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 */
digittoint(int c)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>
push_big_endian(byte_buffer & v,T val)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 */
isdigit(char c)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 */
ishexdigit(char c)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 */
isalpha(char c)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