Import of the watch repository from Pebble

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

@@ -0,0 +1,48 @@
+/*
+ * 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:
+//   void *memcpy(void *s1, const void *s2, size_t n);
+//   void *memmove(void *s1, const void *s2, size_t n);
+///////////////////////////////////////
+
+#include <stddef.h>
+#include <stdint.h>
+
+void *memcpy(void * restrict s1, const void * restrict s2, size_t n) {
+  char *dest = (char*)s1;
+  const char *src = (const char*)s2;
+  while (n--) {
+    *dest++ = *src++;
+  }
+  return s1;
+}
+
+void *memmove(void * restrict s1, const void * restrict s2, size_t n) {
+  char *dest = (char*)s1;
+  const char *src = (const char*)s2;
+  if (dest <= src) {
+    while (n--) {
+      *dest++ = *src++;
+    }
+  } else {
+    while (n--) {
+      dest[n] = src[n];
+    }
+  }
+  return s1;
+}