blob: d9bcd439d06296c141067a301dc1c8b6f3d2165e (
plain)
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
|
/*
* Copyright (c) 2009-2016 Petri Lehtinen <petri@digip.org>
*
* Jansson is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include "strbuffer.h"
#include "jansson_private.h"
#include <stdlib.h>
#include <string.h>
#define STRBUFFER_MIN_SIZE 16
#define STRBUFFER_FACTOR 2
#define STRBUFFER_SIZE_MAX ((size_t)-1)
int strbuffer_init(strbuffer_t *strbuff) {
strbuff->size = STRBUFFER_MIN_SIZE;
strbuff->length = 0;
strbuff->value = jsonp_malloc(strbuff->size);
if (!strbuff->value)
return -1;
/* initialize to empty */
strbuff->value[0] = '\0';
return 0;
}
void strbuffer_close(strbuffer_t *strbuff) {
if (strbuff->value)
jsonp_free(strbuff->value);
strbuff->size = 0;
strbuff->length = 0;
strbuff->value = NULL;
}
void strbuffer_clear(strbuffer_t *strbuff) {
strbuff->length = 0;
strbuff->value[0] = '\0';
}
const char *strbuffer_value(const strbuffer_t *strbuff) { return strbuff->value; }
char *strbuffer_steal_value(strbuffer_t *strbuff) {
char *result = strbuff->value;
strbuff->value = NULL;
return result;
}
int strbuffer_append_byte(strbuffer_t *strbuff, char byte) {
return strbuffer_append_bytes(strbuff, &byte, 1);
}
int strbuffer_append_bytes(strbuffer_t *strbuff, const char *data, size_t size) {
if (size >= strbuff->size - strbuff->length) {
size_t new_size;
char *new_value;
/* avoid integer overflow */
if (strbuff->size > STRBUFFER_SIZE_MAX / STRBUFFER_FACTOR ||
size > STRBUFFER_SIZE_MAX - 1 ||
strbuff->length > STRBUFFER_SIZE_MAX - 1 - size)
return -1;
new_size = max(strbuff->size * STRBUFFER_FACTOR, strbuff->length + size + 1);
new_value = jsonp_malloc(new_size);
if (!new_value)
return -1;
memcpy(new_value, strbuff->value, strbuff->length);
jsonp_free(strbuff->value);
strbuff->value = new_value;
strbuff->size = new_size;
}
memcpy(strbuff->value + strbuff->length, data, size);
strbuff->length += size;
strbuff->value[strbuff->length] = '\0';
return 0;
}
char strbuffer_pop(strbuffer_t *strbuff) {
if (strbuff->length > 0) {
char c = strbuff->value[--strbuff->length];
strbuff->value[strbuff->length] = '\0';
return c;
} else
return '\0';
}
|
