mirror of
https://github.com/LadybirdBrowser/ladybird.git
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c70f45ff44
This commit moves the length calculations out to be directly on the StringView users. This is an important step towards the goal of removing StringView(char const*), as it moves the responsibility of calculating the size of the string to the user of the StringView (which will prevent naive uses causing OOB access).
358 lines
11 KiB
C++
358 lines
11 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/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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static size_t s_index_into_multioption_argument = 0;
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[[gnu::format(printf, 1, 2)]] static inline void report_error(char const* format, ...)
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{
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if (!opterr)
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return;
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fputs("\033[31m", stderr);
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va_list ap;
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va_start(ap, format);
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vfprintf(stderr, format, ap);
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va_end(ap);
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fputs("\033[0m\n", stderr);
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}
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namespace {
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class OptionParser {
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public:
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OptionParser(int argc, char* const* argv, StringView short_options, option const* long_options, int* out_long_option_index = nullptr);
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int getopt();
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private:
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bool lookup_short_option(char option, int& needs_value) const;
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int handle_short_option();
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option const* lookup_long_option(char* raw) const;
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int handle_long_option();
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void shift_argv();
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bool find_next_option();
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StringView current_arg() const
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{
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auto const* arg_ptr = m_argv[m_arg_index];
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if (arg_ptr == NULL)
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return {};
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return { arg_ptr, strlen(arg_ptr) };
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}
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size_t m_argc { 0 };
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char* const* m_argv { nullptr };
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StringView m_short_options;
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option const* m_long_options { nullptr };
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int* m_out_long_option_index { nullptr };
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bool m_stop_on_first_non_option { false };
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size_t m_arg_index { 0 };
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size_t m_consumed_args { 0 };
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};
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OptionParser::OptionParser(int argc, char* const* argv, StringView short_options, option const* long_options, int* out_long_option_index)
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: m_argc(argc)
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, m_argv(argv)
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, m_short_options(short_options)
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, m_long_options(long_options)
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, m_out_long_option_index(out_long_option_index)
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{
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// In the following case:
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// $ foo bar -o baz
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// we want to parse the option (-o baz) first, and leave the argument (bar)
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// in argv after we return -1 when invoked the second time. So we reorder
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// argv to put options first and positional arguments next. To turn this
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// behavior off, start the short options spec with a "+". This is a GNU
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// extension that we support.
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m_stop_on_first_non_option = short_options.starts_with('+');
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// See if we should reset the internal state.
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if (optreset || optind == 0) {
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optreset = 0;
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optind = 1;
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s_index_into_multioption_argument = 0;
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}
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optopt = 0;
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optarg = nullptr;
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}
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int OptionParser::getopt()
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{
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bool should_reorder_argv = !m_stop_on_first_non_option;
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int res = -1;
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bool found_an_option = find_next_option();
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auto arg = current_arg();
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if (!found_an_option) {
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res = -1;
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if (arg == "--")
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m_consumed_args = 1;
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else
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m_consumed_args = 0;
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} else {
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// Alright, so we have an option on our hands!
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bool is_long_option = arg.starts_with("--");
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if (is_long_option)
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res = handle_long_option();
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else
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res = handle_short_option();
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// If we encountered an error, return immediately.
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if (res == '?')
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return '?';
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}
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if (should_reorder_argv)
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shift_argv();
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else
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VERIFY(optind == static_cast<int>(m_arg_index));
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optind += m_consumed_args;
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return res;
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}
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bool OptionParser::lookup_short_option(char option, int& needs_value) const
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{
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Vector<StringView> parts = m_short_options.split_view(option, true);
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VERIFY(parts.size() <= 2);
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if (parts.size() < 2) {
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// Haven't found the option in the spec.
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return false;
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}
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if (parts[1].starts_with("::")) {
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// If an option is followed by two colons, it optionally accepts an
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// argument.
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needs_value = optional_argument;
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} else if (parts[1].starts_with(':')) {
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// If it's followed by one colon, it requires an argument.
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needs_value = required_argument;
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} else {
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// Otherwise, it doesn't accept arguments.
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needs_value = no_argument;
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}
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return true;
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}
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int OptionParser::handle_short_option()
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{
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StringView arg = current_arg();
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VERIFY(arg.starts_with('-'));
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if (s_index_into_multioption_argument == 0) {
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// Just starting to parse this argument, skip the "-".
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s_index_into_multioption_argument = 1;
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}
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char option = arg[s_index_into_multioption_argument];
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s_index_into_multioption_argument++;
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int needs_value = no_argument;
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bool ok = lookup_short_option(option, needs_value);
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if (!ok) {
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optopt = option;
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report_error("Unrecognized option \033[1m-%c\033[22m", option);
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return '?';
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}
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// Let's see if we're at the end of this argument already.
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if (s_index_into_multioption_argument < arg.length()) {
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// This not yet the end.
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if (needs_value == no_argument) {
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optarg = nullptr;
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m_consumed_args = 0;
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} else {
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// Treat the rest of the argument as the value, the "-ovalue"
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// syntax.
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optarg = m_argv[m_arg_index] + s_index_into_multioption_argument;
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// Next time, process the next argument.
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s_index_into_multioption_argument = 0;
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m_consumed_args = 1;
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}
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} else {
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s_index_into_multioption_argument = 0;
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if (needs_value != required_argument) {
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optarg = nullptr;
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m_consumed_args = 1;
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} else if (m_arg_index + 1 < m_argc) {
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// Treat the next argument as a value, the "-o value" syntax.
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optarg = m_argv[m_arg_index + 1];
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m_consumed_args = 2;
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} else {
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report_error("Missing value for option \033[1m-%c\033[22m", option);
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return '?';
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}
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}
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return option;
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}
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option const* OptionParser::lookup_long_option(char* raw) const
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{
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StringView arg { raw, strlen(raw) };
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for (size_t index = 0; m_long_options[index].name; index++) {
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auto& option = m_long_options[index];
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StringView name { option.name, strlen(option.name) };
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if (!arg.starts_with(name))
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continue;
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// It would be better to not write out the index at all unless we're
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// sure we've found the right option, but whatever.
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if (m_out_long_option_index)
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*m_out_long_option_index = index;
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// Can either be "--option" or "--option=value".
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if (arg.length() == name.length()) {
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optarg = nullptr;
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return &option;
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}
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VERIFY(arg.length() > name.length());
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if (arg[name.length()] == '=') {
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optarg = raw + name.length() + 1;
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return &option;
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}
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}
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return nullptr;
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}
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int OptionParser::handle_long_option()
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{
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VERIFY(current_arg().starts_with("--"sv));
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// We cannot set optopt to anything sensible for long options, so set it to 0.
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optopt = 0;
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auto* option = lookup_long_option(m_argv[m_arg_index] + 2);
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if (!option) {
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report_error("Unrecognized option \033[1m%s\033[22m", m_argv[m_arg_index]);
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return '?';
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}
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// lookup_long_option() will also set optarg if the value of the option is
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// specified using "--option=value" syntax.
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// Figure out whether this option needs and/or has a value (also called "an
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// argument", but let's not call it that to distinguish it from argv
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// elements).
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switch (option->has_arg) {
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case no_argument:
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if (optarg) {
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report_error("Option \033[1m--%s\033[22m doesn't accept an argument", option->name);
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return '?';
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}
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m_consumed_args = 1;
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break;
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case optional_argument:
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m_consumed_args = 1;
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break;
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case required_argument:
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if (optarg) {
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// Value specified using "--option=value" syntax.
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m_consumed_args = 1;
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} else if (m_arg_index + 1 < m_argc) {
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// Treat the next argument as a value in "--option value" syntax.
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optarg = m_argv[m_arg_index + 1];
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m_consumed_args = 2;
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} else {
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report_error("Missing value for option \033[1m--%s\033[22m", option->name);
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return '?';
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}
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break;
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default:
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VERIFY_NOT_REACHED();
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}
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// Now that we've figured the value out, see about reporting this option to
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// our caller.
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if (option->flag) {
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*option->flag = option->val;
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return 0;
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}
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return option->val;
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}
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void OptionParser::shift_argv()
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{
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// We've just parsed an option (which perhaps has a value).
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// Put the option (along with it value, if any) in front of other arguments.
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VERIFY(optind <= static_cast<int>(m_arg_index));
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if (optind == static_cast<int>(m_arg_index) || m_consumed_args == 0) {
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// Nothing to do!
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return;
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}
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auto new_argv = const_cast<char**>(m_argv);
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char* buffer[m_consumed_args];
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memcpy(buffer, &new_argv[m_arg_index], sizeof(char*) * m_consumed_args);
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memmove(&new_argv[optind + m_consumed_args], &new_argv[optind], sizeof(char*) * (m_arg_index - optind));
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memcpy(&new_argv[optind], buffer, sizeof(char*) * m_consumed_args);
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}
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bool OptionParser::find_next_option()
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{
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for (m_arg_index = optind; m_arg_index < m_argc && m_argv[m_arg_index]; m_arg_index++) {
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StringView arg = current_arg();
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// Anything that doesn't start with a "-" is not an option.
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if (!arg.starts_with('-')) {
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if (m_stop_on_first_non_option)
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return false;
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continue;
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}
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// As a special case, a single "-" is not an option either.
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// (It's typically used by programs to refer to stdin).
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if (arg == "-")
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continue;
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// As another special case, a "--" is not an option either, and we stop
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// looking for further options if we encounter it.
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if (arg == "--")
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return false;
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// Otherwise, we have found an option!
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return true;
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}
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// Reached the end and still found no options.
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return false;
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}
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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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option dummy { nullptr, 0, nullptr, 0 };
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OptionParser parser { argc, argv, { short_options, strlen(short_options) }, &dummy };
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return parser.getopt();
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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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OptionParser parser { argc, argv, { short_options, strlen(short_options) }, long_options, out_long_option_index };
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return parser.getopt();
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}
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