kc3-lang/gnulib/lib/localtime-buffer.c

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• Hash : e4d101c4
  Author :
  Date : 2017-05-01T16:10:46
  

  New module 'localtime-buffer', split off from module 'gettimeofday'.
  
  * lib/localtime-buffer.h: New file.
  * lib/localtime-buffer.c: New file, extracted from lib/gettimeofday.c.
  * lib/time.in.h (tzset): New declaration.
  (localtime, gmtime): Don't test GNULIB_GETTIMEOFDAY.
  * lib/tzset.c: New file, extracted from lib/gettimeofday.c.
  * lib/gettimeofday.c: Include localtime-buffer.h. Remove code that was
  moved to lib/localtime-buffer.c or lib/tzset.c.
  * m4/localtime-buffer.m4: New file.
  * m4/time_h.m4 (gl_HEADER_TIME_H_DEFAULTS): Initialize GNULIB_TZSET,
  HAVE_TZSET, REPLACE_TZSET.
  * m4/tzset.m4 (gl_FUNC_TZSET): Move code from m4/gettimeofday.m4 to
  here, with modifications. Set HAVE_TZSET, REPLACE_TZSET. Invoke
  gl_LOCALTIME_BUFFER_NEEDED.
  (gl_FUNC_TZSET_CLOBBER): Don't require gl_HEADER_SYS_TIME_H; not needed
  since 2007-01-18.
  * m4/gettimeofday.m4 (gl_FUNC_GETTIMEOFDAY): Remove code that deals with
  tzset.
  (gl_FUNC_GETTIMEOFDAY_CLOBBER): Require gl_LOCALTIME_BUFFER_DEFAULTS.
  Invoke gl_LOCALTIME_BUFFER_NEEDED instead of
  gl_GETTIMEOFDAY_REPLACE_LOCALTIME.
  (gl_GETTIMEOFDAY_REPLACE_LOCALTIME): Remove macro.
  * modules/localtime-buffer: New file.
  * modules/time (Depends-on): Remove 'gettimeofday'.
  (Makefile.am): Substitute GNULIB_TZSET, HAVE_TZSET,
  REPLACE_TZSET. Don't substitute GNULIB_GETTIMEOFDAY.
  * modules/tzset (Description): Enable hyperlink to POSIX spec.
  (Files): Add lib/tzset.c.
  (Depends-on): Remove gettimeofday. Add localtime-buffer, time.
  (configure.ac): Arrange to conditionally compile lib/tzset.c. Invoke
  gl_TIME_MODULE_INDICATOR.
  * modules/gettimeofday (Depends-on): Add localtime-buffer.
  

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• lib/localtime-buffer.c

• /* Provide access to the last buffer returned by localtime() or gmtime().
  
     Copyright (C) 2001-2003, 2005-2007, 2009-2017 Free Software Foundation, Inc.
  
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2, or (at your option)
     any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program; if not, see <http://www.gnu.org/licenses/>.  */
  
  /* written by Jim Meyering */
  
  #include <config.h>
  
  /* Specification.  */
  #include "localtime-buffer.h"
  
  #if GETTIMEOFDAY_CLOBBERS_LOCALTIME || TZSET_CLOBBERS_LOCALTIME
  
  static struct tm tm_zero_buffer;
  struct tm *localtime_buffer_addr = &tm_zero_buffer;
  
  /* This is a wrapper for localtime.
  
     On the first call, record the address of the static buffer that
     localtime uses for its result.  */
  
  struct tm *
  rpl_localtime (time_t const *timep)
  {
    struct tm *tm = localtime (timep);
  
    if (localtime_buffer_addr == &tm_zero_buffer)
      localtime_buffer_addr = tm;
  
    return tm;
  }
  
  /* Same as above, since gmtime and localtime use the same buffer.  */
  struct tm *
  rpl_gmtime (time_t const *timep)
  {
    struct tm *tm = gmtime (timep);
  
    if (localtime_buffer_addr == &tm_zero_buffer)
      localtime_buffer_addr = tm;
  
    return tm;
  }
  
  #endif
  

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