2 * @file common.c common routines for Liferea
4 * Copyright (C) 2003-2005 Lars Lindner <lars.lindner@gmx.net>
5 * Copyright (C) 2004,2005 Nathan J. Conrad <t98502@users.sourceforge.net>
6 * Copyright (C) 2004 Karl Soderstrom <ks@xanadunet.net>
8 * parts of the RFC822 timezone decoding were taken from the gmime
11 * Authors: Michael Zucchi <notzed@helixcode.com>
12 * Jeffrey Stedfast <fejj@helixcode.com>
14 * Copyright 2000 Helix Code, Inc. (www.helixcode.com)
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
35 /* this is needed for strptime() */
36 #define _XOPEN_SOURCE /* glibc2 needs this */
45 /* converts a ISO 8601 time string to a time_t value */
46 time_t parseISO8601Date(gchar *date) {
48 time_t t, t2, offset = 0;
49 gboolean success = FALSE;
55 memset(&tm, 0, sizeof(struct tm));
57 /* we expect at least something like "2003-08-07T15:28:19" and
58 don't require the second fractions and the timezone info
60 the most specific format: YYYY-MM-DDThh:mm:ss.sTZD
63 /* full specified variant */
64 if(NULL != (pos = strptime((const char *)date, "%Y-%m-%dT%H:%M:%SZ", &tm))) {
68 if (isdigit(pos[0]) && !isdigit(pos[1])) {
69 tm.tm_sec = pos[0] - '0';
71 } else if (isdigit(pos[0]) && isdigit(pos[1])) {
72 tm.tm_sec = 10*(pos[0]-'0') + pos[1] - '0';
78 else if ((*pos == '+' || *pos == '-') && isdigit(pos[1]) && isdigit(pos[2]) && strlen(pos) >= 3) {
79 offset = (10*(pos[1] - '0') + (pos[2] - '0')) * 60 * 60;
81 if (pos[3] == ':' && isdigit(pos[4]) && isdigit(pos[5]))
82 offset += (10*(pos[4] - '0') + (pos[5] - '0')) * 60;
83 else if (isdigit(pos[3]) && isdigit(pos[4]))
84 offset += (10*(pos[3] - '0') + (pos[4] - '0')) * 60;
86 offset *= (pos[0] == '+') ? 1 : -1;
91 } else if(NULL != strptime((const char *)date, "%t%Y-%m-%d", &tm))
93 /* there were others combinations too... */
96 if((time_t)(-1) != (t = mktime(&tm))) {
97 /* Correct for the local timezone*/
99 t2 = mktime(gmtime(&t));
104 g_warning("internal error! time conversion error! mktime failed!\n");
107 g_warning("Invalid ISO8601 date format! Ignoring <dc:date> information!\n");
113 gchar *dayofweek[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
114 gchar *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
116 gchar *createRFC822Date(const time_t *time) {
119 tm = gmtime(time); /* No need to free because it is statically allocated */
120 return g_strdup_printf("%s, %2d %s %4d %02d:%02d:%02d GMT", dayofweek[tm->tm_wday], tm->tm_mday,
121 months[tm->tm_mon], 1900 + tm->tm_year, tm->tm_hour, tm->tm_min, tm->tm_sec);
124 time_t parseRFC822Date(gchar *date)
127 memset(&t, 0, sizeof(struct tm));
128 const char *c = setlocale(LC_TIME, NULL);
130 /* Adjust the LC_TIME locale to standard C in order for strptime()
131 * to work reliably. */
133 setlocale(LC_TIME, "C");
135 if (!strptime(date, "%a, %d %b %Y %H:%M:%S %Z", &t) &&
136 !strptime(date, "%a, %d %b %Y %H:%M %Z", &t)) {
137 g_warning("Invalid RFC822 date!\n");
139 setlocale(LC_TIME, c);
143 /* Restore the original LC_TIME locale. */
145 setlocale(LC_TIME, c);