root/libde265-1.0.3/extra/getopt_long.c

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DEFINITIONS

This source file includes following definitions.
  1. __progname
  2. getopt_internal
  3. getopt2
  4. getopt_long

/*
 * 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"

extern int        opterr;       /* if error message should be printed */
extern int        optind;       /* index into parent argv vector */
extern int        optopt;       /* character checked for validity */
extern int        optreset;     /* reset getopt */
extern 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(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 ** nargv, const char *ostr)
{
        static char *place = EMSG;              /* option letter processing */
        const 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(int nargc, char * 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, 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);
}

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