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/* RCS $Id: putenv.c,v 1.1.1.1 2000-09-22 15:33:35 hr Exp $
--
-- SYNOPSIS
-- My own putenv for BSD like systems.
--
-- DESCRIPTION
-- This originally came from MKS, but I rewrote it to fix a bug with
-- replacing existing strings, probably never happened but the code
-- was wrong nonetheless.
--
-- AUTHOR
-- Dennis Vadura, dvadura@dmake.wticorp.com
--
-- WWW
-- http://dmake.wticorp.com/
--
-- COPYRIGHT
-- Copyright (c) 1996,1997 by WTI Corp. All rights reserved.
--
-- This program is NOT free software; you can redistribute it and/or
-- modify it under the terms of the Software License Agreement Provided
-- in the file <distribution-root>/readme/license.txt.
--
-- LOG
-- Use cvs log to obtain detailed change logs.
*/
#include <stdio.h>
#include <string.h>
int
putenv( str )/*
===============
Take a string of the form NAME=value and stick it into the environment.
We do this by allocating a new set of pointers if we have to add a new
string and by replacing an existing pointer if the value replaces the value
of an existing string. */
char *str;
{
extern char **environ; /* The current environment. */
static char **ourenv = NULL; /* A new environment */
register char **p;
register char *q;
int size;
/* First search the current environment and see if we can replace a
* string. */
for( p=environ; *p; p++ ) {
register char *s = str;
for( q = *p; *q && *s && *s == *q; q++, s++ )
if( *s == '=' ) {
*p = str;
return(0); /* replaced it so go away */
}
}
/* Ok, can't replace a string so need to grow the environment. */
size = p - environ + 2; /* size of new environment */
/* size of old is size-1 */
/* It's the first time, so allocate a new environment since we don't know
* where the old one is comming from. */
if( ourenv == NULL ) {
if( (ourenv = (char **) malloc( sizeof(char *)*size )) == NULL )
return(1);
memcpy( (char *)ourenv, (char *)environ, (size-2)*sizeof(char *) );
}
else if( (ourenv = (char **)realloc( ourenv, size*sizeof(char *))) == NULL )
return(1);
ourenv[--size] = NULL;
ourenv[--size] = str;
environ = ourenv;
return(0);
}
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