ddb07f57ec
This library is going to be used by the shell module. Some shell users are not satisfied with subcommands alone and need to use the options for commands as well. Signed-off-by: Jakub Rzeszutko <jakub.rzeszutko@nordicsemi.no>
139 lines
4.0 KiB
C
139 lines
4.0 KiB
C
/* $NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $ */
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/* SPDX-License-Identifier: BSD-3-Clause */
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/*
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* Copyright (c) 1987, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <string.h>
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#include "getopt.h"
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#include <logging/log.h>
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LOG_MODULE_REGISTER(getopt);
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#define BADCH ((int)'?')
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#define BADARG ((int)':')
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#define EMSG ""
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void getopt_init(struct getopt_state *state)
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{
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state->opterr = 1;
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state->optind = 1;
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state->optopt = 0;
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state->optreset = 0;
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state->optarg = NULL;
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state->place = ""; /* EMSG */
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}
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/*
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* getopt --
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* Parse argc/argv argument vector.
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*/
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int
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getopt(state, nargc, nargv, ostr)
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struct getopt_state *state;
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int nargc;
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char *const nargv[];
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const char *ostr;
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{
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char *oli; /* option letter list index */
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if (state->optreset || *state->place == 0) { /* update scanning pointer */
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state->optreset = 0;
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state->place = nargv[state->optind];
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if (state->optind >= nargc || *state->place++ != '-') {
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/* Argument is absent or is not an option */
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state->place = EMSG;
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return -1;
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}
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state->optopt = *state->place++;
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if (state->optopt == '-' && *state->place == 0) {
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/* "--" => end of options */
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++state->optind;
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state->place = EMSG;
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return -1;
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}
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if (state->optopt == 0) {
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/* Solitary '-', treat as a '-' option
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* if the program (eg su) is looking for it.
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*/
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state->place = EMSG;
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if (strchr(ostr, '-') == NULL) {
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return -1;
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}
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state->optopt = '-';
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}
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} else {
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state->optopt = *state->place++;
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}
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/* See if option letter is one the caller wanted... */
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oli = strchr(ostr, state->optopt);
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if (state->optopt == ':' || oli == NULL) {
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if (*state->place == 0) {
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++state->optind;
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}
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if (state->opterr && *ostr != ':') {
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LOG_ERR("illegal option -- %c", state->optopt);
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}
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return BADCH;
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}
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/* Does this option need an argument? */
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if (oli[1] != ':') {
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/* don't need argument */
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state->optarg = NULL;
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if (*state->place == 0) {
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++state->optind;
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}
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} else {
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/* Option-argument is either the rest of this argument or the
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* entire next argument.
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*/
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if (*state->place) {
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state->optarg = state->place;
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} else if (nargc > ++state->optind) {
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state->optarg = nargv[state->optind];
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} else {
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/* option-argument absent */
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state->place = EMSG;
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if (*ostr == ':') {
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return BADARG;
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}
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if (state->opterr) {
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LOG_ERR("option requires an argument -- %c",
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state->optopt);
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}
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return BADCH;
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}
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state->place = EMSG;
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++state->optind;
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}
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return state->optopt; /* return option letter */
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}
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