| /* Copyright (C) 1991-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #if defined _AIX && !defined __GNUC__ |
| #pragma alloca |
| #endif |
| |
| #if HAVE_CONFIG_H |
| # include <config.h> |
| #endif |
| |
| #if _LIBC || HAVE_STDLIB_H |
| # include <stdlib.h> |
| #endif |
| #if _LIBC || HAVE_STRING_H |
| # include <string.h> |
| #endif |
| |
| #if !__GNU_LIBRARY__ && !HAVE_STRCHR |
| # define strchr index |
| #endif |
| |
| #ifndef _LIBC |
| # ifdef HAVE_ALLOCA_H |
| # include <alloca.h> |
| # else |
| # ifdef __GNUC__ |
| # define alloca __builtin_alloca |
| # else |
| extern char *alloca (); |
| # endif /* __GNUC__ */ |
| # endif /* HAVE_ALLOCA_H */ |
| #endif /* _LIBC */ |
| |
| |
| /* Put STRING, which is of the form "NAME=VALUE", in the environment. */ |
| int |
| putenv (char *string) |
| { |
| const char *const name_end = strchr (string, '='); |
| |
| if (name_end != NULL) |
| { |
| char *name; |
| #ifdef _LIBC |
| int use_malloc = !__libc_use_alloca (name_end - string + 1); |
| if (__builtin_expect (use_malloc, 0)) |
| { |
| name = __strndup (string, name_end - string); |
| if (name == NULL) |
| return -1; |
| } |
| else |
| name = strndupa (string, name_end - string); |
| #else |
| # define use_malloc 1 |
| name = malloc (name_end - string + 1); |
| if (name == NULL) |
| return -1; |
| memcpy (name, string, name_end - string); |
| name[name_end - string] = '\0'; |
| #endif |
| int result = __add_to_environ (name, NULL, string, 1); |
| |
| if (__glibc_unlikely (use_malloc)) |
| free (name); |
| |
| return result; |
| } |
| |
| __unsetenv (string); |
| return 0; |
| } |