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//===-- Implementation of memrchr -----------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/string/memrchr.h"
#include "src/__support/common.h"
#include "src/__support/macros/config.h"
#include "src/__support/macros/null_check.h"
#include <stddef.h>
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(void *, memrchr, (const void *src, int c, size_t n)) {
if (n)
LIBC_CRASH_ON_NULLPTR(src);
const unsigned char *str = reinterpret_cast<const unsigned char *>(src);
const unsigned char ch = static_cast<unsigned char>(c);
for (; n != 0; --n) {
const unsigned char *s = str + n - 1;
if (*s == ch)
return const_cast<unsigned char *>(s);
}
return nullptr;
}
} // namespace LIBC_NAMESPACE_DECL
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