1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 * $FreeBSD$
33 */
34
35#include <string>
36#include <functional>
37#include <cstdio>
38#include <cstdlib>
39#include <cstring>
40#include <ctype.h>
41#include <libgen.h>
42
43#include "util.hh"
44
45using std::string;
46
47namespace dtc
48{
49
50void
51push_string(byte_buffer &buffer, const string &s, bool escapes)
52{
53	size_t length = s.size();
54	for (size_t i=0 ; i<length ; ++i)
55	{
56		uint8_t c = s[i];
57		if (escapes && c == '\\' && i+1 < length)
58		{
59			c = s[++i];
60			switch (c)
61			{
62				// For now, we just ignore invalid escape sequences.
63				default:
64				case '"':
65				case '\'':
66				case '\\':
67					break;
68				case 'a':
69					c = '\a';
70					break;
71				case 'b':
72					c = '\b';
73					break;
74				case 't':
75					c = '\t';
76					break;
77				case 'n':
78					c = '\n';
79					break;
80				case 'v':
81					c = '\v';
82					break;
83				case 'f':
84					c = '\f';
85					break;
86				case 'r':
87					c = '\r';
88					break;
89				case '0'...'7':
90				{
91					int v = digittoint(c);
92					if (i+1 < length && s[i+1] <= '7' && s[i+1] >= '0')
93					{
94						v <<= 3;
95						v |= digittoint(s[i+1]);
96						i++;
97						if (i+1 < length && s[i+1] <= '7' && s[i+1] >= '0')
98						{
99							v <<= 3;
100							v |= digittoint(s[i+1]);
101						}
102					}
103					c = (uint8_t)v;
104					break;
105				}
106				case 'x':
107				{
108					++i;
109					if (i >= length)
110					{
111						break;
112					}
113					int v = digittoint(s[i]);
114					if (i+1 < length && ishexdigit(s[i+1]))
115					{
116						v <<= 4;
117						v |= digittoint(s[++i]);
118					}
119					c = (uint8_t)v;
120					break;
121				}
122			}
123		}
124		buffer.push_back(c);
125	}
126}
127
128namespace {
129string
130dirbasename(std::function<char*(char*)> fn, const string &s)
131{
132	if (s == string())
133	{
134		return string();
135	}
136	std::unique_ptr<char, decltype(free)*> str = {strdup(s.c_str()), free};
137	string dn(fn(str.get()));
138	return dn;
139}
140}
141
142string dirname(const string &s)
143{
144	return dirbasename(::dirname, s);
145}
146
147string basename(const string &s)
148{
149	return dirbasename(::basename, s);
150}
151} // namespace dtc
152
153