common/libstand/getopt.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sys/salib.h>

#define EOF (-1)

int opterr = 1, optind = 1, optopt = 0;
char *optarg = NULL;
int _sp = 1;

extern void warn(const char *, ...);

void
getopt_reset(void)
{
    opterr = 1;
    optind = 1;
    optopt = 0;
    optarg = NULL;
    _sp = 1;
}

int
getopt(int argc, char *const *argv, const char *opts)
{
    char c;
    char *cp;

    if (_sp == 1) {
        if (optind >= argc || argv[optind][0] != '-' ||
            argv[optind] == NULL || argv[optind][1] == '\0')
            return (EOF);
        else if (strcmp(argv[optind], "--") == NULL) {
            optind++;
            return (EOF);
        }
    }
    optopt = c = (unsigned char)argv[optind][_sp];
    if (c == ':' || (cp = strchr(opts, c)) == NULL) {
        if (opts[0] != ':')
            warn("%s: illegal option -- %c\n", argv[0], c);
        if (argv[optind][++_sp] == '\0') {
            optind++;
            _sp = 1;
        }
        return ('?');
    }

    if (*(cp + 1) == ':') {
        if (argv[optind][_sp+1] != '\0')
            optarg = &argv[optind++][_sp+1];
        else if (++optind >= argc) {
            if (opts[0] != ':') {
                warn("%s: option requires an argument"
                    " -- %c\n", argv[0], c);
            }
            _sp = 1;
            optarg = NULL;
            return (opts[0] == ':' ? ':' : '?');
        } else
            optarg = argv[optind++];
        _sp = 1;
    } else {
        if (argv[optind][++_sp] == '\0') {
            _sp = 1;
            optind++;
        }
        optarg = NULL;
    }
    return (c);
}