Import of the watch repository from Pebble

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

@@ -0,0 +1,45 @@
+/*
+ * 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:
+//   char *strcat(char *s1, const char *s2);
+//   char *strncat(char *s1, const char *s2, size_t n);
+///////////////////////////////////////
+// Notes:
+//   Tuned for code size.
+
+#include <string.h>
+
+char *strcat(char * restrict s1, const char * restrict s2) {
+  char *rc = s1;
+  s1 += strlen(s1);
+  strcpy(s1, s2);
+  return rc;
+}
+
+char *strncat(char * restrict s1, const char * restrict s2, size_t n) {
+  char * rc = s1;
+  s1 += strlen(s1);
+
+  size_t strn = strlen(s2);
+  if (strn > n) {
+    strn = n;
+  }
+  memcpy(s1, s2, strn);
+  s1[strn] = '\0';
+  return rc;
+}