// Copyright 2021 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef V8_BASE_STRINGS_H_ #define V8_BASE_STRINGS_H_ #include "src/base/base-export.h" #include "src/base/macros.h" #include "src/base/vector.h" namespace v8 { namespace base { // Latin1/UTF-16 constants // Code-point values in Unicode 4.0 are 21 bits wide. // Code units in UTF-16 are 16 bits wide. using uc16 = uint16_t; using uc32 = uint32_t; constexpr int kUC16Size = sizeof(uc16); V8_BASE_EXPORT int PRINTF_FORMAT(2, 0) VSNPrintF(Vector<char> str, const char* format, va_list args); // Safe formatting print. Ensures that str is always null-terminated. // Returns the number of chars written, or -1 if output was truncated. V8_BASE_EXPORT int PRINTF_FORMAT(2, 3) SNPrintF(Vector<char> str, const char* format, ...); V8_BASE_EXPORT void StrNCpy(base::Vector<char> dest, const char* src, size_t n); // Returns the value (0 .. 15) of a hexadecimal character c. // If c is not a legal hexadecimal character, returns a value < 0. inline int HexValue(uc32 c) { c -= '0'; if (static_cast<unsigned>(c) <= 9) return c; c = (c | 0x20) - ('a' - '0'); // detect 0x11..0x16 and 0x31..0x36. if (static_cast<unsigned>(c) <= 5) return c + 10; return -1; } inline char HexCharOfValue(int value) { DCHECK(0 <= value && value <= 16); if (value < 10) return value + '0'; return value - 10 + 'A'; } } // namespace base } // namespace v8 #endif // V8_BASE_STRINGS_H_