/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 1994 Sun Microsystems, Inc. All rights reserved.
 * Use is subject to license terms.
 */


#include <stdlib.h>
#include <string.h>
#include <unistd.h>

extern  char    **environ;

static  short   setenv_made_new_vector= 0;

char *setenv(char *name, char *value)
{       char *p= NULL, **q;
        int length= 0, vl;

        if ((p= getenv(name)) == NULL) {        /* Allocate new vector */
                for (q= environ; *q != NULL; q++, length++);
                q= (char **)malloc((unsigned)(sizeof(char *)*(length+2)));
                memcpy(((char *)q)+sizeof(char *), (char *)environ, sizeof(char *)*(length+1));
                if (setenv_made_new_vector++)
                        free((char *)environ);
                length= strlen(name);
                environ= q;}
        else { /* Find old slot */
                length= strlen(name);
                for (q= environ; *q != NULL; q++)
                        if (!strncmp(*q, name, length))
                                break;};
        vl= strlen(value);
        if (!p || (length+vl+1 > strlen(p)))
                *q= p= (char *) malloc((unsigned)(length+vl+2));
        else
                p= *q;
        (void)strcpy(p, name); p+= length;
        *p++= '=';
        (void)strcpy(p, value);
        return(value);
}