src/external/getopt.c - master - niceSOFT/libssh

src/external/getopt.c
134 строки5 KB
Mingyuan Li
options: Add bundled getopt implementation from FreeBSD
24 мар 2026, 17:11
24 мар 2026, 17:11d2f7994
/*	$NetBSD: getopt.c,v 1.29 2014/06/05 22:00:22 christos Exp $	*/

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1987, 1993, 1994
 *	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 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.
 */

/*
 * Adapted for libssh: removed FreeBSD internal headers (namespace.h,
 * un-namespace.h, libc_private.h, unistd.h) and replaced _getprogname()
 * with nargv[0] for portability on platforms lacking getopt (e.g. MSVC).
 */

#include <stdio.h>
#include <string.h>

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

#define BADCH  (int)'?'
#define BADARG (int)':'
static char EMSG[] = "";
/*
 * getopt --
 *	Parse argc/argv argument vector.
 */
int getopt(int nargc, char *const nargv[], const char *ostr);

int getopt(int nargc, char *const nargv[], const char *ostr)
{
    static char *place = EMSG; /* option letter processing */
    char *oli = NULL;          /* option letter list index */

    if (optreset || *place == 0) { /* update scanning pointer */
        optreset = 0;
        if (optind >= nargc || *(place = nargv[optind]) != '-') {
            /* Argument is absent or is not an option */
            place = EMSG;
            return (-1);
        }
        place++;
        optopt = *place++;
        if (optopt == '-' && *place == 0) {
            /* "--" => end of options */
            ++optind;
            place = EMSG;
            return (-1);
        }
        if (optopt == 0) {
            /* Solitary '-', treat as a '-' option
               if the program (eg su) is looking for it. */
            place = EMSG;
            if (strchr(ostr, '-') == NULL)
                return (-1);
            optopt = '-';
        }
    } else
        optopt = *place++;

    /* See if option letter is one the caller wanted... */
    if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
        if (*place == 0)
            ++optind;
        if (opterr && *ostr != ':')
            (void)
                fprintf(stderr, "%s: illegal option -- %c\n", nargv[0], optopt);
        return (BADCH);
    }

    /* Does this option need an argument? */
    if (oli[1] != ':') {
        /* don't need argument */
        optarg = NULL;
        if (*place == 0)
            ++optind;
    } else {
        /* Option-argument is either the rest of this argument or the
           entire next argument. */
        if (*place)
            optarg = place;
        else if (oli[2] == ':')
            /*
             * GNU Extension, for optional arguments if the rest of
             * the argument is empty, we return NULL
             */
            optarg = NULL;
        else if (nargc > ++optind)
            optarg = nargv[optind];
        else {
            /* option-argument absent */
            place = EMSG;
            if (*ostr == ':')
                return (BADARG);
            if (opterr)
                (void)fprintf(stderr,
                              "%s: option requires an argument -- %c\n",
                              nargv[0],
                              optopt);
            return (BADCH);
        }
        place = EMSG;
        ++optind;
    }
    return (optopt); /* return option letter */
}