Commit | Line | Data |
---|---|---|
c0c3707f CB |
1 | /* Provide access to the last buffer returned by localtime() or gmtime(). |
2 | ||
3 | Copyright (C) 2001-2003, 2005-2007, 2009-2019 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 3, 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, see <https://www.gnu.org/licenses/>. */ | |
17 | ||
18 | /* written by Jim Meyering */ | |
19 | ||
20 | #include <config.h> | |
21 | ||
22 | /* Specification. */ | |
23 | #include "localtime-buffer.h" | |
24 | ||
25 | #if GETTIMEOFDAY_CLOBBERS_LOCALTIME || TZSET_CLOBBERS_LOCALTIME | |
26 | ||
27 | static struct tm tm_zero_buffer; | |
28 | struct tm *localtime_buffer_addr = &tm_zero_buffer; | |
29 | ||
30 | /* This is a wrapper for localtime. | |
31 | ||
32 | On the first call, record the address of the static buffer that | |
33 | localtime uses for its result. */ | |
34 | ||
35 | struct tm * | |
36 | rpl_localtime (time_t const *timep) | |
37 | #undef localtime | |
38 | { | |
39 | struct tm *tm = localtime (timep); | |
40 | ||
41 | if (localtime_buffer_addr == &tm_zero_buffer) | |
42 | localtime_buffer_addr = tm; | |
43 | ||
44 | return tm; | |
45 | } | |
46 | ||
47 | /* Same as above, since gmtime and localtime use the same buffer. */ | |
48 | struct tm * | |
49 | rpl_gmtime (time_t const *timep) | |
50 | #undef gmtime | |
51 | { | |
52 | struct tm *tm = gmtime (timep); | |
53 | ||
54 | if (localtime_buffer_addr == &tm_zero_buffer) | |
55 | localtime_buffer_addr = tm; | |
56 | ||
57 | return tm; | |
58 | } | |
59 | ||
60 | #endif |