1 /* Reentrant time functions like localtime_r.
2
3 Copyright (C) 2003 Free Software Foundation, Inc.
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 along
16 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 /* Written by Paul Eggert. */
20
21 #ifdef HAVE_CONFIG_H
22 # include <config.h>
23 #endif
24
25 #include "time_r.h"
26
27 #include <string.h>
28
29 static char *
copy_string_result(char * dest,char const * src)30 copy_string_result (char *dest, char const *src)
31 {
32 if (! src)
33 return 0;
34 return strcpy (dest, src);
35 }
36
37 static struct tm *
copy_tm_result(struct tm * dest,struct tm const * src)38 copy_tm_result (struct tm *dest, struct tm const *src)
39 {
40 if (! src)
41 return 0;
42 *dest = *src;
43 return dest;
44 }
45
46
47 char *
asctime_r(struct tm const * restrict tm,char * restrict buf)48 asctime_r (struct tm const * restrict tm, char * restrict buf)
49 {
50 return copy_string_result (buf, asctime (tm));
51 }
52
53 char *
ctime_r(time_t const * t,char * buf)54 ctime_r (time_t const *t, char *buf)
55 {
56 return copy_string_result (buf, ctime (t));
57 }
58
59 struct tm *
gmtime_r(time_t const * restrict t,struct tm * restrict tp)60 gmtime_r (time_t const * restrict t, struct tm * restrict tp)
61 {
62 return copy_tm_result (tp, gmtime (t));
63 }
64
65 struct tm *
localtime_r(time_t const * restrict t,struct tm * restrict tp)66 localtime_r (time_t const * restrict t, struct tm * restrict tp)
67 {
68 return copy_tm_result (tp, localtime (t));
69 }
70