/* Which POSIX version to conform to, for utilities.   Copyright (C) 2002 Free Software Foundation, Inc.   This program is free software; you can redistribute it and/or modify it   under the terms of the GNU Library 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   Library General Public License for more details.   You should have received a copy of the GNU Library General Public   License along with this program; if not, write to the Free Software   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,   USA.  *//* Written by Paul Eggert.  */#if HAVE_CONFIG_H# include <config.h>#endif#include <limits.h>#include <stdlib.h>#if !HAVE_DECL_GETENV && !defined getenvchar *getenv ();#endif#if HAVE_UNISTD_H# include <unistd.h>#endif#ifndef _POSIX2_VERSION# define _POSIX2_VERSION 0#endif/* The POSIX version that utilities should conform to.  The default is   specified by the system.  */intposix2_version (void){  long int v = _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;}