mimil owns / aJSON

aJson is the attempt to port a complete JSON implementation to Arduino. It is based on the cJSON implementation, reduced in size and removing one or two feature. The current mbed implementation only supports FILE* as input so you will have to use a temporary file for parsing your json input. https://github.com/interactive-matter/aJson

Dependents:   WIZwikiREST20

utility/stringbuffer.c@1:6df1d1f1b372, 2012-08-28 (annotated)

Committer:
mimil
Date:
Tue Aug 28 08:16:29 2012 +0000
Revision:
1:6df1d1f1b372
Parent:
0:428cf9a51873 
first release of aJSON library for mbed

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mimil 1:6df1d1f1b372 1 /*
mimil 1:6df1d1f1b372 2 * aJson
mimil 1:6df1d1f1b372 3 * stringbuffer.c
mimil 1:6df1d1f1b372 4 *
mimil 1:6df1d1f1b372 5 * http://interactive-matter.org/
mimil 1:6df1d1f1b372 6 *
mimil 1:6df1d1f1b372 7 * This file is part of aJson.
mimil 1:6df1d1f1b372 8 *
mimil 1:6df1d1f1b372 9 * aJson is free software: you can redistribute it and/or modify
mimil 1:6df1d1f1b372 10 * it under the terms of the GNU General Public License as published by
mimil 1:6df1d1f1b372 11 * the Free Software Foundation, either version 3 of the License, or
mimil 1:6df1d1f1b372 12 * (at your option) any later version.
mimil 1:6df1d1f1b372 13 *
mimil 1:6df1d1f1b372 14 * aJson is distributed in the hope that it will be useful,
mimil 1:6df1d1f1b372 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
mimil 1:6df1d1f1b372 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
mimil 1:6df1d1f1b372 17 * GNU General Public License for more details.
mimil 1:6df1d1f1b372 18 * You should have received a copy of the GNU General Public License
mimil 1:6df1d1f1b372 19 * along with aJson. If not, see <http://www.gnu.org/licenses/>.
mimil 1:6df1d1f1b372 20 *
mimil 1:6df1d1f1b372 21 * Created on: 14.10.2010
mimil 1:6df1d1f1b372 22 * Author: marcus
mimil 1:6df1d1f1b372 23 */
mimil 1:6df1d1f1b372 24 #include <stdlib.h>
mimil 1:6df1d1f1b372 25 #include <string.h>
mimil 1:6df1d1f1b372 26 #include "stringbuffer.h"
mimil 1:6df1d1f1b372 27
mimil 1:6df1d1f1b372 28 //Default buffer size for strings
mimil 1:6df1d1f1b372 29 #define BUFFER_SIZE 256
mimil 1:6df1d1f1b372 30 //there is a static buffer allocated, which is used to decode strings to
mimil 1:6df1d1f1b372 31 //strings cannot be longer than the buffer
mimil 1:6df1d1f1b372 32 char global_buffer[BUFFER_SIZE];
mimil 1:6df1d1f1b372 33
mimil 1:6df1d1f1b372 34 string_buffer*
mimil 1:6df1d1f1b372 35 stringBufferCreate(void)
mimil 1:6df1d1f1b372 36 {
mimil 1:6df1d1f1b372 37 string_buffer* result = (string_buffer*)malloc(sizeof(string_buffer));
mimil 1:6df1d1f1b372 38 if (result == NULL)
mimil 1:6df1d1f1b372 39 {
mimil 1:6df1d1f1b372 40 return NULL;
mimil 1:6df1d1f1b372 41 }
mimil 1:6df1d1f1b372 42 result->string = global_buffer;
mimil 1:6df1d1f1b372 43 memset((void*) global_buffer, 0, BUFFER_SIZE);
mimil 1:6df1d1f1b372 44 //unused - but will be usefull after realloc got fixd
mimil 1:6df1d1f1b372 45 /* if (result->string==NULL) {
mimil 1:6df1d1f1b372 46 free(result);
mimil 1:6df1d1f1b372 47 return NULL;
mimil 1:6df1d1f1b372 48 }
mimil 1:6df1d1f1b372 49 result->memory=BUFFER_DEFAULT_SIZE;*/
mimil 1:6df1d1f1b372 50 result->memory = BUFFER_SIZE;
mimil 1:6df1d1f1b372 51 result->string_length = 0;
mimil 1:6df1d1f1b372 52 return result;
mimil 1:6df1d1f1b372 53 }
mimil 1:6df1d1f1b372 54
mimil 1:6df1d1f1b372 55 char
mimil 1:6df1d1f1b372 56 stringBufferAdd(char value, string_buffer* buffer)
mimil 1:6df1d1f1b372 57 {
mimil 1:6df1d1f1b372 58 if (buffer->string_length >= buffer->memory)
mimil 1:6df1d1f1b372 59 {
mimil 1:6df1d1f1b372 60 //this has to be enabled after realloc works
mimil 1:6df1d1f1b372 61 /*char* new_string = (char*) realloc((void*) buffer->string, (buffer->memory
mimil 1:6df1d1f1b372 62 + BUFFER_DEFAULT_SIZE) * sizeof(char));
mimil 1:6df1d1f1b372 63 if (new_string == NULL)
mimil 1:6df1d1f1b372 64 {
mimil 1:6df1d1f1b372 65 free(buffer->string);
mimil 1:6df1d1f1b372 66 buffer->string = NULL;
mimil 1:6df1d1f1b372 67 return -1;
mimil 1:6df1d1f1b372 68 } else {
mimil 1:6df1d1f1b372 69 buffer->string = new_string;
mimil 1:6df1d1f1b372 70 }
mimil 1:6df1d1f1b372 71 buffer->memory += BUFFER_DEFAULT_SIZE;*/
mimil 1:6df1d1f1b372 72 //in the meantime we just drop it
mimil 1:6df1d1f1b372 73 return 0; //EOF would be a better choice - but that breaks json decoding
mimil 1:6df1d1f1b372 74 }
mimil 1:6df1d1f1b372 75 buffer->string[buffer->string_length] = value;
mimil 1:6df1d1f1b372 76 buffer->string_length += 1;
mimil 1:6df1d1f1b372 77 return 0;
mimil 1:6df1d1f1b372 78 }
mimil 1:6df1d1f1b372 79
mimil 1:6df1d1f1b372 80 char*
mimil 1:6df1d1f1b372 81 stringBufferToString(string_buffer* buffer)
mimil 1:6df1d1f1b372 82 {
mimil 1:6df1d1f1b372 83 //this is the realloc dependent function - it does not work
mimil 1:6df1d1f1b372 84 // char* result = buffer->string;
mimil 1:6df1d1f1b372 85 //ensure that the string ends with 0
mimil 1:6df1d1f1b372 86 if (buffer->string_length == 0 || buffer->string[(buffer->string_length - 1)]
mimil 1:6df1d1f1b372 87 != 0)
mimil 1:6df1d1f1b372 88 {
mimil 1:6df1d1f1b372 89 stringBufferAdd(0, buffer);
mimil 1:6df1d1f1b372 90 }
mimil 1:6df1d1f1b372 91 /* char* string = realloc(result, buffer->string_length);
mimil 1:6df1d1f1b372 92 if (string==NULL) {
mimil 1:6df1d1f1b372 93 free(result);
mimil 1:6df1d1f1b372 94 }
mimil 1:6df1d1f1b372 95 buffer->string=NULL;
mimil 1:6df1d1f1b372 96 free(buffer);
mimil 1:6df1d1f1b372 97 return string;*/
mimil 1:6df1d1f1b372 98 char* result = (char*)malloc(buffer->string_length * sizeof(char));
mimil 1:6df1d1f1b372 99 if (result == NULL)
mimil 1:6df1d1f1b372 100 {
mimil 1:6df1d1f1b372 101 return NULL;
mimil 1:6df1d1f1b372 102 }
mimil 1:6df1d1f1b372 103 strcpy(result, global_buffer);
mimil 1:6df1d1f1b372 104 buffer->string = NULL;
mimil 1:6df1d1f1b372 105 free(buffer);
mimil 1:6df1d1f1b372 106 return result;
mimil 1:6df1d1f1b372 107 }
mimil 1:6df1d1f1b372 108
mimil 1:6df1d1f1b372 109 void
mimil 1:6df1d1f1b372 110 stringBufferFree(string_buffer* buffer)
mimil 1:6df1d1f1b372 111 {
mimil 1:6df1d1f1b372 112 if (buffer == NULL)
mimil 1:6df1d1f1b372 113 {
mimil 1:6df1d1f1b372 114 //hmm it was null before - whatever
mimil 1:6df1d1f1b372 115 return;
mimil 1:6df1d1f1b372 116 }
mimil 1:6df1d1f1b372 117 //this is not needed in this realloc free concept
mimil 1:6df1d1f1b372 118 /*
mimil 1:6df1d1f1b372 119 if (buffer->string!=NULL) {
mimil 1:6df1d1f1b372 120 free(buffer->string);
mimil 1:6df1d1f1b372 121 }
mimil 1:6df1d1f1b372 122 */
mimil 1:6df1d1f1b372 123 free(buffer);
mimil 1:6df1d1f1b372 124 }
mimil 1:6df1d1f1b372 125