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/*
* Copyright (C) 1996-8 Michael R. Elkins <me@cs.hmc.edu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* Slightly modified version from Mutt 0.94.4i */
#include <ctype.h>
#include <string.h>
#include <time.h>
#define ISSPACE(c) isspace((unsigned char)c)
#define SKIPWS(c) while (*(c) && isspace ((unsigned char) *(c))) c++;
const char *Weekdays[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
const char *Months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
"Sep", "Oct", "Nov", "Dec", "ERR" };
static const char *next_word (const char *s)
{
while (*s && !ISSPACE (*s))
s++;
SKIPWS (s);
return s;
}
int check_month (const char *s)
{
int i;
for (i = 0; i < 12; i++)
if (strncasecmp (s, Months[i], 3) == 0)
return (i);
return (-1); /* error */
}
static int is_day_name (const char *s)
{
int i;
if (!ISSPACE (*(s+3)))
return 0;
for (i=0; i<7; i++)
if (strncasecmp (s, Weekdays[i], 3) == 0)
return 1;
return 0;
}
/*
* A valid message separator looks like:
*
* From [ <return-path> ] <weekday> <month> <day> <time> [ <timezone> ] <year>
*/
int is_from (const char *s, char *path, size_t pathlen)
{
struct tm tm;
int yr;
if (path)
*path = 0;
if (strncmp ("From ", s, 5) != 0)
return 0;
s = next_word (s); /* skip over the From part. */
if (!*s)
return 0;
if (!is_day_name (s))
{
const char *p;
size_t len;
/* looks like we got the return-path, so extract it */
if (*s == '"')
{
/* sometimes we see bogus addresses like
* From "/foo/bar baz/"@dumbdar.com Sat Nov 22 15:29:32 PST 1997
*/
p = s;
p++; /* skip over the quote */
do
{
if (!(p = strpbrk (p, "\\\"")))
return 0;
if (*p == '\\')
p += 2;
}
while (*p != '"');
while (*p && !ISSPACE (*p))
p++;
}
else
{
if ((p = strchr (s, ' ')) == NULL)
return 0;
}
if (path)
{
len = (size_t) (p - s);
if (len + 1 > pathlen)
len = pathlen - 1;
memcpy (path, s, len);
path[len] = 0;
}
s = p + 1;
SKIPWS (s);
if (!*s)
return 0;
if (!is_day_name (s))
{
return 0;
}
}
s = next_word (s);
if (!*s) return 0;
/* do a quick check to make sure that this isn't really the day of the week.
* this could happen when receiving mail from a local user whose login name
* is the same as a three-letter abbreviation of the day of the week.
*/
if (is_day_name (s))
{
s = next_word (s);
if (!*s) return 0;
}
/* now we should be on the month. */
if ((tm.tm_mon = check_month (s)) < 0) return 0;
/* day */
s = next_word (s);
if (!*s) return 0;
if (sscanf (s, "%d", &tm.tm_mday) != 1) return 0;
/* time */
s = next_word (s);
if (!*s) return 0;
/* Accept either HH:MM or HH:MM:SS */
if (sscanf (s, "%d:%d:%d", &tm.tm_hour, &tm.tm_min, &tm.tm_sec) == 3);
else if (sscanf (s, "%d:%d", &tm.tm_hour, &tm.tm_min) == 2)
tm.tm_sec = 0;
else
return 0;
s = next_word (s);
if (!*s) return 0;
/* timezone? */
if (isalpha ((unsigned char) *s) || *s == '+' || *s == '-')
{
s = next_word (s);
if (!*s) return 0;
/*
* some places have two timezone fields after the time, e.g.
* From xxxx@yyyyyyy.fr Wed Aug 2 00:39:12 MET DST 1995
*/
if (isalpha ((unsigned char) *s))
{
s = next_word (s);
if (!*s) return 0;
}
}
/* year */
if (sscanf (s, "%d", &yr) != 1) return 0;
tm.tm_year = yr > 1900 ? yr - 1900 : yr;
tm.tm_isdst = 0;
tm.tm_yday = 0;
tm.tm_wday = 0;
/* return (mutt_mktime (&tm, 0)); */
return 1;
}
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