1 /* Provide access to the last buffer returned by localtime() or gmtime(). 2 3 Copyright (C) 2001-2003, 2005-2007, 2009-2018 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 61