Import of the watch repository from Pebble

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

@@ -0,0 +1,40 @@
+/*
+ * 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 *strchr(const char *s1, int c);
+//   char *strrchr(const char *s1, int c);
+///////////////////////////////////////
+
+#include <stddef.h>
+#include <string.h>
+
+char *strchr(const char *s, int c) {
+  size_t n = strlen(s) + 1;
+  return memchr(s, c, n);
+}
+
+char *strrchr(const char *s, int c) {
+  char ch = (char)c;
+  size_t i = strlen(s);
+  do {
+    if (s[i] == ch) {
+      return (char*)&s[i];
+    }
+  } while (i--);
+  return NULL;
+}