/*
 * 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 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */

#include <sys/types.h>
#include <ctype.h>
#include "libmail.h"

#define TRUE    1
#define FALSE   0

char **
setup_exec(char *s)
{
        char    *p = s, *q;
        static char     *argvec[256]; /* is this enough? */
        int     i = 0;
        int     stop;
        int     ignorespace = FALSE;

        /* Parse up string into arg. vec. for subsequent exec. Assume */
        /* whitespace delimits args. Any non-escaped double quotes will */
        /* be used to group multiple whitespace-delimited tokens into */
        /* a single exec arg. */
        p = skipspace(p);
        while (*p) {
                q = p;
                stop = FALSE;
                while (*q && (stop == FALSE)) {
                again:
                        switch (*q) {
                        case '\\':
                                /* Slide command string 1 char to left */
                                strmove(q, q+1);
                                break;
                        case '"':
                                ignorespace = ((ignorespace == TRUE) ?
                                    FALSE : TRUE);
                                /* Slide command string 1 char to left */
                                strmove(q, q+1);
                                goto again;
                        default:
                                if (isspace((int)*q) &&
                                    (ignorespace == FALSE)) {
                                        stop = TRUE;
                                        continue;
                                }
                                break;
                        }
                        q++;
                }
                if (*q == '\0') {
                        argvec[i++] = p;
                        break;
                }
                *q++ = '\0';
                argvec[i++] = p;
                p = skipspace(q);
        }
        argvec[i] = NULL;
        if (i == 0) {
                return (NULL);
        }
        return (argvec);
}