126 lines
2.7 KiB
C
126 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* getopt.c - a simple getopt(3) implementation. See getopt.h for explanation.
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*
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* Copyright (C) 2020 Sean Anderson <seanga2@gmail.com>
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* Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*/
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#define LOG_CATEGORY LOGC_CORE
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#include <common.h>
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#include <getopt.h>
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#include <log.h>
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void getopt_init_state(struct getopt_state *gs)
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{
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gs->index = 1;
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gs->arg_index = 1;
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}
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int __getopt(struct getopt_state *gs, int argc, char *const argv[],
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const char *optstring, bool silent)
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{
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char curopt; /* current option character */
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const char *curoptp; /* pointer to the current option in optstring */
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while (1) {
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log_debug("arg_index: %d index: %d\n", gs->arg_index,
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gs->index);
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/* `--` indicates the end of options */
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if (gs->arg_index == 1 && argv[gs->index] &&
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!strcmp(argv[gs->index], "--")) {
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gs->index++;
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return -1;
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}
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/* Out of arguments */
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if (gs->index >= argc)
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return -1;
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/* Can't parse non-options */
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if (*argv[gs->index] != '-')
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return -1;
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/* We have found an option */
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curopt = argv[gs->index][gs->arg_index];
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if (curopt)
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break;
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/*
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* no more options in current argv[] element; try the next one
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*/
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gs->index++;
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gs->arg_index = 1;
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}
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/* look up current option in optstring */
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curoptp = strchr(optstring, curopt);
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if (!curoptp) {
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if (!silent)
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printf("%s: invalid option -- %c\n", argv[0], curopt);
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gs->opt = curopt;
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gs->arg_index++;
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return '?';
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}
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if (*(curoptp + 1) != ':') {
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/* option with no argument. Just return it */
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gs->arg = NULL;
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gs->arg_index++;
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return curopt;
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}
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if (*(curoptp + 1) && *(curoptp + 2) == ':') {
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/* optional argument */
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if (argv[gs->index][gs->arg_index + 1]) {
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/* optional argument with directly following arg */
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gs->arg = argv[gs->index++] + gs->arg_index + 1;
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gs->arg_index = 1;
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return curopt;
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}
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if (gs->index + 1 == argc) {
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/* We are at the last argv[] element */
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gs->arg = NULL;
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gs->index++;
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return curopt;
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}
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if (*argv[gs->index + 1] != '-') {
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/*
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* optional argument with arg in next argv[] element
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*/
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gs->index++;
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gs->arg = argv[gs->index++];
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gs->arg_index = 1;
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return curopt;
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}
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/* no optional argument found */
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gs->arg = NULL;
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gs->arg_index = 1;
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gs->index++;
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return curopt;
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}
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if (argv[gs->index][gs->arg_index + 1]) {
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/* required argument with directly following arg */
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gs->arg = argv[gs->index++] + gs->arg_index + 1;
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gs->arg_index = 1;
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return curopt;
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}
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gs->index++;
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gs->arg_index = 1;
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if (gs->index >= argc || argv[gs->index][0] == '-') {
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if (!silent)
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printf("option requires an argument -- %c\n", curopt);
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gs->opt = curopt;
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return ':';
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}
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gs->arg = argv[gs->index++];
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return curopt;
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}
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