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from.c
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C/C++ Source or Header
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1998-01-28
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4KB
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188 lines
/*
* 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.
*/
#include "mutt.h"
#include <ctype.h>
#include <string.h>
static const char *next_word (const char *s)
{
while (*s && !ISSPACE (*s))
s++;
SKIPWS (s);
return s;
}
int mutt_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>
*/
time_t is_from (const char *s, char *path, size_t pathlen)
{
struct tm tm;
int yr;
*path = 0;
if (strncmp ("From ", s, 5) != 0)
return 0;
s = next_word (s); /* skip over the From part. */
if (!*s)
return 0;
dprint (3, (debugfile, "\nis_from(): parsing: %s", s));
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;
}
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))
{
dprint(1, (debugfile, "is_from(): expected weekday, got: %s\n", 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 = mutt_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 (*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 (*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;
dprint (3,(debugfile, "is_from(): month=%d, day=%d, hr=%d, min=%d, sec=%d, yr=%d.\n",
tm.tm_mon, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_year));
tm.tm_isdst = 0;
tm.tm_yday = 0;
tm.tm_wday = 0;
return (mktime (&tm));
}