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engines/glk/tads/tads2/command_line.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program 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, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "glk/tads/tads2/command_line.h"
+
+namespace Glk {
+namespace TADS {
+namespace TADS2 {
+
+/* get a toggle argument */
+int cmdtog(errcxdef *ec, int prv, char *argp, int ofs,
+		   void (*usagefn)(errcxdef *))
+{
+	switch(argp[ofs + 1])
+	{
+	case '+':
+		return(TRUE);
+
+	case '-':
+		return(FALSE);
+
+	case '\0':
+		return(!prv);
+
+	default:
+		/* invalid - display usage if we have a callback for it */
+		if (usagefn != nullptr)
+			(*usagefn)(ec);
+		NOTREACHEDV(int);
+		return 0;
+	}
+}
+
+/* get an argument to a switch */
+char *cmdarg(errcxdef *ec, char ***argpp, int *ip, int argc, int ofs,
+			 void (*usagefn)(errcxdef *))
+{
+	char *ret;
+
+	/*
+	 *   check to see if the argument is appended directly to the option;
+	 *   if not, look at the next string
+	 */
+	ret = (**argpp) + ofs + 1;
+	if (*ret == '\0')
+	{
+		/*
+		 *   it's not part of this string - get the argument from the next
+		 *   string in the vector
+		 */
+		++(*ip);
+		++(*argpp);
+		ret = (*ip >= argc ? nullptr : **argpp);
+	}
+
+	/*
+	 *   if we didn't find the argument, it's an error - display usage if
+	 *   we have a valid usage callback
+	 */
+	if ((ret == nullptr || *ret == 0) && usagefn != nullptr)
+		(*usagefn)(ec);
+
+	return ret;
+}
+
+} // End of namespace TADS2
+} // End of namespace TADS
+} // End of namespace Glk