From c48d2c5e5d05ae55474f54507d378728bbadd8d4 Mon Sep 17 00:00:00 2001
From: Michael Scire <SciresM@gmail.com>
Date: Thu, 30 May 2019 00:33:02 -0700
Subject: [PATCH] Add R_TRY helper macro

---
 nx/include/switch/result.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/nx/include/switch/result.h b/nx/include/switch/result.h
index e55f25c5..904e0533 100644
--- a/nx/include/switch/result.h
+++ b/nx/include/switch/result.h
@@ -17,6 +17,15 @@
 /// Masks out unused bits in a result code, retrieving the actual value for use in comparisons.
 #define R_VALUE(res)       ((res)&0x3FFFFF)
 
+/// Evaluates an expression that returns a result, and returns the result if it would fail.
+#define R_TRY(res_expr) \
+    do { \
+        const Result _tmp_r_try_rc = res_expr; \
+        if (R_FAILED(_tmp_r_try_rc)) { \
+            return _tmp_r_try_rc; \
+        } \
+    } while (0)
+
 /// Builds a result code from its constituent components.
 #define MAKERESULT(module,description) \
     ((((module)&0x1FF)) | ((description)&0x1FFF)<<9)