1 //===-- Implementation of strchr ------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "src/string/strchr.h"
10 
11 #include "src/__support/common.h"
12 
13 namespace __llvm_libc {
14 
15 // TODO: Look at performance benefits of comparing words.
16 char *LLVM_LIBC_ENTRYPOINT(strchr)(const char *src, int c) {
17   unsigned char *str =
18       const_cast<unsigned char *>(reinterpret_cast<const unsigned char *>(src));
19   const unsigned char ch = c;
20   for (; *str && *str != ch; ++str)
21     ;
22   return *str == ch ? reinterpret_cast<char *>(str) : nullptr;
23 }
24 
25 } // namespace __llvm_libc
26