154 lines
3.5 KiB
C
154 lines
3.5 KiB
C
/* Copyright (C) 1992, 1995, 1996 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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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <errno.h>
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#if _LIBC || HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#if _LIBC || HAVE_STRING_H
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#include <string.h>
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#endif
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#if _LIBC || HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if _LIBC - 0 == 0
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#define __environ environ
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#endif
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#if _LIBC - 0
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/* This lock protects against simultaneous modifications of `environ'. */
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#include <libc-lock.h>
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__libc_lock_define_initialized (static, envlock)
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#define LOCK __libc_lock_lock (envlock)
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#define UNLOCK __libc_lock_unlock (envlock)
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#else
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#define LOCK
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#define UNLOCK
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#endif
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int
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setenv (name, value, replace)
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const char *name;
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const char *value;
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int replace;
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{
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register char **ep;
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register size_t size;
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const size_t namelen = strlen (name);
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const size_t vallen = strlen (value) + 1;
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LOCK;
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size = 0;
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for (ep = __environ; *ep != NULL; ++ep)
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if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=')
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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;
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char **new_environ;
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if (__environ == last_environ)
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/* We allocated this space; we can extend it. */
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new_environ = (char **) realloc (last_environ,
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(size + 2) * sizeof (char *));
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else
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new_environ = (char **) malloc ((size + 2) * sizeof (char *));
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if (new_environ == NULL)
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{
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UNLOCK;
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return -1;
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}
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new_environ[size] = malloc (namelen + 1 + vallen);
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if (new_environ[size] == NULL)
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{
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free ((char *) new_environ);
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__set_errno (ENOMEM);
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UNLOCK;
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return -1;
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}
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if (__environ != last_environ)
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memcpy ((char *) new_environ, (char *) __environ,
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size * sizeof (char *));
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memcpy (new_environ[size], name, namelen);
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new_environ[size][namelen] = '=';
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memcpy (&new_environ[size][namelen + 1], value, vallen);
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new_environ[size + 1] = NULL;
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last_environ = __environ = new_environ;
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}
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else if (replace)
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{
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size_t len = strlen (*ep);
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if (len + 1 < namelen + 1 + vallen)
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{
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/* The existing string is too short; malloc a new one. */
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char *new = malloc (namelen + 1 + vallen);
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if (new == NULL)
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{
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UNLOCK;
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return -1;
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}
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*ep = new;
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}
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memcpy (*ep, name, namelen);
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(*ep)[namelen] = '=';
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memcpy (&(*ep)[namelen + 1], value, vallen);
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}
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UNLOCK;
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return 0;
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}
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void
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unsetenv (name)
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const char *name;
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{
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const size_t len = strlen (name);
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char **ep;
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LOCK;
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for (ep = __environ; *ep; ++ep)
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if (!strncmp (*ep, name, len) && (*ep)[len] == '=')
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{
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/* Found it. Remove this pointer by moving later ones back. */
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char **dp = ep;
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do
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dp[0] = dp[1];
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while (*dp++);
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/* Continue the loop in case NAME appears again. */
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}
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UNLOCK;
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}
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