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/*-

 * Copyright (c) 1990, 1993

 *      The Regents of the University of California.  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. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *      This product includes software developed by the University of

 *      California, Berkeley and its contributors.

 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.

 */

#if defined(LIBC_SCCS) && !defined(lint)

static char sccsid[] = "@(#)getsubopt.c 8.1 (Berkeley) 6/4/93";

#endif /* LIBC_SCCS and not lint */

#include <sys/cdefs.h>

#include <unistd.h>

#include <stdlib.h>

#include <string.h>

/*

 * The SVID interface to getsubopt provides no way of figuring out which

 * part of the suboptions list wasn't matched.  This makes error messages

 * tricky...  The extern variable suboptarg is a pointer to the token

 * which didn't match.

 */

char *suboptarg;

int

getsubopt(optionp, tokens, valuep)

        char **optionp, **valuep;

        char * const *tokens;

{

        int cnt;

        char *p;

        suboptarg = *valuep = NULL;

        if (!optionp || !*optionp)

                return(-1);

        /* skip leading white-space, commas */

        for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);

        if (!*p) {

                *optionp = p;

                return(-1);

        }

        /* save the start of the token, and skip the rest of the token. */

        for (suboptarg = p;

            *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);

        if (*p) {

                /*

                 * If there's an equals sign, set the value pointer, and

                 * skip over the value part of the token.  Terminate the

                 * token.

                 */

                if (*p == '=') {

                        *p = '\0';

                        for (*valuep = ++p;

                            *p && *p != ',' && *p != ' ' && *p != '\t'; ++p);

                        if (*p)

                                *p++ = '\0';

                } else

                        *p++ = '\0';

                /* Skip any whitespace or commas after this token. */

                for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);

        }

        /* set optionp for next round. */

        *optionp = p;

        for (cnt = 0; *tokens; ++tokens, ++cnt)

                if (!strcmp(suboptarg, *tokens))

                        return(cnt);

        return(-1);

}