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/* Copyright (C) 1991, 2000, 2001, 2004, 2005, 2006 Free Software Foundation, Inc.
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include "libguile/scmconfig.h"
#include <sys/types.h>
#include <errno.h>
/* Don't include stdlib.h for non-GNU C libraries because some of them
contain conflicting prototypes for getopt.
This needs to come after some library #include
to get __GNU_LIBRARY__ defined. */
#ifdef __GNU_LIBRARY__
#include <stdlib.h>
#else
char *malloc ();
#endif /* GNU C library. */
#if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
#include <string.h>
#else
#include <strings.h>
#ifndef strchr
#define strchr index
#endif
#ifndef memcpy
#define memcpy(d, s, n) bcopy((s), (d), (n))
#endif
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_CRT_EXTERNS_H
#include <crt_externs.h> /* for Darwin _NSGetEnviron */
#endif
#ifndef NULL
#define NULL 0
#endif
extern char **environ;
/* On Apple Darwin in a shared library there's no "environ" to access
directly, instead the address of that variable must be obtained with
_NSGetEnviron(). */
#if HAVE__NSGETENVIRON && defined (PIC)
#define environ (*_NSGetEnviron())
#endif
/* Put STRING, which is of the form "NAME=VALUE", in the environment. */
int
putenv (const char *string)
{
char *name_end = strchr (string, '=');
register size_t size;
register char **ep;
if (name_end == NULL)
{
/* Remove the variable from the environment. */
size = strlen (string);
for (ep = environ; *ep != NULL; ++ep)
if (!strncmp (*ep, string, size) && (*ep)[size] == '=')
{
while (ep[1] != NULL)
{
ep[0] = ep[1];
++ep;
}
*ep = NULL;
return 0;
}
}
size = 0;
for (ep = environ; *ep != NULL; ++ep)
if (!strncmp (*ep, string, name_end - string) &&
(*ep)[name_end - string] == '=')
break;
else
++size;
if (*ep == NULL)
{
static char **last_environ = NULL;
char **new_environ = (char **) scm_malloc ((size + 2) * sizeof (char *));
memcpy ((char *) new_environ, (char *) environ, size * sizeof (char *));
new_environ[size] = (char *) string;
new_environ[size + 1] = NULL;
if (last_environ != NULL)
free ((char *) last_environ);
last_environ = new_environ;
environ = new_environ;
}
else
*ep = (char *) string;
return 0;
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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