102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
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/* Copyright (C) 1991, 1994 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <errno.h>
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#if defined (__GNU_LIBRARY__) || defined (HAVE_STDLIB_H)
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#include <stdlib.h>
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#endif
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#if defined (__GNU_LIBRARY__) || defined (HAVE_STRING_H)
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#include <string.h>
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#endif
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#if defined (__GNU_LIBRARY__) || defined (HAVE_UNISTD_H)
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#include <unistd.h>
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#endif
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#if !defined (__GNU_LIBRARY__) && !defined (HAVE_STRCHR)
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#define strchr index
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#endif
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#if !defined (__GNU_LIBRARY__) && !defined (HAVE_MEMCPY)
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#define memcpy(d,s,n) bcopy ((s), (d), (n))
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#endif
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#ifndef HAVE_GNU_LD
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#define __environ environ
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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 (string)
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const char *string;
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{
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const char *const 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 **) malloc ((size + 2) * sizeof (char *));
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if (new_environ == NULL)
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return -1;
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(void) memcpy ((void *) new_environ, (void *) __environ,
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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 ((void *) 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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