vs12/getopt.c

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/*
 * Copyright (c) 1987, 1993, 1994, 1996
 *  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.
 */
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "getopt.h"

int   opterr = 0;   /* if error message should be printed */
int   optind = 1;   /* index into parent argv vector */
int   optopt = 0;   /* character checked for validity */
int   optreset = 0; /* reset getopt */
char *optarg;   /* argument associated with option */

#define __P(x) x
#define _DIAGASSERT(x) assert(x)

static char * __progname __P((char *));
int getopt_internal __P((int, char * const *, const char *));

static char *
__progname(nargv0)
    char * nargv0;
{
    char * tmp;

    _DIAGASSERT(nargv0 != NULL);

    tmp = strrchr(nargv0, '/');
    if (tmp)
        tmp++;
    else
        tmp = nargv0;
    return(tmp);
}

#define BADCH   (int)'?'
#define BADARG  (int)':'
#define EMSG    ""

/*
 * getopt --
 *  Parse argc/argv argument vector.
 */
int
getopt_internal(nargc, nargv, ostr)
    int nargc;
    char * const *nargv;
    const char *ostr;
{
    static char *place = EMSG;      /* option letter processing */
    char *oli;              /* option letter list index */

    _DIAGASSERT(nargv != NULL);
    _DIAGASSERT(ostr != NULL);

    if (optreset || !*place) {      /* update scanning pointer */
        optreset = 0;
        if (optind >= nargc || *(place = nargv[optind]) != '-') {
            place = EMSG;
            return (-1);
        }
        if (place[1] && *++place == '-') {  /* found "--" */
            /* ++optind; */
            place = EMSG;
            return (-2);
        }
    }                   /* option letter okay? */
    if ((optopt = (int)*place++) == (int)':' ||
        !(oli = strchr(ostr, optopt))) {
        /*
         * if the user didn't specify '-' as an option,
         * assume it means -1.
         */
        if (optopt == (int)'-')
            return (-1);
        if (!*place)
            ++optind;
        if (opterr && *ostr != ':')
            (void)fprintf(stderr,
                "%s: illegal option -- %c\n", __progname(nargv[0]), optopt);
        return (BADCH);
    }
    if (*++oli != ':') {            /* don't need argument */
        optarg = NULL;
        if (!*place)
            ++optind;
    } else {                /* need an argument */
        if (*place)         /* no white space */
            optarg = place;
        else if (nargc <= ++optind) {   /* no arg */
            place = EMSG;
            if ((opterr) && (*ostr != ':'))
                (void)fprintf(stderr,
                    "%s: option requires an argument -- %c\n",
                    __progname(nargv[0]), optopt);
            return (BADARG);
        } else              /* white space */
            optarg = nargv[optind];
        place = EMSG;
        ++optind;
    }
    return (optopt);            /* dump back option letter */
}

#if 0
/*
 * getopt --
 *  Parse argc/argv argument vector.
 */
int
getopt2(nargc, nargv, ostr)
    int nargc;
    char * const *nargv;
    const char *ostr;
{
    int retval;

    if ((retval = getopt_internal(nargc, nargv, ostr)) == -2) {
        retval = -1;
        ++optind; 
    }
    return(retval);
}
#endif

/*
 * getopt_long --
 *  Parse argc/argv argument vector.
 */
int
getopt_long(nargc, nargv, options, long_options, index)
    int nargc;
    char ** nargv;
    char * options;
    struct option * long_options;
    int * index;
{
    int retval;

    _DIAGASSERT(nargv != NULL);
    _DIAGASSERT(options != NULL);
    _DIAGASSERT(long_options != NULL);
    /* index may be NULL */

    if ((retval = getopt_internal(nargc, nargv, options)) == -2) {
        char *current_argv = nargv[optind++] + 2, *has_equal;
        int i, current_argv_len, match = -1;

        if (*current_argv == '\0') {
            return(-1);
        }
        if ((has_equal = strchr(current_argv, '=')) != NULL) {
            current_argv_len = has_equal - current_argv;
            has_equal++;
        } else
            current_argv_len = strlen(current_argv);

        for (i = 0; long_options[i].name; i++) { 
            if (strncmp(current_argv, long_options[i].name, current_argv_len))
                continue;

            if (strlen(long_options[i].name) == (unsigned)current_argv_len) { 
                match = i;
                break;
            }
            if (match == -1)
                match = i;
        }
        if (match != -1) {
            if (long_options[match].has_arg == required_argument ||
                long_options[match].has_arg == optional_argument) {
                if (has_equal)
                    optarg = has_equal;
                else
                    optarg = nargv[optind++];
            }
            if ((long_options[match].has_arg == required_argument)
                && (optarg == NULL)) {
                /*
                 * Missing argument, leading :
                 * indicates no error should be generated
                 */
                if ((opterr) && (*options != ':'))
                    (void)fprintf(stderr,
                      "%s: option requires an argument -- %s\n",
                      __progname(nargv[0]), current_argv);
                return (BADARG);
            }
        } else { /* No matching argument */
            if ((opterr) && (*options != ':'))
                (void)fprintf(stderr,
                    "%s: illegal option -- %s\n", __progname(nargv[0]), current_argv);
            return (BADCH);
        }
        if (long_options[match].flag) {
            *long_options[match].flag = long_options[match].val;
            retval = 0;
        } else 
            retval = long_options[match].val;
        if (index)
            *index = match;
    }
    return(retval);
}