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