1 /* Which POSIX version to conform to, for utilities. 2 3 Copyright (C) 2002-2006, 2009-2018 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 3 of the License, or 8 (at your option) 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 16 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 17 18 /* Written by Paul Eggert. */ 19 20 #include <config.h> 21 22 #include "posixver.h" 23 24 #include <limits.h> 25 #include <stdlib.h> 26 27 #include <unistd.h> 28 #ifndef _POSIX2_VERSION 29 # define _POSIX2_VERSION 0 30 #endif 31 32 #ifndef DEFAULT_POSIX2_VERSION 33 # define DEFAULT_POSIX2_VERSION _POSIX2_VERSION 34 #endif 35 36 /* The POSIX version that utilities should conform to. The default is 37 specified by the system. */ 38 39 int posix2_version(void)40posix2_version (void) 41 { 42 long int v = DEFAULT_POSIX2_VERSION; 43 char const *s = getenv ("_POSIX2_VERSION"); 44 45 if (s && *s) 46 { 47 char *e; 48 long int i = strtol (s, &e, 10); 49 if (! *e) 50 v = i; 51 } 52 53 return v < INT_MIN ? INT_MIN : v < INT_MAX ? v : INT_MAX; 54 } 55