text: /* Test of file timestamp modification functions.
     Copyright (C) 2009-2012 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 3 of the License, 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/>.  */
  
  /* This file defines some prerequisites useful to utime-related tests.  */
  
  #ifndef GL_TEST_UTIMENS_COMMON
  # define GL_TEST_UTIMENS_COMMON
  
  # include <fcntl.h>
  # include <errno.h>
  # include <string.h>
  # include <unistd.h>
  
  /* Gnulib modules.  */
  # include "stat-time.h"
  # include "timespec.h"
  # include "utimecmp.h"
  
  /* Gnulib test header.  */
  # include "nap.h"
  
  enum {
    BILLION = 1000 * 1000 * 1000,
  
    Y2K = 946684800, /* Jan 1, 2000, in seconds since epoch.  */
  
    /* Bogus positive and negative tv_nsec values closest to valid
       range, but without colliding with UTIME_NOW or UTIME_OMIT.  */
    UTIME_BOGUS_POS = BILLION + ((UTIME_NOW == BILLION || UTIME_OMIT == BILLION)
                                 ? (1 + (UTIME_NOW == BILLION + 1)
                                    + (UTIME_OMIT == BILLION + 1))
                                 : 0),
    UTIME_BOGUS_NEG = -1 - ((UTIME_NOW == -1 || UTIME_OMIT == -1)
                            ? (1 + (UTIME_NOW == -2) + (UTIME_OMIT == -2))
                            : 0)
  };
  
  # if (defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__
  /* Skip ctime tests on native Windows, since it is either a copy of
     mtime or birth time (depending on the file system), rather than a
     properly tracked change time.  */
  #  define check_ctime 0
  # else
  #  define check_ctime 1
  # endif
  
  /* Compare two st_ctime values.  Return -1, 0 or 1, respectively
     when A's st_ctime is smaller than, equal to or greater than B's.  */
  static inline int
  ctime_compare (struct stat const *a, struct stat const *b)
  {
    if (a->st_ctime < b->st_ctime)
      return -1;
    else if (b->st_ctime < a->st_ctime)
      return 1;
    else if (get_stat_ctime_ns (a) < get_stat_ctime_ns (b))
      return -1;
    else if (get_stat_ctime_ns (b) < get_stat_ctime_ns (a))
      return 1;
    else
      return 0;
  }
  
  #endif /* GL_TEST_UTIMENS_COMMON */
  