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/* 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.
*/
#include <string.h>
#include "getopt.h"
#include <logging/log.h>
LOG_MODULE_REGISTER(getopt);
#define BADCH ((int)'?')
#define BADARG ((int)':')
#define EMSG ""
void getopt_init(struct getopt_state *state)
{
state->opterr = 1;
state->optind = 1;
state->optopt = 0;
state->optreset = 0;
state->optarg = NULL;
state->place = ""; /* EMSG */
}
/*
* getopt --
* Parse argc/argv argument vector.
*/
int
getopt(state, nargc, nargv, ostr)
struct getopt_state *state;
int nargc;
char *const nargv[];
const char *ostr;
{
char *oli; /* option letter list index */
if (state->optreset || *state->place == 0) { /* update scanning pointer */
state->optreset = 0;
state->place = nargv[state->optind];
if (state->optind >= nargc || *state->place++ != '-') {
/* Argument is absent or is not an option */
state->place = EMSG;
return -1;
}
state->optopt = *state->place++;
if (state->optopt == '-' && *state->place == 0) {
/* "--" => end of options */
++state->optind;
state->place = EMSG;
return -1;
}
if (state->optopt == 0) {
/* Solitary '-', treat as a '-' option
* if the program (eg su) is looking for it.
*/
state->place = EMSG;
if (strchr(ostr, '-') == NULL) {
return -1;
}
state->optopt = '-';
}
} else {
state->optopt = *state->place++;
}
/* See if option letter is one the caller wanted... */
oli = strchr(ostr, state->optopt);
if (state->optopt == ':' || oli == NULL) {
if (*state->place == 0) {
++state->optind;
}
if (state->opterr && *ostr != ':') {
LOG_ERR("illegal option -- %c", state->optopt);
}
return BADCH;
}
/* Does this option need an argument? */
if (oli[1] != ':') {
/* don't need argument */
state->optarg = NULL;
if (*state->place == 0) {
++state->optind;
}
} else {
/* Option-argument is either the rest of this argument or the
* entire next argument.
*/
if (*state->place) {
state->optarg = state->place;
} else if (nargc > ++state->optind) {
state->optarg = nargv[state->optind];
} else {
/* option-argument absent */
state->place = EMSG;
if (*ostr == ':') {
return BADARG;
}
if (state->opterr) {
LOG_ERR("option requires an argument -- %c",
state->optopt);
}
return BADCH;
}
state->place = EMSG;
++state->optind;
}
return state->optopt; /* return option letter */
}
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