X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=lib%2Fecoli_assert.h;h=fcd218628fc433b5cee60b6f59eb71487c0b9858;hb=15718f19cbf3868bf6fba79f4e26b5254c57873e;hp=b1ef0ecaf7b139f5c222f5d19e20f42c0b512742;hpb=0a2b19af9303c4a0ec05bea7afe1803a429517bf;p=protos%2Flibecoli.git

diff --git a/lib/ecoli_assert.h b/lib/ecoli_assert.h
index b1ef0ec..fcd2186 100644
--- a/lib/ecoli_assert.h
+++ b/lib/ecoli_assert.h
@@ -5,8 +5,8 @@
 /**
  * Assert API
  *
- * Helpers to check at runtime if a condition is true, and abort
- * (exit) otherwise.
+ * Helpers to check at runtime if a condition is true, or otherwise
+ * either abort (exit program) or return an error.
  */
 
 #ifndef ECOLI_ASSERT_
@@ -32,4 +32,24 @@
 void __ec_assert_print(bool expr, const char *expr_str,
 		const char *format, ...);
 
+/**
+ * Check a condition or return.
+ *
+ * If the condition is true, do nothing. If it is false, set
+ * errno and return the specified value.
+ *
+ * @param cond
+ *   The condition to test.
+ * @param ret
+ *   The value to return.
+ * @param err
+ *   The errno to set.
+ */
+#define EC_CHECK_ARG(cond, ret, err) do {				\
+		if (!(cond)) {						\
+			errno = err;					\
+			return ret;					\
+		}							\
+	} while(0)
+
 #endif