blob: 200384e9f61902789bab40d86fc73ad1beee1a33 [file] [log] [blame]
//===-- Implementation of memccpy ----------------------------------------===//
//
// 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/memccpy.h"
#include "src/__support/common.h"
#include <stddef.h> // For size_t.
namespace LIBC_NAMESPACE {
LLVM_LIBC_FUNCTION(void *, memccpy,
(void *__restrict dest, const void *__restrict src, int c,
size_t count)) {
unsigned char end = static_cast<unsigned char>(c);
const unsigned char *uc_src = static_cast<const unsigned char *>(src);
unsigned char *uc_dest = static_cast<unsigned char *>(dest);
size_t i = 0;
// Copy up until end is found.
for (; i < count && uc_src[i] != end; ++i)
uc_dest[i] = uc_src[i];
// if i < count, then end must have been found, so copy end into dest and
// return the byte after.
if (i < count) {
uc_dest[i] = uc_src[i];
return uc_dest + i + 1;
}
return nullptr;
}
} // namespace LIBC_NAMESPACE