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/*
* CU sudo version 1.5.4
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 1, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Please send bugs, changes, problems to sudo-bugs@courtesan.com
*
*******************************************************************
*
* This module contains putenv(3) for those systems that lack it.
*
* Todd C. Miller (millert@colorado.edu) Sun Aug 7 20:30:17 MDT 1994
*/
#ifndef lint
static char rcsid[] = "$Id: putenv.c,v 1.18 1998/01/13 04:48:42 millert Exp $";
#endif /* lint */
#include "config.h"
#include <stdio.h>
#ifdef STDC_HEADERS
#include <stdlib.h>
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
#include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif /* HAVE_STRINGS_H */
#if defined(HAVE_MALLOC_H) && !defined(STDC_HEADERS)
#include <malloc.h>
#endif /* HAVE_MALLOC_H && !STDC_HEADERS */
#include "compat.h"
#if !defined(STDC_HEADERS) && !defined(__GNUC__)
extern char *malloc __P((size_t));
#endif /* !STDC_HEADERS && !gcc */
/******************************************************************
*
* putenv()
*
* putenv(3) places a string of the for "name=value" into the environment.
* Note that this string becomes a part of the environment.
*/
int putenv(str)
const char *str;
{
char **current;
int matchlen, envlen=0;
char *tmp;
char **newenv;
static int first=1;
extern char ** environ;
/*
* find out how much of str to match when searching
* for a string to replace.
*/
if ((tmp = strchr(str, '=')) == NULL || tmp == str)
matchlen = strlen(str);
else
matchlen = (int) (tmp - str);
++matchlen;
/*
* Search for an existing string in the environment and find the
* length of environ. If found, replace and exit.
*/
for (current=environ; *current; current++) {
++envlen;
if (strncmp(str, *current, matchlen) == 0) {
/* found it, now insert the new version */
*current = (char *)str;
return(0);
}
}
/*
* There wasn't already a slot so add space for a new slot.
* If this is our first time through, use malloc(), else realloc().
*/
if (first) {
newenv = (char **) malloc(sizeof(char *) * (envlen + 2));
if (newenv == NULL)
return(-1);
first=0;
(void) memcpy(newenv, environ, sizeof(char *) * envlen);
} else {
newenv = (char **) realloc((char *)environ, sizeof(char *) * (envlen + 2));
if (newenv == NULL)
return(-1);
}
/* actually add in the new entry */
environ = newenv;
environ[envlen] = (char *)str;
environ[envlen+1] = NULL;
return(0);
}
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