1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2013 David Chisnall 5 * All rights reserved. 6 * 7 * This software was developed by SRI International and the University of 8 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237) 9 * ("CTSRD"), as part of the DARPA CRASH research programme. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef _UTIL_HH_ 34 #define _UTIL_HH_ 35 36 #include <memory> 37 #include <stdint.h> 38 #include <string> 39 #include <vector> 40 41 // If we aren't using C++11, then just ignore static asserts. 42 #if __cplusplus < 201103L 43 #ifndef static_assert 44 #define static_assert(x, y) ((void)0) 45 #endif 46 #endif 47 48 #ifdef MISSING_DIGITTOINT 49 namespace 50 { 51 /** 52 * Glibc doesn't have a definition of digittoint, so provide our own. 53 */ 54 inline int digittoint(int c) 55 { 56 switch (c) 57 { 58 default: 59 case '0': return 0; 60 case '1': return 1; 61 case '2': return 2; 62 case '3': return 3; 63 case '4': return 4; 64 case '5': return 5; 65 case '6': return 6; 66 case '7': return 7; 67 case '8': return 8; 68 case '9': return 9; 69 case 'a': return 10; 70 case 'b': return 11; 71 case 'c': return 12; 72 case 'd': return 13; 73 case 'e': return 14; 74 case 'f': return 15; 75 } 76 } 77 } 78 #endif 79 80 namespace dtc { 81 82 /** 83 * Type for a buffer of bytes. This is used for a lot of short-lived temporary 84 * variables, so may eventually be changed to something like LLVM's 85 * SmallVector, but currently the program runs in a tiny fraction of a second, 86 * so this is not an issue. 87 */ 88 typedef std::vector<uint8_t> byte_buffer; 89 90 /** 91 * Helper function to push a big endian value into a byte buffer. We use 92 * native-endian values for all of the in-memory data structures and only 93 * transform them into big endian form for output. 94 */ 95 template<typename T> 96 inline void push_big_endian(byte_buffer &v, T val) 97 { 98 static_assert(sizeof(T) > 1, 99 "Big endian doesn't make sense for single-byte values"); 100 for (int bit=(sizeof(T) - 1)*8 ; bit>=0 ; bit-= 8) 101 { 102 v.push_back((val >> bit) & 0xff); 103 } 104 } 105 106 void push_string(byte_buffer &v, const std::string &s, bool escapes=false); 107 108 /** 109 * Simple inline non-locale-aware check that this is a valid ASCII 110 * digit. 111 */ 112 inline bool isdigit(char c) 113 { 114 return (c >= '0') && (c <= '9'); 115 } 116 117 /** 118 * Simple inline non-locale-aware check that this is a valid ASCII 119 * hex digit. 120 */ 121 inline bool ishexdigit(char c) 122 { 123 return ((c >= '0') && (c <= '9')) || ((c >= 'a') && (c <= 'f')) || 124 ((c >= 'A') && (c <= 'F')); 125 } 126 127 /** 128 * Simple inline non-locale-aware check that this is a valid ASCII 129 * letter. 130 */ 131 inline bool isalpha(char c) 132 { 133 return ((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z')); 134 } 135 136 /** 137 * A wrapper around dirname(3) that handles inconsistencies relating to memory 138 * management between platforms and provides a std::string interface. 139 */ 140 std::string dirname(const std::string&); 141 142 /** 143 * A wrapper around basename(3) that handles inconsistencies relating to memory 144 * management between platforms and provides a std::string interface. 145 */ 146 std::string basename(const std::string&); 147 148 }// namespace dtc 149 150 #endif // !_UTIL_HH_ 151