Import of the watch repository from Pebble

platform/tintin/boot/libc/string/memcmp.c

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+///////////////////////////////////////
+// Implements:
+//   int memcmp(const void *s1, const void *s2, size_t n);
+
+#include <stddef.h>
+
+int memcmp(const void *s1, const void *s2, size_t n) {
+  const unsigned char *p1 = (const unsigned char*)s1;
+  const unsigned char *p2 = (const unsigned char*)s2;
+  while (n--) {
+    int diff = *p1 - *p2;
+    if (diff) {
+      return diff;
+    }
+    p1++;
+    p2++;
+  }
+  return 0;
+}