Added a CLEANUP mechanism to the exception handling library. Fixed a bug in the way setjmp() return codes were being handled that lead to infinite loops in some cases, exceptions getting missed in others. Made FINALLY {} a required element (unfortunately).

demo/cleanup.c

@@ -0,0 +1,36 @@
+#include "exclib.h"
+
+int main(void)
+{
+  int val = 512;
+  int *ptr = &val;
+
+  TRY {
+    THROW(3, "Checking to ensure cleanup behavior executes before EXCEPT block");
+  } CLEANUP {
+    ptr = NULL;
+  } EXCEPT {
+  } CATCH(3) {
+    if ( ptr != NULL ) {
+      EXCLIB_TRACE("pointer was not reset to NULL in first CLEANUP block");
+      return 1;
+    }
+  } FINALLY {
+  } ETRY;
+
+  ptr = &val;
+  TRY {
+    /* No exception thrown here, CLEANUP should still execute */
+  } CLEANUP {
+    ptr = NULL;
+  } EXCEPT {
+  } FINALLY {
+  } ETRY;
+
+  if ( ptr != NULL ) {
+    EXCLIB_TRACE("pointer was not reset to NULL in first TRY block");
+    return 1;
+  }
+
+  return 0;
+}