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 #if !defined (__FreeBSD__)
37 #define _XOPEN_SOURCE 600 /* glibc2 needs this */
53 #include "procheader.h"
55 /* converts a ISO 8601 time string to a time_t value */
56 time_t parseISO8601Date(gchar *date) {
58 time_t t, t2, offset = 0;
59 gboolean success = FALSE;
61 gchar *tmp = g_strdup(date);
62 gint result, year, month, day, hour, minute, second;
66 g_assert(date != NULL);
68 memset(&tm, 0, sizeof(struct tm));
72 result = sscanf((const char *)date, "%d-%d-%dT%d:%d:%d",
73 &year, &month, &day, &hour, &minute, &second);
85 tm.tm_mon = month - 1;
86 tm.tm_year = year - 1900;
93 /* we expect at least something like "2003-08-07T15:28:19" and
94 don't require the second fractions and the timezone info
96 the most specific format: YYYY-MM-DDThh:mm:ss.sTZD
99 /* full specified variant */
100 if(NULL != (pos = strptime((const char *)date, "%t%Y-%m-%dT%H:%M%t", &tm))) {
104 if (isdigit(pos[0]) && !isdigit(pos[1])) {
105 tm.tm_sec = pos[0] - '0';
107 } else if (isdigit(pos[0]) && isdigit(pos[1])) {
108 tm.tm_sec = 10*(pos[0]-'0') + pos[1] - '0';
114 else if ((*pos == '+' || *pos == '-') && isdigit(pos[1]) && isdigit(pos[2]) && strlen(pos) >= 3) {
115 offset = (10*(pos[1] - '0') + (pos[2] - '0')) * 60 * 60;
117 if (pos[3] == ':' && isdigit(pos[4]) && isdigit(pos[5]))
118 offset += (10*(pos[4] - '0') + (pos[5] - '0')) * 60;
119 else if (isdigit(pos[3]) && isdigit(pos[4]))
120 offset += (10*(pos[3] - '0') + (pos[4] - '0')) * 60;
122 offset *= (pos[0] == '+') ? 1 : -1;
127 } else if(NULL != strptime((const char *)date, "%t%Y-%m-%d", &tm))
129 /* there were others combinations too... */
131 if(TRUE == success) {
132 if((time_t)(-1) != (t = mktime(&tm))) {
134 /* Correct for the local timezone*/
136 t2 = mktime(gmtime_r(&t, &buft));
141 g_warning("internal error! time conversion error! mktime failed!\n");
144 g_warning("Invalid ISO8601 date format! Ignoring <dc:date> information!\n");
150 gchar *dayofweek[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
151 gchar *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
153 gchar *createRFC822Date(const time_t *time) {
159 tm = gmtime_r(&t, &buft);
163 tm = gmtime_r(time, &buft); /* No need to free because it is statically allocated */
165 return g_strdup_printf("%s, %2d %s %4d %02d:%02d:%02d GMT", dayofweek[tm->tm_wday], tm->tm_mday,
166 months[tm->tm_mon], 1900 + tm->tm_year, tm->tm_hour, tm->tm_min, tm->tm_sec);