166 lines
3.9 KiB
C
166 lines
3.9 KiB
C
/* Copyright (C) 1992, 1995, 1996, 1997 Free Software Foundation, Inc.
|
|
This file based on setenv.c in the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#if HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#include "ansidecl.h"
|
|
#include <sys/types.h> /* For `size_t' */
|
|
#include <stdio.h> /* For `NULL' */
|
|
|
|
#include <errno.h>
|
|
#if !defined(errno) && !defined(HAVE_ERRNO_DECL)
|
|
extern int errno;
|
|
#endif
|
|
#define __set_errno(ev) ((errno) = (ev))
|
|
|
|
#if HAVE_STDLIB_H
|
|
# include <stdlib.h>
|
|
#endif
|
|
#if HAVE_STRING_H
|
|
# include <string.h>
|
|
#endif
|
|
#if HAVE_UNISTD_H
|
|
# include <unistd.h>
|
|
#endif
|
|
|
|
#define __environ environ
|
|
#ifndef HAVE_ENVIRON_DECL
|
|
extern char **environ;
|
|
#endif
|
|
|
|
/* LOCK and UNLOCK are defined as no-ops. This makes the libiberty
|
|
* implementation MT-Unsafe. */
|
|
#define LOCK
|
|
#define UNLOCK
|
|
|
|
/* Below this point, it's verbatim code from the glibc-2.0 implementation */
|
|
|
|
/* If this variable is not a null pointer we allocated the current
|
|
environment. */
|
|
static char **last_environ;
|
|
|
|
|
|
int
|
|
setenv (name, value, replace)
|
|
const char *name;
|
|
const char *value;
|
|
int replace;
|
|
{
|
|
register char **ep = 0;
|
|
register size_t size;
|
|
const size_t namelen = strlen (name);
|
|
const size_t vallen = strlen (value) + 1;
|
|
|
|
LOCK;
|
|
|
|
size = 0;
|
|
if (__environ != NULL)
|
|
{
|
|
for (ep = __environ; *ep != NULL; ++ep)
|
|
if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=')
|
|
break;
|
|
else
|
|
++size;
|
|
}
|
|
|
|
if (__environ == NULL || *ep == NULL)
|
|
{
|
|
char **new_environ;
|
|
if (__environ == last_environ && __environ != NULL)
|
|
/* We allocated this space; we can extend it. */
|
|
new_environ = (char **) realloc (last_environ,
|
|
(size + 2) * sizeof (char *));
|
|
else
|
|
new_environ = (char **) malloc ((size + 2) * sizeof (char *));
|
|
|
|
if (new_environ == NULL)
|
|
{
|
|
UNLOCK;
|
|
return -1;
|
|
}
|
|
|
|
new_environ[size] = malloc (namelen + 1 + vallen);
|
|
if (new_environ[size] == NULL)
|
|
{
|
|
free ((char *) new_environ);
|
|
__set_errno (ENOMEM);
|
|
UNLOCK;
|
|
return -1;
|
|
}
|
|
|
|
if (__environ != last_environ)
|
|
memcpy ((char *) new_environ, (char *) __environ,
|
|
size * sizeof (char *));
|
|
|
|
memcpy (new_environ[size], name, namelen);
|
|
new_environ[size][namelen] = '=';
|
|
memcpy (&new_environ[size][namelen + 1], value, vallen);
|
|
|
|
new_environ[size + 1] = NULL;
|
|
|
|
last_environ = __environ = new_environ;
|
|
}
|
|
else if (replace)
|
|
{
|
|
size_t len = strlen (*ep);
|
|
if (len + 1 < namelen + 1 + vallen)
|
|
{
|
|
/* The existing string is too short; malloc a new one. */
|
|
char *new = malloc (namelen + 1 + vallen);
|
|
if (new == NULL)
|
|
{
|
|
UNLOCK;
|
|
return -1;
|
|
}
|
|
*ep = new;
|
|
}
|
|
memcpy (*ep, name, namelen);
|
|
(*ep)[namelen] = '=';
|
|
memcpy (&(*ep)[namelen + 1], value, vallen);
|
|
}
|
|
|
|
UNLOCK;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
unsetenv (name)
|
|
const char *name;
|
|
{
|
|
const size_t len = strlen (name);
|
|
char **ep;
|
|
|
|
LOCK;
|
|
|
|
for (ep = __environ; *ep; ++ep)
|
|
if (!strncmp (*ep, name, len) && (*ep)[len] == '=')
|
|
{
|
|
/* Found it. Remove this pointer by moving later ones back. */
|
|
char **dp = ep;
|
|
do
|
|
dp[0] = dp[1];
|
|
while (*dp++);
|
|
/* Continue the loop in case NAME appears again. */
|
|
}
|
|
|
|
UNLOCK;
|
|
}
|