
2 | * Copyright (c) 1980 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
6 | ||
7 | #ifndef lint | |
2fd8b883 | 8 | char *copyright = |
9552e6b8 DF |
9 | "@(#) Copyright (c) 1980 Regents of the University of California.\n\ |
10 | All rights reserved.\n"; | |
11 | #endif not lint | |
12 | ||
2ae9f53f | 13 | #ifndef lint |
2fd8b883 | 14 | static char *sccsid = "@(#)fmt.c 5.2 (Berkeley) %G%"; |
9552e6b8 | 15 | #endif not lint |
79e55e87 KS |
16 | |
17 | #include <stdio.h> | |
18 | #include <ctype.h> | |
19 | ||
20 | /* | |
21 | * fmt -- format the concatenation of input files or standard input | |
22 | * onto standard output. Designed for use with Mail ~| | |
23 | * | |
ff6a2eb1 | 24 | * Syntax: fmt [ -width ] [ name ... ] |
79e55e87 KS |
25 | * Author: Kurt Shoens (UCB) 12/7/78 |
26 | */ | |
27 | ||
79e55e87 KS |
28 | #define NOSTR ((char *) 0) /* Null string pointer for lint */ |
29 | ||
30 | int pfx; /* Current leading blank count */ | |
31 | int lineno; /* Current input line */ | |
32 | int mark; /* Last place we saw a head line */ | |
ff6a2eb1 | 33 | int width = 72; /* Width that we will not exceed */ |
79e55e87 KS |
34 | |
35 | char *calloc(); /* for lint . . . */ | |
36 | char *headnames[] = {"To", "Subject", "Cc", 0}; | |
37 | ||
38 | /* | |
39 | * Drive the whole formatter by managing input files. Also, | |
40 | * cause initialization of the output stuff and flush it out | |
41 | * at the end. | |
42 | */ | |
43 | ||
44 | main(argc, argv) | |
45 | char **argv; | |
46 | { | |
47 | register FILE *fi; | |
48 | register int errs = 0; | |
ff6a2eb1 KS |
49 | register char *cp; |
50 | int nofile; | |
79e55e87 KS |
51 | |
52 | setout(); | |
53 | lineno = 1; | |
54 | mark = -10; | |
79e55e87 | 55 | if (argc < 2) { |
ff6a2eb1 | 56 | single: |
79e55e87 KS |
57 | fmt(stdin); |
58 | oflush(); | |
59 | exit(0); | |
60 | } | |
ff6a2eb1 | 61 | nofile = 1; |
79e55e87 | 62 | while (--argc) { |
ff6a2eb1 KS |
63 | cp = *++argv; |
64 | if (*cp == '-') { | |
65 | width = atoi(cp+1); | |
66 | if (width <= 0 || width >= BUFSIZ-2) { | |
67 | fprintf(stderr, "fmt: bad width: %d\n", width); | |
68 | exit(1); | |
69 | } | |
70 | continue; | |
71 | } | |
72 | nofile = 0; | |
73 | if ((fi = fopen(cp, "r")) == NULL) { | |
74 | perror(cp); | |
79e55e87 KS |
75 | errs++; |
76 | continue; | |
77 | } | |
78 | fmt(fi); | |
79 | fclose(fi); | |
80 | } | |
ff6a2eb1 KS |
81 | if (nofile) |
82 | goto single; | |
79e55e87 KS |
83 | oflush(); |
84 | exit(errs); | |
85 | } | |
86 | ||
87 | /* | |
88 | * Read up characters from the passed input file, forming lines, | |
89 | * doing ^H processing, expanding tabs, stripping trailing blanks, | |
90 | * and sending each line down for analysis. | |
91 | */ | |
92 | ||
93 | fmt(fi) | |
94 | FILE *fi; | |
95 | { | |
96 | char linebuf[BUFSIZ], canonb[BUFSIZ]; | |
97 | register char *cp, *cp2; | |
98 | register int c, col; | |
99 | ||
100 | c = getc(fi); | |
101 | while (c != EOF) { | |
102 | ||
103 | /* | |
104 | * Collect a line, doing ^H processing. | |
105 | * Leave tabs for now. | |
106 | */ | |
107 | ||
108 | cp = linebuf; | |
109 | while (c != '\n' && c != EOF && cp-linebuf < BUFSIZ-1) { | |
110 | if (c == '\b') { | |
111 | if (cp > linebuf) | |
112 | cp--; | |
113 | c = getc(fi); | |
114 | continue; | |
115 | } | |
116 | if ((c < ' ' || c >= 0177) && c != '\t') { | |
117 | c = getc(fi); | |
118 | continue; | |
119 | } | |
120 | *cp++ = c; | |
121 | c = getc(fi); | |
122 | } | |
123 | *cp = '\0'; | |
124 | ||
125 | /* | |
126 | * Toss anything remaining on the input line. | |
127 | */ | |
128 | ||
129 | while (c != '\n' && c != EOF) | |
130 | c = getc(fi); | |
131 | ||
132 | /* | |
133 | * Expand tabs on the way to canonb. | |
134 | */ | |
135 | ||
136 | col = 0; | |
137 | cp = linebuf; | |
138 | cp2 = canonb; | |
139 | while (c = *cp++) { | |
140 | if (c != '\t') { | |
141 | col++; | |
142 | if (cp2-canonb < BUFSIZ-1) | |
143 | *cp2++ = c; | |
144 | continue; | |
145 | } | |
146 | do { | |
147 | if (cp2-canonb < BUFSIZ-1) | |
148 | *cp2++ = ' '; | |
149 | col++; | |
150 | } while ((col & 07) != 0); | |
151 | } | |
152 | ||
153 | /* | |
154 | * Swipe trailing blanks from the line. | |
155 | */ | |
156 | ||
157 | for (cp2--; cp2 >= canonb && *cp2 == ' '; cp2--) | |
158 | ; | |
159 | *++cp2 = '\0'; | |
160 | prefix(canonb); | |
161 | if (c != EOF) | |
162 | c = getc(fi); | |
163 | } | |
164 | } | |
165 | ||
166 | /* | |
167 | * Take a line devoid of tabs and other garbage and determine its | |
168 | * blank prefix. If the indent changes, call for a linebreak. | |
169 | * If the input line is blank, echo the blank line on the output. | |
170 | * Finally, if the line minus the prefix is a mail header, try to keep | |
171 | * it on a line by itself. | |
172 | */ | |
173 | ||
174 | prefix(line) | |
175 | char line[]; | |
176 | { | |
177 | register char *cp, **hp; | |
178 | register int np, h; | |
179 | ||
180 | if (strlen(line) == 0) { | |
181 | oflush(); | |
182 | putchar('\n'); | |
183 | return; | |
184 | } | |
185 | for (cp = line; *cp == ' '; cp++) | |
186 | ; | |
187 | np = cp - line; | |
188 | ||
189 | /* | |
190 | * The following horrible expression attempts to avoid linebreaks | |
191 | * when the indent changes due to a paragraph. | |
192 | */ | |
193 | ||
194 | if (np != pfx && (np > pfx || abs(pfx-np) > 8)) | |
195 | oflush(); | |
196 | if (h = ishead(cp)) | |
197 | oflush(), mark = lineno; | |
198 | if (lineno - mark < 3 && lineno - mark > 0) | |
199 | for (hp = &headnames[0]; *hp != (char *) 0; hp++) | |
200 | if (ispref(*hp, cp)) { | |
201 | h = 1; | |
202 | oflush(); | |
203 | break; | |
204 | } | |
205 | if (!h && (h = (*cp == '.'))) | |
206 | oflush(); | |
207 | pfx = np; | |
208 | split(cp); | |
209 | if (h) | |
210 | oflush(); | |
211 | lineno++; | |
212 | } | |
213 | ||
214 | /* | |
215 | * Split up the passed line into output "words" which are | |
216 | * maximal strings of non-blanks with the blank separation | |
217 | * attached at the end. Pass these words along to the output | |
218 | * line packer. | |
219 | */ | |
220 | ||
221 | split(line) | |
222 | char line[]; | |
223 | { | |
224 | register char *cp, *cp2; | |
225 | char word[BUFSIZ]; | |
226 | ||
227 | cp = line; | |
228 | while (*cp) { | |
229 | cp2 = word; | |
230 | ||
231 | /* | |
232 | * Collect a 'word,' allowing it to contain escaped | |
233 | * white space. | |
234 | */ | |
235 | ||
236 | while (*cp && *cp != ' ') { | |
237 | if (*cp == '\\' && isspace(cp[1])) | |
238 | *cp2++ = *cp++; | |
239 | *cp2++ = *cp++; | |
240 | } | |
241 | ||
242 | /* | |
243 | * Guarantee a space at end of line. | |
244 | * Two spaces after end of sentence punctuation. | |
245 | */ | |
246 | ||
247 | if (*cp == '\0') { | |
248 | *cp2++ = ' '; | |
ffb99c43 | 249 | if (any(cp[-1], ".:!?")) |
79e55e87 KS |
250 | *cp2++ = ' '; |
251 | } | |
252 | while (*cp == ' ') | |
253 | *cp2++ = *cp++; | |
254 | *cp2 = '\0'; | |
255 | pack(word); | |
256 | } | |
257 | } | |
258 | ||
259 | /* | |
260 | * Output section. | |
261 | * Build up line images from the words passed in. Prefix | |
262 | * each line with correct number of blanks. The buffer "outbuf" | |
263 | * contains the current partial line image, including prefixed blanks. | |
264 | * "outp" points to the next available space therein. When outp is NOSTR, | |
265 | * there ain't nothing in there yet. At the bottom of this whole mess, | |
266 | * leading tabs are reinserted. | |
267 | */ | |
268 | ||
269 | char outbuf[BUFSIZ]; /* Sandbagged output line image */ | |
270 | char *outp; /* Pointer in above */ | |
271 | ||
272 | /* | |
273 | * Initialize the output section. | |
274 | */ | |
275 | ||
276 | setout() | |
277 | { | |
278 | outp = NOSTR; | |
279 | } | |
280 | ||
281 | /* | |
282 | * Pack a word onto the output line. If this is the beginning of | |
283 | * the line, push on the appropriately-sized string of blanks first. | |
284 | * If the word won't fit on the current line, flush and begin a new | |
285 | * line. If the word is too long to fit all by itself on a line, | |
286 | * just give it its own and hope for the best. | |
287 | */ | |
288 | ||
289 | pack(word) | |
290 | char word[]; | |
291 | { | |
292 | register char *cp; | |
293 | register int s, t; | |
294 | ||
295 | if (outp == NOSTR) | |
296 | leadin(); | |
297 | t = strlen(word); | |
298 | s = outp-outbuf; | |
ff6a2eb1 | 299 | if (t+s <= width) { |
79e55e87 KS |
300 | |
301 | /* | |
302 | * In like flint! | |
303 | */ | |
304 | ||
305 | for (cp = word; *cp; *outp++ = *cp++) | |
306 | ; | |
307 | return; | |
308 | } | |
309 | if (s > pfx) { | |
310 | oflush(); | |
311 | leadin(); | |
312 | } | |
313 | for (cp = word; *cp; *outp++ = *cp++) | |
314 | ; | |
315 | } | |
316 | ||
317 | /* | |
318 | * If there is anything on the current output line, send it on | |
319 | * its way. Set outp to NOSTR to indicate the absence of the current | |
320 | * line prefix. | |
321 | */ | |
322 | ||
323 | oflush() | |
324 | { | |
325 | if (outp == NOSTR) | |
326 | return; | |
327 | *outp = '\0'; | |
328 | tabulate(outbuf); | |
329 | outp = NOSTR; | |
330 | } | |
331 | ||
332 | /* | |
333 | * Take the passed line buffer, insert leading tabs where possible, and | |
334 | * output on standard output (finally). | |
335 | */ | |
336 | ||
337 | tabulate(line) | |
338 | char line[]; | |
339 | { | |
340 | register char *cp, *cp2; | |
341 | register int b, t; | |
342 | ||
343 | /* | |
344 | * Toss trailing blanks in the output line. | |
345 | */ | |
346 | ||
347 | cp = line + strlen(line) - 1; | |
348 | while (cp >= line && *cp == ' ') | |
349 | cp--; | |
350 | *++cp = '\0'; | |
351 | ||
352 | /* | |
353 | * Count the leading blank space and tabulate. | |
354 | */ | |
355 | ||
356 | for (cp = line; *cp == ' '; cp++) | |
357 | ; | |
358 | b = cp-line; | |
359 | t = b >> 3; | |
360 | b &= 07; | |
361 | if (t > 0) | |
362 | do | |
363 | putc('\t', stdout); | |
364 | while (--t); | |
365 | if (b > 0) | |
366 | do | |
367 | putc(' ', stdout); | |
368 | while (--b); | |
369 | while (*cp) | |
370 | putc(*cp++, stdout); | |
371 | putc('\n', stdout); | |
372 | } | |
373 | ||
374 | /* | |
375 | * Initialize the output line with the appropriate number of | |
376 | * leading blanks. | |
377 | */ | |
378 | ||
379 | leadin() | |
380 | { | |
381 | register int b; | |
382 | register char *cp; | |
383 | ||
384 | for (b = 0, cp = outbuf; b < pfx; b++) | |
385 | *cp++ = ' '; | |
386 | outp = cp; | |
387 | } | |
388 | ||
389 | /* | |
390 | * Save a string in dynamic space. | |
391 | * This little goodie is needed for | |
392 | * a headline detector in head.c | |
393 | */ | |
394 | ||
395 | char * | |
396 | savestr(str) | |
397 | char str[]; | |
398 | { | |
399 | register char *top; | |
400 | ||
401 | top = calloc(strlen(str) + 1, 1); | |
402 | if (top == NOSTR) { | |
403 | fprintf(stderr, "fmt: Ran out of memory\n"); | |
404 | exit(1); | |
405 | } | |
406 | copy(str, top); | |
407 | return(top); | |
408 | } | |
409 | ||
410 | /* | |
411 | * Is s1 a prefix of s2?? | |
412 | */ | |
413 | ||
414 | ispref(s1, s2) | |
415 | register char *s1, *s2; | |
416 | { | |
417 | ||
418 | while (*s1++ == *s2) | |
419 | ; | |
420 | return(*s1 == '\0'); | |
421 | } |