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/*
* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/ScopeGuard.h>
#include <AK/StringView.h>
#include <string.h>
#include <unistd.h>
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsubopt.html
int getsubopt(char** option_array, char* const* tokens, char** option_value)
{
if (**option_array == '\0')
return -1;
auto const* option_ptr = *option_array;
StringView option_string { option_ptr, strlen(option_ptr) };
auto possible_comma_location = option_string.find(',');
char* option_end = const_cast<char*>(option_string.characters_without_null_termination()) + possible_comma_location.value_or(option_string.length());
auto possible_equals_char_location = option_string.find('=');
char* value_start = option_end;
if (possible_equals_char_location.has_value()) {
value_start = const_cast<char*>(option_string.characters_without_null_termination()) + possible_equals_char_location.value();
}
ScopeGuard ensure_end_array_contains_null_char([&]() {
if (*option_end != '\0')
*option_end++ = '\0';
*option_array = option_end;
});
for (int count = 0; tokens[count] != NULL; ++count) {
auto const* token = tokens[count];
StringView token_stringview { token, strlen(token) };
if (!option_string.starts_with(token_stringview))
continue;
if (tokens[count][value_start - *option_array] != '\0')
continue;
*option_value = value_start != option_end ? value_start + 1 : nullptr;
return count;
}
// Note: The current sub-option does not match any option, so prepare to tell this
// to the application.
*option_value = *option_array;
return -1;
}
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