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//===-- str{,case}cmp implementation ----------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIBC_SRC_STRING_MEMORY_UTILS_STRCMP_IMPLEMENTATIONS_H
#define LLVM_LIBC_SRC_STRING_MEMORY_UTILS_STRCMP_IMPLEMENTATIONS_H
#include <stddef.h>
namespace __llvm_libc {
template <typename Comp>
constexpr static int strcmp_implementation(const char *left, const char *right,
Comp &&comp) {
// TODO: Look at benefits for comparing words at a time.
for (; *left && !comp(*left, *right); ++left, ++right)
;
return comp(*reinterpret_cast<const unsigned char *>(left),
*reinterpret_cast<const unsigned char *>(right));
}
template <typename Comp>
constexpr static int strncmp_implementation(const char *left, const char *right,
size_t n, Comp &&comp) {
if (n == 0)
return 0;
// TODO: Look at benefits for comparing words at a time.
for (; n > 1; --n, ++left, ++right) {
char lc = *left;
if (!comp(lc, '\0') || comp(lc, *right))
break;
}
return comp(*reinterpret_cast<const unsigned char *>(left),
*reinterpret_cast<const unsigned char *>(right));
}
} // namespace __llvm_libc
#endif // LLVM_LIBC_SRC_STRING_MEMORY_UTILS_STRCMP_IMPLEMENTATIONS_H
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