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/*
* Copyright (C) 2009 Colin DIDIER
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* XEP-0082: XMPP Date and Time Profiles
*/
#ifdef __linux__
#define _XOPEN_SOURCE
#endif
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#define FORMAT "%Y-%m-%dT%T"
#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
static long
parse_timezone(const char *tz)
{
const char *rfc822_timezones[][4] = {
{ "M", NULL }, /* UTC-12 */
{ "L", NULL },
{ "K", NULL },
{ "I", NULL },
{ "H", "PST", NULL }, /* UTC-8 */
{ "G", "MST", "PDT", NULL }, /* UTC-7 */
{ "F", "CST", "MDT", NULL }, /* UTC-6 */
{ "E", "EST", "CDT", NULL }, /* UTC-5 */
{ "D", "EDT", NULL }, /* UTC-4 */
{ "C", NULL },
{ "B", NULL },
{ "A", NULL },
{ "Z", "UT", "GMT", NULL }, /* UTC */
{ "N", NULL },
{ "O", NULL },
{ "P", NULL },
{ "Q", NULL },
{ "R", NULL },
{ "S", NULL },
{ "T", NULL },
{ "U", NULL },
{ "V", NULL },
{ "W", NULL },
{ "X", NULL },
{ "Y", NULL }, /* UTC+12 */
{ NULL },
};
unsigned int i, j;
if ((*tz == '+' || *tz == '-') && strlen(tz) == 5) {
i = atoi(tz);
return ((i/100)*60 + i%100) * 60;
}
for (i = 0; i < nitems(rfc822_timezones); ++i)
for (j = 0; rfc822_timezones[i][j] != NULL; ++j)
if (strcmp(rfc822_timezones[i][j], tz) == 0)
return (i - 12) * 3600;
return 0;
}
time_t
xep82_datetime(const char *stamp)
{
struct tm tm;
long offset;
char *s;
memset(&tm, 0, sizeof(struct tm));
if ((s = strptime(stamp, FORMAT, &tm)) == NULL)
return (time_t)-1;
/* ignore fractional second addendum */
if (*s++ == '.')
while (isdigit(*s)) s++;
tm.tm_isdst = -1;
offset = *s != '\0' ? parse_timezone(s) : 0;
return mktime(&tm) - offset;
}
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