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-rw-r--r--src/misc/getoptdata.cpp71
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;
+ }
+ }
+}
+