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[proxmark3-svn] / client / jansson / strbuffer.c
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1/*
2 * Copyright (c) 2009-2016 Petri Lehtinen <petri@digip.org>
3 *
4 * Jansson is free software; you can redistribute it and/or modify
5 * it under the terms of the MIT license. See LICENSE for details.
6 */
7
8#ifndef _GNU_SOURCE
9#define _GNU_SOURCE
10#endif
11
12#include <stdlib.h>
13#include <string.h>
14#include "jansson_private.h"
15#include "strbuffer.h"
16
17#define STRBUFFER_MIN_SIZE 16
18#define STRBUFFER_FACTOR 2
19#define STRBUFFER_SIZE_MAX ((size_t)-1)
20
21int strbuffer_init(strbuffer_t *strbuff)
22{
23 strbuff->size = STRBUFFER_MIN_SIZE;
24 strbuff->length = 0;
25
26 strbuff->value = jsonp_malloc(strbuff->size);
27 if(!strbuff->value)
28 return -1;
29
30 /* initialize to empty */
31 strbuff->value[0] = '\0';
32 return 0;
33}
34
35void strbuffer_close(strbuffer_t *strbuff)
36{
37 if(strbuff->value)
38 jsonp_free(strbuff->value);
39
40 strbuff->size = 0;
41 strbuff->length = 0;
42 strbuff->value = NULL;
43}
44
45void strbuffer_clear(strbuffer_t *strbuff)
46{
47 strbuff->length = 0;
48 strbuff->value[0] = '\0';
49}
50
51const char *strbuffer_value(const strbuffer_t *strbuff)
52{
53 return strbuff->value;
54}
55
56char *strbuffer_steal_value(strbuffer_t *strbuff)
57{
58 char *result = strbuff->value;
59 strbuff->value = NULL;
60 return result;
61}
62
63int strbuffer_append_byte(strbuffer_t *strbuff, char byte)
64{
65 return strbuffer_append_bytes(strbuff, &byte, 1);
66}
67
68int strbuffer_append_bytes(strbuffer_t *strbuff, const char *data, size_t size)
69{
70 if(size >= strbuff->size - strbuff->length)
71 {
72 size_t new_size;
73 char *new_value;
74
75 /* avoid integer overflow */
76 if (strbuff->size > STRBUFFER_SIZE_MAX / STRBUFFER_FACTOR
77 || size > STRBUFFER_SIZE_MAX - 1
78 || strbuff->length > STRBUFFER_SIZE_MAX - 1 - size)
79 return -1;
80
81 new_size = max(strbuff->size * STRBUFFER_FACTOR,
82 strbuff->length + size + 1);
83
84 new_value = jsonp_malloc(new_size);
85 if(!new_value)
86 return -1;
87
88 memcpy(new_value, strbuff->value, strbuff->length);
89
90 jsonp_free(strbuff->value);
91 strbuff->value = new_value;
92 strbuff->size = new_size;
93 }
94
95 memcpy(strbuff->value + strbuff->length, data, size);
96 strbuff->length += size;
97 strbuff->value[strbuff->length] = '\0';
98
99 return 0;
100}
101
102char strbuffer_pop(strbuffer_t *strbuff)
103{
104 if(strbuff->length > 0) {
105 char c = strbuff->value[--strbuff->length];
106 strbuff->value[strbuff->length] = '\0';
107 return c;
108 }
109 else
110 return '\0';
111}
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