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/*
* http_date.c -- Routines for parsing and generating http dates
* Created: Christopher Blizzard <blizzard@appliedtheory.com>, 16-Aug-1998
*
* Copyright (C) 1998 Free Software Foundation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <string.h>
#include <ctype.h>
#include "http_date.h"
static int
month_from_string_short(const char *a_month);
/*
* date formats come in one of the following three flavors according to
* rfc 2068 and later drafts:
*
* Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123
* Sunday, 06-Nov-1994, 08:49:37 GMT ; RFC 850, updated by RFC 1036
* Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
*
* the first format is preferred however all must be supported.
*/
time_t
http_date_to_time(const char *a_date)
{
struct tm l_tm_time;
time_t l_return = 0;
char l_buf[12];
const char *l_start_date = NULL;
int i = 0;
/* make sure we can use it */
if (!a_date)
return -1;
memset(&l_tm_time, 0, sizeof(struct tm));
memset(l_buf, 0, 12);
/* try to figure out which format it's in */
/* rfc 1123 */
if (a_date[3] == ',')
{
if (strlen(a_date) != 29)
return -1;
/* make sure that everything is legal */
if (a_date[4] != ' ')
return -1;
/* 06 */
if ((isdigit(a_date[5]) == 0) ||
(isdigit(a_date[6]) == 0))
return -1;
/* Nov */
if ((l_tm_time.tm_mon = month_from_string_short(&a_date[8])) < 0)
return -1;
/* 1994 */
if ((isdigit(a_date[12]) == 0) ||
(isdigit(a_date[13]) == 0) ||
(isdigit(a_date[14]) == 0) ||
(isdigit(a_date[15]) == 0))
return -1;
if (a_date[16] != ' ')
return -1;
/* 08:49:37 */
if ((isdigit(a_date[17]) == 0) ||
(isdigit(a_date[18]) == 0) ||
(a_date[19] != ':') ||
(isdigit(a_date[20]) == 0) ||
(isdigit(a_date[21]) == 0) ||
(a_date[22] != ':') ||
(isdigit(a_date[23]) == 0) ||
(isdigit(a_date[24]) == 0))
return -1;
if (a_date[25] != ' ')
return -1;
/* GMT */
if (strncmp(&a_date[26], "GMT", 3) != 0)
return -1;
/* ok, it's valid. Do it */
/* parse out the day of the month */
l_tm_time.tm_mday += (a_date[5] - 0x30) * 10;
l_tm_time.tm_mday += (a_date[6] - 0x30);
/* already got the month from above */
/* parse out the year */
l_tm_time.tm_year += (a_date[12] - 0x30) * 1000;
l_tm_time.tm_year += (a_date[13] - 0x30) * 100;
l_tm_time.tm_year += (a_date[14] - 0x30) * 10;
l_tm_time.tm_year += (a_date[15] - 0x30);
l_tm_time.tm_year -= 1900;
/* parse out the time */
l_tm_time.tm_hour += (a_date[17] - 0x30) * 10;
l_tm_time.tm_hour += (a_date[18] - 0x30);
l_tm_time.tm_min += (a_date[20] - 0x30) * 10;
l_tm_time.tm_min += (a_date[21] - 0x30);
l_tm_time.tm_sec += (a_date[23] - 0x30) * 10;
l_tm_time.tm_sec += (a_date[24] - 0x30);
/* ok, generate the result */
l_return = mktime(&l_tm_time);
}
/* ansi C */
else if (a_date[3] == ' ')
{
if (strlen(a_date) != 24)
return -1;
/* Nov */
if ((l_tm_time.tm_mon =
month_from_string_short(&a_date[4])) < 0)
return -1;
if (a_date[7] != ' ')
return -1;
/* "10" or " 6" */
if (((a_date[8] != ' ') && (isdigit(a_date[8]) == 0)) ||
(isdigit(a_date[9]) == 0))
return -1;
if (a_date[10] != ' ')
return -1;
/* 08:49:37 */
if ((isdigit(a_date[11]) == 0) ||
(isdigit(a_date[12]) == 0) ||
(a_date[13] != ':') ||
(isdigit(a_date[14]) == 0) ||
(isdigit(a_date[15]) == 0) ||
(a_date[16] != ':') ||
(isdigit(a_date[17]) == 0) ||
(isdigit(a_date[18]) == 0))
return -1;
if (a_date[19] != ' ')
return -1;
/* 1994 */
if ((isdigit(a_date[20]) == 0) ||
(isdigit(a_date[21]) == 0) ||
(isdigit(a_date[22]) == 0) ||
(isdigit(a_date[23]) == 0))
return -1;
/* looks good */
/* got the month from above */
/* parse out the day of the month */
if (a_date[8] != ' ')
l_tm_time.tm_mday += (a_date[8] - 0x30) * 10;
l_tm_time.tm_mday += (a_date[9] - 0x30);
/* parse out the time */
l_tm_time.tm_hour += (a_date[11] - 0x30) * 10;
l_tm_time.tm_hour += (a_date[12] - 0x30);
l_tm_time.tm_min += (a_date[14] - 0x30) * 10;
l_tm_time.tm_min += (a_date[15] - 0x30);
l_tm_time.tm_sec += (a_date[17] - 0x30) * 10;
l_tm_time.tm_sec += (a_date[18] - 0x30);
/* parse out the year */
l_tm_time.tm_year += (a_date[20] - 0x30) * 1000;
l_tm_time.tm_year += (a_date[21] - 0x30) * 100;
l_tm_time.tm_year += (a_date[22] - 0x30) * 10;
l_tm_time.tm_year += (a_date[23] - 0x30);
l_tm_time.tm_year -= 1900;
/* generate the result */
l_return = mktime(&l_tm_time);
}
/* must be the 1036... */
else
{
/* check to make sure we won't rn out of any bounds */
if (strlen(a_date) < 11)
return -1;
while (a_date[i])
{
if (a_date[i] == ' ')
{
l_start_date = &a_date[i+1];
break;
}
i++;
}
/* check to make sure there was a space found */
if (l_start_date == NULL)
return -1;
/* check to make sure that we don't overrun anything */
if (strlen(l_start_date) != 22)
return -1;
/* make sure that the rest of the date was valid */
/* 06- */
if ((isdigit(l_start_date[0]) == 0) ||
(isdigit(l_start_date[1]) == 0) ||
(l_start_date[2] != '-'))
return -1;
/* Nov */
if ((l_tm_time.tm_mon =
month_from_string_short(&l_start_date[3])) < 0)
return -1;
/* -94 */
if ((l_start_date[6] != '-') ||
(isdigit(l_start_date[7]) == 0) ||
(isdigit(l_start_date[8]) == 0))
return -1;
if (l_start_date[9] != ' ')
return -1;
/* 08:49:37 */
if ((isdigit(l_start_date[10]) == 0) ||
(isdigit(l_start_date[11]) == 0) ||
(l_start_date[12] != ':') ||
(isdigit(l_start_date[13]) == 0) ||
(isdigit(l_start_date[14]) == 0) ||
(l_start_date[15] != ':') ||
(isdigit(l_start_date[16]) == 0) ||
(isdigit(l_start_date[17]) == 0))
return -1;
if (l_start_date[18] != ' ')
return -1;
if (strncmp(&l_start_date[19], "GMT", 3) != 0)
return -1;
/* looks ok to parse */
/* parse out the day of the month */
l_tm_time.tm_mday += (l_start_date[0] - 0x30) * 10;
l_tm_time.tm_mday += (l_start_date[1] - 0x30);
/* have the month from above */
/* parse out the year */
l_tm_time.tm_year += (l_start_date[7] - 0x30) * 10;
l_tm_time.tm_year += (l_start_date[8] - 0x30);
/* check for y2k */
if (l_tm_time.tm_year < 20)
l_tm_time.tm_year += 100;
/* parse out the time */
l_tm_time.tm_hour += (l_start_date[10] - 0x30) * 10;
l_tm_time.tm_hour += (l_start_date[11] - 0x30);
l_tm_time.tm_min += (l_start_date[13] - 0x30) * 10;
l_tm_time.tm_min += (l_start_date[14] - 0x30);
l_tm_time.tm_sec += (l_start_date[16] - 0x30) * 10;
l_tm_time.tm_sec += (l_start_date[17] - 0x30);
/* generate the result */
l_return = mktime(&l_tm_time);
}
return l_return;
}
static int
month_from_string_short(const char *a_month)
{
if (strncmp(a_month, "Jan", 3) == 0)
return 0;
if (strncmp(a_month, "Feb", 3) == 0)
return 1;
if (strncmp(a_month, "Mar", 3) == 0)
return 2;
if (strncmp(a_month, "Apr", 3) == 0)
return 3;
if (strncmp(a_month, "May", 3) == 0)
return 4;
if (strncmp(a_month, "Jun", 3) == 0)
return 5;
if (strncmp(a_month, "Jul", 3) == 0)
return 6;
if (strncmp(a_month, "Aug", 3) == 0)
return 7;
if (strncmp(a_month, "Sep", 3) == 0)
return 8;
if (strncmp(a_month, "Oct", 3) == 0)
return 9;
if (strncmp(a_month, "Nov", 3) == 0)
return 10;
if (strncmp(a_month, "Dec", 3) == 0)
return 11;
/* not a valid date */
return -1;
}
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