2 * Copyright (c) 2009-2011 Petri Lehtinen <petri@digip.org>
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.
11 #include "jansson_private.h"
12 #include "strbuffer.h"
14 #define STRBUFFER_MIN_SIZE 16
15 #define STRBUFFER_FACTOR 2
16 #define STRBUFFER_SIZE_MAX ((size_t)-1)
18 int strbuffer_init(strbuffer_t *strbuff)
20 strbuff->size = STRBUFFER_MIN_SIZE;
23 strbuff->value = jsonp_malloc(strbuff->size);
27 /* initialize to empty */
28 strbuff->value[0] = '\0';
32 void strbuffer_close(strbuffer_t *strbuff)
34 jsonp_free(strbuff->value);
37 strbuff->value = NULL;
40 void strbuffer_clear(strbuffer_t *strbuff)
43 strbuff->value[0] = '\0';
46 const char *strbuffer_value(const strbuffer_t *strbuff)
48 return strbuff->value;
51 char *strbuffer_steal_value(strbuffer_t *strbuff)
53 char *result = strbuff->value;
54 strbuffer_init(strbuff);
58 int strbuffer_append(strbuffer_t *strbuff, const char *string)
60 return strbuffer_append_bytes(strbuff, string, strlen(string));
63 int strbuffer_append_byte(strbuffer_t *strbuff, char byte)
65 return strbuffer_append_bytes(strbuff, &byte, 1);
68 int strbuffer_append_bytes(strbuffer_t *strbuff, const char *data, size_t size)
70 if(size >= strbuff->size - strbuff->length)
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)
81 new_size = max(strbuff->size * STRBUFFER_FACTOR,
82 strbuff->length + size + 1);
84 new_value = jsonp_malloc(new_size);
88 memcpy(new_value, strbuff->value, strbuff->length);
90 jsonp_free(strbuff->value);
91 strbuff->value = new_value;
92 strbuff->size = new_size;
95 memcpy(strbuff->value + strbuff->length, data, size);
96 strbuff->length += size;
97 strbuff->value[strbuff->length] = '\0';
102 char strbuffer_pop(strbuffer_t *strbuff)
104 if(strbuff->length > 0) {
105 char c = strbuff->value[--strbuff->length];
106 strbuff->value[strbuff->length] = '\0';