video2x/src/getopt.c

/*
 * 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. Neither the names of the copyright holders 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 COPYRIGHT HOLDERS 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 <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "getopt.h"

/*
extern int opterr;
extern int optind;
extern int optopt;
extern int optreset;
extern char *optarg;
*/

int opterr = 1;      /* 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 = NULL; /* argument associated with option */

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

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

static char *__progname(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(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(
    int nargc,
    char **nargv,
    const char *options,
    const 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, match = -1;
        size_t current_argv_len;

        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) == 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);
}