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515f31339c
The Linux `getopt_long` manpage tells users to reset `optind` to 1 when scanning the same argument vector or a new argument vector again. This makes sense, since `optind` denotes the _next_ option to be processed. The behavior of setting `optind` to 0 doesn't seem to be specified anywhere, so let's also remove that comment from `unistd.h`.
95 lines
3.0 KiB
C++
95 lines
3.0 KiB
C++
/*
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* Copyright (c) 2020, Sergey Bugaev <bugaevc@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/OptionParser.h>
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#include <AK/StringView.h>
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#include <AK/Vector.h>
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#include <getopt.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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int opterr = 1;
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int optopt = 0;
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int optind = 1;
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int optreset = 0;
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char* optarg = nullptr;
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// POSIX says, "When an element of argv[] contains multiple option characters,
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// it is unspecified how getopt() determines which options have already been
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// processed". Well, this is how we do it.
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namespace {
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Vector<StringView> s_args;
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OptionParser s_parser;
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}
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int getopt(int argc, char* const* argv, char const* short_options)
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{
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s_args.clear_with_capacity();
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s_args.ensure_capacity(argc);
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for (auto i = 1; i < argc; ++i)
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s_args.append({ argv[i], strlen(argv[i]) });
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if (optind == 1 || optreset == 1) {
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s_parser.reset_state();
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optind = 1;
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optreset = 0;
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}
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auto result = s_parser.getopt(s_args.span(), { short_options, strlen(short_options) }, {}, {});
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optind += result.consumed_args;
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optarg = result.optarg_value.map([](auto x) { return const_cast<char*>(x.characters_without_null_termination()); }).value_or(optarg);
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optopt = result.optopt_value.value_or(optopt);
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return result.result;
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}
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int getopt_long(int argc, char* const* argv, char const* short_options, const struct option* long_options, int* out_long_option_index)
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{
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s_args.clear_with_capacity();
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s_args.ensure_capacity(argc);
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for (auto i = 1; i < argc; ++i)
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s_args.append({ argv[i], strlen(argv[i]) });
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size_t long_option_count = 0;
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for (auto option = long_options; option && option->name; option += 1)
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long_option_count++;
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Vector<OptionParser::Option> translated_long_options;
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translated_long_options.ensure_capacity(long_option_count);
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for (size_t i = 0; i < long_option_count; ++i) {
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auto option = &long_options[i];
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translated_long_options.append(OptionParser::Option {
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.name = { option->name, strlen(option->name) },
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.requirement = option->has_arg == no_argument
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? AK::OptionParser::ArgumentRequirement::NoArgument
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: option->has_arg == optional_argument
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? AK::OptionParser::ArgumentRequirement::HasOptionalArgument
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: AK::OptionParser::ArgumentRequirement::HasRequiredArgument,
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.flag = option->flag,
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.val = option->val,
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});
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}
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if (optind == 1 || optreset == 1) {
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s_parser.reset_state();
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optind = 1;
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optreset = 0;
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}
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auto result = s_parser.getopt(
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s_args.span(),
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{ short_options, strlen(short_options) },
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translated_long_options.span(),
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out_long_option_index ? *out_long_option_index : Optional<int&>());
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optind += result.consumed_args;
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optarg = result.optarg_value.map([](auto x) { return const_cast<char*>(x.characters_without_null_termination()); }).value_or(optarg);
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optopt = result.optopt_value.value_or(optopt);
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return result.result;
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}
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