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/*
Date manipulation routines
Copyright (C) 1999-2003, Joe Orton <joe@manyfish.co.uk>
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., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA
*/
#include "config.h"
#include <sys/types.h>
#include <time.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <stdio.h>
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "ne_alloc.h"
#include "ne_dates.h"
#include "ne_utils.h"
/* Generic date manipulation routines. */
/* ISO8601: 2001-01-01T12:30:00Z */
#define ISO8601_FORMAT_Z "%04d-%02d-%02dT%02d:%02d:%lfZ"
#define ISO8601_FORMAT_M "%04d-%02d-%02dT%02d:%02d:%lf-%02d:%02d"
#define ISO8601_FORMAT_P "%04d-%02d-%02dT%02d:%02d:%lf+%02d:%02d"
/* RFC1123: Sun, 06 Nov 1994 08:49:37 GMT */
#define RFC1123_FORMAT "%3s, %02d %3s %4d %02d:%02d:%02d GMT"
/* RFC850: Sunday, 06-Nov-94 08:49:37 GMT */
#define RFC1036_FORMAT "%s %2d-%3s-%2d %2d:%2d:%2d GMT"
/* asctime: Wed Jun 30 21:49:08 1993 */
#define ASCTIME_FORMAT "%3s %3s %2d %2d:%2d:%2d %4d"
static const char *rfc1123_weekdays[7] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
static const char *short_months[12] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
#if defined(HAVE_STRUCT_TM_TM_GMTOFF)
#define GMTOFF(t) ((t).tm_gmtoff)
#else
/* FIXME: work out the offset anyway. */
#define GMTOFF(t) (0)
#endif
/* Returns the time/date GMT, in RFC1123-type format: eg
* Sun, 06 Nov 1994 08:49:37 GMT. */
char *ne_rfc1123_date(time_t anytime) {
struct tm *gmt;
char *ret;
gmt = gmtime(&anytime);
if (gmt == NULL)
return NULL;
ret = ne_malloc(29 + 1); /* dates are 29 chars long */
/* it goes: Sun, 06 Nov 1994 08:49:37 GMT */
ne_snprintf(ret, 30, RFC1123_FORMAT,
rfc1123_weekdays[gmt->tm_wday], gmt->tm_mday,
short_months[gmt->tm_mon], 1900 + gmt->tm_year,
gmt->tm_hour, gmt->tm_min, gmt->tm_sec);
return ret;
}
/* Takes an ISO-8601-formatted date string and returns the time_t.
* Returns (time_t)-1 if the parse fails. */
time_t ne_iso8601_parse(const char *date)
{
struct tm gmt = {0};
int off_hour, off_min;
double sec;
off_t fix;
int n;
/* it goes: ISO8601: 2001-01-01T12:30:00+03:30 */
if ((n = sscanf(date, ISO8601_FORMAT_P,
&gmt.tm_year, &gmt.tm_mon, &gmt.tm_mday,
&gmt.tm_hour, &gmt.tm_min, &sec,
&off_hour, &off_min)) == 8) {
gmt.tm_sec = (int)sec;
fix = - off_hour * 3600 - off_min * 60;
}
/* it goes: ISO8601: 2001-01-01T12:30:00-03:30 */
else if ((n = sscanf(date, ISO8601_FORMAT_M,
&gmt.tm_year, &gmt.tm_mon, &gmt.tm_mday,
&gmt.tm_hour, &gmt.tm_min, &sec,
&off_hour, &off_min)) == 8) {
gmt.tm_sec = (int)sec;
fix = off_hour * 3600 + off_min * 60;
}
/* it goes: ISO8601: 2001-01-01T12:30:00Z */
else if ((n = sscanf(date, ISO8601_FORMAT_Z,
&gmt.tm_year, &gmt.tm_mon, &gmt.tm_mday,
&gmt.tm_hour, &gmt.tm_min, &sec)) == 6) {
gmt.tm_sec = (int)sec;
fix = 0;
}
else {
return (time_t)-1;
}
gmt.tm_year -= 1900;
gmt.tm_isdst = -1;
gmt.tm_mon--;
return mktime(&gmt) + fix + GMTOFF(gmt);
}
/* Takes an RFC1123-formatted date string and returns the time_t.
* Returns (time_t)-1 if the parse fails. */
time_t ne_rfc1123_parse(const char *date)
{
struct tm gmt = {0};
static char wkday[4], mon[4];
int n;
/* it goes: Sun, 06 Nov 1994 08:49:37 GMT */
n = sscanf(date, RFC1123_FORMAT,
wkday, &gmt.tm_mday, mon, &gmt.tm_year, &gmt.tm_hour,
&gmt.tm_min, &gmt.tm_sec);
/* Is it portable to check n==7 here? */
gmt.tm_year -= 1900;
for (n=0; n<12; n++)
if (strcmp(mon, short_months[n]) == 0)
break;
/* tm_mon comes out as 12 if the month is corrupt, which is desired,
* since the mktime will then fail */
gmt.tm_mon = n;
gmt.tm_isdst = -1;
return mktime(&gmt) + GMTOFF(gmt);
}
/* Takes a string containing a RFC1036-style date and returns the time_t */
time_t ne_rfc1036_parse(const char *date)
{
struct tm gmt = {0};
int n;
static char wkday[10], mon[4];
/* RFC850/1036 style dates: Sunday, 06-Nov-94 08:49:37 GMT */
n = sscanf(date, RFC1036_FORMAT,
wkday, &gmt.tm_mday, mon, &gmt.tm_year,
&gmt.tm_hour, &gmt.tm_min, &gmt.tm_sec);
if (n != 7) {
return (time_t)-1;
}
/* portable to check n here? */
for (n=0; n<12; n++)
if (strcmp(mon, short_months[n]) == 0)
break;
/* tm_mon comes out as 12 if the month is corrupt, which is desired,
* since the mktime will then fail */
/* Defeat Y2K bug. */
if (gmt.tm_year < 50)
gmt.tm_year += 100;
gmt.tm_mon = n;
gmt.tm_isdst = -1;
return mktime(&gmt) + GMTOFF(gmt);
}
/* (as)ctime dates are like:
* Wed Jun 30 21:49:08 1993
*/
time_t ne_asctime_parse(const char *date)
{
struct tm gmt = {0};
int n;
static char wkday[4], mon[4];
n = sscanf(date, ASCTIME_FORMAT,
wkday, mon, &gmt.tm_mday,
&gmt.tm_hour, &gmt.tm_min, &gmt.tm_sec,
&gmt.tm_year);
/* portable to check n here? */
for (n=0; n<12; n++)
if (strcmp(mon, short_months[n]) == 0)
break;
/* tm_mon comes out as 12 if the month is corrupt, which is desired,
* since the mktime will then fail */
gmt.tm_mon = n;
gmt.tm_isdst = -1;
return mktime(&gmt) + GMTOFF(gmt);
}
/* HTTP-date parser */
time_t ne_httpdate_parse(const char *date)
{
time_t tmp;
tmp = ne_rfc1123_parse(date);
if (tmp == -1) {
tmp = ne_rfc1036_parse(date);
if (tmp == -1)
tmp = ne_asctime_parse(date);
}
return tmp;
}
#undef RFC1036_FORMAT
#undef ASCTIME_FORMAT
#undef RFC1123_FORMAT
#ifdef RFC1123_TEST
int main(int argc, char **argv) {
time_t now, in;
char *out;
if (argc > 1) {
printf("Got: %s\n", argv[1]);
in = ne_rfc1123_parse(argv[1]);
printf("Parsed: %d\n", in);
out = ne_rfc1123_date(in);
printf("Back again: %s\n", out);
} else {
now = time(NULL);
out = ne_rfc1123_date(now);
in = ne_rfc1123_parse(out);
printf("time(NULL) = %d\n", now);
printf("RFC1123 Time: [%s]\n", out);
printf("Parsed = %d\n", in);
out = ne_rfc1123_date(in);
printf("Back again: [%s]\n", out);
}
return 0;
}
#endif
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