1 files changed, 71 insertions, 0 deletions
diff --git a/src/misc/getoptdata.cpp b/src/misc/getoptdata.cpp
new file mode 100644
index 000000000..9ec76d9fc
--- /dev/null
+++ b/src/misc/getoptdata.cpp
@@ -0,0 +1,71 @@
+/* $Id$ */
+
+/*
+ * 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;
+		}
+	}
+}
+