| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* Copyright (C) 1991-2015 Free Software Foundation, Inc. |
| 2 | This file is part of 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 Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the 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 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, see |
| 16 | <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #if defined _AIX && !defined __GNUC__ |
| 19 | #pragma alloca |
| 20 | #endif |
| 21 | |
| 22 | #if HAVE_CONFIG_H |
| 23 | # include <config.h> |
| 24 | #endif |
| 25 | |
| 26 | #if _LIBC || HAVE_STDLIB_H |
| 27 | # include <stdlib.h> |
| 28 | #endif |
| 29 | #if _LIBC || HAVE_STRING_H |
| 30 | # include <string.h> |
| 31 | #endif |
| 32 | |
| 33 | #if !__GNU_LIBRARY__ && !HAVE_STRCHR |
| 34 | # define strchr index |
| 35 | #endif |
| 36 | |
| 37 | #ifndef _LIBC |
| 38 | # ifdef HAVE_ALLOCA_H |
| 39 | # include <alloca.h> |
| 40 | # else |
| 41 | # ifdef __GNUC__ |
| 42 | # define alloca __builtin_alloca |
| 43 | # else |
| 44 | extern char *alloca (); |
| 45 | # endif /* __GNUC__ */ |
| 46 | # endif /* HAVE_ALLOCA_H */ |
| 47 | #endif /* _LIBC */ |
| 48 | |
| 49 | |
| 50 | /* Put STRING, which is of the form "NAME=VALUE", in the environment. */ |
| 51 | int |
| 52 | putenv (string) |
| 53 | char *string; |
| 54 | { |
| 55 | const char *const name_end = strchr (string, '='); |
| 56 | |
| 57 | if (name_end != NULL) |
| 58 | { |
| 59 | char *name; |
| 60 | #ifdef _LIBC |
| 61 | int use_malloc = !__libc_use_alloca (name_end - string + 1); |
| 62 | if (__builtin_expect (use_malloc, 0)) |
| 63 | { |
| 64 | name = strndup (string, name_end - string); |
| 65 | if (name == NULL) |
| 66 | return -1; |
| 67 | } |
| 68 | else |
| 69 | name = strndupa (string, name_end - string); |
| 70 | #else |
| 71 | # define use_malloc 1 |
| 72 | name = malloc (name_end - string + 1); |
| 73 | if (name == NULL) |
| 74 | return -1; |
| 75 | memcpy (name, string, name_end - string); |
| 76 | name[name_end - string] = '\0'; |
| 77 | #endif |
| 78 | int result = __add_to_environ (name, NULL, string, 1); |
| 79 | |
| 80 | if (__glibc_unlikely (use_malloc)) |
| 81 | free (name); |
| 82 | |
| 83 | return result; |
| 84 | } |
| 85 | |
| 86 | __unsetenv (string); |
| 87 | return 0; |
| 88 | } |