88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#if defined _AIX && !defined __GNUC__
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#pragma alloca
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#endif
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#if _LIBC || HAVE_STDLIB_H
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# include <stdlib.h>
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#endif
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#if _LIBC || HAVE_STRING_H
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# include <string.h>
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#endif
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#if !__GNU_LIBRARY__ && !HAVE_STRCHR
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# define strchr index
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#endif
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#ifndef _LIBC
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# ifdef HAVE_ALLOCA_H
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# include <alloca.h>
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# else
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# ifdef __GNUC__
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# define alloca __builtin_alloca
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# else
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extern char *alloca ();
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# endif /* __GNUC__ */
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# endif /* HAVE_ALLOCA_H */
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#endif /* _LIBC */
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/* Put STRING, which is of the form "NAME=VALUE", in the environment. */
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int
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putenv (char *string)
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{
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const char *const name_end = strchr (string, '=');
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if (name_end != NULL)
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{
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char *name;
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#ifdef _LIBC
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int use_malloc = !__libc_use_alloca (name_end - string + 1);
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if (__builtin_expect (use_malloc, 0))
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{
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name = __strndup (string, name_end - string);
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if (name == NULL)
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return -1;
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}
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else
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name = strndupa (string, name_end - string);
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#else
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# define use_malloc 1
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name = malloc (name_end - string + 1);
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if (name == NULL)
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return -1;
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memcpy (name, string, name_end - string);
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name[name_end - string] = '\0';
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#endif
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int result = __add_to_environ (name, NULL, string, 1);
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if (__glibc_unlikely (use_malloc))
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free (name);
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return result;
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}
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__unsetenv (string);
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return 0;
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}
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