1 files changed, 131 insertions, 0 deletions
diff --git a/exceptions.h b/exceptions.h
new file mode 100644
index 0000000000..07de983f4d
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+++ b/exceptions.h
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+#ifndef __EXCEPTIONS_H__
+#define __EXCEPTIONS_H__
+
+#ifndef XCEPT_H
+#include "except.h"
+#endif
+
+/* Ethereal has only one exception group, to make these macros simple */
+#define XCEPT_GROUP_ETHEREAL 1
+
+/* Ethereal's exceptions */
+#define BoundsError		1	/* Index is out of range */
+
+/* Usage:
+ *
+ * TRY {
+ * 	code;
+ * }
+ *
+ * CATCH(exception) {
+ * 	code;
+ * }
+ *
+ * CATCH_ALL {
+ * 	code;
+ * }
+ *
+ * FINALLY {
+ * 	code;
+ * }
+ *
+ * ENDTRY;
+ *
+ * ********* Never use 'goto' or 'return' inside the TRY, CATCH, CATCH_ALL,
+ * ********* or FINALLY blocks. Execution must proceed through ENDTRY before
+ * ********* branching out.
+ *
+ * This is really something like:
+ *
+ * {
+ * 	x = setjmp()
+ * 	if (x == 0) {
+ * 		<TRY code>
+ * 	}
+ * 	else if (x == 1) {
+ * 		<CATCH(1) code>
+ * 	}
+ * 	else if (x == 2) {
+ * 		<CATCH(2) code>
+ * 	}
+ * 	else {
+ * 		<CATCH_ALL code> {
+ * 	}
+ * 	<FINALLY code>
+ * }<ENDTRY tag>
+ *
+ * All CATCH's must precede a CATCH_ALL.
+ * FINALLY must occur after any CATCH or CATCH_ALL.
+ * ENDTRY marks the end of the TRY code.
+ * TRY and ENDTRY are the mandatory parts of a TRY block.
+ * CATCH, CATCH_ALL, and FINALLY are all optional (although
+ * you'll probably use at least one, otherwise why "TRY"?)
+ *
+ * GET_MESSAGE	returns string ptr to exception message
+ * 		when exception is thrown via THROW_MESSAGE()
+ *
+ * To throw/raise an exception.
+ *
+ * THROW(exception)
+ * RETHROW				rethrow the caught exception
+ *
+ * A cleanup callback is a function called in case an exception occurs
+ * and is not caught. It should be used to free any dynamically-allocated data.
+ * A pop or call_and_pop should occur at the same statement-nesting level
+ * as the push.
+ *
+ * CLEANUP_CB_PUSH(func, data)
+ * CLEANUP_CB_POP
+ * CLEANUP_CB_CALL_AND_POP
+ */
+
+
+
+#define TRY \
+{\
+	except_t *exc; \
+	int caught = 0; \
+	static const except_id_t catch_spec[] = { \
+		{ XCEPT_GROUP_ETHEREAL, XCEPT_CODE_ANY } }; \
+	except_try_push(catch_spec, 1, &exc); \
+	if (exc == 0) { \
+		/* user's code goes here */
+
+#define ENDTRY \
+	} \
+	except_try_pop();\
+}
+
+#define CATCH(x) \
+	} \
+	else if (exc->except_id.except_code == (x)) { \
+		caught = 1;
+		/* user's code goes here */
+
+
+#define CATCH_ALL \
+	} \
+	else { \
+		caught = 1;
+		/* user's code goes here */
+
+#define FINALLY \
+	} \
+	{ \
+		/* user's code goes here */
+
+#define THROW(x) \
+	except_throw(XCEPT_GROUP_ETHEREAL, (x), "XCEPT_GROUP_ETHEREAL")
+
+#define THROW_MESSAGE(x, y) \
+	except_throw(XCEPT_GROUP_ETHEREAL, (x), (y))
+
+#define GET_MESSAGE			except_message(exc)
+
+#define RETHROW				except_rethrow(exc)
+
+#define CLEANUP_CB_PUSH(x,y)		except_cleanup_push((x),(y)
+#define CLEANUP_CB_POP			except_cleanup_push(0)
+#define CLEANUP_CB_CALL_AND_POP		except_cleanup_push(1)
+
+#endif /* __EXCEPTIONS_H__ */