Commit | Line | Data |
---|---|---|
2ae9f53f SL |
1 | #ifndef lint |
2 | static char sccsid[] = "@(#)aux.c 2.11 (Berkeley) %G%"; | |
3 | #endif | |
6447a23f KS |
4 | |
5 | #include "rcv.h" | |
6 | #include <sys/stat.h> | |
6447a23f KS |
7 | #include <ctype.h> |
8 | ||
9 | /* | |
10 | * Mail -- a mail program | |
11 | * | |
12 | * Auxiliary functions. | |
13 | */ | |
14 | ||
6447a23f KS |
15 | /* |
16 | * Return a pointer to a dynamic copy of the argument. | |
17 | */ | |
18 | ||
19 | char * | |
20 | savestr(str) | |
21 | char *str; | |
22 | { | |
23 | register char *cp, *cp2, *top; | |
24 | ||
25 | for (cp = str; *cp; cp++) | |
26 | ; | |
27 | top = salloc(cp-str + 1); | |
28 | if (top == NOSTR) | |
29 | return(NOSTR); | |
30 | for (cp = str, cp2 = top; *cp; cp++) | |
31 | *cp2++ = *cp; | |
32 | *cp2 = 0; | |
33 | return(top); | |
34 | } | |
35 | ||
36 | /* | |
37 | * Copy the name from the passed header line into the passed | |
38 | * name buffer. Null pad the name buffer. | |
39 | */ | |
40 | ||
41 | copyname(linebuf, nbuf) | |
42 | char *linebuf, *nbuf; | |
43 | { | |
44 | register char *cp, *cp2; | |
45 | ||
46 | for (cp = linebuf + 5, cp2 = nbuf; *cp != ' ' && cp2-nbuf < 8; cp++) | |
47 | *cp2++ = *cp; | |
48 | while (cp2-nbuf < 8) | |
49 | *cp2++ = 0; | |
50 | } | |
51 | ||
52 | /* | |
53 | * Announce a fatal error and die. | |
54 | */ | |
55 | ||
56 | panic(str) | |
57 | char *str; | |
58 | { | |
59 | prs("panic: "); | |
60 | prs(str); | |
61 | prs("\n"); | |
62 | exit(1); | |
63 | } | |
64 | ||
65 | /* | |
66 | * Catch stdio errors and report them more nicely. | |
67 | */ | |
68 | ||
69 | _error(str) | |
70 | char *str; | |
71 | { | |
72 | prs("Stdio Error: "); | |
73 | prs(str); | |
74 | prs("\n"); | |
75 | abort(); | |
76 | } | |
77 | ||
78 | /* | |
79 | * Print a string on diagnostic output. | |
80 | */ | |
81 | ||
82 | prs(str) | |
83 | char *str; | |
84 | { | |
85 | register char *s; | |
86 | ||
87 | for (s = str; *s; s++) | |
88 | ; | |
89 | write(2, str, s-str); | |
90 | } | |
91 | ||
92 | /* | |
93 | * Touch the named message by setting its MTOUCH flag. | |
94 | * Touched messages have the effect of not being sent | |
95 | * back to the system mailbox on exit. | |
96 | */ | |
97 | ||
98 | touch(mesg) | |
99 | { | |
dffe7e4f KS |
100 | register struct message *mp; |
101 | ||
102 | if (mesg < 1 || mesg > msgCount) | |
103 | return; | |
104 | mp = &message[mesg-1]; | |
105 | mp->m_flag |= MTOUCH; | |
106 | if ((mp->m_flag & MREAD) == 0) | |
107 | mp->m_flag |= MREAD|MSTATUS; | |
6447a23f KS |
108 | } |
109 | ||
110 | /* | |
111 | * Test to see if the passed file name is a directory. | |
112 | * Return true if it is. | |
113 | */ | |
114 | ||
115 | isdir(name) | |
116 | char name[]; | |
117 | { | |
118 | struct stat sbuf; | |
119 | ||
120 | if (stat(name, &sbuf) < 0) | |
121 | return(0); | |
122 | return((sbuf.st_mode & S_IFMT) == S_IFDIR); | |
123 | } | |
124 | ||
6447a23f KS |
125 | /* |
126 | * Count the number of arguments in the given string raw list. | |
127 | */ | |
128 | ||
129 | argcount(argv) | |
130 | char **argv; | |
131 | { | |
132 | register char **ap; | |
133 | ||
134 | for (ap = argv; *ap != NOSTR; ap++) | |
135 | ; | |
136 | return(ap-argv); | |
137 | } | |
138 | ||
139 | /* | |
140 | * Given a file address, determine the | |
141 | * block number it represents. | |
142 | */ | |
143 | ||
144 | blockof(off) | |
145 | off_t off; | |
146 | { | |
147 | off_t a; | |
148 | ||
149 | a = off >> 9; | |
150 | a &= 077777; | |
151 | return((int) a); | |
152 | } | |
153 | ||
154 | /* | |
155 | * Take a file address, and determine | |
156 | * its offset in the current block. | |
157 | */ | |
158 | ||
159 | offsetof(off) | |
160 | off_t off; | |
161 | { | |
162 | off_t a; | |
163 | ||
164 | a = off & 0777; | |
165 | return((int) a); | |
166 | } | |
167 | ||
168 | /* | |
169 | * Determine if the passed file is actually a tty, via a call to | |
170 | * gtty. This is not totally reliable, but . . . | |
171 | */ | |
172 | ||
173 | isatty(f) | |
174 | { | |
175 | struct sgttyb buf; | |
176 | ||
177 | if (gtty(f, &buf) < 0) | |
178 | return(0); | |
179 | return(1); | |
180 | } | |
181 | ||
182 | /* | |
183 | * Return the desired header line from the passed message | |
184 | * pointer (or NOSTR if the desired header field is not available). | |
185 | */ | |
186 | ||
187 | char * | |
188 | hfield(field, mp) | |
189 | char field[]; | |
190 | struct message *mp; | |
191 | { | |
192 | register FILE *ibuf; | |
193 | char linebuf[LINESIZE]; | |
194 | register int lc; | |
195 | ||
196 | ibuf = setinput(mp); | |
197 | if ((lc = mp->m_lines) <= 0) | |
198 | return(NOSTR); | |
199 | if (readline(ibuf, linebuf) < 0) | |
200 | return(NOSTR); | |
201 | lc--; | |
202 | do { | |
203 | lc = gethfield(ibuf, linebuf, lc); | |
204 | if (lc == -1) | |
205 | return(NOSTR); | |
206 | if (ishfield(linebuf, field)) | |
207 | return(savestr(hcontents(linebuf))); | |
208 | } while (lc > 0); | |
209 | return(NOSTR); | |
210 | } | |
211 | ||
212 | /* | |
213 | * Return the next header field found in the given message. | |
214 | * Return > 0 if something found, <= 0 elsewise. | |
215 | * Must deal with \ continuations & other such fraud. | |
216 | */ | |
217 | ||
218 | gethfield(f, linebuf, rem) | |
219 | register FILE *f; | |
220 | char linebuf[]; | |
221 | register int rem; | |
222 | { | |
223 | char line2[LINESIZE]; | |
224 | long loc; | |
225 | register char *cp, *cp2; | |
226 | register int c; | |
227 | ||
228 | ||
229 | for (;;) { | |
230 | if (rem <= 0) | |
231 | return(-1); | |
232 | if (readline(f, linebuf) < 0) | |
233 | return(-1); | |
234 | rem--; | |
235 | if (strlen(linebuf) == 0) | |
236 | return(-1); | |
237 | if (isspace(linebuf[0])) | |
238 | continue; | |
239 | if (linebuf[0] == '>') | |
240 | continue; | |
241 | cp = index(linebuf, ':'); | |
242 | if (cp == NOSTR) | |
243 | continue; | |
244 | for (cp2 = linebuf; cp2 < cp; cp2++) | |
245 | if (isdigit(*cp2)) | |
246 | continue; | |
247 | ||
248 | /* | |
249 | * I guess we got a headline. | |
250 | * Handle wraparounding | |
251 | */ | |
252 | ||
253 | for (;;) { | |
254 | if (rem <= 0) | |
255 | break; | |
256 | #ifdef CANTELL | |
257 | loc = ftell(f); | |
258 | if (readline(f, line2) < 0) | |
259 | break; | |
260 | rem--; | |
261 | if (!isspace(line2[0])) { | |
262 | fseek(f, loc, 0); | |
263 | rem++; | |
264 | break; | |
265 | } | |
266 | #else | |
267 | c = getc(f); | |
268 | ungetc(c, f); | |
269 | if (!isspace(c) || c == '\n') | |
270 | break; | |
271 | if (readline(f, line2) < 0) | |
272 | break; | |
273 | rem--; | |
274 | #endif | |
275 | cp2 = line2; | |
276 | for (cp2 = line2; *cp2 != 0 && isspace(*cp2); cp2++) | |
277 | ; | |
278 | if (strlen(linebuf) + strlen(cp2) >= LINESIZE-2) | |
279 | break; | |
280 | cp = &linebuf[strlen(linebuf)]; | |
281 | while (cp > linebuf && | |
282 | (isspace(cp[-1]) || cp[-1] == '\\')) | |
283 | cp--; | |
284 | *cp++ = ' '; | |
285 | for (cp2 = line2; *cp2 != 0 && isspace(*cp2); cp2++) | |
286 | ; | |
287 | strcpy(cp, cp2); | |
288 | } | |
289 | if ((c = strlen(linebuf)) > 0) { | |
290 | cp = &linebuf[c-1]; | |
291 | while (cp > linebuf && isspace(*cp)) | |
292 | cp--; | |
293 | *++cp = 0; | |
294 | } | |
295 | return(rem); | |
296 | } | |
297 | /* NOTREACHED */ | |
298 | } | |
299 | ||
300 | /* | |
301 | * Check whether the passed line is a header line of | |
302 | * the desired breed. | |
303 | */ | |
304 | ||
305 | ishfield(linebuf, field) | |
306 | char linebuf[], field[]; | |
307 | { | |
308 | register char *cp; | |
309 | register int c; | |
310 | ||
311 | if ((cp = index(linebuf, ':')) == NOSTR) | |
312 | return(0); | |
313 | if (cp == linebuf) | |
314 | return(0); | |
315 | cp--; | |
316 | while (cp > linebuf && isspace(*cp)) | |
317 | cp--; | |
318 | c = *++cp; | |
319 | *cp = 0; | |
320 | if (icequal(linebuf ,field)) { | |
321 | *cp = c; | |
322 | return(1); | |
323 | } | |
324 | *cp = c; | |
325 | return(0); | |
326 | } | |
327 | ||
328 | /* | |
329 | * Extract the non label information from the given header field | |
330 | * and return it. | |
331 | */ | |
332 | ||
333 | char * | |
334 | hcontents(hfield) | |
335 | char hfield[]; | |
336 | { | |
337 | register char *cp; | |
338 | ||
339 | if ((cp = index(hfield, ':')) == NOSTR) | |
340 | return(NOSTR); | |
341 | cp++; | |
342 | while (*cp && isspace(*cp)) | |
343 | cp++; | |
344 | return(cp); | |
345 | } | |
346 | ||
347 | /* | |
348 | * Compare two strings, ignoring case. | |
349 | */ | |
350 | ||
351 | icequal(s1, s2) | |
352 | register char *s1, *s2; | |
353 | { | |
354 | ||
355 | while (raise(*s1++) == raise(*s2)) | |
356 | if (*s2++ == 0) | |
357 | return(1); | |
358 | return(0); | |
359 | } | |
360 | ||
da0d3a6d KS |
361 | /* |
362 | * Copy a string, lowercasing it as we go. | |
363 | */ | |
364 | istrcpy(dest, src) | |
365 | char *dest, *src; | |
366 | { | |
367 | register char *cp, *cp2; | |
368 | ||
369 | cp2 = dest; | |
370 | cp = src; | |
371 | do { | |
372 | *cp2++ = little(*cp); | |
373 | } while (*cp++ != 0); | |
374 | } | |
375 | ||
6447a23f KS |
376 | /* |
377 | * The following code deals with input stacking to do source | |
378 | * commands. All but the current file pointer are saved on | |
379 | * the stack. | |
380 | */ | |
381 | ||
382 | static int ssp = -1; /* Top of file stack */ | |
e48b42f1 KS |
383 | struct sstack { |
384 | FILE *s_file; /* File we were in. */ | |
385 | int s_cond; /* Saved state of conditionals */ | |
f4aa38b5 | 386 | int s_loading; /* Loading .mailrc, etc. */ |
e48b42f1 | 387 | } sstack[_NFILE]; |
6447a23f KS |
388 | |
389 | /* | |
390 | * Pushdown current input file and switch to a new one. | |
391 | * Set the global flag "sourcing" so that others will realize | |
392 | * that they are no longer reading from a tty (in all probability). | |
393 | */ | |
394 | ||
395 | source(name) | |
396 | char name[]; | |
397 | { | |
398 | register FILE *fi; | |
5c7ba847 | 399 | register char *cp; |
6447a23f | 400 | |
5c7ba847 KS |
401 | if ((cp = expand(name)) == NOSTR) |
402 | return(1); | |
403 | if ((fi = fopen(cp, "r")) == NULL) { | |
404 | perror(cp); | |
6447a23f KS |
405 | return(1); |
406 | } | |
407 | if (ssp >= _NFILE-2) { | |
408 | printf("Too much \"sourcing\" going on.\n"); | |
409 | fclose(fi); | |
410 | return(1); | |
411 | } | |
e48b42f1 KS |
412 | sstack[++ssp].s_file = input; |
413 | sstack[ssp].s_cond = cond; | |
f4aa38b5 KS |
414 | sstack[ssp].s_loading = loading; |
415 | loading = 0; | |
e48b42f1 | 416 | cond = CANY; |
6447a23f KS |
417 | input = fi; |
418 | sourcing++; | |
419 | return(0); | |
420 | } | |
421 | ||
422 | /* | |
423 | * Source a file, but do nothing if the file cannot be opened. | |
424 | */ | |
425 | ||
426 | source1(name) | |
427 | char name[]; | |
428 | { | |
429 | register int f; | |
430 | ||
431 | if ((f = open(name, 0)) < 0) | |
432 | return(0); | |
433 | close(f); | |
434 | source(name); | |
435 | } | |
436 | ||
437 | /* | |
438 | * Pop the current input back to the previous level. | |
439 | * Update the "sourcing" flag as appropriate. | |
440 | */ | |
441 | ||
442 | unstack() | |
443 | { | |
444 | if (ssp < 0) { | |
445 | printf("\"Source\" stack over-pop.\n"); | |
446 | sourcing = 0; | |
447 | return(1); | |
448 | } | |
449 | fclose(input); | |
e48b42f1 KS |
450 | if (cond != CANY) |
451 | printf("Unmatched \"if\"\n"); | |
452 | cond = sstack[ssp].s_cond; | |
f4aa38b5 | 453 | loading = sstack[ssp].s_loading; |
e48b42f1 | 454 | input = sstack[ssp--].s_file; |
6447a23f | 455 | if (ssp < 0) |
f4aa38b5 | 456 | sourcing = loading; |
6447a23f KS |
457 | return(0); |
458 | } | |
459 | ||
460 | /* | |
461 | * Touch the indicated file. | |
462 | * This is nifty for the shell. | |
463 | * If we have the utime() system call, this is better served | |
464 | * by using that, since it will work for empty files. | |
465 | * On non-utime systems, we must sleep a second, then read. | |
466 | */ | |
467 | ||
468 | alter(name) | |
469 | char name[]; | |
470 | { | |
471 | #ifdef UTIME | |
472 | struct stat statb; | |
473 | long time(); | |
474 | time_t time_p[2]; | |
475 | #else | |
476 | register int pid, f; | |
477 | char w; | |
478 | #endif UTIME | |
479 | ||
480 | #ifdef UTIME | |
481 | if (stat(name, &statb) < 0) | |
482 | return; | |
483 | time_p[0] = time((long *) 0) + 1; | |
484 | time_p[1] = statb.st_mtime; | |
485 | utime(name, time_p); | |
486 | #else | |
6447a23f KS |
487 | sleep(1); |
488 | if ((f = open(name, 0)) < 0) | |
a0852086 | 489 | return; |
6447a23f KS |
490 | read(f, &w, 1); |
491 | exit(0); | |
492 | #endif | |
493 | } | |
494 | ||
495 | /* | |
496 | * Examine the passed line buffer and | |
497 | * return true if it is all blanks and tabs. | |
498 | */ | |
499 | ||
500 | blankline(linebuf) | |
501 | char linebuf[]; | |
502 | { | |
503 | register char *cp; | |
504 | ||
505 | for (cp = linebuf; *cp; cp++) | |
506 | if (!any(*cp, " \t")) | |
507 | return(0); | |
508 | return(1); | |
509 | } | |
510 | ||
12388009 KS |
511 | /* |
512 | * Get sender's name from this message. If the message has | |
513 | * a bunch of arpanet stuff in it, we may have to skin the name | |
514 | * before returning it. | |
515 | */ | |
516 | char * | |
517 | nameof(mp, reptype) | |
518 | register struct message *mp; | |
519 | { | |
8bcfa450 | 520 | register char *cp, *cp2; |
12388009 | 521 | |
8bcfa450 KS |
522 | cp = skin(name1(mp, reptype)); |
523 | if (reptype != 0 || charcount(cp, '!') < 2) | |
524 | return(cp); | |
525 | cp2 = rindex(cp, '!'); | |
526 | cp2--; | |
527 | while (cp2 > cp && *cp2 != '!') | |
528 | cp2--; | |
529 | if (*cp2 == '!') | |
530 | return(cp2 + 1); | |
531 | return(cp); | |
12388009 KS |
532 | } |
533 | ||
534 | /* | |
535 | * Skin an arpa net address according to the RFC 733 interpretation | |
536 | * of "host-phrase." | |
537 | */ | |
538 | char * | |
539 | skin(name) | |
540 | char *name; | |
541 | { | |
542 | register int c; | |
543 | register char *cp, *cp2; | |
544 | int gotlt, lastsp; | |
545 | char nbuf[BUFSIZ]; | |
546 | ||
547 | if (name == NOSTR) | |
548 | return(NOSTR); | |
e557a09a CL |
549 | if (index(name, '(') == NOSTR && index(name, '<') == NOSTR |
550 | && index(name, ' ') == NOSTR) | |
12388009 KS |
551 | return(name); |
552 | gotlt = 0; | |
553 | lastsp = 0; | |
e557a09a | 554 | for (cp = name, cp2 = nbuf; c = *cp++; ) { |
12388009 KS |
555 | switch (c) { |
556 | case '(': | |
557 | while (*cp != ')' && *cp != 0) | |
558 | cp++; | |
559 | if (*cp) | |
560 | cp++; | |
e557a09a | 561 | lastsp = 0; |
12388009 KS |
562 | break; |
563 | ||
564 | case ' ': | |
e557a09a CL |
565 | if (cp[0] == 'a' && cp[1] == 't' && cp[2] == ' ') |
566 | cp += 3, *cp2++ = '@'; | |
567 | else | |
568 | if (cp[0] == '@' && cp[1] == ' ') | |
569 | cp += 2, *cp2++ = '@'; | |
570 | else | |
571 | lastsp = 1; | |
12388009 KS |
572 | break; |
573 | ||
574 | case '<': | |
575 | cp2 = nbuf; | |
576 | gotlt++; | |
577 | lastsp = 0; | |
578 | break; | |
579 | ||
580 | case '>': | |
581 | if (gotlt) | |
582 | goto done; | |
583 | ||
584 | /* Fall into . . . */ | |
585 | ||
586 | default: | |
587 | if (lastsp) { | |
588 | lastsp = 0; | |
589 | *cp2++ = ' '; | |
590 | } | |
591 | *cp2++ = c; | |
592 | break; | |
593 | } | |
594 | } | |
595 | done: | |
596 | *cp2 = 0; | |
597 | ||
598 | return(savestr(nbuf)); | |
599 | } | |
600 | ||
6447a23f KS |
601 | /* |
602 | * Fetch the sender's name from the passed message. | |
12388009 KS |
603 | * Reptype can be |
604 | * 0 -- get sender's name for display purposes | |
605 | * 1 -- get sender's name for reply | |
606 | * 2 -- get sender's name for Reply | |
6447a23f KS |
607 | */ |
608 | ||
609 | char * | |
12388009 | 610 | name1(mp, reptype) |
6447a23f KS |
611 | register struct message *mp; |
612 | { | |
613 | char namebuf[LINESIZE]; | |
614 | char linebuf[LINESIZE]; | |
615 | register char *cp, *cp2; | |
616 | register FILE *ibuf; | |
617 | int first = 1; | |
618 | ||
12388009 KS |
619 | if ((cp = hfield("from", mp)) != NOSTR) |
620 | return(cp); | |
621 | if (reptype == 0 && (cp = hfield("sender", mp)) != NOSTR) | |
622 | return(cp); | |
6447a23f KS |
623 | ibuf = setinput(mp); |
624 | copy("", namebuf); | |
625 | if (readline(ibuf, linebuf) <= 0) | |
626 | return(savestr(namebuf)); | |
627 | newname: | |
628 | for (cp = linebuf; *cp != ' '; cp++) | |
629 | ; | |
630 | while (any(*cp, " \t")) | |
631 | cp++; | |
632 | for (cp2 = &namebuf[strlen(namebuf)]; *cp && !any(*cp, " \t") && | |
633 | cp2-namebuf < LINESIZE-1; *cp2++ = *cp++) | |
634 | ; | |
635 | *cp2 = '\0'; | |
636 | if (readline(ibuf, linebuf) <= 0) | |
637 | return(savestr(namebuf)); | |
638 | if ((cp = index(linebuf, 'F')) == NULL) | |
639 | return(savestr(namebuf)); | |
640 | if (strncmp(cp, "From", 4) != 0) | |
641 | return(savestr(namebuf)); | |
642 | while ((cp = index(cp, 'r')) != NULL) { | |
643 | if (strncmp(cp, "remote", 6) == 0) { | |
644 | if ((cp = index(cp, 'f')) == NULL) | |
645 | break; | |
646 | if (strncmp(cp, "from", 4) != 0) | |
647 | break; | |
648 | if ((cp = index(cp, ' ')) == NULL) | |
649 | break; | |
650 | cp++; | |
651 | if (first) { | |
652 | copy(cp, namebuf); | |
653 | first = 0; | |
654 | } else | |
655 | strcpy(rindex(namebuf, '!')+1, cp); | |
656 | strcat(namebuf, "!"); | |
657 | goto newname; | |
658 | } | |
659 | cp++; | |
660 | } | |
661 | return(savestr(namebuf)); | |
662 | } | |
663 | ||
8bcfa450 KS |
664 | /* |
665 | * Count the occurances of c in str | |
666 | */ | |
667 | charcount(str, c) | |
668 | char *str; | |
669 | { | |
670 | register char *cp; | |
671 | register int i; | |
672 | ||
673 | for (i = 0, cp = str; *cp; cp++) | |
674 | if (*cp == c) | |
675 | i++; | |
676 | return(i); | |
677 | } | |
678 | ||
6447a23f KS |
679 | /* |
680 | * Find the rightmost pointer to an instance of the | |
681 | * character in the string and return it. | |
682 | */ | |
6447a23f KS |
683 | char * |
684 | rindex(str, c) | |
685 | char str[]; | |
686 | register int c; | |
687 | { | |
688 | register char *cp, *cp2; | |
689 | ||
690 | for (cp = str, cp2 = NOSTR; *cp; cp++) | |
691 | if (c == *cp) | |
692 | cp2 = cp; | |
693 | return(cp2); | |
694 | } | |
695 | ||
696 | /* | |
697 | * See if the string is a number. | |
698 | */ | |
699 | ||
700 | numeric(str) | |
701 | char str[]; | |
702 | { | |
703 | register char *cp = str; | |
704 | ||
705 | while (*cp) | |
706 | if (!isdigit(*cp++)) | |
707 | return(0); | |
708 | return(1); | |
709 | } | |
710 | ||
711 | /* | |
712 | * Are any of the characters in the two strings the same? | |
713 | */ | |
714 | ||
715 | anyof(s1, s2) | |
716 | register char *s1, *s2; | |
717 | { | |
718 | register int c; | |
719 | ||
720 | while (c = *s1++) | |
721 | if (any(c, s2)) | |
722 | return(1); | |
723 | return(0); | |
724 | } | |
725 | ||
726 | /* | |
727 | * Determine the leftmost index of the character | |
728 | * in the string. | |
729 | */ | |
730 | ||
731 | char * | |
732 | index(str, ch) | |
733 | char *str; | |
734 | { | |
735 | register char *cp; | |
736 | register int c; | |
737 | ||
738 | for (c = ch, cp = str; *cp; cp++) | |
739 | if (*cp == c) | |
740 | return(cp); | |
741 | return(NOSTR); | |
742 | } | |
743 | ||
744 | /* | |
745 | * String compare two strings of bounded length. | |
746 | */ | |
747 | ||
748 | strncmp(as1, as2, an) | |
749 | char *as1, *as2; | |
750 | { | |
751 | register char *s1, *s2; | |
752 | register int n; | |
753 | ||
754 | s1 = as1; | |
755 | s2 = as2; | |
756 | n = an; | |
757 | while (--n >= 0 && *s1 == *s2++) | |
758 | if (*s1++ == '\0') | |
759 | return(0); | |
760 | return(n<0 ? 0 : *s1 - *--s2); | |
761 | } | |
762 | ||
da0d3a6d KS |
763 | /* |
764 | * See if the given header field is supposed to be ignored. | |
765 | */ | |
766 | isign(field) | |
767 | char *field; | |
768 | { | |
769 | char realfld[BUFSIZ]; | |
770 | register int h; | |
771 | register struct ignore *igp; | |
772 | ||
773 | istrcpy(realfld, field); | |
774 | h = hash(realfld); | |
775 | for (igp = ignore[h]; igp != 0; igp = igp->i_link) | |
776 | if (strcmp(igp->i_field, realfld) == 0) | |
777 | return(1); | |
778 | return(0); | |
779 | } |