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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: aux.c,v 1.25 2009/10/27 23:59:40 deraadt Exp $	*/
/*	$NetBSD: aux.c,v 1.5 1997/05/13 06:15:52 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
 *
 * Auxiliary functions.
 */
static char *save2str(char *, char *);

/*
 * Return a pointer to a dynamic copy of the argument.
 */
char *
savestr(char *str)
{
	char *new;
	int size = strlen(str) + 1;

	if ((new = salloc(size)) != NULL)
		(void)memcpy(new, str, size);
	return(new);
}

/*
 * Make a copy of new argument incorporating old one.
 */
static char *
save2str(char *str, char *old)
{
	char *new;
	int newsize = strlen(str) + 1;
	int oldsize = old ? strlen(old) + 1 : 0;

	if ((new = salloc(newsize + oldsize)) != NULL) {
		if (oldsize) {
			(void)memcpy(new, old, oldsize);
			new[oldsize - 1] = ' ';
		}
		(void)memcpy(new + oldsize, str, newsize);
	}
	return(new);
}

/*
 * Touch the named message by setting its MTOUCH flag.
 * Touched messages have the effect of not being sent
 * back to the system mailbox on exit.
 */
void
touch(struct message *mp)
{

	mp->m_flag |= MTOUCH;
	if ((mp->m_flag & MREAD) == 0)
		mp->m_flag |= MREAD|MSTATUS;
}

/*
 * Test to see if the passed file name is a directory.
 * Return true if it is.
 */
int
isdir(char *name)
{
	struct stat sbuf;

	if (stat(name, &sbuf) < 0)
		return(0);
	return(S_ISDIR(sbuf.st_mode));
}

/*
 * Count the number of arguments in the given string raw list.
 */
int
argcount(char **argv)
{
	char **ap;

	for (ap = argv; *ap++ != NULL;)
		;	
	return(ap - argv - 1);
}

/*
 * Return the desired header line from the passed message
 * pointer (or NULL if the desired header field is not available).
 */
char *
hfield(char *field, struct message *mp)
{
	FILE *ibuf;
	char linebuf[LINESIZE];
	int lc;
	char *hfield;
	char *colon, *oldhfield = NULL;

	ibuf = setinput(mp);
	if ((lc = mp->m_lines - 1) < 0)
		return(NULL);
	if (readline(ibuf, linebuf, LINESIZE, NULL) < 0)
		return(NULL);
	while (lc > 0) {
		if ((lc = gethfield(ibuf, linebuf, lc, &colon)) < 0)
			return(oldhfield);
		if ((hfield = ishfield(linebuf, colon, field)) != NULL)
			oldhfield = save2str(hfield, oldhfield);
	}
	return(oldhfield);
}

/*
 * Return the next header field found in the given message.
 * Return >= 0 if something found, < 0 elsewise.
 * "colon" is set to point to the colon in the header.
 * Must deal with \ continuations & other such fraud.
 */
int
gethfield(FILE *f, char *linebuf, int rem, char **colon)
{
	char line2[LINESIZE];
	char *cp, *cp2;
	int c;

	for (;;) {
		if (--rem < 0)
			return(-1);
		if ((c = readline(f, linebuf, LINESIZE, NULL)) <= 0)
			return(-1);
		for (cp = linebuf; isprint(*cp) && *cp != ' ' && *cp != ':';
		     cp++)
			;
		if (*cp != ':' || cp == linebuf)
			continue;
		/*
		 * I guess we got a headline.
		 * Handle wraparounding
		 */
		*colon = cp;
		cp = linebuf + c;
		for (;;) {
			while (--cp >= linebuf && (*cp == ' ' || *cp == '\t'))
				;
			cp++;
			if (rem <= 0)
				break;
			ungetc(c = getc(f), f);
			if (c != ' ' && c != '\t')
				break;
			if ((c = readline(f, line2, LINESIZE, NULL)) < 0)
				break;
			rem--;
			for (cp2 = line2; *cp2 == ' ' || *cp2 == '\t'; cp2++)
				;
			c -= cp2 - line2;
			if (cp + c >= linebuf + LINESIZE - 2)
				break;
			*cp++ = ' ';
			(void)memcpy(cp, cp2, c);
			cp += c;
		}
		*cp = 0;
		return(rem);
	}
	/* NOTREACHED */
}

/*
 * Check whether the passed line is a header line of
 * the desired breed.  Return the field body, or 0.
 */

char*
ishfield(char *linebuf, char *colon, char *field)
{
	char *cp = colon;

	*cp = 0;
	if (strcasecmp(linebuf, field) != 0) {
		*cp = ':';
		return(0);
	}
	*cp = ':';
	for (cp++; *cp == ' ' || *cp == '\t'; cp++)
		;
	return(cp);
}

/*
 * Copy a string, lowercasing it as we go.  ``dsize'' should be
 * the real size (not len) of the dest string (guarantee NUL term).
 */
size_t
istrlcpy(char *dst, const char *src, size_t dsize)
{
	char *d = dst;
	const char *s = src;
	size_t n = dsize;

	/* Copy as many bytes as will fit */
	if (n != 0 && --n != 0) {
		do {
			if ((*d++ = tolower(*s++)) == 0)
				break;
		} while (--n != 0);
	}

	/* Not enough room in dst, add NUL and traverse rest of src */
	if (n == 0) {
		if (dsize != 0)
			*d = '\0';		/* NUL-terminate dst */
		while (*s++)
			;
	}

	return(s - src - 1);	/* count does not include NUL */
}

/*
 * The following code deals with input stacking to do source
 * commands.  All but the current file pointer are saved on
 * the stack.
 */
static	int	ssp;			/* Top of file stack */
struct sstack {
	FILE	*s_file;		/* File we were in. */
	int	s_cond;			/* Saved state of conditionals */
	int	s_loading;		/* Loading .mailrc, etc. */
} sstack[NOFILE];

/*
 * Pushdown current input file and switch to a new one.
 * Set the global flag "sourcing" so that others will realize
 * that they are no longer reading from a tty (in all probability).
 */
int
source(void *v)
{
	char **arglist = v;
	FILE *fi;
	char *cp;

	if ((cp = expand(*arglist)) == NULL)
		return(1);
	if ((fi = Fopen(cp, "r")) == NULL) {
		warn("%s", cp);
		return(1);
	}
	if (ssp >= NOFILE - 1) {
		puts("Too much \"sourcing\" going on.");
		(void)Fclose(fi);
		return(1);
	}
	sstack[ssp].s_file = input;
	sstack[ssp].s_cond = cond;
	sstack[ssp].s_loading = loading;
	ssp++;
	loading = 0;
	cond = CANY;
	input = fi;
	sourcing++;
	return(0);
}

/*
 * Pop the current input back to the previous level.
 * Update the "sourcing" flag as appropriate.
 */
int
unstack(void)
{

	if (ssp <= 0) {
		puts("\"Source\" stack over-pop.");
		sourcing = 0;
		return(1);
	}
	(void)Fclose(input);
	if (cond != CANY)
		puts("Unmatched \"if\"");
	ssp--;
	cond = sstack[ssp].s_cond;
	loading = sstack[ssp].s_loading;
	input = sstack[ssp].s_file;
	if (ssp == 0)
		sourcing = loading;
	return(0);
}

/*
 * Touch the indicated file.
 * This is nifty for the shell.
 */
void
alter(char *name)
{
	struct stat sb;
	struct timeval tv[2];

	if (stat(name, &sb))
		return;
	(void) gettimeofday(&tv[0], (struct timezone *)0);
	tv[0].tv_sec++;
#ifdef TIMESPEC_TO_TIMEVAL
	TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);
#else
	tv[1].tv_sec = sb.st_mtime;
#endif
	(void)utimes(name, tv);
}

/*
 * Examine the passed line buffer and
 * return true if it is all blanks and tabs.
 */
int
blankline(char *linebuf)
{
	char *cp;

	for (cp = linebuf; *cp; cp++)
		if (*cp != ' ' && *cp != '\t')
			return(0);
	return(1);
}

/*
 * Get sender's name from this message.  If the message has
 * a bunch of arpanet stuff in it, we may have to skin the name
 * before returning it.
 */
char *
nameof(struct message *mp, int reptype)
{
	char *cp, *cp2;

	cp = skin(name1(mp, reptype));
	if (reptype != 0 || charcount(cp, '!') < 2)
		return(cp);
	cp2 = strrchr(cp, '!');
	cp2--;
	while (cp2 > cp && *cp2 != '!')
		cp2--;
	if (*cp2 == '!')
		return(cp2 + 1);
	return(cp);
}

/*
 * Start of a "comment".
 * Ignore it.
 */
char *
skip_comment(char *cp)
{
	int nesting = 1;

	for (; nesting > 0 && *cp; cp++) {
		switch (*cp) {
		case '\\':
			if (cp[1])
				cp++;
			break;
		case '(':
			nesting++;
			break;
		case ')':
			nesting--;
			break;
		}
	}
	return(cp);
}

/*
 * Skin an arpa net address according to the RFC 822 interpretation
 * of "host-phrase."
 */
char *
skin(char *name)
{
	char *nbuf, *bufend, *cp, *cp2;
	int c, gotlt, lastsp;

	if (name == NULL)
		return(NULL);
	if (strchr(name, '(') == NULL && strchr(name, '<') == NULL
	    && strchr(name, ' ') == NULL)
		return(name);

	/* We assume that length(input) <= length(output) */
	if ((nbuf = (char *)malloc(strlen(name) + 1)) == NULL)
		errx(1, "Out of memory");
	gotlt = 0;
	lastsp = 0;
	bufend = nbuf;
	for (cp = name, cp2 = bufend; (c = *cp++) != '\0'; ) {
		switch (c) {
		case '(':
			cp = skip_comment(cp);
			lastsp = 0;
			break;

		case '"':
			/*
			 * Start of a "quoted-string".
			 * Copy it in its entirety.
			 */
			while ((c = *cp) != '\0') {
				cp++;
				if (c == '"')
					break;
				if (c != '\\')
					*cp2++ = c;
				else if ((c = *cp) != '\0') {
					*cp2++ = c;
					cp++;
				}
			}
			lastsp = 0;
			break;

		case ' ':
			if (strncmp(cp, "at ", 3) == 0)
				cp += 3, *cp2++ = '@';
			else
			if (strncmp(cp, "@ ", 2) == 0)
				cp += 2, *cp2++ = '@';
			else
				lastsp = 1;
			break;

		case '<':
			cp2 = bufend;
			gotlt++;
			lastsp = 0;
			break;

		case '>':
			if (gotlt) {
				gotlt = 0;
				while ((c = *cp) && c != ',') {
					cp++;
					if (c == '(')
						cp = skip_comment(cp);
					else if (c == '"')
						while ((c = *cp) != '\0') {
							cp++;
							if (c == '"')
								break;
							if (c == '\\' && *cp)
								cp++;
						}
				}
				lastsp = 0;
				break;
			}
			/* Fall into . . . */

		default:
			if (lastsp) {
				lastsp = 0;
				*cp2++ = ' ';
			}
			*cp2++ = c;
			if (c == ',' && *cp == ' ' && !gotlt) {
				*cp2++ = ' ';
				while (*++cp == ' ')
					;
				lastsp = 0;
				bufend = cp2;
			}
		}
	}
	*cp2 = 0;

	if ((cp = (char *)realloc(nbuf, strlen(nbuf) + 1)) != NULL)
		nbuf = cp;
	return(nbuf);
}

/*
 * Fetch the sender's name from the passed message.
 * Reptype can be
 *	0 -- get sender's name for display purposes
 *	1 -- get sender's name for reply
 *	2 -- get sender's name for Reply
 */
char *
name1(struct message *mp, int reptype)
{
	char namebuf[LINESIZE];
	char linebuf[LINESIZE];
	char *cp, *cp2;
	FILE *ibuf;
	int first = 1;

	if ((cp = hfield("from", mp)) != NULL)
		return(cp);
	if (reptype == 0 && (cp = hfield("sender", mp)) != NULL)
		return(cp);
	ibuf = setinput(mp);
	namebuf[0] = '\0';
	if (readline(ibuf, linebuf, LINESIZE, NULL) < 0)
		return(savestr(namebuf));
newname:
	for (cp = linebuf; *cp && *cp != ' '; cp++)
		;
	for (; *cp == ' ' || *cp == '\t'; cp++)
		;
	for (cp2 = &namebuf[strlen(namebuf)];
	     *cp && *cp != ' ' && *cp != '\t' && cp2 < namebuf + LINESIZE - 1;)
		*cp2++ = *cp++;
	*cp2 = '\0';
	if (readline(ibuf, linebuf, LINESIZE, NULL) < 0)
		return(savestr(namebuf));
	if ((cp = strchr(linebuf, 'F')) == NULL)
		return(savestr(namebuf));
	if (strncmp(cp, "From", 4) != 0)
		return(savestr(namebuf));
	while ((cp = strchr(cp, 'r')) != NULL) {
		if (strncmp(cp, "remote", 6) == 0) {
			if ((cp = strchr(cp, 'f')) == NULL)
				break;
			if (strncmp(cp, "from", 4) != 0)
				break;
			if ((cp = strchr(cp, ' ')) == NULL)
				break;
			cp++;
			if (first) {
				cp2 = namebuf;
				first = 0;
			} else
				cp2 = strrchr(namebuf, '!') + 1;
			strlcpy(cp2, cp, sizeof(namebuf) - (cp2 - namebuf) - 1);
			strlcat(namebuf, "!", sizeof(namebuf));
			goto newname;
		}
		cp++;
	}
	return(savestr(namebuf));
}

/*
 * Count the occurances of c in str
 */
int
charcount(char *str, int c)
{
	char *cp;
	int i;

	for (i = 0, cp = str; *cp; cp++)
		if (*cp == c)
			i++;
	return(i);
}

/*
 * Copy s1 to s2, return pointer to null in s2.
 */
char *
copy(char *s1, char *s2)
{

	while ((*s2++ = *s1++) != '\0')
		;
	return(s2 - 1);
}

/*
 * See if the given header field is supposed to be ignored.
 */
int
isign(char *field, struct ignoretab ignore[2])
{
	char realfld[LINESIZE];

	if (ignore == ignoreall)
		return(1);
	/*
	 * Lower-case the string, so that "Status" and "status"
	 * will hash to the same place.
	 */
	istrlcpy(realfld, field, sizeof(realfld));
	if (ignore[1].i_count > 0)
		return(!member(realfld, ignore + 1));
	else
		return(member(realfld, ignore));
}

int
member(char *realfield, struct ignoretab *table)
{
	struct ignore *igp;

	for (igp = table->i_head[hash(realfield)]; igp != 0; igp = igp->i_link)
		if (*igp->i_field == *realfield &&
		    equal(igp->i_field, realfield))
			return(1);
	return(0);
}

void
clearnew(void)
{
	struct message *mp;

	for (mp = &message[0]; mp < &message[msgCount]; mp++) {
		if (mp->m_flag & MNEW) {
			mp->m_flag &= ~MNEW;
			mp->m_flag |= MSTATUS;
		}
	}
}