1 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, 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 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef KMP_SAFE_C_API_H 11 #define KMP_SAFE_C_API_H 12 13 #include <type_traits> 14 #include "kmp_platform.h" 15 #include <string.h> 16 17 // Replacement for banned C API 18 19 // Not every unsafe call listed here is handled now, but keeping everything 20 // in one place should be handy for future maintenance. 21 #if KMP_OS_WINDOWS && KMP_MSVC_COMPAT 22 23 #define RSIZE_MAX_STR (4UL << 10) // 4KB 24 25 // _malloca was suggested, but it is not a drop-in replacement for _alloca 26 #define KMP_ALLOCA _alloca 27 28 #define KMP_MEMCPY_S memcpy_s 29 #define KMP_SNPRINTF sprintf_s 30 #define KMP_SSCANF sscanf_s 31 #define KMP_STRCPY_S strcpy_s 32 #define KMP_STRNCPY_S strncpy_s 33 #define KMP_STRNCAT_S strncat_s 34 35 // Use this only when buffer size is unknown 36 #define KMP_MEMCPY(dst, src, cnt) memcpy_s(dst, cnt, src, cnt) 37 38 template <typename T, bool B = std::is_array<T>::value> 39 struct kmp_get_rmax_t {}; 40 template <typename T> struct kmp_get_rmax_t<T, false> { 41 static const size_t value = RSIZE_MAX_STR; 42 }; 43 template <typename T> struct kmp_get_rmax_t<T, true> { 44 static const size_t value = sizeof(T); 45 }; 46 #define KMP_STRLEN(str) strnlen_s(str, kmp_get_rmax_t<decltype(str)>::value) 47 48 // Use this only when buffer size is unknown 49 #define KMP_STRNCPY(dst, src, cnt) strncpy_s(dst, cnt, src, cnt) 50 51 // _TRUNCATE insures buffer size > max string to print. 52 #define KMP_VSNPRINTF(dst, cnt, fmt, arg) \ 53 vsnprintf_s(dst, cnt, _TRUNCATE, fmt, arg) 54 55 #else // KMP_OS_WINDOWS 56 57 // For now, these macros use the existing API. 58 59 #if KMP_OS_NETBSD 60 #define KMP_ALLOCA __builtin_alloca 61 #else 62 #define KMP_ALLOCA alloca 63 #endif 64 #define KMP_MEMCPY_S(dst, bsz, src, cnt) memcpy(dst, src, cnt) 65 #define KMP_SNPRINTF snprintf 66 #define KMP_SSCANF sscanf 67 #define KMP_STRCPY_S(dst, bsz, src) strcpy(dst, src) 68 #define KMP_STRNCPY_S(dst, bsz, src, cnt) strncpy(dst, src, cnt) 69 #define KMP_STRNCAT_S(dst, bsz, src, cnt) strncat(dst, src, cnt) 70 #define KMP_VSNPRINTF vsnprintf 71 #define KMP_STRNCPY strncpy 72 #define KMP_STRLEN strlen 73 #define KMP_MEMCPY memcpy 74 75 #endif // KMP_OS_WINDOWS 76 77 // Offer truncated version of strncpy 78 static inline void __kmp_strncpy_truncate(char *buffer, size_t buf_size, 79 char const *src, size_t src_size) { 80 if (src_size >= buf_size) { 81 src_size = buf_size - 1; 82 } 83 KMP_STRNCPY_S(buffer, buf_size, src, src_size); 84 buffer[src_size] = '\0'; 85 } 86 87 #endif // KMP_SAFE_C_API_H 88