| 1 | /* Work around the bug in some systems whereby gettimeofday clobbers the
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| 2 | static buffer that localtime uses for it's return value. The gettimeofday
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| 3 | function from Mac OS X 10.0.4, i.e. Darwin 1.3.7 has this problem.
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| 4 | The tzset replacement is necessary for at least Solaris 2.5, 2.5.1, and 2.6.
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| 5 |
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| 6 | Copyright (C) 2001, 2002, 2003, 2006 Free Software Foundation, Inc.
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| 7 |
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| 8 | This program is free software; you can redistribute it and/or modify
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| 9 | it under the terms of the GNU General Public License as published by
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| 10 | the Free Software Foundation; either version 2, or (at your option)
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| 11 | any later version.
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| 12 |
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| 13 | This program is distributed in the hope that it will be useful,
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| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | GNU General Public License for more details.
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| 17 |
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| 18 | You should have received a copy of the GNU General Public License
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| 19 | along with this program; if not, write to the Free Software Foundation,
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| 20 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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| 21 |
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| 22 | /* written by Jim Meyering */
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| 23 |
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| 24 | #include <config.h>
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| 25 |
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| 26 | /* Disable the definitions of these functions (from config.h)
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| 27 | so we can use the library versions here. */
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| 28 | #undef gettimeofday
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| 29 | #undef gmtime
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| 30 | #undef localtime
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| 31 | #undef tzset
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| 32 |
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| 33 | #include <sys/types.h>
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| 34 |
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| 35 | #if TIME_WITH_SYS_TIME
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| 36 | # include <sys/time.h>
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| 37 | # include <time.h>
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| 38 | #else
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| 39 | # if HAVE_SYS_TIME_H
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| 40 | # include <sys/time.h>
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| 41 | # else
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| 42 | # include <time.h>
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| 43 | # endif
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| 44 | #endif
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| 45 |
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| 46 | #include <stdlib.h>
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| 47 |
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| 48 | static struct tm *localtime_buffer_addr;
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| 49 |
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| 50 | /* This is a wrapper for localtime. It is used only on systems for which
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| 51 | gettimeofday clobbers the static buffer used for localtime's result.
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| 52 |
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| 53 | On the first call, record the address of the static buffer that
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| 54 | localtime uses for its result. */
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| 55 |
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| 56 | struct tm *
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| 57 | rpl_localtime (const time_t *timep)
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| 58 | {
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| 59 | struct tm *tm = localtime (timep);
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| 60 |
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| 61 | if (! localtime_buffer_addr)
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| 62 | localtime_buffer_addr = tm;
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| 63 |
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| 64 | return tm;
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| 65 | }
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| 66 |
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| 67 | /* Same as above, since gmtime and localtime use the same buffer. */
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| 68 | struct tm *
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| 69 | rpl_gmtime (const time_t *timep)
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| 70 | {
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| 71 | struct tm *tm = gmtime (timep);
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| 72 |
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| 73 | if (! localtime_buffer_addr)
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| 74 | localtime_buffer_addr = tm;
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| 75 |
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| 76 | return tm;
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| 77 | }
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| 78 |
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| 79 | /* This is a wrapper for gettimeofday. It is used only on systems for which
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| 80 | gettimeofday clobbers the static buffer used for localtime's result.
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| 81 |
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| 82 | Save and restore the contents of the buffer used for localtime's result
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| 83 | around the call to gettimeofday. */
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| 84 |
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| 85 | int
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| 86 | rpl_gettimeofday (struct timeval *tv, struct timezone *tz)
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| 87 | {
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| 88 | struct tm save;
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| 89 | int result;
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| 90 |
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| 91 | if (! localtime_buffer_addr)
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| 92 | {
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| 93 | time_t t = 0;
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| 94 | localtime_buffer_addr = localtime (&t);
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| 95 | }
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| 96 |
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| 97 | save = *localtime_buffer_addr;
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| 98 | result = gettimeofday (tv, tz);
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| 99 | *localtime_buffer_addr = save;
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| 100 |
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| 101 | return result;
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| 102 | }
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| 103 |
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| 104 | /* This is a wrapper for tzset. It is used only on systems for which
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| 105 | tzset may clobber the static buffer used for localtime's result.
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| 106 | Save and restore the contents of the buffer used for localtime's
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| 107 | result around the call to tzset. */
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| 108 | void
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| 109 | rpl_tzset (void)
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| 110 | {
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| 111 | struct tm save;
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| 112 |
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| 113 | if (! localtime_buffer_addr)
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| 114 | {
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| 115 | time_t t = 0;
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| 116 | localtime_buffer_addr = localtime (&t);
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| 117 | }
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| 118 |
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| 119 | save = *localtime_buffer_addr;
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| 120 | tzset ();
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| 121 | *localtime_buffer_addr = save;
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| 122 | }
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