/* $Id$ */ /* * 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/>. */ /** @file getoptdata.cpp Library for parsing command line options. */ #include "../stdafx.h" #include "getoptdata.h" /** * Find the next option. * @return Function returns one * - An option letter if it found another option. * - -1 if option processing is finished. Inspect #argv and #numleft to find the command line arguments. * - -2 if an error was encountered. */ int GetOptData::GetOpt() { const OptionData *odata; char *s = this->cont; if (s == NULL) { if (this->numleft == 0) return -1; // No arguments left -> finished. s = this->argv[0]; if (*s != '-') return -1; // No leading '-' -> not an option -> finished. this->argv++; this->numleft--; /* Is it a long option? */ for (odata = this->options; odata->flags != ODF_END; odata++) { if (odata->longname != NULL && !strcmp(odata->longname, s)) { // Long options always use the entire argument. this->cont = NULL; goto set_optval; } } s++; // Skip leading '-'. } /* Is it a short option? */ for (odata = this->options; odata->flags != ODF_END; odata++) { if (odata->shortname != '\0' && *s == odata->shortname) { this->cont = (s[1] != '\0') ? s + 1 : NULL; set_optval: // Handle option value of *odata . this->opt = NULL; switch (odata->flags) { case ODF_NO_VALUE: return odata->id; case ODF_HAS_VALUE: case ODF_OPTIONAL_VALUE: if (this->cont != NULL) { // Remainder of the argument is the option value. this->opt = this->cont; this->cont = NULL; return odata->id; } /* No more arguments, either return an error or a value-less option. */ if (this->numleft == 0) return (odata->flags == ODF_HAS_VALUE) ? -2 : odata->id; /* Next argument looks like another option, let's not return it as option value. */ if (odata->flags == ODF_OPTIONAL_VALUE && this->argv[0][0] == '-') return odata->id; this->opt = this->argv[0]; // Next argument is the option value. this->argv++; this->numleft--; return odata->id; default: NOT_REACHED(); } } } return -2; // No other ways to interpret the text -> error. }