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e2eaf477 ILT |
1 | /* Copyright (C) 1991, 1994, 1995, 1996 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., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
18 | ||
39423523 DD |
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 `=' is present the | |
26 | name is unset/removed. | |
27 | ||
28 | @end deftypefn | |
29 | ||
30 | */ | |
31 | ||
e2eaf477 ILT |
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 | #if HAVE_STDLIB_H | |
43 | # include <stdlib.h> | |
44 | #endif | |
45 | #if HAVE_STRING_H | |
46 | # include <string.h> | |
47 | #endif | |
48 | ||
49 | #ifdef HAVE_ALLOCA_H | |
50 | # include <alloca.h> | |
51 | #else | |
52 | # ifndef alloca | |
53 | # ifdef __GNUC__ | |
54 | # define alloca __builtin_alloca | |
55 | # else | |
56 | extern char *alloca (); | |
57 | # endif /* __GNUC__ */ | |
58 | # endif /* alloca */ | |
59 | #endif /* HAVE_ALLOCA_H */ | |
60 | ||
61 | /* Below this point, it's verbatim code from the glibc-2.0 implementation */ | |
62 | ||
63 | ||
64 | /* Put STRING, which is of the form "NAME=VALUE", in the environment. */ | |
65 | int | |
66 | putenv (string) | |
67 | const char *string; | |
68 | { | |
69 | const char *const name_end = strchr (string, '='); | |
70 | ||
71 | if (name_end) | |
72 | { | |
73 | char *name = (char *) alloca (name_end - string + 1); | |
74 | memcpy (name, string, name_end - string); | |
75 | name[name_end - string] = '\0'; | |
76 | return setenv (name, name_end + 1, 1); | |
77 | } | |
78 | ||
79 | unsetenv (string); | |
80 | return 0; | |
81 | } |