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/* $OpenBSD: head.c,v 1.7 2001/11/21 15:26:39 millert Exp $ */
/* $NetBSD: head.c,v 1.6 1996/12/28 07:11:03 tls 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 const char sccsid[] = "@(#)head.c 8.2 (Berkeley) 4/20/95";
#else
static const char rcsid[] = "$OpenBSD: head.c,v 1.7 2001/11/21 15:26:39 millert Exp $";
#endif
#endif /* not lint */
#include "rcv.h"
#include "extern.h"
/*
* Mail -- a mail program
*
* Routines for processing and detecting headlines.
*/
/*
* See if the passed line buffer is a mail header.
* Return true if yes. Note the extreme pains to
* accomodate all funny formats.
*/
int
ishead(char *linebuf)
{
char *cp;
struct headline hl;
char parbuf[BUFSIZ];
cp = linebuf;
if (*cp++ != 'F' || *cp++ != 'r' || *cp++ != 'o' || *cp++ != 'm' ||
*cp++ != ' ')
return(0);
parse(linebuf, &hl, parbuf);
if (hl.l_from == NULL || hl.l_date == NULL) {
fail(linebuf, "No from or date field");
return(0);
}
if (!isdate(hl.l_date)) {
fail(linebuf, "Date field not legal date");
return(0);
}
/*
* I guess we got it!
*/
return(1);
}
/*ARGSUSED*/
void
fail(char *linebuf, char *reason)
{
/*
if (value("debug") == NULL)
return;
fprintf(stderr, "\"%s\"\nnot a header because %s\n", linebuf, reason);
*/
}
/*
* Split a headline into its useful components.
* Copy the line into dynamic string space, then set
* pointers into the copied line in the passed headline
* structure. Actually, it scans.
*/
void
parse(char *line, struct headline *hl, char *pbuf)
{
char *cp, *sp;
char word[LINESIZE];
hl->l_from = NULL;
hl->l_tty = NULL;
hl->l_date = NULL;
cp = line;
sp = pbuf;
/*
* Skip over "From" first.
*/
cp = nextword(cp, word);
cp = nextword(cp, word);
if (*word)
hl->l_from = copyin(word, &sp);
if (cp != NULL && cp[0] == 't' && cp[1] == 't' && cp[2] == 'y') {
cp = nextword(cp, word);
hl->l_tty = copyin(word, &sp);
}
if (cp != NULL)
hl->l_date = copyin(cp, &sp);
}
/*
* Copy the string on the left into the string on the right
* and bump the right (reference) string pointer by the length.
* Thus, dynamically allocate space in the right string, copying
* the left string into it.
*/
char *
copyin(char *src, char **space)
{
char *cp, *top;
top = cp = *space;
while ((*cp++ = *src++) != '\0')
;
*space = cp;
return(top);
}
/*
* Test to see if the passed string is a ctime(3) generated
* date string as documented in the manual. The template
* below is used as the criterion of correctness.
* Also, we check for a possible trailing time zone using
* the tmztype template.
*/
/*
* 'A' An upper case char
* 'a' A lower case char
* ' ' A space
* '0' A digit
* 'O' A digit or space
* 'p' A punctuation char
* 'P' A punctuation char or space
* ':' A colon
* 'N' A new line
*/
/*
* Yuck. If the mail file is created by Sys V (Solaris),
* there are no seconds in the time...
*/
/*
* If the mail is created by another program such as imapd, it might
* have timezone as <-|+>nnnn (-0800 for instance) at the end.
*/
static char *date_formats[] = {
"Aaa Aaa O0 00:00:00 0000", /* Mon Jan 01 23:59:59 2001 */
"Aaa Aaa O0 00:00:00 AAA 0000", /* Mon Jan 01 23:59:59 PST 2001 */
"Aaa Aaa O0 00:00:00 0000 p0000", /* Mon Jan 01 23:59:59 2001 -0800 */
"Aaa Aaa O0 00:00 0000", /* Mon Jan 01 23:59 2001 */
"Aaa Aaa O0 00:00 AAA 0000", /* Mon Jan 01 23:59 PST 2001 */
"Aaa Aaa O0 00:00 0000 p0000", /* Mon Jan 01 23:59 2001 -0800 */
""
};
int
isdate(char *date)
{
int i;
for(i = 0; *date_formats[i]; i++) {
if (cmatch(date, date_formats[i]))
return 1;
}
return 0;
}
/*
* Match the given string (cp) against the given template (tp).
* Return 1 if they match, 0 if they don't
*/
int
cmatch(char *cp, char *tp)
{
while (*cp && *tp)
switch (*tp++) {
case 'a':
if (!islower(*cp++))
return(0);
break;
case 'A':
if (!isupper(*cp++))
return(0);
break;
case ' ':
if (*cp++ != ' ')
return(0);
break;
case '0':
if (!isdigit(*cp++))
return(0);
break;
case 'O':
if (*cp != ' ' && !isdigit(*cp))
return(0);
cp++;
break;
case 'p':
if (!ispunct(*cp++))
return(0);
break;
case 'P':
if (*cp != ' ' && !ispunct(*cp))
return(0);
cp++;
break;
case ':':
if (*cp++ != ':')
return(0);
break;
case 'N':
if (*cp++ != '\n')
return(0);
break;
}
if (*cp || *tp)
return(0);
return(1);
}
/*
* Collect a liberal (space, tab delimited) word into the word buffer
* passed. Also, return a pointer to the next word following that,
* or NULL if none follow.
*/
char *
nextword(char *wp, char *wbuf)
{
int c;
if (wp == NULL) {
*wbuf = 0;
return(NULL);
}
while ((c = *wp++) && c != ' ' && c != '\t') {
*wbuf++ = c;
if (c == '"') {
while ((c = *wp++) && c != '"')
*wbuf++ = c;
if (c == '"')
*wbuf++ = c;
else
wp--;
}
}
*wbuf = '\0';
for (; c == ' ' || c == '\t'; c = *wp++)
;
if (c == 0)
return(NULL);
return(wp - 1);
}
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