1 /* -*- c++ -*- */ 2 /* 3 * Copyright (C) 2010 The Android Open Source Project 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * * Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * * Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in 13 * the documentation and/or other materials provided with the 14 * distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 19 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 20 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 22 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 23 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 24 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef ANDROID_ASTL_CHAR_TRAITS_H__ 31 #define ANDROID_ASTL_CHAR_TRAITS_H__ 32 33 #include <ios_pos_types.h> // For streampos 34 #include <cstdio> // For EOF 35 #include <cstring> // For memcmp, memchr, strlen 36 37 namespace std { 38 39 /** 40 * char_traits defines the basic types and constants (eof) used in 41 * string and stream as well as basic char manipulations. 42 * Android's support only char. The state_type is missing because we 43 * don't support multibyte strings. 44 */ 45 46 template<class _CharT> struct char_traits { 47 // Empty on purpose. You should use char_traits<char> only. 48 }; 49 50 template<> 51 struct char_traits<char> 52 { 53 typedef char char_type; 54 typedef int int_type; 55 typedef streampos pos_type; 56 typedef streamoff off_type; 57 58 static void assign(char& lhs, const char& rhs) { lhs = rhs; } 59 60 static bool eq(const char& lhs, const char& rhs) { return lhs == rhs; } 61 62 static bool lt(const char& lhs, const char& rhs) { return lhs < rhs; } 63 64 static int compare(const char* lhs, const char* rhs, size_t n) 65 { return std::memcmp(lhs, rhs, n); } 66 67 static size_t length(const char* str) { return std::strlen(str); } 68 69 static const char* find(const char* str, size_t n, const char& c) 70 { return static_cast<const char*>(std::memchr(str, c, n)); } 71 72 static char* move(char* lhs, const char* rhs, size_t n) 73 { return static_cast<char*>(std::memmove(lhs, rhs, n)); } 74 75 static char* copy(char* lhs, const char* rhs, size_t n) 76 { return static_cast<char*>(std::memcpy(lhs, rhs, n)); } 77 78 // Fill 'lhs' with 'n' occurences of 'c' 79 static char* assign(char* lhs, size_t n, char c) 80 { return static_cast<char*>(std::memset(lhs, c, n)); } 81 82 static char to_char(const int_type& c) { return static_cast<char>(c); } 83 84 static int_type to_int_type(const char& c) 85 { return static_cast<int_type>(static_cast<unsigned char>(c)); } 86 87 static bool eq_int_type(const int_type& lhs, const int_type& rhs) 88 { return lhs == rhs; } 89 90 static int_type eof() { return static_cast<int_type>(EOF); } 91 92 static int_type not_eof(const int_type& c) 93 { return (c == eof()) ? 0 : c; } 94 }; 95 96 } // namespace std 97 98 #endif 99