mirror of
https://github.com/coreutils/coreutils.git
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111 lines
2.8 KiB
C
111 lines
2.8 KiB
C
/* Copyright (C) 1991, 1994 Free Software Foundation, Inc.
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NOTE: The canonical source of this file is maintained with the GNU C Library.
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Bugs can be reported to bug-glibc@prep.ai.mit.edu.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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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/* Define-away any (possibly conflicting) prototype of putenv.
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Many systems omit the `const' attribute on the argument. */
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#define putenv _sys_putenv
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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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#undef putenv
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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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#if HAVE_GNU_LD
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# define environ __environ
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#else
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extern char **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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