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Changes from Don Beusee:
o escape From line with a leading '>' when needed
o only print To: address and Subject lines if actually present
o new variable 'allnet' to treat user@foo and user@bar as the same "user"
o folders command now takes an optional argument like ls.
o new "pipe" (|) command to pipe the message through an arbitrary command
o make header display format the same as SunOS 4.1.3 /usr/ucb/mail
o tilde commands work regardless of interactive mode.
o fix "read: Interrupted system call" error by retrying if EINTR
o expanded help file
Changes by me:
o read the help file via the PAGER as it is now more than 24 lines long

/*	$OpenBSD: vars.c,v 1.6 2001/01/16 05:36:09 millert Exp $	*/
/*	$NetBSD: vars.c,v 1.4 1996/06/08 19:48:45 christos 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 */

#ifndef lint
#if 0
static char sccsid[] = "@(#)vars.c	8.1 (Berkeley) 6/6/93";
#else
static char rcsid[] = "$OpenBSD: vars.c,v 1.6 2001/01/16 05:36:09 millert Exp $";
#endif
#endif /* not lint */

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

/*
 * Mail -- a mail program
 *
 * Variable handling stuff.
 */

/*
 * Assign a value to a variable.
 */
void
assign(name, value)
	char name[], value[];
{
	struct var *vp;
	int h;

	h = hash(name);
	vp = lookup(name);
	if (vp == NOVAR) {
		vp = (struct var *)calloc(sizeof(*vp), 1);
		vp->v_name = vcopy(name);
		vp->v_link = variables[h];
		variables[h] = vp;
	}
	else
		vfree(vp->v_value);
	vp->v_value = vcopy(value);
}

/*
 * Free up a variable string.  We do not bother to allocate
 * strings whose value is "" since they are expected to be frequent.
 * Thus, we cannot free same!
 */
void
vfree(cp)
	char *cp;
{
	if (*cp)
		(void)free(cp);
}

/*
 * Copy a variable value into permanent (ie, not collected after each
 * command) space.  Do not bother to alloc space for ""
 */

char *
vcopy(str)
	char str[];
{
	char *new;
	unsigned len;

	if (*str == '\0')
		return("");
	len = strlen(str) + 1;
	if ((new = (char *)malloc(len)) == NULL)
		errx(1, "Out of memory");
	(void)memcpy(new, str, len);
	return(new);
}

/*
 * Get the value of a variable and return it.
 * Look in the environment if its not available locally.
 */

char *
value(name)
	char name[];
{
	struct var *vp;
	char *env;

	if ((vp = lookup(name)) != NOVAR)
		return(vp->v_value);
	else if ((env = getenv(name)))
		return(env);
	/* not set, see if we can provide a default */
	else if (strcmp(name, "SHELL") == 0)
		return(_PATH_CSHELL);
	else if (strcmp(name, "LISTER") == 0)
		return(_PATH_LS);
	else if (strcmp(name, "PAGER") == 0)
		return(_PATH_MORE);
	else
		return(NULL);
}

/*
 * Locate a variable and return its variable
 * node.
 */

struct var *
lookup(name)
	char name[];
{
	struct var *vp;

	for (vp = variables[hash(name)]; vp != NOVAR; vp = vp->v_link)
		if (*vp->v_name == *name && equal(vp->v_name, name))
			return(vp);
	return(NOVAR);
}

/*
 * Locate a group name and return it.
 */

struct grouphead *
findgroup(name)
	char name[];
{
	struct grouphead *gh;

	for (gh = groups[hash(name)]; gh != NOGRP; gh = gh->g_link)
		if (*gh->g_name == *name && equal(gh->g_name, name))
			return(gh);
	return(NOGRP);
}

/*
 * Print a group out on stdout
 */
void
printgroup(name)
	char name[];
{
	struct grouphead *gh;
	struct group *gp;

	if ((gh = findgroup(name)) == NOGRP) {
		printf("\"%s\": not a group\n", name);
		return;
	}
	printf("%s\t", gh->g_name);
	for (gp = gh->g_list; gp != NOGE; gp = gp->ge_link)
		printf(" %s", gp->ge_name);
	putchar('\n');
}

/*
 * Hash the passed string and return an index into
 * the variable or group hash table.
 */
int
hash(name)
	char *name;
{
	int h = 0;

	while (*name) {
		h <<= 2;
		h += *name++;
	}
	if (h < 0 && (h = -h) < 0)
		h = 0;
	return(h % HSHSIZE);
}