libstrat: add R_TRY helper macro.

include/stratosphere/results.hpp

@@ -16,6 +16,9 @@
  
 #pragma once
 
+/* Utilities. */
+#include "results/utilities.h"
+
 /* Official. */
 #include "results/creport_results.hpp"
 #include "results/debug_results.hpp"

include/stratosphere/results/utilities.h

@@ -0,0 +1,25 @@
+/**
+ * @file result_utilities.h
+ * @brief Utilities for handling Results.
+ * @author SciresM
+ * @copyright libnx Authors
+ */
+#pragma once
+#include <switch/result.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/// 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)
+
+#ifdef __cplusplus
+}
+#endif