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111 lines
2.6 KiB
111 lines
2.6 KiB
/* |
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* Copyright (c) 2009-2012 Petri Lehtinen <petri@digip.org> |
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* |
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* Jansson is free software; you can redistribute it and/or modify |
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* it under the terms of the MIT license. See LICENSE for details. |
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*/ |
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#define _GNU_SOURCE |
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#include <stdlib.h> |
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#include <string.h> |
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#include "jansson_private.h" |
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#include "strbuffer.h" |
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#define STRBUFFER_MIN_SIZE 16 |
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#define STRBUFFER_FACTOR 2 |
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#define STRBUFFER_SIZE_MAX ((size_t)-1) |
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int strbuffer_init(strbuffer_t *strbuff) |
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{ |
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strbuff->size = STRBUFFER_MIN_SIZE; |
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strbuff->length = 0; |
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strbuff->value = jsonp_malloc(strbuff->size); |
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if(!strbuff->value) |
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return -1; |
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/* initialize to empty */ |
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strbuff->value[0] = '\0'; |
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return 0; |
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} |
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void strbuffer_close(strbuffer_t *strbuff) |
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{ |
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jsonp_free(strbuff->value); |
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strbuff->size = 0; |
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strbuff->length = 0; |
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strbuff->value = NULL; |
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} |
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void strbuffer_clear(strbuffer_t *strbuff) |
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{ |
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strbuff->length = 0; |
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strbuff->value[0] = '\0'; |
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} |
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const char *strbuffer_value(const strbuffer_t *strbuff) |
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{ |
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return strbuff->value; |
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} |
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char *strbuffer_steal_value(strbuffer_t *strbuff) |
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{ |
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char *result = strbuff->value; |
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strbuffer_init(strbuff); |
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return result; |
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} |
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int strbuffer_append(strbuffer_t *strbuff, const char *string) |
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{ |
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return strbuffer_append_bytes(strbuff, string, strlen(string)); |
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} |
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int strbuffer_append_byte(strbuffer_t *strbuff, char byte) |
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{ |
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return strbuffer_append_bytes(strbuff, &byte, 1); |
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} |
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int strbuffer_append_bytes(strbuffer_t *strbuff, const char *data, size_t size) |
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{ |
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if(size >= strbuff->size - strbuff->length) |
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{ |
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size_t new_size; |
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char *new_value; |
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/* avoid integer overflow */ |
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if (strbuff->size > STRBUFFER_SIZE_MAX / STRBUFFER_FACTOR |
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|| size > STRBUFFER_SIZE_MAX - 1 |
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|| strbuff->length > STRBUFFER_SIZE_MAX - 1 - size) |
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return -1; |
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new_size = max(strbuff->size * STRBUFFER_FACTOR, |
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strbuff->length + size + 1); |
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new_value = jsonp_malloc(new_size); |
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if(!new_value) |
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return -1; |
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memcpy(new_value, strbuff->value, strbuff->length); |
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jsonp_free(strbuff->value); |
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strbuff->value = new_value; |
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strbuff->size = new_size; |
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} |
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memcpy(strbuff->value + strbuff->length, data, size); |
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strbuff->length += size; |
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strbuff->value[strbuff->length] = '\0'; |
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return 0; |
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} |
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char strbuffer_pop(strbuffer_t *strbuff) |
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{ |
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if(strbuff->length > 0) { |
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char c = strbuff->value[--strbuff->length]; |
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strbuff->value[strbuff->length] = '\0'; |
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return c; |
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} |
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else |
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return '\0'; |
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}
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