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