1 files changed, 70 insertions, 0 deletions
diff --git a/engines/glk/alan2/jumps.h b/engines/glk/alan2/jumps.h
new file mode 100644
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+++ b/engines/glk/alan2/jumps.h
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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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef GLK_ALAN2_JUMPS
+#define GLK_ALAN2_JUMPS
+
+/* This provides a simplified version of the ScummVM coroutines to allow for automated
+ * breakouts to the main game loop from subroutinese rather than using unportable setjmps
+ */
+
+namespace Glk {
+namespace Alan2 {
+
+/**
+ * Context used for flagging when a break to the outer game loop
+ */
+struct Context {
+	bool _break;
+	Context() : _break(false) {}
+};
+
+#define CALL0(METHOD) { METHOD(context); if (context._break) return; }
+#define CALL1(METHOD, P1) { METHOD(context, P1); if (context._break) return; }
+#define CALL2(METHOD, P1, P2) { METHOD(context, P2); if (context._break) return; }
+#define CALL3(METHOD, P1, P2, P3) { METHOD(context, P3); if (context._break) return; }
+#define CALL4(METHOD, P1, P2, P3, P4) { METHOD(context, P4); if (context._break) return; }
+#define FUNC0(METHOD, RET) { RET = METHOD(context); if (context._break) return; }
+#define FUNC1(METHOD, RET, P1) { RET = METHOD(context, P1); if (context._break) return; }
+#define FUNC2(METHOD, RET, P1, P2) { RET = METHOD(context, P2); if (context._break) return; }
+#define FUNC3(METHOD, RET, P1, P2, P3) { RET = METHOD(context, P3); if (context._break) return; }
+#define FUNC4(METHOD, RET, P1, P2, P3, P4) { RET = METHOD(context, P4); if (context._break) return; }
+
+#define R0CALL0(METHOD) { METHOD(context); if (context._break) return 0; }
+#define R0CALL1(METHOD, P1) { METHOD(context, P1); if (context._break) return 0; }
+#define R0CALL2(METHOD, P1, P2) { METHOD(context, P2); if (context._break) return 0; }
+#define R0CALL3(METHOD, P1, P2, P3) { METHOD(context, P3); if (context._break) return 0; }
+#define R0CALL4(METHOD, P1, P2, P3, P4) { METHOD(context, P4); if (context._break) return 0; }
+#define R0FUNC0(METHOD, RET) { RET = METHOD(context); if (context._break) return 0; }
+#define R0FUNC1(METHOD, RET, P1) { RET = METHOD(context, P1); if (context._break) return 0; }
+#define R0FUNC2(METHOD, RET, P1, P2) { RET = METHOD(context, P2); if (context._break) return 0; }
+#define R0FUNC3(METHOD, RET, P1, P2, P3) { RET = METHOD(context, P3); if (context._break) return 0; }
+#define R0FUNC4(METHOD, RET, P1, P2, P3, P4) { RET = METHOD(context, P4); if (context._break) return 0; }
+
+#define CONTEXT Context &context
+#define LONG_JUMP { context._break = true; return; }
+#define LONG_JUMP0 { context._break = true; return 0; }
+
+} // End of namespace Alan2
+} // End of namespace Glk
+
+#endif