1 /* Which POSIX version to conform to, for utilities. 2 3 Copyright (C) 2002, 2003, 2004 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 18 19 /* Written by Paul Eggert. */ 20 21 #if 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 #if HAVE_UNISTD_H 31 # include <unistd.h> 32 #endif 33 #ifndef _POSIX2_VERSION 34 # define _POSIX2_VERSION 0 35 #endif 36 37 #ifndef DEFAULT_POSIX2_VERSION 38 # define DEFAULT_POSIX2_VERSION _POSIX2_VERSION 39 #endif 40 41 /* The POSIX version that utilities should conform to. The default is 42 specified by the system. */ 43 44 int 45 posix2_version (void) 46 { 47 long int v = DEFAULT_POSIX2_VERSION; 48 char const *s = getenv ("_POSIX2_VERSION"); 49 50 if (s && *s) 51 { 52 char *e; 53 long int i = strtol (s, &e, 10); 54 if (! *e) 55 v = i; 56 } 57 58 return v < INT_MIN ? INT_MIN : v < INT_MAX ? v : INT_MAX; 59 } 60