1 /* PO/POT file timestamps.
2 Copyright (C) 1995-1998, 2000-2003, 2006 Free Software Foundation, Inc.
3 Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, April 1995.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
8 any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18
19 #ifdef HAVE_CONFIG_H
20 # include <config.h>
21 #endif
22
23 /* Specification. */
24 #include "po-time.h"
25
26 #include "xvasprintf.h"
27
28
29 #define TM_YEAR_ORIGIN 1900
30
31 /* Yield A - B, measured in seconds. */
32 static long
difftm(const struct tm * a,const struct tm * b)33 difftm (const struct tm *a, const struct tm *b)
34 {
35 int ay = a->tm_year + TM_YEAR_ORIGIN - 1;
36 int by = b->tm_year + TM_YEAR_ORIGIN - 1;
37 /* Some compilers cannot handle this as a single return statement. */
38 long days = (
39 /* difference in day of year */
40 a->tm_yday - b->tm_yday
41 /* + intervening leap days */
42 + ((ay >> 2) - (by >> 2))
43 - (ay / 100 - by / 100)
44 + ((ay / 100 >> 2) - (by / 100 >> 2))
45 /* + difference in years * 365 */
46 + (long) (ay - by) * 365l);
47
48 return 60l * (60l * (24l * days + (a->tm_hour - b->tm_hour))
49 + (a->tm_min - b->tm_min))
50 + (a->tm_sec - b->tm_sec);
51 }
52
53
54 char *
po_strftime(const time_t * tp)55 po_strftime (const time_t *tp)
56 {
57 struct tm local_time;
58 char tz_sign;
59 long tz_min;
60
61 local_time = *localtime (tp);
62 tz_sign = '+';
63 tz_min = difftm (&local_time, gmtime (tp)) / 60;
64 if (tz_min < 0)
65 {
66 tz_min = -tz_min;
67 tz_sign = '-';
68 }
69 return xasprintf ("%d-%02d-%02d %02d:%02d%c%02ld%02ld",
70 local_time.tm_year + TM_YEAR_ORIGIN,
71 local_time.tm_mon + 1,
72 local_time.tm_mday,
73 local_time.tm_hour,
74 local_time.tm_min,
75 tz_sign, tz_min / 60, tz_min % 60);
76 }
77