mirror of https://github.com/OpenTTD/OpenTTD.git
83 lines
2.7 KiB
C++
83 lines
2.7 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file getoptdata.cpp Library for parsing command line options. */
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#include "../stdafx.h"
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#include "getoptdata.h"
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#include "../safeguards.h"
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/**
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* Find the next option.
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* @return Function returns one
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* - An option letter if it found another option.
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* - -1 if option processing is finished. Inspect #argv and #numleft to find the command line arguments.
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* - -2 if an error was encountered.
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*/
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int GetOptData::GetOpt()
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{
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const char *s = this->cont;
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if (s == nullptr) {
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if (this->arguments.empty()) return -1; // No arguments left -> finished.
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s = this->arguments[0];
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if (*s != '-') return -1; // No leading '-' -> not an option -> finished.
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this->arguments = this->arguments.subspan(1);
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/* Is it a long option? */
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for (auto &option : this->options) {
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if (option.longname != nullptr && !strcmp(option.longname, s)) { // Long options always use the entire argument.
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this->cont = nullptr;
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return this->GetOpt(option);
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}
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}
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s++; // Skip leading '-'.
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}
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/* Is it a short option? */
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for (auto &option : this->options) {
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if (option.shortname != '\0' && *s == option.shortname) {
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this->cont = (s[1] != '\0') ? s + 1 : nullptr;
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return this->GetOpt(option);
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}
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}
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return -2; // No other ways to interpret the text -> error.
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}
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int GetOptData::GetOpt(const OptionData &option)
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{
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this->opt = nullptr;
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switch (option.type) {
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case ODF_NO_VALUE:
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return option.id;
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case ODF_HAS_VALUE:
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case ODF_OPTIONAL_VALUE:
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if (this->cont != nullptr) { // Remainder of the argument is the option value.
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this->opt = this->cont;
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this->cont = nullptr;
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return option.id;
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}
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/* No more arguments, either return an error or a value-less option. */
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if (this->arguments.empty()) return (option.type == ODF_HAS_VALUE) ? -2 : option.id;
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/* Next argument looks like another option, let's not return it as option value. */
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if (option.type == ODF_OPTIONAL_VALUE && this->arguments[0][0] == '-') return option.id;
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this->opt = this->arguments[0]; // Next argument is the option value.
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this->arguments = this->arguments.subspan(1);
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return option.id;
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default: NOT_REACHED();
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}
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}
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