util.c revision 18532 
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};
299#define	SSTACK_SIZE	64		/* XXX was NOFILE. */
300static struct sstack sstack[SSTACK_SIZE];
301
302/*
303 * Pushdown current input file and switch to a new one.
304 * Set the global flag "sourcing" so that others will realize
305 * that they are no longer reading from a tty (in all probability).
306 */
307int
308source(arglist)
309	char **arglist;
310{
311	FILE *fi;
312	char *cp;
313
314	if ((cp = expand(*arglist)) == NOSTR)
315		return(1);
316	if ((fi = Fopen(cp, "r")) == NULL) {
317		perror(cp);
318		return(1);
319	}
320	if (ssp >= SSTACK_SIZE - 1) {
321		printf("Too much \"sourcing\" going on.\n");
322		Fclose(fi);
323		return(1);
324	}
325	sstack[ssp].s_file = input;
326	sstack[ssp].s_cond = cond;
327	sstack[ssp].s_loading = loading;
328	ssp++;
329	loading = 0;
330	cond = CANY;
331	input = fi;
332	sourcing++;
333	return(0);
334}
335
336/*
337 * Pop the current input back to the previous level.
338 * Update the "sourcing" flag as appropriate.
339 */
340int
341unstack()
342{
343	if (ssp <= 0) {
344		printf("\"Source\" stack over-pop.\n");
345		sourcing = 0;
346		return(1);
347	}
348	Fclose(input);
349	if (cond != CANY)
350		printf("Unmatched \"if\"\n");
351	ssp--;
352	cond = sstack[ssp].s_cond;
353	loading = sstack[ssp].s_loading;
354	input = sstack[ssp].s_file;
355	if (ssp == 0)
356		sourcing = loading;
357	return(0);
358}
359
360/*
361 * Touch the indicated file.
362 * This is nifty for the shell.
363 */
364void
365alter(name)
366	char *name;
367{
368	struct stat sb;
369	struct timeval tv[2];
370	time_t time();
371
372	if (stat(name, &sb))
373		return;
374	tv[0].tv_sec = time((time_t *)0) + 1;
375	tv[1].tv_sec = sb.st_mtime;
376	tv[0].tv_usec = tv[1].tv_usec = 0;
377	(void)utimes(name, tv);
378}
379
380/*
381 * Examine the passed line buffer and
382 * return true if it is all blanks and tabs.
383 */
384int
385blankline(linebuf)
386	char linebuf[];
387{
388	register char *cp;
389
390	for (cp = linebuf; *cp; cp++)
391		if (*cp != ' ' && *cp != '\t')
392			return(0);
393	return(1);
394}
395
396/*
397 * Get sender's name from this message.  If the message has
398 * a bunch of arpanet stuff in it, we may have to skin the name
399 * before returning it.
400 */
401char *
402nameof(mp, reptype)
403	register struct message *mp;
404	int reptype;
405{
406	register char *cp, *cp2;
407
408	cp = skin(name1(mp, reptype));
409	if (reptype != 0 || charcount(cp, '!') < 2)
410		return(cp);
411	cp2 = rindex(cp, '!');
412	cp2--;
413	while (cp2 > cp && *cp2 != '!')
414		cp2--;
415	if (*cp2 == '!')
416		return(cp2 + 1);
417	return(cp);
418}
419
420/*
421 * Start of a "comment".
422 * Ignore it.
423 */
424char *
425skip_comment(cp)
426	register char *cp;
427{
428	register nesting = 1;
429
430	for (; nesting > 0 && *cp; cp++) {
431		switch (*cp) {
432		case '\\':
433			if (cp[1])
434				cp++;
435			break;
436		case '(':
437			nesting++;
438			break;
439		case ')':
440			nesting--;
441			break;
442		}
443	}
444	return cp;
445}
446
447/*
448 * Skin an arpa net address according to the RFC 822 interpretation
449 * of "host-phrase."
450 */
451char *
452skin(name)
453	char *name;
454{
455	register int c;
456	register char *cp, *cp2;
457	char *bufend;
458	int gotlt, lastsp;
459	char nbuf[BUFSIZ];
460
461	if (name == NOSTR)
462		return(NOSTR);
463	if (index(name, '(') == NOSTR && index(name, '<') == NOSTR
464	    && index(name, ' ') == NOSTR)
465		return(name);
466	gotlt = 0;
467	lastsp = 0;
468	bufend = nbuf;
469	for (cp = name, cp2 = bufend; c = *cp++; ) {
470		switch (c) {
471		case '(':
472			cp = skip_comment(cp);
473			lastsp = 0;
474			break;
475
476		case '"':
477			/*
478			 * Start of a "quoted-string".
479			 * Copy it in its entirety.
480			 */
481			while (c = *cp) {
482				cp++;
483				if (c == '"')
484					break;
485				if (c != '\\')
486					*cp2++ = c;
487				else if (c = *cp) {
488					*cp2++ = c;
489					cp++;
490				}
491			}
492			lastsp = 0;
493			break;
494
495		case ' ':
496			if (cp[0] == 'a' && cp[1] == 't' && cp[2] == ' ')
497				cp += 3, *cp2++ = '@';
498			else
499			if (cp[0] == '@' && cp[1] == ' ')
500				cp += 2, *cp2++ = '@';
501			else
502				lastsp = 1;
503			break;
504
505		case '<':
506			cp2 = bufend;
507			gotlt++;
508			lastsp = 0;
509			break;
510
511		case '>':
512			if (gotlt) {
513				gotlt = 0;
514				while ((c = *cp) && c != ',') {
515					cp++;
516					if (c == '(')
517						cp = skip_comment(cp);
518					else if (c == '"')
519						while (c = *cp) {
520							cp++;
521							if (c == '"')
522								break;
523							if (c == '\\' && *cp)
524								cp++;
525						}
526				}
527				lastsp = 0;
528				break;
529			}
530			/* Fall into . . . */
531
532		default:
533			if (lastsp) {
534				lastsp = 0;
535				*cp2++ = ' ';
536			}
537			*cp2++ = c;
538			if (c == ',' && !gotlt) {
539				*cp2++ = ' ';
540				for (; *cp == ' '; cp++)
541					;
542				lastsp = 0;
543				bufend = cp2;
544			}
545		}
546	}
547	*cp2 = 0;
548
549	return(savestr(nbuf));
550}
551
552/*
553 * Fetch the sender's name from the passed message.
554 * Reptype can be
555 *	0 -- get sender's name for display purposes
556 *	1 -- get sender's name for reply
557 *	2 -- get sender's name for Reply
558 */
559char *
560name1(mp, reptype)
561	register struct message *mp;
562	int reptype;
563{
564	char namebuf[LINESIZE];
565	char linebuf[LINESIZE];
566	register char *cp, *cp2;
567	register FILE *ibuf;
568	int first = 1;
569
570	if ((cp = hfield("from", mp)) != NOSTR)
571		return cp;
572	if (reptype == 0 && (cp = hfield("sender", mp)) != NOSTR)
573		return cp;
574	ibuf = setinput(mp);
575	namebuf[0] = 0;
576	if (readline(ibuf, linebuf, LINESIZE) < 0)
577		return(savestr(namebuf));
578newname:
579	for (cp = linebuf; *cp && *cp != ' '; cp++)
580		;
581	for (; *cp == ' ' || *cp == '\t'; cp++)
582		;
583	for (cp2 = &namebuf[strlen(namebuf)];
584	     *cp && *cp != ' ' && *cp != '\t' && cp2 < namebuf + LINESIZE - 1;)
585		*cp2++ = *cp++;
586	*cp2 = '\0';
587	if (readline(ibuf, linebuf, LINESIZE) < 0)
588		return(savestr(namebuf));
589	if ((cp = index(linebuf, 'F')) == NULL)
590		return(savestr(namebuf));
591	if (strncmp(cp, "From", 4) != 0)
592		return(savestr(namebuf));
593	while ((cp = index(cp, 'r')) != NULL) {
594		if (strncmp(cp, "remote", 6) == 0) {
595			if ((cp = index(cp, 'f')) == NULL)
596				break;
597			if (strncmp(cp, "from", 4) != 0)
598				break;
599			if ((cp = index(cp, ' ')) == NULL)
600				break;
601			cp++;
602			if (first) {
603				strcpy(namebuf, cp);
604				first = 0;
605			} else
606				strcpy(rindex(namebuf, '!')+1, cp);
607			strcat(namebuf, "!");
608			goto newname;
609		}
610		cp++;
611	}
612	return(savestr(namebuf));
613}
614
615/*
616 * Count the occurances of c in str
617 */
618int
619charcount(str, c)
620	char *str;
621	int c;
622{
623	register char *cp;
624	register int i;
625
626	for (i = 0, cp = str; *cp; cp++)
627		if (*cp == c)
628			i++;
629	return(i);
630}
631
632/*
633 * Are any of the characters in the two strings the same?
634 */
635int
636anyof(s1, s2)
637	register char *s1, *s2;
638{
639
640	while (*s1)
641		if (index(s2, *s1++))
642			return 1;
643	return 0;
644}
645
646/*
647 * Convert c to upper case
648 */
649int
650raise(c)
651	register int c;
652{
653
654	if (islower(c))
655		return toupper(c);
656	return c;
657}
658
659/*
660 * Copy s1 to s2, return pointer to null in s2.
661 */
662char *
663copy(s1, s2)
664	register char *s1, *s2;
665{
666
667	while (*s2++ = *s1++)
668		;
669	return s2 - 1;
670}
671
672/*
673 * See if the given header field is supposed to be ignored.
674 */
675int
676isign(field, ignore)
677	char *field;
678	struct ignoretab ignore[2];
679{
680	char realfld[BUFSIZ];
681
682	if (ignore == ignoreall)
683		return 1;
684	/*
685	 * Lower-case the string, so that "Status" and "status"
686	 * will hash to the same place.
687	 */
688	istrcpy(realfld, field);
689	if (ignore[1].i_count > 0)
690		return (!member(realfld, ignore + 1));
691	else
692		return (member(realfld, ignore));
693}
694
695int
696member(realfield, table)
697	register char *realfield;
698	struct ignoretab *table;
699{
700	register struct ignore *igp;
701
702	for (igp = table->i_head[hash(realfield)]; igp != 0; igp = igp->i_link)
703		if (*igp->i_field == *realfield &&
704		    equal(igp->i_field, realfield))
705			return (1);
706	return (0);
707}
708