getoptdata.cpp

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/*
 * This file is part of OpenTTD.
 * 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.
 * 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.
 * 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/>.
 */
 
#include "../stdafx.h"
#include "getoptdata.h"
 
#include "../safeguards.h"
 
int GetOptData::GetOpt()
{
  const char *s = this->cont;
  if (s == nullptr) {
    if (this->arguments.empty()) return -1; // No arguments left -> finished.
 
    s = this->arguments[0];
    if (*s != '-') return -1; // No leading '-' -> not an option -> finished.
 
    this->arguments = this->arguments.subspan(1);
 
    /* Is it a long option? */
    for (auto &option : this->options) {
      if (option.longname != nullptr && !strcmp(option.longname, s)) { // Long options always use the entire argument.
        this->cont = nullptr;
        return this->GetOpt(option);
      }
    }
 
    s++; // Skip leading '-'.
  }
 
  /* Is it a short option? */
  for (auto &option : this->options) {
    if (option.shortname != '\0' && *s == option.shortname) {
      this->cont = (s[1] != '\0') ? s + 1 : nullptr;
      return this->GetOpt(option);
    }
  }
 
  return -2; // No other ways to interpret the text -> error.
}
 
int GetOptData::GetOpt(const OptionData &option)
{
  this->opt = nullptr;
  switch (option.type) {
    case ODF_NO_VALUE:
      return option.id;
 
    case ODF_HAS_VALUE:
    case ODF_OPTIONAL_VALUE:
      if (this->cont != nullptr) { // Remainder of the argument is the option value.
        this->opt = this->cont;
        this->cont = nullptr;
        return option.id;
      }
      /* No more arguments, either return an error or a value-less option. */
      if (this->arguments.empty()) return (option.type == ODF_HAS_VALUE) ? -2 : option.id;
 
      /* Next argument looks like another option, let's not return it as option value. */
      if (option.type == ODF_OPTIONAL_VALUE && this->arguments[0][0] == '-') return option.id;
 
      this->opt = this->arguments[0]; // Next argument is the option value.
      this->arguments = this->arguments.subspan(1);
      return option.id;
 
    default: NOT_REACHED();
  }
}