port some old code

1 files changed, 25 insertions, 0 deletions

diff --git a/lib/cbit/misc.h b/lib/cbit/misc.h
new file mode 100644
index 0000000..45876f9
--- /dev/null
+++ b/lib/cbit/misc.h
@@ -0,0 +1,25 @@
+#pragma once
+
+#define LET_LOOP__(expr, ctr) \
+   if (0) \
+      __done_##ctr: continue; \
+   else if (0) \
+      __break_##ctr: break; \
+   else \
+      for (; ; ({ goto __break_##ctr; })) \
+         for (expr; ; ({ goto __done_##ctr; }))
+
+#define LET_LOOP_(expr, ctr) LET_LOOP__(expr, ctr)
+#define LET_LOOP(expr) LET_LOOP_(expr, __COUNTER__)
+
+#define LET__(expr, ctr) \
+   if (0) \
+      __done_##ctr: ; \
+   else \
+      for (expr; ; ({ goto __done_##ctr; }))
+
+#define LET_(expr, ctr) LET__(expr, ctr)
+#define LET(expr) LET_(expr, __COUNTER__)
+
+#define safe_mul(a, b) ((a) * (b)) /* XXX */
+