Current File : //home2/vacivi36/vittasync.vacivitta.com.br/vittasync/node/deps/cares/src/tools/ares_getopt.c
/*
* Original file name getopt.c Initial import into the c-ares source tree
* on 2007-04-11. Lifted from version 5.2 of the 'Open Mash' project with
* the modified BSD license, BSD license without the advertising clause.
*
*/
/*
* getopt.c --
*
* Standard UNIX getopt function. Code is from BSD.
*
* Copyright (c) 1987-2001 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:
*
* A. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* B. 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.
* C. 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.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ares_getopt.h"
#define BADCH (int)'?'
#define BADARG (int)':'
#define EMSG (char *)""
void ares_getopt_init(ares_getopt_state_t *state, int nargc, const char **nargv)
{
memset(state, 0, sizeof(*state));
state->opterr = 1;
state->optind = 1;
state->place = EMSG;
state->argc = nargc;
state->argv = nargv;
}
/*
* ares_getopt --
* Parse argc/argv argument vector.
*/
int ares_getopt(ares_getopt_state_t *state, const char *ostr)
{
const char *oli; /* option letter list index */
/* update scanning pointer */
if (!*state->place) {
if (state->optind >= state->argc) {
return -1;
}
state->place = state->argv[state->optind];
if (*(state->place) != '-') {
return -1;
}
state->place++;
/* found "--" */
if (*(state->place) == '-') {
state->optind++;
return -1;
}
/* Found just - */
if (!*(state->place)) {
state->optopt = 0;
return BADCH;
}
}
/* option letter okay? */
state->optopt = *(state->place);
state->place++;
oli = strchr(ostr, state->optopt);
if (oli == NULL) {
if (!(*state->place)) {
++state->optind;
}
if (state->opterr) {
(void)fprintf(stderr, "%s: illegal option -- %c\n", __FILE__,
state->optopt);
}
return BADCH;
}
/* don't need argument */
if (*++oli != ':') {
state->optarg = NULL;
if (!*state->place) {
++state->optind;
}
} else {
/* need an argument */
if (*state->place) { /* no white space */
state->optarg = state->place;
} else if (state->argc <= ++state->optind) { /* no arg */
state->place = EMSG;
if (*ostr == ':') {
return BADARG;
}
if (state->opterr) {
(void)fprintf(stderr, "%s: option requires an argument -- %c\n",
__FILE__, state->optopt);
}
return BADARG;
} else { /* white space */
state->optarg = state->argv[state->optind];
}
state->place = EMSG;
++state->optind;
}
return state->optopt; /* dump back option letter */
}
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