Changeset 2f7d77c6 in mainline for kernel/generic/src/lib/memfnc.c

Timestamp:

2018-06-14T19:02:26Z (6 years ago)

Author:

Jiří Zárevúcky <jiri.zarevucky@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

587478b

Parents:

abf8bd8

git-author:

Jiří Zárevúcky <jiri.zarevucky@…> (2018-06-14 17:48:39)

git-committer:

Jiří Zárevúcky <jiri.zarevucky@…> (2018-06-14 19:02:26)

Message:

Add rudimentary support for undefined behavior sanitizer.

File:

• kernel/generic/src/lib/memfnc.c (modified) (1 diff)

kernel/generic/src/lib/memfnc.c

@@ -87 +87 @@
 }
 
+/** Compare two memory areas.
+ *
+ * @param s1  Pointer to the first area to compare.
+ * @param s2  Pointer to the second area to compare.
+ * @param len Size of the areas in bytes.
+ *
+ * @return Zero if areas have the same contents. If they differ,
+ *         the sign of the result is the same as the sign of the
+ *         difference of the first pair of different bytes.
+ *
+ */
+int memcmp(const void *s1, const void *s2, size_t len)
+{
+        uint8_t *u1 = (uint8_t *) s1;
+        uint8_t *u2 = (uint8_t *) s2;
+        size_t i;
+
+        for (i = 0; i < len; i++) {
+                if (*u1 != *u2)
+                        return (int)(*u1) - (int)(*u2);
+                ++u1;
+                ++u2;
+        }
+
+        return 0;
+}
+
 /** @}
  */