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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <AK/PrintfImplementation.h>
28#include <AK/StdLibExtras.h>
29#include <KBufferBuilder.h>
30#include <stdarg.h>
31
32namespace Kernel {
33
34inline bool KBufferBuilder::can_append(size_t size) const
35{
36 bool has_space = ((m_size + size) < m_buffer.size());
37 ASSERT(has_space);
38 return has_space;
39}
40
41KBuffer KBufferBuilder::build()
42{
43 m_buffer.set_size(m_size);
44 return m_buffer;
45}
46
47KBufferBuilder::KBufferBuilder()
48 : m_buffer(KBuffer::create_with_size(4 * MB, Region::Access::Read | Region::Access::Write))
49{
50}
51
52void KBufferBuilder::append(const StringView& str)
53{
54 if (str.is_empty())
55 return;
56 if (!can_append(str.length()))
57 return;
58 memcpy(insertion_ptr(), str.characters_without_null_termination(), str.length());
59 m_size += str.length();
60}
61
62void KBufferBuilder::append(const char* characters, int length)
63{
64 if (!length)
65 return;
66 if (!can_append(length))
67 return;
68 memcpy(insertion_ptr() + m_size, characters, length);
69 m_size += length;
70}
71
72void KBufferBuilder::append(char ch)
73{
74 if (!can_append(1))
75 return;
76 insertion_ptr()[0] = ch;
77 m_size += 1;
78}
79
80void KBufferBuilder::appendvf(const char* fmt, va_list ap)
81{
82 printf_internal([this](char*&, char ch) {
83 append(ch);
84 },
85 nullptr, fmt, ap);
86}
87
88void KBufferBuilder::appendf(const char* fmt, ...)
89{
90 va_list ap;
91 va_start(ap, fmt);
92 appendvf(fmt, ap);
93 va_end(ap);
94}
95
96}