cmd3.c revision 1.24 
1/*	$NetBSD: cmd3.c,v 1.24 2003/11/10 21:37:36 ross Exp $	*/
2
3/*
4 * Copyright (c) 1980, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34#if 0
35static char sccsid[] = "@(#)cmd3.c	8.2 (Berkeley) 4/20/95";
36#else
37__RCSID("$NetBSD: cmd3.c,v 1.24 2003/11/10 21:37:36 ross Exp $");
38#endif
39#endif /* not lint */
40
41#include "rcv.h"
42#include "extern.h"
43
44/*
45 * Mail -- a mail program
46 *
47 * Still more user commands.
48 */
49static int diction(const void *, const void *);
50
51/*
52 * Process a shell escape by saving signals, ignoring signals,
53 * and forking a sh -c
54 */
55int
56shell(void *v)
57{
58	char *str = v;
59	sig_t sigint = signal(SIGINT, SIG_IGN);
60	char *shellcmd;
61	char cmd[BUFSIZ];
62
63	(void)strcpy(cmd, str);
64	if (bangexp(cmd) < 0)
65		return 1;
66	if ((shellcmd = value("SHELL")) == NULL)
67		shellcmd = _PATH_CSHELL;
68	(void)run_command(shellcmd, 0, 0, 1, "-c", cmd, NULL);
69	(void)signal(SIGINT, sigint);
70	printf("!\n");
71	return 0;
72}
73
74/*
75 * Fork an interactive shell.
76 */
77/*ARGSUSED*/
78int
79dosh(void *v)
80{
81	sig_t sigint = signal(SIGINT, SIG_IGN);
82	char *shellcmd;
83
84	if ((shellcmd = value("SHELL")) == NULL)
85		shellcmd = _PATH_CSHELL;
86	(void)run_command(shellcmd, 0, 0, 1, NULL);
87	(void)signal(SIGINT, sigint);
88	putchar('\n');
89	return 0;
90}
91
92/*
93 * Expand the shell escape by expanding unescaped !'s into the
94 * last issued command where possible.
95 */
96
97char	lastbang[128];
98
99int
100bangexp(char *str)
101{
102	char bangbuf[BUFSIZ];
103	char *cp, *cp2;
104	int n;
105	int changed = 0;
106
107	cp = str;
108	cp2 = bangbuf;
109	n = BUFSIZ;
110	while (*cp) {
111		if (*cp == '!') {
112			if (n < strlen(lastbang)) {
113overf:
114				printf("Command buffer overflow\n");
115				return(-1);
116			}
117			changed++;
118			strcpy(cp2, lastbang);
119			cp2 += strlen(lastbang);
120			n -= strlen(lastbang);
121			cp++;
122			continue;
123		}
124		if (*cp == '\\' && cp[1] == '!') {
125			if (--n <= 1)
126				goto overf;
127			*cp2++ = '!';
128			cp += 2;
129			changed++;
130		}
131		if (--n <= 1)
132			goto overf;
133		*cp2++ = *cp++;
134	}
135	*cp2 = 0;
136	if (changed) {
137		printf("!%s\n", bangbuf);
138		fflush(stdout);
139	}
140	strcpy(str, bangbuf);
141	strncpy(lastbang, bangbuf, 128);
142	lastbang[127] = 0;
143	return(0);
144}
145
146/*
147 * Print out a nice help message from some file or another.
148 */
149
150int
151help(void *v)
152{
153	int c;
154	FILE *f;
155
156	if ((f = Fopen(_PATH_HELP, "r")) == NULL) {
157		warn(_PATH_HELP);
158		return(1);
159	}
160	while ((c = getc(f)) != EOF)
161		putchar(c);
162	Fclose(f);
163	return(0);
164}
165
166/*
167 * Change user's working directory.
168 */
169int
170schdir(void *v)
171{
172	char **arglist = v;
173	char *cp;
174
175	if (*arglist == NULL)
176		cp = homedir;
177	else
178		if ((cp = expand(*arglist)) == NULL)
179			return(1);
180	if (chdir(cp) < 0) {
181		warn("%s", cp);
182		return(1);
183	}
184	return 0;
185}
186
187int
188respond(void *v)
189{
190	int *msgvec = v;
191	if (value("Replyall") == NULL)
192		return (_respond(msgvec));
193	else
194		return (_Respond(msgvec));
195}
196
197/*
198 * Reply to a list of messages.  Extract each name from the
199 * message header and send them off to mail1()
200 */
201int
202_respond(int *msgvec)
203{
204	struct message *mp;
205	char *cp, *rcv, *replyto;
206	char **ap;
207	struct name *np;
208	struct header head;
209
210	if (msgvec[1] != 0) {
211		printf("Sorry, can't reply to multiple messages at once\n");
212		return(1);
213	}
214	mp = &message[msgvec[0] - 1];
215	touch(mp);
216	dot = mp;
217	if ((rcv = skin(hfield("from", mp))) == NULL)
218		rcv = skin(nameof(mp, 1));
219	if ((replyto = skin(hfield("reply-to", mp))) != NULL)
220		np = extract(replyto, GTO);
221	else if ((cp = skin(hfield("to", mp))) != NULL)
222		np = extract(cp, GTO);
223	else
224		np = NULL;
225	np = elide(np);
226	/*
227	 * Delete my name from the reply list,
228	 * and with it, all my alternate names.
229	 */
230	np = delname(np, myname);
231	if (altnames)
232		for (ap = altnames; *ap; ap++)
233			np = delname(np, *ap);
234	if (np != NULL && replyto == NULL)
235		np = cat(np, extract(rcv, GTO));
236	else if (np == NULL) {
237		if (replyto != NULL)
238			printf("Empty reply-to field -- replying to author\n");
239		np = extract(rcv, GTO);
240	}
241	head.h_to = np;
242	if ((head.h_subject = hfield("subject", mp)) == NULL)
243		head.h_subject = hfield("subj", mp);
244	head.h_subject = reedit(head.h_subject);
245	if (replyto == NULL && (cp = skin(hfield("cc", mp))) != NULL) {
246		np = elide(extract(cp, GCC));
247		np = delname(np, myname);
248		if (altnames != 0)
249			for (ap = altnames; *ap; ap++)
250				np = delname(np, *ap);
251		head.h_cc = np;
252	} else
253		head.h_cc = NULL;
254	head.h_bcc = NULL;
255	head.h_smopts = NULL;
256	mail1(&head, 1);
257	return(0);
258}
259
260/*
261 * Modify the subject we are replying to to begin with Re: if
262 * it does not already.
263 */
264char *
265reedit(char *subj)
266{
267	char *newsubj;
268
269	if (subj == NULL)
270		return NULL;
271	if ((subj[0] == 'r' || subj[0] == 'R') &&
272	    (subj[1] == 'e' || subj[1] == 'E') &&
273	    subj[2] == ':')
274		return subj;
275	newsubj = salloc(strlen(subj) + 5);
276	strcpy(newsubj, "Re: ");
277	strcpy(newsubj + 4, subj);
278	return newsubj;
279}
280
281/*
282 * Preserve the named messages, so that they will be sent
283 * back to the system mailbox.
284 */
285int
286preserve(void *v)
287{
288	int *msgvec = v;
289	struct message *mp;
290	int *ip, mesg;
291
292	if (edit) {
293		printf("Cannot \"preserve\" in edit mode\n");
294		return(1);
295	}
296	for (ip = msgvec; *ip != 0; ip++) {
297		mesg = *ip;
298		mp = &message[mesg-1];
299		mp->m_flag |= MPRESERVE;
300		mp->m_flag &= ~MBOX;
301		dot = mp;
302	}
303	return(0);
304}
305
306/*
307 * Mark all given messages as unread.
308 */
309int
310unread(void *v)
311{
312	int *msgvec = v;
313	int *ip;
314
315	for (ip = msgvec; *ip != 0; ip++) {
316		dot = &message[*ip-1];
317		dot->m_flag &= ~(MREAD|MTOUCH);
318		dot->m_flag |= MSTATUS;
319	}
320	return(0);
321}
322
323/*
324 * Print the size of each message.
325 */
326int
327messize(void *v)
328{
329	int *msgvec = v;
330	struct message *mp;
331	int *ip, mesg;
332
333	for (ip = msgvec; *ip != 0; ip++) {
334		mesg = *ip;
335		mp = &message[mesg-1];
336		printf("%d: %ld/%ld\n", mesg, mp->m_blines, mp->m_size);
337	}
338	return(0);
339}
340
341/*
342 * Quit quickly.  If we are sourcing, just pop the input level
343 * by returning an error.
344 */
345int
346rexit(void *v)
347{
348	if (sourcing)
349		return(1);
350	exit(0);
351	/*NOTREACHED*/
352}
353
354/*
355 * Set or display a variable value.  Syntax is similar to that
356 * of csh.
357 */
358int
359set(void *v)
360{
361	char **arglist = v;
362	struct var *vp;
363	char *cp, *cp2;
364	char varbuf[BUFSIZ], **ap, **p;
365	int errs, h, s;
366	size_t l;
367
368	if (*arglist == NULL) {
369		for (h = 0, s = 1; h < HSHSIZE; h++)
370			for (vp = variables[h]; vp != NULL; vp = vp->v_link)
371				s++;
372		ap = (char **) salloc(s * sizeof *ap);
373		for (h = 0, p = ap; h < HSHSIZE; h++)
374			for (vp = variables[h]; vp != NULL; vp = vp->v_link)
375				*p++ = vp->v_name;
376		*p = NULL;
377		sort(ap);
378		for (p = ap; *p != NULL; p++)
379			printf("%s\t%s\n", *p, value(*p));
380		return(0);
381	}
382	errs = 0;
383	for (ap = arglist; *ap != NULL; ap++) {
384		cp = *ap;
385		cp2 = varbuf;
386		while (*cp != '=' && *cp != '\0')
387			++cp;
388		l = cp - *ap;
389		if (l >= sizeof varbuf)
390			l = sizeof varbuf - 1;
391		strncpy(cp2, *ap, l);
392		varbuf[l] = '\0';
393		if (*cp == '\0')
394			cp = "";
395		else
396			cp++;
397		if (equal(varbuf, "")) {
398			printf("Non-null variable name required\n");
399			errs++;
400			continue;
401		}
402		assign(varbuf, cp);
403	}
404	return(errs);
405}
406
407/*
408 * Unset a bunch of variable values.
409 */
410int
411unset(void *v)
412{
413	char **arglist = v;
414	struct var *vp, *vp2;
415	int errs, h;
416	char **ap;
417
418	errs = 0;
419	for (ap = arglist; *ap != NULL; ap++) {
420		if ((vp2 = lookup(*ap)) == NULL) {
421			if (getenv(*ap)) {
422				unsetenv(*ap);
423			} else if (!sourcing) {
424				printf("\"%s\": undefined variable\n", *ap);
425				errs++;
426			}
427			continue;
428		}
429		h = hash(*ap);
430		if (vp2 == variables[h]) {
431			variables[h] = variables[h]->v_link;
432			v_free(vp2->v_name);
433                        v_free(vp2->v_value);
434			free((char *)vp2);
435			continue;
436		}
437		for (vp = variables[h]; vp->v_link != vp2; vp = vp->v_link)
438			;
439		vp->v_link = vp2->v_link;
440                v_free(vp2->v_name);
441                v_free(vp2->v_value);
442		free((char *) vp2);
443	}
444	return(errs);
445}
446
447/*
448 * Put add users to a group.
449 */
450int
451group(void *v)
452{
453	char **argv = v;
454	struct grouphead *gh;
455	struct group *gp;
456	int h;
457	int s;
458	char **ap, *gname, **p;
459
460	if (*argv == NULL) {
461		for (h = 0, s = 1; h < HSHSIZE; h++)
462			for (gh = groups[h]; gh != NULL; gh = gh->g_link)
463				s++;
464		ap = (char **) salloc(s * sizeof *ap);
465		for (h = 0, p = ap; h < HSHSIZE; h++)
466			for (gh = groups[h]; gh != NULL; gh = gh->g_link)
467				*p++ = gh->g_name;
468		*p = NULL;
469		sort(ap);
470		for (p = ap; *p != NULL; p++)
471			printgroup(*p);
472		return(0);
473	}
474	if (argv[1] == NULL) {
475		printgroup(*argv);
476		return(0);
477	}
478	gname = *argv;
479	h = hash(gname);
480	if ((gh = findgroup(gname)) == NULL) {
481		gh = (struct grouphead *) calloc(1, sizeof *gh);
482		gh->g_name = vcopy(gname);
483		gh->g_list = NULL;
484		gh->g_link = groups[h];
485		groups[h] = gh;
486	}
487
488	/*
489	 * Insert names from the command list into the group.
490	 * Who cares if there are duplicates?  They get tossed
491	 * later anyway.
492	 */
493
494	for (ap = argv+1; *ap != NULL; ap++) {
495		gp = (struct group *) calloc(1, sizeof *gp);
496		gp->ge_name = vcopy(*ap);
497		gp->ge_link = gh->g_list;
498		gh->g_list = gp;
499	}
500	return(0);
501}
502
503/*
504 * Sort the passed string vecotor into ascending dictionary
505 * order.
506 */
507void
508sort(char **list)
509{
510	char **ap;
511
512	for (ap = list; *ap != NULL; ap++)
513		;
514	if (ap-list < 2)
515		return;
516	qsort(list, ap-list, sizeof(*list), diction);
517}
518
519/*
520 * Do a dictionary order comparison of the arguments from
521 * qsort.
522 */
523static int
524diction(const void *a, const void *b)
525{
526	return(strcmp(*(char **)a, *(char **)b));
527}
528
529/*
530 * The do nothing command for comments.
531 */
532
533/*ARGSUSED*/
534int
535null(void *v)
536{
537	return 0;
538}
539
540/*
541 * Change to another file.  With no argument, print information about
542 * the current file.
543 */
544int
545file(void *v)
546{
547	char **argv = v;
548
549	if (argv[0] == NULL) {
550		newfileinfo(0);
551		return 0;
552	}
553	if (setfile(*argv) < 0)
554		return 1;
555	announce();
556	return 0;
557}
558
559/*
560 * Expand file names like echo
561 */
562int
563echo(void *v)
564{
565	char **argv = v;
566	char **ap;
567	char *cp;
568
569	for (ap = argv; *ap != NULL; ap++) {
570		cp = *ap;
571		if ((cp = expand(cp)) != NULL) {
572			if (ap != argv)
573				putchar(' ');
574			printf("%s", cp);
575		}
576	}
577	putchar('\n');
578	return 0;
579}
580
581int
582Respond(void *v)
583{
584	int *msgvec = v;
585	if (value("Replyall") == NULL)
586		return (_Respond(msgvec));
587	else
588		return (_respond(msgvec));
589}
590
591/*
592 * Reply to a series of messages by simply mailing to the senders
593 * and not messing around with the To: and Cc: lists as in normal
594 * reply.
595 */
596int
597_Respond(int msgvec[])
598{
599	struct header head;
600	struct message *mp;
601	int *ap;
602	char *cp;
603
604	head.h_to = NULL;
605	for (ap = msgvec; *ap != 0; ap++) {
606		mp = &message[*ap - 1];
607		touch(mp);
608		dot = mp;
609		if ((cp = skin(hfield("from", mp))) == NULL)
610			cp = skin(nameof(mp, 2));
611		head.h_to = cat(head.h_to, extract(cp, GTO));
612	}
613	if (head.h_to == NULL)
614		return 0;
615	mp = &message[msgvec[0] - 1];
616	if ((head.h_subject = hfield("subject", mp)) == NULL)
617		head.h_subject = hfield("subj", mp);
618	head.h_subject = reedit(head.h_subject);
619	head.h_cc = NULL;
620	head.h_bcc = NULL;
621	head.h_smopts = NULL;
622	mail1(&head, 1);
623	return 0;
624}
625
626/*
627 * Conditional commands.  These allow one to parameterize one's
628 * .mailrc and do some things if sending, others if receiving.
629 */
630int
631ifcmd(void *v)
632{
633	char **argv = v;
634	char *cp;
635
636	if (cond != CANY) {
637		printf("Illegal nested \"if\"\n");
638		return(1);
639	}
640	cond = CANY;
641	cp = argv[0];
642	switch (*cp) {
643	case 'r': case 'R':
644		cond = CRCV;
645		break;
646
647	case 's': case 'S':
648		cond = CSEND;
649		break;
650
651	default:
652		printf("Unrecognized if-keyword: \"%s\"\n", cp);
653		return(1);
654	}
655	return(0);
656}
657
658/*
659 * Implement 'else'.  This is pretty simple -- we just
660 * flip over the conditional flag.
661 */
662int
663elsecmd(void *v)
664{
665
666	switch (cond) {
667	case CANY:
668		printf("\"Else\" without matching \"if\"\n");
669		return(1);
670
671	case CSEND:
672		cond = CRCV;
673		break;
674
675	case CRCV:
676		cond = CSEND;
677		break;
678
679	default:
680		printf("Mail's idea of conditions is screwed up\n");
681		cond = CANY;
682		break;
683	}
684	return(0);
685}
686
687/*
688 * End of if statement.  Just set cond back to anything.
689 */
690int
691endifcmd(void *v)
692{
693
694	if (cond == CANY) {
695		printf("\"Endif\" without matching \"if\"\n");
696		return(1);
697	}
698	cond = CANY;
699	return(0);
700}
701
702/*
703 * Set the list of alternate names.
704 */
705int
706alternates(void *v)
707{
708	char **namelist = v;
709	int c;
710	char **ap, **ap2, *cp;
711
712	c = argcount(namelist) + 1;
713	if (c == 1) {
714		if (altnames == 0)
715			return(0);
716		for (ap = altnames; *ap; ap++)
717			printf("%s ", *ap);
718		printf("\n");
719		return(0);
720	}
721	if (altnames != 0)
722		free((char *) altnames);
723	altnames = (char **) calloc((unsigned) c, sizeof (char *));
724	for (ap = namelist, ap2 = altnames; *ap; ap++, ap2++) {
725		cp = (char *) calloc((unsigned) strlen(*ap) + 1, sizeof (char));
726		strcpy(cp, *ap);
727		*ap2 = cp;
728	}
729	*ap2 = 0;
730	return(0);
731}
732