From 54fa31f03b0a4eb9d7ac38943282de7f4da19c4f Mon Sep 17 00:00:00 2001
From: "W. Felix Handte" <w@felixhandte.com>
Date: Wed, 5 Dec 2018 16:23:18 -0800
Subject: [PATCH] Add RETURN_ERROR_IF Macro That Logs Debug Information When
 Check Fails

---
 lib/common/zstd_internal.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/common/zstd_internal.h b/lib/common/zstd_internal.h
index edeb74b9..73fc7705 100644
--- a/lib/common/zstd_internal.h
+++ b/lib/common/zstd_internal.h
@@ -56,6 +56,14 @@ extern "C" {
 #define CHECK_F(f) { size_t const errcod = f; if (ERR_isError(errcod)) return errcod; }  /* check and Forward error code */
 #define CHECK_E(f, e) { size_t const errcod = f; if (ERR_isError(errcod)) return ERROR(e); }  /* check and send Error code */
 
+#define RETURN_ERROR_IF(cond, err, ...) \
+  if (cond) { \
+    RAWLOG(3, "%s:%d: check %s failed, returning %s", __FILE__, __LINE__, ZSTD_QUOTE(cond), ZSTD_QUOTE(ERROR(err))); \
+    RAWLOG(3, ": " __VA_ARGS__); \
+    RAWLOG(3, "\n"); \
+    return ERROR(err); \
+  }
+
 
 /*-*************************************
 *  Common constants