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| 1 | +//===----------------------------------------------------------------------===// |
| 2 | +// |
| 3 | +// Part of libcu++, the C++ Standard Library for your entire system, |
| 4 | +// under the Apache License v2.0 with LLVM Exceptions. |
| 5 | +// See https://llvm.org/LICENSE.txt for license information. |
| 6 | +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 7 | +// SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. |
| 8 | +// |
| 9 | +//===----------------------------------------------------------------------===// |
| 10 | + |
| 11 | +#ifndef _CUDA_STD_CSTRING |
| 12 | +#define _CUDA_STD_CSTRING |
| 13 | + |
| 14 | +#include <cuda/std/detail/__config> |
| 15 | + |
| 16 | +#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC) |
| 17 | +# pragma GCC system_header |
| 18 | +#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG) |
| 19 | +# pragma clang system_header |
| 20 | +#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC) |
| 21 | +# pragma system_header |
| 22 | +#endif // no system header |
| 23 | + |
| 24 | +#include <cuda/std/__cstddef/types.h> |
| 25 | + |
| 26 | +#if !_CCCL_COMPILER(NVRTC) |
| 27 | +# include <cstring> |
| 28 | +#endif // !_CCCL_COMPILER(NVRTC) |
| 29 | + |
| 30 | +_LIBCUDACXX_BEGIN_NAMESPACE_STD |
| 31 | + |
| 32 | +using ::memcpy; |
| 33 | +using ::memset; |
| 34 | +using ::size_t; |
| 35 | + |
| 36 | +_LIBCUDACXX_HIDE_FROM_ABI const void* memchr(const void* __ptr, int __c, size_t __n) noexcept |
| 37 | +{ |
| 38 | + NV_IF_ELSE_TARGET( |
| 39 | + NV_IS_HOST, |
| 40 | + (return ::std::memchr(__ptr, __c, __n);), |
| 41 | + (auto __p = static_cast<const unsigned char*>(__ptr); const auto __p_end = __p + __n; |
| 42 | + |
| 43 | + while (__p != __p_end) { |
| 44 | + if (*__p == static_cast<unsigned char>(__c)) |
| 45 | + { |
| 46 | + return __p; |
| 47 | + } |
| 48 | + ++__p; |
| 49 | + } |
| 50 | + |
| 51 | + return nullptr;)) |
| 52 | +} |
| 53 | + |
| 54 | +_LIBCUDACXX_HIDE_FROM_ABI void* memchr(void* __ptr, int __c, size_t __n) noexcept |
| 55 | +{ |
| 56 | + NV_IF_ELSE_TARGET(NV_IS_HOST, |
| 57 | + (return ::std::memchr(__ptr, __c, __n);), |
| 58 | + (return const_cast<void*>(_CUDA_VSTD::memchr(const_cast<const void*>(__ptr), __c, __n));)) |
| 59 | +} |
| 60 | + |
| 61 | +_LIBCUDACXX_HIDE_FROM_ABI void* memmove(void* __dst, const void* __src, size_t __n) noexcept |
| 62 | +{ |
| 63 | + NV_IF_ELSE_TARGET( |
| 64 | + NV_IS_HOST, |
| 65 | + (return ::std::memmove(__dst, __src, __n);), |
| 66 | + (auto __d = (__dst <= __src) ? static_cast<unsigned char*>(__dst) : (static_cast<unsigned char*>(__dst) + __n - 1); |
| 67 | + auto __s = (__dst <= __src) ? static_cast<const unsigned char*>(__src) |
| 68 | + : (static_cast<const unsigned char*>(__src) + __n - 1); |
| 69 | + const auto __inc = (__dst <= __src) ? 1 : -1; |
| 70 | + const auto __d_end = (__dst <= __src) ? (__d + __n) : (static_cast<unsigned char*>(__dst) - 1); |
| 71 | + |
| 72 | + while (__d != __d_end) { |
| 73 | + *__d = *__s; |
| 74 | + __d += __inc; |
| 75 | + __s += __inc; |
| 76 | + } |
| 77 | + |
| 78 | + return __dst;)) |
| 79 | +} |
| 80 | + |
| 81 | +_LIBCUDACXX_HIDE_FROM_ABI int memcmp(const void* __lhs, const void* __rhs, size_t __n) noexcept |
| 82 | +{ |
| 83 | + NV_IF_ELSE_TARGET( |
| 84 | + NV_IS_HOST, |
| 85 | + (return ::std::memcmp(__lhs, __rhs, __n);), |
| 86 | + (auto __l = static_cast<const unsigned char*>(__lhs); auto __r = static_cast<const unsigned char*>(__rhs); |
| 87 | + const auto __l_end = __l + __n; |
| 88 | + |
| 89 | + while (__l != __l_end) { |
| 90 | + if (*__l != *__r) |
| 91 | + { |
| 92 | + return *__l < *__r ? -1 : 1; |
| 93 | + } |
| 94 | + ++__l; |
| 95 | + ++__r; |
| 96 | + } |
| 97 | + |
| 98 | + return 0;)) |
| 99 | +} |
| 100 | + |
| 101 | +_LIBCUDACXX_END_NAMESPACE_STD |
| 102 | + |
| 103 | +#endif // _CUDA_STD_CSTRING |
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