1/* Which POSIX version to conform to, for utilities. 2 3 Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 2, or (at your option) 8 any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License along 16 with this program; if not, write to the Free Software Foundation, 17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ 18 19/* Written by Paul Eggert. */ 20 21#ifdef HAVE_CONFIG_H 22# include <config.h> 23#endif 24 25#include "posixver.h" 26 27#include <limits.h> 28#include <stdlib.h> 29 30#include <unistd.h> 31#ifndef _POSIX2_VERSION 32# define _POSIX2_VERSION 0 33#endif 34 35#ifndef DEFAULT_POSIX2_VERSION 36# define DEFAULT_POSIX2_VERSION _POSIX2_VERSION 37#endif 38 39/* The POSIX version that utilities should conform to. The default is 40 specified by the system. */ 41 42int 43posix2_version (void) 44{ 45 long int v = DEFAULT_POSIX2_VERSION; 46 char const *s = getenv ("_POSIX2_VERSION"); 47 48 if (s && *s) 49 { 50 char *e; 51 long int i = strtol (s, &e, 10); 52 if (! *e) 53 v = i; 54 } 55 56 return v < INT_MIN ? INT_MIN : v < INT_MAX ? v : INT_MAX; 57} 58