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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: cmd3.c,v 1.24 2009/10/27 23:59:40 deraadt Exp $	*/
/*	$NetBSD: cmd3.c,v 1.8 1997/07/09 05:29:49 mikel Exp $	*/

/*
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "rcv.h"
#include "extern.h"

/*
 * Mail -- a mail program
 *
 * Still more user commands.
 */
static int diction(const void *, const void *);

/*
 * Process a shell escape by saving signals, ignoring signals,
 * and forking a sh -c
 */
int
shell(void *v)
{
	char *str = v;
	char *shell;
	char cmd[BUFSIZ];
	struct sigaction oact;
	sigset_t oset;

	(void)ignoresig(SIGINT, &oact, &oset);
	(void)strlcpy(cmd, str, sizeof(cmd));
	if (bangexp(cmd, sizeof(cmd)) < 0)
		return(1);
	shell = value("SHELL");
	(void)run_command(shell, 0, 0, -1, "-c", cmd, NULL);
	(void)sigprocmask(SIG_SETMASK, &oset, NULL);
	(void)sigaction(SIGINT, &oact, NULL);
	puts("!");
	return(0);
}

/*
 * Fork an interactive shell.
 */
/*ARGSUSED*/
int
dosh(void *v)
{
	char *shell;
	struct sigaction oact;
	sigset_t oset;

	shell = value("SHELL");
	(void)ignoresig(SIGINT, &oact, &oset);
	(void)run_command(shell, 0, 0, -1, NULL, NULL, NULL);
	(void)sigprocmask(SIG_SETMASK, &oset, NULL);
	(void)sigaction(SIGINT, &oact, NULL);
	putchar('\n');
	return(0);
}

/*
 * Expand the shell escape by expanding unescaped !'s into the
 * last issued command where possible.
 */
int
bangexp(char *str, size_t strsize)
{
	char bangbuf[BUFSIZ];
	static char lastbang[BUFSIZ];
	char *cp, *cp2;
	int n, changed = 0;

	cp = str;
	cp2 = bangbuf;
	n = BUFSIZ;
	while (*cp) {
		if (*cp == '!') {
			if (n < strlen(lastbang)) {
overf:
				puts("Command buffer overflow");
				return(-1);
			}
			changed++;
			strlcpy(cp2, lastbang, sizeof(bangbuf) - (cp2 - bangbuf));
			cp2 += strlen(lastbang);
			n -= strlen(lastbang);
			cp++;
			continue;
		}
		if (*cp == '\\' && cp[1] == '!') {
			if (--n <= 1)
				goto overf;
			*cp2++ = '!';
			cp += 2;
			changed++;
		}
		if (--n <= 1)
			goto overf;
		*cp2++ = *cp++;
	}
	*cp2 = 0;
	if (changed) {
		(void)printf("!%s\n", bangbuf);
		(void)fflush(stdout);
	}
	(void)strlcpy(str, bangbuf, strsize);
	(void)strlcpy(lastbang, bangbuf, sizeof(lastbang));
	return(0);
}

/*
 * Print out a nice help message from some file or another.
 */
int
help(void *v)
{

	(void)run_command(value("PAGER"), 0, -1, -1, _PATH_HELP, NULL);
	return(0);
}

/*
 * Change user's working directory.
 */
int
schdir(void *v)
{
	char **arglist = v;
	char *cp;

	if (*arglist == NULL) {
		if (homedir == NULL)
			return(1);
		cp = homedir;
	} else {
		if ((cp = expand(*arglist)) == NULL)
			return(1);
	}
	if (chdir(cp) < 0) {
		warn("%s", cp);
		return(1);
	}
	return(0);
}

int
respond(void *v)
{
	int *msgvec = v;

	if (value("Replyall") == NULL)
		return(_respond(msgvec));
	else
		return(_Respond(msgvec));
}

/*
 * Reply to a list of messages.  Extract each name from the
 * message header and send them off to mail1()
 */
int
_respond(msgvec)
	int *msgvec;
{
	struct message *mp;
	char *cp, *rcv, *replyto;
	char **ap;
	struct name *np;
	struct header head;

	if (msgvec[1] != 0) {
		puts("Sorry, can't reply to multiple messages at once");
		return(1);
	}
	mp = &message[msgvec[0] - 1];
	touch(mp);
	dot = mp;
	if ((rcv = skin(hfield("from", mp))) == NULL)
		rcv = skin(nameof(mp, 1));
	if ((replyto = skin(hfield("reply-to", mp))) != NULL)
		np = extract(replyto, GTO);
	else if ((cp = skin(hfield("to", mp))) != NULL)
		np = extract(cp, GTO);
	else
		np = NULL;
	/*
	 * Delete my name from the reply list,
	 * and with it, all my alternate names.
	 */
	np = delname(np, myname);
	if (altnames)
		for (ap = altnames; *ap; ap++)
			np = delname(np, *ap);
	if (np != NULL && replyto == NULL)
		np = cat(np, extract(rcv, GTO));
	else if (np == NULL) {
		if (replyto != NULL)
			puts("Empty reply-to field -- replying to author");
		np = extract(rcv, GTO);
	}
	np = elide(np);
	head.h_to = np;
	if ((head.h_subject = hfield("subject", mp)) == NULL)
		head.h_subject = hfield("subj", mp);
	head.h_subject = reedit(head.h_subject);
	if (replyto == NULL && (cp = skin(hfield("cc", mp))) != NULL) {
		np = elide(extract(cp, GCC));
		np = delname(np, myname);
		if (altnames != 0)
			for (ap = altnames; *ap; ap++)
				np = delname(np, *ap);
		head.h_cc = np;
	} else
		head.h_cc = NULL;
	head.h_bcc = NULL;
	head.h_smopts = NULL;
	mail1(&head, 1);
	return(0);
}

/*
 * Modify the subject we are replying to to begin with Re: if
 * it does not already.
 */
char *
reedit(char *subj)
{
	char *newsubj;
	size_t len;

	if (subj == NULL)
		return(NULL);
	if (strncasecmp(subj, "re:", 3) == 0)
		return(subj);
	len = strlen(subj) + 5;
	newsubj = salloc(len);
	strlcpy(newsubj, "Re: ", len);
	strlcat(newsubj, subj, len);
	return(newsubj);
}

/*
 * Mark new the named messages, so that they will be left in the system
 * mailbox as unread.
 */
int
marknew(void *v)
{
	int *msgvec = v;
	int *ip;

	for (ip = msgvec; *ip != NULL; ip++) {
		dot = &message[*ip-1];
		dot->m_flag &= ~(MBOX|MREAD|MTOUCH);
		dot->m_flag |= MNEW|MSTATUS;
	}
	return(0);
}

/*
 * Preserve the named messages, so that they will be sent
 * back to the system mailbox.
 */
int
preserve(void *v)
{
	int *msgvec = v;
	int *ip, mesg;
	struct message *mp;

	if (edit) {
		puts("Cannot \"preserve\" in edit mode");
		return(1);
	}
	for (ip = msgvec; *ip != NULL; ip++) {
		mesg = *ip;
		mp = &message[mesg-1];
		mp->m_flag |= MPRESERVE;
		mp->m_flag &= ~MBOX;
		dot = mp;
	}
	return(0);
}

/*
 * Mark all given messages as unread.
 */
int
unread(void *v)
{
	int *msgvec = v;
	int *ip;

	for (ip = msgvec; *ip != NULL; ip++) {
		dot = &message[*ip-1];
		dot->m_flag &= ~(MREAD|MTOUCH);
		dot->m_flag |= MSTATUS;
	}
	return(0);
}

/*
 * Print the size of each message.
 */
int
messize(void *v)
{
	int *msgvec = v;
	struct message *mp;
	int *ip, mesg;

	for (ip = msgvec; *ip != NULL; ip++) {
		mesg = *ip;
		mp = &message[mesg-1];
		printf("%d: %d/%d\n", mesg, mp->m_lines, mp->m_size);
	}
	return(0);
}

/*
 * Quit quickly.  If we are sourcing, just pop the input level
 * by returning an error.
 */
int
rexit(void *v)
{

	if (sourcing)
		return(1);
	exit(0);
	/*NOTREACHED*/
}

/*
 * Set or display a variable value.  Syntax is similar to that
 * of csh.
 */
int
set(void *v)
{
	char **arglist = v;
	struct var *vp;
	char *cp, *cp2;
	char varbuf[BUFSIZ], **ap, **p;
	int errs, h, s;

	if (*arglist == NULL) {
		for (h = 0, s = 1; h < HSHSIZE; h++)
			for (vp = variables[h]; vp != NULL; vp = vp->v_link)
				s++;
		ap = (char **)salloc(s * sizeof(*ap));
		for (h = 0, p = ap; h < HSHSIZE; h++)
			for (vp = variables[h]; vp != NULL; vp = vp->v_link)
				*p++ = vp->v_name;
		*p = NULL;
		sort(ap);
		for (p = ap; *p != NULL; p++)
			printf("%s\t%s\n", *p, value(*p));
		return(0);
	}
	errs = 0;
	for (ap = arglist; *ap != NULL; ap++) {
		cp = *ap;
		cp2 = varbuf;
		while (*cp != '=' && *cp != '\0')
			*cp2++ = *cp++;
		*cp2 = '\0';
		if (*cp == '\0')
			cp = "";
		else
			cp++;
		if (equal(varbuf, "")) {
			puts("Non-null variable name required");
			errs++;
			continue;
		}
		assign(varbuf, cp);
	}
	return(errs);
}

/*
 * Unset a bunch of variable values.
 */
int
unset(void *v)
{
	char **arglist = v;
	struct var *vp, *vp2;
	int errs, h;
	char **ap;

	errs = 0;
	for (ap = arglist; *ap != NULL; ap++) {
		if ((vp2 = lookup(*ap)) == NULL) {
			if (!sourcing) {
				printf("\"%s\": undefined variable\n", *ap);
				errs++;
			}
			continue;
		}
		h = hash(*ap);
		if (vp2 == variables[h]) {
			variables[h] = variables[h]->v_link;
			vfree(vp2->v_name);
			vfree(vp2->v_value);
			(void)free(vp2);
			continue;
		}
		for (vp = variables[h]; vp->v_link != vp2; vp = vp->v_link)
			;
		vp->v_link = vp2->v_link;
		vfree(vp2->v_name);
		vfree(vp2->v_value);
		(void)free(vp2);
	}
	return(errs);
}

/*
 * Put add users to a group.
 */
int
group(void *v)
{
	char **argv = v;
	struct grouphead *gh;
	struct group *gp;
	char **ap, *gname, **p;
	int h, s;

	if (*argv == NULL) {
		for (h = 0, s = 1; h < HSHSIZE; h++)
			for (gh = groups[h]; gh != NULL; gh = gh->g_link)
				s++;
		ap = (char **)salloc(s * sizeof(*ap));
		for (h = 0, p = ap; h < HSHSIZE; h++)
			for (gh = groups[h]; gh != NULL; gh = gh->g_link)
				*p++ = gh->g_name;
		*p = NULL;
		sort(ap);
		for (p = ap; *p != NULL; p++)
			printgroup(*p);
		return(0);
	}
	if (argv[1] == NULL) {
		printgroup(*argv);
		return(0);
	}
	gname = *argv;
	h = hash(gname);
	if ((gh = findgroup(gname)) == NULL) {
		if ((gh = (struct grouphead *)calloc(1, sizeof(*gh))) == NULL)
			errx(1, "Out of memory");
		gh->g_name = vcopy(gname);
		gh->g_list = NULL;
		gh->g_link = groups[h];
		groups[h] = gh;
	}

	/*
	 * Insert names from the command list into the group.
	 * Who cares if there are duplicates?  They get tossed
	 * later anyway.
	 */

	for (ap = argv+1; *ap != NULL; ap++) {
		if ((gp = (struct group *)calloc(1, sizeof(*gp))) == NULL)
			errx(1, "Out of memory");
		gp->ge_name = vcopy(*ap);
		gp->ge_link = gh->g_list;
		gh->g_list = gp;
	}
	return(0);
}

/*
 * Sort the passed string vector into ascending dictionary
 * order.
 */
void
sort(char **list)
{
	char **ap;

	for (ap = list; *ap != NULL; ap++)
		;
	if (ap-list < 2)
		return;
	qsort(list, ap-list, sizeof(*list), diction);
}

/*
 * Do a dictionary order comparison of the arguments from
 * qsort.
 */
static int
diction(const void *a, const void *b)
{

	return(strcmp(*(char **)a, *(char **)b));
}

/*
 * The do nothing command for comments.
 */
/*ARGSUSED*/
int
null(void *v)
{

	return(0);
}

/*
 * Change to another file.  With no argument, print information about
 * the current file.
 */
int
file(void *v)
{
	char **argv = v;

	if (argv[0] == NULL) {
		newfileinfo(0);
		clearnew();
		return(0);
	}
	if (setfile(*argv) < 0)
		return(1);
	announce();
	return(0);
}

/*
 * Expand file names like echo
 */
int
echo(void *v)
{
	char **argv = v;
	char **ap, *cp;

	for (ap = argv; *ap != NULL; ap++) {
		cp = *ap;
		if ((cp = expand(cp)) != NULL) {
			if (ap != argv)
				putchar(' ');
			fputs(cp, stdout);
		}
	}
	putchar('\n');
	return(0);
}

int
Respond(void *v)
{
	int *msgvec = v;

	if (value("Replyall") == NULL)
		return(_Respond(msgvec));
	else
		return(_respond(msgvec));
}

/*
 * Reply to a series of messages by simply mailing to the senders
 * and not messing around with the To: and Cc: lists as in normal
 * reply.
 */
int
_Respond(int *msgvec)
{
	struct header head;
	struct message *mp;
	int *ap;
	char *cp;

	head.h_to = NULL;
	for (ap = msgvec; *ap != 0; ap++) {
		mp = &message[*ap - 1];
		touch(mp);
		dot = mp;
		if ((cp = skin(hfield("from", mp))) == NULL)
			cp = skin(nameof(mp, 2));
		head.h_to = cat(head.h_to, extract(cp, GTO));
	}
	if (head.h_to == NULL)
		return(0);
	mp = &message[msgvec[0] - 1];
	if ((head.h_subject = hfield("subject", mp)) == NULL)
		head.h_subject = hfield("subj", mp);
	head.h_subject = reedit(head.h_subject);
	head.h_cc = NULL;
	head.h_bcc = NULL;
	head.h_smopts = NULL;
	mail1(&head, 1);
	return(0);
}

/*
 * Conditional commands.  These allow one to parameterize one's
 * .mailrc and do some things if sending, others if receiving.
 */
int
ifcmd(void *v)
{
	char **argv = v;
	char *cp;

	if (cond != CANY) {
		puts("Illegal nested \"if\"");
		return(1);
	}
	cond = CANY;
	cp = argv[0];
	switch (*cp) {
	case 'r': case 'R':
		cond = CRCV;
		break;

	case 's': case 'S':
		cond = CSEND;
		break;

	default:
		printf("Unrecognized if-keyword: \"%s\"\n", cp);
		return(1);
	}
	return(0);
}

/*
 * Implement 'else'.  This is pretty simple -- we just
 * flip over the conditional flag.
 */
int
elsecmd(void *v)
{

	switch (cond) {
	case CANY:
		puts("\"Else\" without matching \"if\"");
		return(1);

	case CSEND:
		cond = CRCV;
		break;

	case CRCV:
		cond = CSEND;
		break;

	default:
		puts("mail's idea of conditions is screwed up");
		cond = CANY;
		break;
	}
	return(0);
}

/*
 * End of if statement.  Just set cond back to anything.
 */
int
endifcmd(void *v)
{

	if (cond == CANY) {
		puts("\"Endif\" without matching \"if\"");
		return(1);
	}
	cond = CANY;
	return(0);
}

/*
 * Set the list of alternate names.
 */
int
alternates(void *v)
{
	char **namelist = v;
	char **ap, **ap2;
	int c;

	c = argcount(namelist) + 1;
	if (c == 1) {
		if (altnames == 0)
			return(0);
		for (ap = altnames; *ap; ap++)
			printf("%s ", *ap);
		putchar('\n');
		return(0);
	}
	if (altnames != 0)
		(void)free(altnames);
	if ((altnames = (char **)calloc(c, sizeof(char *))) == NULL)
		errx(1, "Out of memory");
	for (ap = namelist, ap2 = altnames; *ap; ap++, ap2++) {
		if ((*ap2 = strdup(*ap)) == NULL)
			errx(1, "Out of memory");
	}
	*ap2 = 0;
	return(0);
}