gnu/dist/diffutils/lib/posixver.c

   1 /*      $NetBSD$        */
   2
   3 /* Which POSIX version to conform to, for utilities.
   4
   5    Copyright (C) 2002 Free Software Foundation, Inc.
   6
   7    This program is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU Library General Public License as published
   9    by the Free Software Foundation; either version 2, or (at your option)
  10    any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library General Public
  18    License along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  20    USA.  */
  21
  22 /* Written by Paul Eggert.  */
  23
  24 #if HAVE_CONFIG_H
  25 # include <config.h>
  26 #endif
  27
  28 #include <limits.h>
  29
  30 #include <stdlib.h>
  31 #if !HAVE_DECL_GETENV && !defined getenv
  32 char *getenv ();
  33 #endif
  34
  35 #if HAVE_UNISTD_H
  36 # include <unistd.h>
  37 #endif
  38 #ifndef _POSIX2_VERSION
  39 # define _POSIX2_VERSION 0
  40 #endif
  41
  42 /* The POSIX version that utilities should conform to.  The default is
  43    specified by the system.  */
  44
  45 int
  46 posix2_version (void)
  47 {
  48   long int v = _POSIX2_VERSION;
  49   char const *s = getenv ("_POSIX2_VERSION");
  50
  51   if (s && *s)
  52     {
  53       char *e;
  54       long int i = strtol (s, &e, 10);
  55       if (! *e)
  56         v = i;
  57     }
  58
  59   return v < INT_MIN ? INT_MIN : v < INT_MAX ? v : INT_MAX;
  60 }