| 1 | /* Copyright (C) 1991-2019 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 | |
| 23 | Uses @code{setenv} or @code{unsetenv} to put @var{string} into |
| 24 | the 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 |
| 26 | name 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 |
| 58 | extern 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. */ |
| 69 | int |
| 70 | putenv (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 | } |