1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/*
* $Id: printbuf.h,v 1.4 2006/01/26 02:16:28 mclark Exp $
*
* Copyright (c) 2004, 2005 Metaparadigm Pte. Ltd.
* Michael Clark <michael@metaparadigm.com>
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See COPYING for details.
*
*
* Copyright (c) 2008-2009 Yahoo! Inc. All rights reserved.
* The copyrights to the contents of this file are licensed under the MIT License
* (https://www.opensource.org/licenses/mit-license.php)
*/
/**
* @file
* @brief Internal string buffer handling. Unless you're writing a
* json_object_to_json_string_fn implementation for use with
* json_object_set_serializer() direct use of this is not
* recommended.
*/
#ifndef _json_c_printbuf_h_
#define _json_c_printbuf_h_
#ifndef JSON_EXPORT
#if defined(_MSC_VER) && defined(JSON_C_DLL)
#define JSON_EXPORT __declspec(dllexport)
#else
#define JSON_EXPORT extern
#endif
#endif
#ifdef __cplusplus
extern "C" {
#endif
struct printbuf
{
char *buf;
int bpos;
int size;
};
typedef struct printbuf printbuf;
JSON_EXPORT struct printbuf *printbuf_new(void);
/* As an optimization, printbuf_memappend_fast() is defined as a macro
* that handles copying data if the buffer is large enough; otherwise
* it invokes printbuf_memappend() which performs the heavy
* lifting of realloc()ing the buffer and copying data.
*
* Your code should not use printbuf_memappend() directly unless it
* checks the return code. Use printbuf_memappend_fast() instead.
*/
JSON_EXPORT int printbuf_memappend(struct printbuf *p, const char *buf, int size);
#define printbuf_memappend_fast(p, bufptr, bufsize) \
do \
{ \
if ((p->size - p->bpos) > bufsize) \
{ \
memcpy(p->buf + p->bpos, (bufptr), bufsize); \
p->bpos += bufsize; \
p->buf[p->bpos] = '\0'; \
} \
else \
{ \
printbuf_memappend(p, (bufptr), bufsize); \
} \
} while (0)
#define printbuf_length(p) ((p)->bpos)
/**
* Results in a compile error if the argument is not a string literal.
*/
#define _printbuf_check_literal(mystr) ("" mystr)
/**
* This is an optimization wrapper around printbuf_memappend() that is useful
* for appending string literals. Since the size of string constants is known
* at compile time, using this macro can avoid a costly strlen() call. This is
* especially helpful when a constant string must be appended many times. If
* you got here because of a compilation error caused by passing something
* other than a string literal, use printbuf_memappend_fast() in conjunction
* with strlen().
*
* See also:
* printbuf_memappend_fast()
* printbuf_memappend()
* sprintbuf()
*/
#define printbuf_strappend(pb, str) \
printbuf_memappend((pb), _printbuf_check_literal(str), sizeof(str) - 1)
/**
* Set len bytes of the buffer to charvalue, starting at offset offset.
* Similar to calling memset(x, charvalue, len);
*
* The memory allocated for the buffer is extended as necessary.
*
* If offset is -1, this starts at the end of the current data in the buffer.
*/
JSON_EXPORT int printbuf_memset(struct printbuf *pb, int offset, int charvalue, int len);
/**
* Formatted print to printbuf.
*
* This function is the most expensive of the available functions for appending
* string data to a printbuf and should be used only where convenience is more
* important than speed. Avoid using this function in high performance code or
* tight loops; in these scenarios, consider using snprintf() with a static
* buffer in conjunction with one of the printbuf_*append() functions.
*
* See also:
* printbuf_memappend_fast()
* printbuf_memappend()
* printbuf_strappend()
*/
JSON_EXPORT int sprintbuf(struct printbuf *p, const char *msg, ...);
JSON_EXPORT void printbuf_reset(struct printbuf *p);
JSON_EXPORT void printbuf_free(struct printbuf *p);
#ifdef __cplusplus
}
#endif
#endif
|
