util.c revision 8874 
1/*
2 * Copyright (c) 1980, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static char sccsid[] = "@(#)aux.c	8.1 (Berkeley) 6/6/93";
36#endif /* not lint */
37
38#include "rcv.h"
39#include "extern.h"
40
41/*
42 * Mail -- a mail program
43 *
44 * Auxiliary functions.
45 */
46
47/*
48 * Return a pointer to a dynamic copy of the argument.
49 */
50char *
51savestr(str)
52	char *str;
53{
54	char *new;
55	int size = strlen(str) + 1;
56
57	if ((new = salloc(size)) != NOSTR)
58		bcopy(str, new, size);
59	return new;
60}
61
62/*
63 * Make a copy of new argument incorporating old one.
64 */
65char *
66save2str(str, old)
67	char *str, *old;
68{
69	char *new;
70	int newsize = strlen(str) + 1;
71	int oldsize = old ? strlen(old) + 1 : 0;
72
73	if ((new = salloc(newsize + oldsize)) != NOSTR) {
74		if (oldsize) {
75			bcopy(old, new, oldsize);
76			new[oldsize - 1] = ' ';
77		}
78		bcopy(str, new + oldsize, newsize);
79	}
80	return new;
81}
82
83/*
84 * Announce a fatal error and die.
85 */
86#if __STDC__
87#include <stdarg.h>
88#else
89#include <varargs.h>
90#endif
91
92void
93#if __STDC__
94panic(const char *fmt, ...)
95#else
96panic(fmt, va_alist)
97	char *fmt;
98        va_dcl
99#endif
100{
101	va_list ap;
102#if __STDC__
103	va_start(ap, fmt);
104#else
105	va_start(ap);
106#endif
107	(void)fprintf(stderr, "panic: ");
108	vfprintf(stderr, fmt, ap);
109	va_end(ap);
110	(void)fprintf(stderr, "\n");
111	fflush(stderr);
112	abort();
113}
114
115/*
116 * Touch the named message by setting its MTOUCH flag.
117 * Touched messages have the effect of not being sent
118 * back to the system mailbox on exit.
119 */
120void
121touch(mp)
122	register struct message *mp;
123{
124
125	mp->m_flag |= MTOUCH;
126	if ((mp->m_flag & MREAD) == 0)
127		mp->m_flag |= MREAD|MSTATUS;
128}
129
130/*
131 * Test to see if the passed file name is a directory.
132 * Return true if it is.
133 */
134int
135isdir(name)
136	char name[];
137{
138	struct stat sbuf;
139
140	if (stat(name, &sbuf) < 0)
141		return(0);
142	return((sbuf.st_mode & S_IFMT) == S_IFDIR);
143}
144
145/*
146 * Count the number of arguments in the given string raw list.
147 */
148int
149argcount(argv)
150	char **argv;
151{
152	register char **ap;
153
154	for (ap = argv; *ap++ != NOSTR;)
155		;
156	return ap - argv - 1;
157}
158
159/*
160 * Return the desired header line from the passed message
161 * pointer (or NOSTR if the desired header field is not available).
162 */
163char *
164hfield(field, mp)
165	char field[];
166	struct message *mp;
167{
168	register FILE *ibuf;
169	char linebuf[LINESIZE];
170	register int lc;
171	register char *hfield;
172	char *colon, *oldhfield = NOSTR;
173
174	ibuf = setinput(mp);
175	if ((lc = mp->m_lines - 1) < 0)
176		return NOSTR;
177	if (readline(ibuf, linebuf, LINESIZE) < 0)
178		return NOSTR;
179	while (lc > 0) {
180		if ((lc = gethfield(ibuf, linebuf, lc, &colon)) < 0)
181			return oldhfield;
182		if (hfield = ishfield(linebuf, colon, field))
183			oldhfield = save2str(hfield, oldhfield);
184	}
185	return oldhfield;
186}
187
188/*
189 * Return the next header field found in the given message.
190 * Return >= 0 if something found, < 0 elsewise.
191 * "colon" is set to point to the colon in the header.
192 * Must deal with \ continuations & other such fraud.
193 */
194int
195gethfield(f, linebuf, rem, colon)
196	register FILE *f;
197	char linebuf[];
198	register int rem;
199	char **colon;
200{
201	char line2[LINESIZE];
202	register char *cp, *cp2;
203	register int c;
204
205	for (;;) {
206		if (--rem < 0)
207			return -1;
208		if ((c = readline(f, linebuf, LINESIZE)) <= 0)
209			return -1;
210		for (cp = linebuf; isprint(*cp) && *cp != ' ' && *cp != ':';
211		     cp++)
212			;
213		if (*cp != ':' || cp == linebuf)
214			continue;
215		/*
216		 * I guess we got a headline.
217		 * Handle wraparounding
218		 */
219		*colon = cp;
220		cp = linebuf + c;
221		for (;;) {
222			while (--cp >= linebuf && (*cp == ' ' || *cp == '\t'))
223				;
224			cp++;
225			if (rem <= 0)
226				break;
227			ungetc(c = getc(f), f);
228			if (c != ' ' && c != '\t')
229				break;
230			if ((c = readline(f, line2, LINESIZE)) < 0)
231				break;
232			rem--;
233			for (cp2 = line2; *cp2 == ' ' || *cp2 == '\t'; cp2++)
234				;
235			c -= cp2 - line2;
236			if (cp + c >= linebuf + LINESIZE - 2)
237				break;
238			*cp++ = ' ';
239			bcopy(cp2, cp, c);
240			cp += c;
241		}
242		*cp = 0;
243		return rem;
244	}
245	/* NOTREACHED */
246}
247
248/*
249 * Check whether the passed line is a header line of
250 * the desired breed.  Return the field body, or 0.
251 */
252
253char*
254ishfield(linebuf, colon, field)
255	char linebuf[], field[];
256	char *colon;
257{
258	register char *cp = colon;
259
260	*cp = 0;
261	if (strcasecmp(linebuf, field) != 0) {
262		*cp = ':';
263		return 0;
264	}
265	*cp = ':';
266	for (cp++; *cp == ' ' || *cp == '\t'; cp++)
267		;
268	return cp;
269}
270
271/*
272 * Copy a string, lowercasing it as we go.
273 */
274void
275istrcpy(dest, src)
276	register char *dest, *src;
277{
278
279	do {
280		if (isupper(*src))
281			*dest++ = tolower(*src);
282		else
283			*dest++ = *src;
284	} while (*src++ != 0);
285}
286
287/*
288 * The following code deals with input stacking to do source
289 * commands.  All but the current file pointer are saved on
290 * the stack.
291 */
292
293static	int	ssp;			/* Top of file stack */
294struct sstack {
295	FILE	*s_file;		/* File we were in. */
296	int	s_cond;			/* Saved state of conditionals */
297	int	s_loading;		/* Loading .mailrc, etc. */
298} sstack[NOFILE];
299
300/*
301 * Pushdown current input file and switch to a new one.
302 * Set the global flag "sourcing" so that others will realize
303 * that they are no longer reading from a tty (in all probability).
304 */
305int
306source(arglist)
307	char **arglist;
308{
309	FILE *fi;
310	char *cp;
311
312	if ((cp = expand(*arglist)) == NOSTR)
313		return(1);
314	if ((fi = Fopen(cp, "r")) == NULL) {
315		perror(cp);
316		return(1);
317	}
318	if (ssp >= NOFILE - 1) {
319		printf("Too much \"sourcing\" going on.\n");
320		Fclose(fi);
321		return(1);
322	}
323	sstack[ssp].s_file = input;
324	sstack[ssp].s_cond = cond;
325	sstack[ssp].s_loading = loading;
326	ssp++;
327	loading = 0;
328	cond = CANY;
329	input = fi;
330	sourcing++;
331	return(0);
332}
333
334/*
335 * Pop the current input back to the previous level.
336 * Update the "sourcing" flag as appropriate.
337 */
338int
339unstack()
340{
341	if (ssp <= 0) {
342		printf("\"Source\" stack over-pop.\n");
343		sourcing = 0;
344		return(1);
345	}
346	Fclose(input);
347	if (cond != CANY)
348		printf("Unmatched \"if\"\n");
349	ssp--;
350	cond = sstack[ssp].s_cond;
351	loading = sstack[ssp].s_loading;
352	input = sstack[ssp].s_file;
353	if (ssp == 0)
354		sourcing = loading;
355	return(0);
356}
357
358/*
359 * Touch the indicated file.
360 * This is nifty for the shell.
361 */
362void
363alter(name)
364	char *name;
365{
366	struct stat sb;
367	struct timeval tv[2];
368	time_t time();
369
370	if (stat(name, &sb))
371		return;
372	tv[0].tv_sec = time((time_t *)0) + 1;
373	tv[1].tv_sec = sb.st_mtime;
374	tv[0].tv_usec = tv[1].tv_usec = 0;
375	(void)utimes(name, tv);
376}
377
378/*
379 * Examine the passed line buffer and
380 * return true if it is all blanks and tabs.
381 */
382int
383blankline(linebuf)
384	char linebuf[];
385{
386	register char *cp;
387
388	for (cp = linebuf; *cp; cp++)
389		if (*cp != ' ' && *cp != '\t')
390			return(0);
391	return(1);
392}
393
394/*
395 * Get sender's name from this message.  If the message has
396 * a bunch of arpanet stuff in it, we may have to skin the name
397 * before returning it.
398 */
399char *
400nameof(mp, reptype)
401	register struct message *mp;
402	int reptype;
403{
404	register char *cp, *cp2;
405
406	cp = skin(name1(mp, reptype));
407	if (reptype != 0 || charcount(cp, '!') < 2)
408		return(cp);
409	cp2 = rindex(cp, '!');
410	cp2--;
411	while (cp2 > cp && *cp2 != '!')
412		cp2--;
413	if (*cp2 == '!')
414		return(cp2 + 1);
415	return(cp);
416}
417
418/*
419 * Start of a "comment".
420 * Ignore it.
421 */
422char *
423skip_comment(cp)
424	register char *cp;
425{
426	register nesting = 1;
427
428	for (; nesting > 0 && *cp; cp++) {
429		switch (*cp) {
430		case '\\':
431			if (cp[1])
432				cp++;
433			break;
434		case '(':
435			nesting++;
436			break;
437		case ')':
438			nesting--;
439			break;
440		}
441	}
442	return cp;
443}
444
445/*
446 * Skin an arpa net address according to the RFC 822 interpretation
447 * of "host-phrase."
448 */
449char *
450skin(name)
451	char *name;
452{
453	register int c;
454	register char *cp, *cp2;
455	char *bufend;
456	int gotlt, lastsp;
457	char nbuf[BUFSIZ];
458
459	if (name == NOSTR)
460		return(NOSTR);
461	if (index(name, '(') == NOSTR && index(name, '<') == NOSTR
462	    && index(name, ' ') == NOSTR)
463		return(name);
464	gotlt = 0;
465	lastsp = 0;
466	bufend = nbuf;
467	for (cp = name, cp2 = bufend; c = *cp++; ) {
468		switch (c) {
469		case '(':
470			cp = skip_comment(cp);
471			lastsp = 0;
472			break;
473
474		case '"':
475			/*
476			 * Start of a "quoted-string".
477			 * Copy it in its entirety.
478			 */
479			while (c = *cp) {
480				cp++;
481				if (c == '"')
482					break;
483				if (c != '\\')
484					*cp2++ = c;
485				else if (c = *cp) {
486					*cp2++ = c;
487					cp++;
488				}
489			}
490			lastsp = 0;
491			break;
492
493		case ' ':
494			if (cp[0] == 'a' && cp[1] == 't' && cp[2] == ' ')
495				cp += 3, *cp2++ = '@';
496			else
497			if (cp[0] == '@' && cp[1] == ' ')
498				cp += 2, *cp2++ = '@';
499			else
500				lastsp = 1;
501			break;
502
503		case '<':
504			cp2 = bufend;
505			gotlt++;
506			lastsp = 0;
507			break;
508
509		case '>':
510			if (gotlt) {
511				gotlt = 0;
512				while ((c = *cp) && c != ',') {
513					cp++;
514					if (c == '(')
515						cp = skip_comment(cp);
516					else if (c == '"')
517						while (c = *cp) {
518							cp++;
519							if (c == '"')
520								break;
521							if (c == '\\' && *cp)
522								cp++;
523						}
524				}
525				lastsp = 0;
526				break;
527			}
528			/* Fall into . . . */
529
530		default:
531			if (lastsp) {
532				lastsp = 0;
533				*cp2++ = ' ';
534			}
535			*cp2++ = c;
536			if (c == ',' && !gotlt) {
537				*cp2++ = ' ';
538				for (; *cp == ' '; cp++)
539					;
540				lastsp = 0;
541				bufend = cp2;
542			}
543		}
544	}
545	*cp2 = 0;
546
547	return(savestr(nbuf));
548}
549
550/*
551 * Fetch the sender's name from the passed message.
552 * Reptype can be
553 *	0 -- get sender's name for display purposes
554 *	1 -- get sender's name for reply
555 *	2 -- get sender's name for Reply
556 */
557char *
558name1(mp, reptype)
559	register struct message *mp;
560	int reptype;
561{
562	char namebuf[LINESIZE];
563	char linebuf[LINESIZE];
564	register char *cp, *cp2;
565	register FILE *ibuf;
566	int first = 1;
567
568	if ((cp = hfield("from", mp)) != NOSTR)
569		return cp;
570	if (reptype == 0 && (cp = hfield("sender", mp)) != NOSTR)
571		return cp;
572	ibuf = setinput(mp);
573	namebuf[0] = 0;
574	if (readline(ibuf, linebuf, LINESIZE) < 0)
575		return(savestr(namebuf));
576newname:
577	for (cp = linebuf; *cp && *cp != ' '; cp++)
578		;
579	for (; *cp == ' ' || *cp == '\t'; cp++)
580		;
581	for (cp2 = &namebuf[strlen(namebuf)];
582	     *cp && *cp != ' ' && *cp != '\t' && cp2 < namebuf + LINESIZE - 1;)
583		*cp2++ = *cp++;
584	*cp2 = '\0';
585	if (readline(ibuf, linebuf, LINESIZE) < 0)
586		return(savestr(namebuf));
587	if ((cp = index(linebuf, 'F')) == NULL)
588		return(savestr(namebuf));
589	if (strncmp(cp, "From", 4) != 0)
590		return(savestr(namebuf));
591	while ((cp = index(cp, 'r')) != NULL) {
592		if (strncmp(cp, "remote", 6) == 0) {
593			if ((cp = index(cp, 'f')) == NULL)
594				break;
595			if (strncmp(cp, "from", 4) != 0)
596				break;
597			if ((cp = index(cp, ' ')) == NULL)
598				break;
599			cp++;
600			if (first) {
601				strcpy(namebuf, cp);
602				first = 0;
603			} else
604				strcpy(rindex(namebuf, '!')+1, cp);
605			strcat(namebuf, "!");
606			goto newname;
607		}
608		cp++;
609	}
610	return(savestr(namebuf));
611}
612
613/*
614 * Count the occurances of c in str
615 */
616int
617charcount(str, c)
618	char *str;
619	int c;
620{
621	register char *cp;
622	register int i;
623
624	for (i = 0, cp = str; *cp; cp++)
625		if (*cp == c)
626			i++;
627	return(i);
628}
629
630/*
631 * Are any of the characters in the two strings the same?
632 */
633int
634anyof(s1, s2)
635	register char *s1, *s2;
636{
637
638	while (*s1)
639		if (index(s2, *s1++))
640			return 1;
641	return 0;
642}
643
644/*
645 * Convert c to upper case
646 */
647int
648raise(c)
649	register int c;
650{
651
652	if (islower(c))
653		return toupper(c);
654	return c;
655}
656
657/*
658 * Copy s1 to s2, return pointer to null in s2.
659 */
660char *
661copy(s1, s2)
662	register char *s1, *s2;
663{
664
665	while (*s2++ = *s1++)
666		;
667	return s2 - 1;
668}
669
670/*
671 * See if the given header field is supposed to be ignored.
672 */
673int
674isign(field, ignore)
675	char *field;
676	struct ignoretab ignore[2];
677{
678	char realfld[BUFSIZ];
679
680	if (ignore == ignoreall)
681		return 1;
682	/*
683	 * Lower-case the string, so that "Status" and "status"
684	 * will hash to the same place.
685	 */
686	istrcpy(realfld, field);
687	if (ignore[1].i_count > 0)
688		return (!member(realfld, ignore + 1));
689	else
690		return (member(realfld, ignore));
691}
692
693int
694member(realfield, table)
695	register char *realfield;
696	struct ignoretab *table;
697{
698	register struct ignore *igp;
699
700	for (igp = table->i_head[hash(realfield)]; igp != 0; igp = igp->i_link)
701		if (*igp->i_field == *realfield &&
702		    equal(igp->i_field, realfield))
703			return (1);
704	return (0);
705}
706