putenv.c revision 1.1
1/* Copyright (C) 1991, 1994, 1995, 1996, 2002 Free Software Foundation, Inc. 2 This file based on putenv.c in the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Library General Public License as 6 published by the Free Software Foundation; either version 2 of the 7 License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Library General Public License for more details. 13 14 You should have received a copy of the GNU Library General Public 15 License along with the GNU C Library; see the file COPYING.LIB. If not, 16 write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, 17 Boston, MA 02110-1301, USA. */ 18 19/* 20 21@deftypefn Supplemental int putenv (const char *@var{string}) 22 23Uses @code{setenv} or @code{unsetenv} to put @var{string} into 24the environment or remove it. If @var{string} is of the form 25@samp{name=value} the string is added; if no @samp{=} is present the 26name is unset/removed. 27 28@end deftypefn 29 30*/ 31 32#if defined (_AIX) && !defined (__GNUC__) 33 #pragma alloca 34#endif 35 36#if HAVE_CONFIG_H 37# include <config.h> 38#endif 39 40#include "ansidecl.h" 41 42#define putenv libiberty_putenv 43 44#if HAVE_STDLIB_H 45# include <stdlib.h> 46#endif 47#if HAVE_STRING_H 48# include <string.h> 49#endif 50 51#ifdef HAVE_ALLOCA_H 52# include <alloca.h> 53#else 54# ifndef alloca 55# ifdef __GNUC__ 56# define alloca __builtin_alloca 57# else 58extern char *alloca (); 59# endif /* __GNUC__ */ 60# endif /* alloca */ 61#endif /* HAVE_ALLOCA_H */ 62 63#undef putenv 64 65/* Below this point, it's verbatim code from the glibc-2.0 implementation */ 66 67 68/* Put STRING, which is of the form "NAME=VALUE", in the environment. */ 69int 70putenv (const char *string) 71{ 72 const char *const name_end = strchr (string, '='); 73 74 if (name_end) 75 { 76 char *name = (char *) alloca (name_end - string + 1); 77 memcpy (name, string, name_end - string); 78 name[name_end - string] = '\0'; 79 return setenv (name, name_end + 1, 1); 80 } 81 82 unsetenv (string); 83 return 0; 84} 85