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/* Copyright (C) 1991, 1994, 1995, 1996, 2002 Free Software Foundation, Inc.

   This file based on putenv.c in 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 Library General Public License as

   published by the Free Software Foundation; either version 2 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

   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public

   License along with the GNU C Library; see the file COPYING.LIB.  If not,

   write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,

   Boston, MA 02110-1301, USA.  */

/*

@deftypefn Supplemental int putenv (const char *@var{string})

Uses @code{setenv} or @code{unsetenv} to put @var{string} into

the environment or remove it.  If @var{string} is of the form

@samp{name=value} the string is added; if no @samp{=} is present the

name is unset/removed.

@end deftypefn

*/

#if defined (_AIX) && !defined (__GNUC__)

 #pragma alloca

#endif

#if HAVE_CONFIG_H

# include <config.h>

#endif

#include "ansidecl.h"

#define putenv libiberty_putenv

#if HAVE_STDLIB_H

# include <stdlib.h>

#endif

#if HAVE_STRING_H

# include <string.h>

#endif

#ifdef HAVE_ALLOCA_H

# include <alloca.h>

#else

# ifndef alloca

#  ifdef __GNUC__

#   define alloca __builtin_alloca

#  else

extern char *alloca ();

#  endif /* __GNUC__ */

# endif /* alloca */

#endif /* HAVE_ALLOCA_H */

#undef putenv

/* Below this point, it's verbatim code from the glibc-2.0 implementation */

/* Put STRING, which is of the form "NAME=VALUE", in the environment.  */

int

putenv (const char *string)

{

  const char *const name_end = strchr (string, '=');

  if (name_end)

    {

      char *name = (char *) alloca (name_end - string + 1);

      memcpy (name, string, name_end - string);

      name[name_end - string] = '\0';

      return setenv (name, name_end + 1, 1);

    }

  unsetenv (string);

  return 0;

}