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| 1 | //===-- str{,case}cmp implementation ----------------------------*- C++ -*-===// |
|---|---|
| 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 | #ifndef LLVM_LIBC_SRC_STRING_MEMORY_UTILS_INLINE_STRCMP_H |
| 10 | #define LLVM_LIBC_SRC_STRING_MEMORY_UTILS_INLINE_STRCMP_H |
| 11 | |
| 12 | #include "src/__support/macros/attributes.h" // LIBC_INLINE |
| 13 | #include "src/__support/macros/config.h" // LIBC_NAMESPACE_DECL |
| 14 | #include <stddef.h> |
| 15 | |
| 16 | namespace LIBC_NAMESPACE_DECL { |
| 17 | |
| 18 | template <typename Comp> |
| 19 | LIBC_INLINE constexpr int inline_strcmp(const char *left, const char *right, |
| 20 | Comp &&comp) { |
| 21 | // TODO: Look at benefits for comparing words at a time. |
| 22 | for (; *left && !comp(*left, *right); ++left, ++right) |
| 23 | ; |
| 24 | return comp(*reinterpret_cast<const unsigned char *>(left), |
| 25 | *reinterpret_cast<const unsigned char *>(right)); |
| 26 | } |
| 27 | |
| 28 | template <typename Comp> |
| 29 | LIBC_INLINE constexpr int inline_strncmp(const char *left, const char *right, |
| 30 | size_t n, Comp &&comp) { |
| 31 | if (n == 0) |
| 32 | return 0; |
| 33 | |
| 34 | // TODO: Look at benefits for comparing words at a time. |
| 35 | for (; n > 1; --n, ++left, ++right) { |
| 36 | char lc = *left; |
| 37 | if (!comp(lc, '\0') || comp(lc, *right)) |
| 38 | break; |
| 39 | } |
| 40 | return comp(*reinterpret_cast<const unsigned char *>(left), |
| 41 | *reinterpret_cast<const unsigned char *>(right)); |
| 42 | } |
| 43 | |
| 44 | } // namespace LIBC_NAMESPACE_DECL |
| 45 | |
| 46 | #endif // LLVM_LIBC_SRC_STRING_MEMORY_UTILS_INLINE_STRCMP_H |
| 47 |
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