text: /* Which POSIX version to conform to, for utilities.
  
     Copyright (C) 2002-2006, 2009-2015 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/>.  */
  
  /* Written by Paul Eggert.  */
  
  #include <config.h>
  
  #include "posixver.h"
  
  #include <limits.h>
  #include <stdlib.h>
  
  #include <unistd.h>
  #ifndef _POSIX2_VERSION
  # define _POSIX2_VERSION 0
  #endif
  
  #ifndef DEFAULT_POSIX2_VERSION
  # define DEFAULT_POSIX2_VERSION _POSIX2_VERSION
  #endif
  
  /* The POSIX version that utilities should conform to.  The default is
     specified by the system.  */
  
  int
  posix2_version (void)
  {
    long int v = DEFAULT_POSIX2_VERSION;
    char const *s = getenv ("_POSIX2_VERSION");
  
    if (s && *s)
      {
        char *e;
        long int i = strtol (s, &e, 10);
        if (! *e)
          v = i;
      }
  
    return v < INT_MIN ? INT_MIN : v < INT_MAX ? v : INT_MAX;
  }
  