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/* $Id$ */
/*
* 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.
* - -2 if an error was encountered.
*/
int GetOptData::GetOpt()
{
char *s = this->cont;
if (s != NULL) {
goto md_continue_here;
}
for (;;) {
if (--this->numleft < 0) return -1;
s = *this->argv++;
if (*s == '-') {
md_continue_here:;
s++;
if (*s != 0) {
const char *r;
/* Found argument, try to locate it in options. */
if (*s == ':' || (r = strchr(this->options, *s)) == NULL) {
/* ERROR! */
return -2;
}
if (r[1] == ':') {
char *t;
/* Item wants an argument. Check if the argument follows, or if it comes as a separate arg. */
if (!*(t = s + 1)) {
/* It comes as a separate arg. Check if out of args? */
if (--this->numleft < 0 || *(t = *this->argv) == '-') {
/* Check if item is optional? */
if (r[2] != ':') return -2;
this->numleft++;
t = NULL;
} else {
this->argv++;
}
}
this->opt = t;
this->cont = NULL;
return *s;
}
this->opt = NULL;
this->cont = s;
return *s;
}
} else {
/* This is currently not supported. */
return -2;
}
}
}
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