cmd3.c revision 1.26 
1/*	$NetBSD: cmd3.c,v 1.26 2005/07/19 01:38:38 christos 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 1.26 2005/07/19 01:38:38 christos 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	const 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	const 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	const 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	const char *cp;
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 = 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		while (*cp != '=' && *cp != '\0')
386			++cp;
387		l = cp - *ap;
388		if (l >= sizeof varbuf)
389			l = sizeof varbuf - 1;
390		strncpy(varbuf, *ap, l);
391		varbuf[l] = '\0';
392		if (*cp == '\0')
393			cp = "";
394		else
395			cp++;
396		if (equal(varbuf, "")) {
397			printf("Non-null variable name required\n");
398			errs++;
399			continue;
400		}
401		assign(varbuf, cp);
402	}
403	return(errs);
404}
405
406/*
407 * Unset a bunch of variable values.
408 */
409int
410unset(void *v)
411{
412	char **arglist = v;
413	struct var *vp, *vp2;
414	int errs, h;
415	char **ap;
416
417	errs = 0;
418	for (ap = arglist; *ap != NULL; ap++) {
419		if ((vp2 = lookup(*ap)) == NULL) {
420			if (getenv(*ap)) {
421				unsetenv(*ap);
422			} else if (!sourcing) {
423				printf("\"%s\": undefined variable\n", *ap);
424				errs++;
425			}
426			continue;
427		}
428		h = hash(*ap);
429		if (vp2 == variables[h]) {
430			variables[h] = variables[h]->v_link;
431			v_free(vp2->v_name);
432                        v_free(vp2->v_value);
433			free((char *)vp2);
434			continue;
435		}
436		for (vp = variables[h]; vp->v_link != vp2; vp = vp->v_link)
437			;
438		vp->v_link = vp2->v_link;
439                v_free(vp2->v_name);
440                v_free(vp2->v_value);
441		free((char *) vp2);
442	}
443	return(errs);
444}
445
446/*
447 * Put add users to a group.
448 */
449int
450group(void *v)
451{
452	char **argv = v;
453	struct grouphead *gh;
454	struct group *gp;
455	int h;
456	int s;
457	char **ap, *gname, **p;
458
459	if (*argv == NULL) {
460		for (h = 0, s = 1; h < HSHSIZE; h++)
461			for (gh = groups[h]; gh != NULL; gh = gh->g_link)
462				s++;
463		ap = salloc(s * sizeof *ap);
464		for (h = 0, p = ap; h < HSHSIZE; h++)
465			for (gh = groups[h]; gh != NULL; gh = gh->g_link)
466				*p++ = gh->g_name;
467		*p = NULL;
468		sort(ap);
469		for (p = ap; *p != NULL; p++)
470			printgroup(*p);
471		return(0);
472	}
473	if (argv[1] == NULL) {
474		printgroup(*argv);
475		return(0);
476	}
477	gname = *argv;
478	h = hash(gname);
479	if ((gh = findgroup(gname)) == NULL) {
480		gh = (struct grouphead *) calloc(1, sizeof *gh);
481		gh->g_name = vcopy(gname);
482		gh->g_list = NULL;
483		gh->g_link = groups[h];
484		groups[h] = gh;
485	}
486
487	/*
488	 * Insert names from the command list into the group.
489	 * Who cares if there are duplicates?  They get tossed
490	 * later anyway.
491	 */
492
493	for (ap = argv+1; *ap != NULL; ap++) {
494		gp = (struct group *) calloc(1, sizeof *gp);
495		gp->ge_name = vcopy(*ap);
496		gp->ge_link = gh->g_list;
497		gh->g_list = gp;
498	}
499	return(0);
500}
501
502/*
503 * Sort the passed string vecotor into ascending dictionary
504 * order.
505 */
506void
507sort(char **list)
508{
509	char **ap;
510
511	for (ap = list; *ap != NULL; ap++)
512		;
513	if (ap-list < 2)
514		return;
515	qsort(list, ap-list, sizeof(*list), diction);
516}
517
518/*
519 * Do a dictionary order comparison of the arguments from
520 * qsort.
521 */
522static int
523diction(const void *a, const void *b)
524{
525	return(strcmp(*(const char *const *)a, *(const char *const *)b));
526}
527
528/*
529 * The do nothing command for comments.
530 */
531
532/*ARGSUSED*/
533int
534null(void *v)
535{
536	return 0;
537}
538
539/*
540 * Change to another file.  With no argument, print information about
541 * the current file.
542 */
543int
544file(void *v)
545{
546	char **argv = v;
547
548	if (argv[0] == NULL) {
549		newfileinfo(0);
550		return 0;
551	}
552	if (setfile(*argv) < 0)
553		return 1;
554	announce();
555	return 0;
556}
557
558/*
559 * Expand file names like echo
560 */
561int
562echo(void *v)
563{
564	char **argv = v;
565	char **ap;
566	const char *cp;
567
568	for (ap = argv; *ap != NULL; ap++) {
569		cp = *ap;
570		if ((cp = expand(cp)) != NULL) {
571			if (ap != argv)
572				putchar(' ');
573			printf("%s", cp);
574		}
575	}
576	putchar('\n');
577	return 0;
578}
579
580int
581Respond(void *v)
582{
583	int *msgvec = v;
584	if (value("Replyall") == NULL)
585		return (_Respond(msgvec));
586	else
587		return (_respond(msgvec));
588}
589
590/*
591 * Reply to a series of messages by simply mailing to the senders
592 * and not messing around with the To: and Cc: lists as in normal
593 * reply.
594 */
595int
596_Respond(int msgvec[])
597{
598	struct header head;
599	struct message *mp;
600	int *ap;
601	char *cp;
602
603	head.h_to = NULL;
604	for (ap = msgvec; *ap != 0; ap++) {
605		mp = &message[*ap - 1];
606		touch(mp);
607		dot = mp;
608		if ((cp = skin(hfield("from", mp))) == NULL)
609			cp = skin(nameof(mp, 2));
610		head.h_to = cat(head.h_to, extract(cp, GTO));
611	}
612	if (head.h_to == NULL)
613		return 0;
614	mp = &message[msgvec[0] - 1];
615	if ((head.h_subject = hfield("subject", mp)) == NULL)
616		head.h_subject = hfield("subj", mp);
617	head.h_subject = reedit(head.h_subject);
618	head.h_cc = NULL;
619	head.h_bcc = NULL;
620	head.h_smopts = NULL;
621	mail1(&head, 1);
622	return 0;
623}
624
625/*
626 * Conditional commands.  These allow one to parameterize one's
627 * .mailrc and do some things if sending, others if receiving.
628 */
629int
630ifcmd(void *v)
631{
632	char **argv = v;
633	char *cp;
634
635	if (cond != CANY) {
636		printf("Illegal nested \"if\"\n");
637		return(1);
638	}
639	cond = CANY;
640	cp = argv[0];
641	switch (*cp) {
642	case 'r': case 'R':
643		cond = CRCV;
644		break;
645
646	case 's': case 'S':
647		cond = CSEND;
648		break;
649
650	default:
651		printf("Unrecognized if-keyword: \"%s\"\n", cp);
652		return(1);
653	}
654	return(0);
655}
656
657/*
658 * Implement 'else'.  This is pretty simple -- we just
659 * flip over the conditional flag.
660 */
661int
662elsecmd(void *v)
663{
664
665	switch (cond) {
666	case CANY:
667		printf("\"Else\" without matching \"if\"\n");
668		return(1);
669
670	case CSEND:
671		cond = CRCV;
672		break;
673
674	case CRCV:
675		cond = CSEND;
676		break;
677
678	default:
679		printf("Mail's idea of conditions is screwed up\n");
680		cond = CANY;
681		break;
682	}
683	return(0);
684}
685
686/*
687 * End of if statement.  Just set cond back to anything.
688 */
689int
690endifcmd(void *v)
691{
692
693	if (cond == CANY) {
694		printf("\"Endif\" without matching \"if\"\n");
695		return(1);
696	}
697	cond = CANY;
698	return(0);
699}
700
701/*
702 * Set the list of alternate names.
703 */
704int
705alternates(void *v)
706{
707	char **namelist = v;
708	int c;
709	char **ap, **ap2, *cp;
710
711	c = argcount(namelist) + 1;
712	if (c == 1) {
713		if (altnames == 0)
714			return(0);
715		for (ap = altnames; *ap; ap++)
716			printf("%s ", *ap);
717		printf("\n");
718		return(0);
719	}
720	if (altnames != 0)
721		free((char *) altnames);
722	altnames = (char **) calloc((unsigned) c, sizeof (char *));
723	for (ap = namelist, ap2 = altnames; *ap; ap++, ap2++) {
724		cp = (char *) calloc((unsigned) strlen(*ap) + 1, sizeof (char));
725		strcpy(cp, *ap);
726		*ap2 = cp;
727	}
728	*ap2 = 0;
729	return(0);
730}
731