77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
/*
|
|
* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
|
|
* (Royal Institute of Technology, Stockholm, Sweden).
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
RCSID("$Id: putenv.c,v 1.6 1999/12/02 16:58:51 joda Exp $");
|
|
#endif
|
|
|
|
#include <stdlib.h>
|
|
|
|
extern char **environ;
|
|
|
|
/*
|
|
* putenv --
|
|
* String points to a string of the form name=value.
|
|
*
|
|
* Makes the value of the environment variable name equal to
|
|
* value by altering an existing variable or creating a new one.
|
|
*/
|
|
int putenv(const char *string)
|
|
{
|
|
int i;
|
|
int len;
|
|
|
|
len = string - strchr(string, '=') + 1;
|
|
|
|
if(environ == NULL){
|
|
environ = malloc(sizeof(char*));
|
|
if(environ == NULL)
|
|
return 1;
|
|
environ[0] = NULL;
|
|
}
|
|
|
|
for(i = 0; environ[i]; i++)
|
|
if(strncmp(string, environ[i], len)){
|
|
environ[len] = string;
|
|
return 0;
|
|
}
|
|
environ = realloc(environ, sizeof(char*) * (i + 1));
|
|
if(environ == NULL)
|
|
return 1;
|
|
environ[i] = string;
|
|
environ[i+1] = NULL;
|
|
return 0;
|
|
}
|
|
|