11872214087-1756

Committed 16 Nov 2024 06:12PM UTC coverage: 70.243% (+0.5%) from 69.712%

Build # 11872214087-1756

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github

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tstack

Commit Message

[build] disable regex101

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90.0

/src/shared_buffer.hh

/**
 * Copyright (c) 2014, Timothy Stack
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * * Neither the name of Timothy Stack nor the names of its contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @file shared_buffer.hh
 */

#ifndef shared_buffer_hh
#define shared_buffer_hh

#include <string>
#include <vector>

#include <stdlib.h>
#include <string.h>
#include <sys/types.h>

#include "base/auto_mem.hh"
#include "base/file_range.hh"
#include "base/intern_string.hh"
#include "base/line_range.hh"
#include "base/lnav_log.hh"
#include "scn/util/string_view.h"

class shared_buffer;

#define SHARED_BUFFER_TRACE 0

struct shared_buffer_ref {
public:
    shared_buffer_ref(char* data = nullptr, size_t len = 0)
        : sb_owner(nullptr), sb_data(data), sb_length(len)
    {
    }

    ~shared_buffer_ref() { this->disown(); }

    shared_buffer_ref(const shared_buffer_ref& other) = delete;

    shared_buffer_ref(shared_buffer_ref&& other) noexcept;

    shared_buffer_ref& operator=(const shared_buffer_ref& other) = delete;

    shared_buffer_ref clone() const
    {
        shared_buffer_ref retval;

        retval.copy_ref(*this);

        return retval;
    }

    shared_buffer_ref& operator=(shared_buffer_ref&& other);

    bool empty() const
    {
        return this->sb_data == nullptr || this->sb_length == 0;
    }

    const char* get_data() const { return this->sb_data; }

    const char* get_data_at(off_t offset) const
    {
        return &this->sb_data[offset];
    }

    size_t length() const { return this->sb_length; }

    shared_buffer_ref& rtrim(bool pred(char))
    {
        while (this->sb_length > 0 && pred(this->sb_data[this->sb_length - 1]))
        {
            this->sb_length -= 1;
        }

        return *this;
    }

    bool contains(const char* ptr) const
    {
        const char* buffer_end = this->sb_data + this->sb_length;

        return (this->sb_data <= ptr && ptr < buffer_end);
    }

    file_range::metadata& get_metadata() { return this->sb_metadata; }

    char* get_writable_data(size_t length)
    {
        if (this->take_ownership(length)) {
            return const_cast<char*>(this->sb_data);
        }

        return nullptr;
    }

    char* get_writable_data()
    {
        return this->get_writable_data(this->sb_length);
    }

    string_fragment to_string_fragment(off_t offset, size_t len) const
    {
        return string_fragment{
            this->sb_data, (int) offset, (int) (offset + len)};
    }

    string_fragment to_string_fragment() const
    {
        return string_fragment::from_bytes(this->sb_data, this->length());
    }

    scn::string_view to_string_view(const line_range& lr) const
    {
        return scn::string_view{
            this->get_data_at(lr.lr_start),
            this->get_data_at(lr.lr_end),
        };
    }

    using narrow_result = std::pair<const char*, size_t>;
    narrow_result narrow(size_t new_data, size_t new_length);

    void widen(narrow_result old_data_length);

    void share(shared_buffer& sb, const char* data, size_t len);

    bool subset(shared_buffer_ref& other, off_t offset, size_t len);

    void erase_ansi();

    bool take_ownership(size_t length);

    bool take_ownership() { return this->take_ownership(this->sb_length); }

    void disown();

private:
    void copy_ref(const shared_buffer_ref& other);

#if SHARED_BUFFER_TRACE
    auto_mem<char*> sb_backtrace;
#endif
    file_range::metadata sb_metadata;
    shared_buffer* sb_owner;
    const char* sb_data;
    size_t sb_length;
};

class shared_buffer {
public:
    ~shared_buffer() { this->invalidate_refs(); }

    void add_ref(shared_buffer_ref& ref) { this->sb_refs.push_back(&ref); }

    bool invalidate_refs()
    {
        bool retval = true;

        while (!this->sb_refs.empty()) {
            auto iter = this->sb_refs.begin();

            retval = retval && (*iter)->take_ownership();
        }

        return retval;
    }

    std::vector<shared_buffer_ref*> sb_refs;
};

inline std::string
to_string(const shared_buffer_ref& sbr)
{
    return {sbr.get_data(), sbr.length()};
}

#endif

1	/**
2	* Copyright (c) 2014, Timothy Stack
3	*
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 are met:
8	*
9	* * Redistributions of source code must retain the above copyright notice, this
10	* list of conditions and the following disclaimer.
11	* * 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	* * Neither the name of Timothy Stack nor the names of its contributors
15	* may be used to endorse or promote products derived from this software
16	* without specific prior written permission.
17	*
18	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
19	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21	* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
22	* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23	* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28	*
29	* @file shared_buffer.hh
30	*/
31
32	#ifndef shared_buffer_hh
33	#define shared_buffer_hh
34
35	#include <string>
36	#include <vector>
37
38	#include <stdlib.h>
39	#include <string.h>
40	#include <sys/types.h>
41
42	#include "base/auto_mem.hh"
43	#include "base/file_range.hh"
44	#include "base/intern_string.hh"
45	#include "base/line_range.hh"
46	#include "base/lnav_log.hh"
47	#include "scn/util/string_view.h"
48
49	class shared_buffer;
50
51	#define SHARED_BUFFER_TRACE 0
52
53	struct shared_buffer_ref {
54	public:
55	shared_buffer_ref(char* data = nullptr, size_t len = 0)	105,976✔
56	: sb_owner(nullptr), sb_data(data), sb_length(len)	105,976✔
57	{
58	}	105,976✔
59
60	~shared_buffer_ref() { this->disown(); }	456,042✔
61
62	shared_buffer_ref(const shared_buffer_ref& other) = delete;
63
64	shared_buffer_ref(shared_buffer_ref&& other) noexcept;
65
66	shared_buffer_ref& operator=(const shared_buffer_ref& other) = delete;
67
68	shared_buffer_ref clone() const	6,177✔
69	{
70	shared_buffer_ref retval;	6,177✔
71
72	retval.copy_ref(*this);	6,177✔
73
74	return retval;	6,177✔
75	}	×
76
77	shared_buffer_ref& operator=(shared_buffer_ref&& other);
78
79	bool empty() const	6,288✔
80	{
81	return this->sb_data == nullptr \|\| this->sb_length == 0;	6,288✔
82	}
83
84	const char* get_data() const { return this->sb_data; }	642,098✔
85
86	const char* get_data_at(off_t offset) const	378,751✔
87	{
88	return &this->sb_data[offset];	378,751✔
89	}
90
91	size_t length() const { return this->sb_length; }	601,670✔
92
93	shared_buffer_ref& rtrim(bool pred(char))	32,301✔
94	{
95	while (this->sb_length > 0 && pred(this->sb_data[this->sb_length - 1]))	42,782✔
96	{
97	this->sb_length -= 1;	10,481✔
98	}
99
100	return *this;	32,301✔
101	}
102
103	bool contains(const char* ptr) const	21,670✔
104	{
105	const char* buffer_end = this->sb_data + this->sb_length;	21,670✔
106
107	return (this->sb_data <= ptr && ptr < buffer_end);	21,670✔
108	}
109
110	file_range::metadata& get_metadata() { return this->sb_metadata; }	85,083✔
111
112	char* get_writable_data(size_t length)	104✔
113	{
114	if (this->take_ownership(length)) {	104✔
115	return const_cast<char*>(this->sb_data);	104✔
116	}
117
118	return nullptr;	×
119	}
120
121	char* get_writable_data()	104✔
122	{
123	return this->get_writable_data(this->sb_length);	104✔
124	}
125
126	string_fragment to_string_fragment(off_t offset, size_t len) const	×
127	{
128	return string_fragment{	×
129	this->sb_data, (int) offset, (int) (offset + len)};	×
130	}
131
132	string_fragment to_string_fragment() const	579,887✔
133	{
134	return string_fragment::from_bytes(this->sb_data, this->length());	579,887✔
135	}
136
137	scn::string_view to_string_view(const line_range& lr) const	189,367✔
138	{
139	return scn::string_view{	189,367✔
140	this->get_data_at(lr.lr_start),	189,367✔
141	this->get_data_at(lr.lr_end),	189,367✔
142	};	189,367✔
143	}
144
145	using narrow_result = std::pair<const char*, size_t>;
146	narrow_result narrow(size_t new_data, size_t new_length);
147
148	void widen(narrow_result old_data_length);
149
150	void share(shared_buffer& sb, const char* data, size_t len);
151
152	bool subset(shared_buffer_ref& other, off_t offset, size_t len);
153
154	void erase_ansi();
155
156	bool take_ownership(size_t length);
157
158	bool take_ownership() { return this->take_ownership(this->sb_length); }	1,662✔
159
160	void disown();
161
162	private:
163	void copy_ref(const shared_buffer_ref& other);
164
165	#if SHARED_BUFFER_TRACE
166	auto_mem<char*> sb_backtrace;
167	#endif
168	file_range::metadata sb_metadata;
169	shared_buffer* sb_owner;
170	const char* sb_data;
171	size_t sb_length;
172	};
173
174	class shared_buffer {
175	public:
176	~shared_buffer() { this->invalidate_refs(); }	32,426✔
177
178	void add_ref(shared_buffer_ref& ref) { this->sb_refs.push_back(&ref); }	70,691✔
179
180	bool invalidate_refs()	37,688✔
181	{
182	bool retval = true;	37,688✔
183
184	while (!this->sb_refs.empty()) {	39,350✔
185	auto iter = this->sb_refs.begin();	1,662✔
186
187	retval = retval && (*iter)->take_ownership();	1,662✔
188	}
189
190	return retval;	37,688✔
191	}
192
193	std::vector<shared_buffer_ref*> sb_refs;
194	};
195
196	inline std::string
197	to_string(const shared_buffer_ref& sbr)	2,184✔
198	{
199	return {sbr.get_data(), sbr.length()};	2,184✔
200	}
201
202	#endif

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