1 | // Copyright (c) Microsoft. All rights reserved.
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2 | // Licensed under the MIT license. See LICENSE file in the project root for full license information.
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3 |
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4 | #include <stdlib.h>
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5 | #include <stdbool.h>
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6 | #include "azure_c_shared_utility/gballoc.h"
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7 | #include "azure_c_shared_utility/string_tokenizer.h"
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8 | #include "azure_c_shared_utility/optimize_size.h"
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9 | #include "azure_c_shared_utility/xlogging.h"
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10 | #include "azure_c_shared_utility/crt_abstractions.h"
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11 |
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12 | typedef struct STRING_TOKEN_TAG
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13 | {
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14 | const char* inputString;
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15 | const char* currentPos;
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16 | size_t sizeOfinputString;
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17 | } STRING_TOKEN;
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18 |
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19 | STRING_TOKENIZER_HANDLE STRING_TOKENIZER_create(STRING_HANDLE handle)
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20 | {
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21 | STRING_TOKENIZER_HANDLE result;
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22 |
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23 | /* Codes_SRS_STRING_04_001: [STRING_TOKENIZER_create shall return an NULL STRING_TOKENIZER_HANDLE if parameter handle is NULL] */
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24 | if (handle == NULL)
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25 | {
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26 | LogError("Invalid Argument. Handle cannot be NULL.");
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27 | result = NULL;
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28 | }
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29 | else
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30 | {
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31 | /* Codes_SRS_STRING_04_002: [STRING_TOKENIZER_create shall allocate a new STRING_TOKENIZER_HANDLE having the content of the STRING_HANDLE copied and current position pointing at the beginning of the string] */
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32 | result = STRING_TOKENIZER_create_from_char(STRING_c_str(handle));
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33 | }
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34 |
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35 | return result;
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36 | }
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37 |
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38 | extern STRING_TOKENIZER_HANDLE STRING_TOKENIZER_create_from_char(const char* input)
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39 | {
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40 | STRING_TOKEN *result;
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41 | char* inputStringToMalloc;
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42 |
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43 | /* Codes_SRS_STRING_07_001: [STRING_TOKENIZER_create shall return an NULL STRING_TOKENIZER_HANDLE if parameter input is NULL] */
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44 | if (input == NULL)
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45 | {
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46 | LogError("Invalid Argument. Handle cannot be NULL.");
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47 | result = NULL;
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48 | }
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49 | /* Codes_SRS_STRING_07_002: [STRING_TOKENIZER_create shall allocate a new STRING_TOKENIZER_HANDLE having the content of the STRING_HANDLE copied and current position pointing at the beginning of the string] */
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50 | else if ((result = (STRING_TOKEN*)calloc(1, sizeof(STRING_TOKEN))) == NULL)
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51 | {
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52 | LogError("Memory Allocation failed. Cannot allocate STRING_TOKENIZER.");
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53 | }
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54 | else if ((mallocAndStrcpy_s(&inputStringToMalloc, input)) != 0)
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55 | {
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56 | LogError("Memory Allocation Failed. Cannot allocate and copy string Content.");
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57 | free(result);
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58 | result = NULL;
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59 | }
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60 | else
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61 | {
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62 | result->inputString = inputStringToMalloc;
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63 | result->currentPos = result->inputString; //Current Pos will point to the initial position of Token.
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64 | result->sizeOfinputString = strlen(result->inputString); //Calculate Size of Current String
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65 | }
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66 | return (STRING_TOKENIZER_HANDLE)result;
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67 | }
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68 |
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69 | int STRING_TOKENIZER_get_next_token(STRING_TOKENIZER_HANDLE tokenizer, STRING_HANDLE output, const char* delimiters)
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70 | {
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71 | int result;
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72 | /* Codes_SRS_STRING_04_004: [STRING_TOKENIZER_get_next_token shall return a nonzero value if any of the 3 parameters is NULL] */
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73 | if (tokenizer == NULL || output == NULL || delimiters == NULL)
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74 | {
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75 | result = MU_FAILURE;
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76 | }
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77 | else
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78 | {
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79 | STRING_TOKEN* token = (STRING_TOKEN*)tokenizer;
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80 | /* Codes_SRS_STRING_04_011: [Each subsequent call to STRING_TOKENIZER_get_next_token starts searching from the saved position on t and behaves as described above.] */
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81 | size_t remainingInputStringSize = token->sizeOfinputString - (token->currentPos - token->inputString);
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82 | size_t delimitterSize = strlen(delimiters);
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83 |
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84 | /* First Check if we reached the end of the string*/
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85 | /* Codes_SRS_STRING_TOKENIZER_04_014: [STRING_TOKENIZER_get_next_token shall return nonzero value if t contains an empty string.] */
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86 | if (remainingInputStringSize == 0)
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87 | {
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88 | result = MU_FAILURE;
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89 | }
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90 | else if (delimitterSize == 0)
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91 | {
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92 | LogError("Empty delimiters parameter.");
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93 | result = MU_FAILURE;
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94 | }
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95 | else
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96 | {
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97 | size_t i;
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98 | /* Codes_SRS_STRING_04_005: [STRING_TOKENIZER_get_next_token searches the string inside STRING_TOKENIZER_HANDLE for the first character that is NOT contained in the current delimiter] */
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99 | for (i = 0; i < remainingInputStringSize; i++)
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100 | {
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101 | size_t j;
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102 |
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103 | bool foundDelimitter = false;
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104 | for (j = 0; j < delimitterSize; j++)
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105 | {
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106 | if (token->currentPos[i] == delimiters[j])
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107 | {
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108 | foundDelimitter = true;
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109 | break;
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110 | }
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111 | }
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112 |
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113 | /* Codes_SRS_STRING_04_007: [If such a character is found, STRING_TOKENIZER_get_next_token consider it as the start of a token.] */
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114 | if (!foundDelimitter)
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115 | {
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116 | break;
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117 | }
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118 | }
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119 |
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120 | /* Codes_SRS_STRING_04_006: [If no such character is found, then STRING_TOKENIZER_get_next_token shall return a nonzero Value (You've reach the end of the string or the string consists with only delimiters).] */
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121 | //At this point update Current Pos to the character of the last token found or end of String.
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122 | token->currentPos += i;
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123 |
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124 | //Update the remainingInputStringSize
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125 | remainingInputStringSize -= i;
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126 |
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127 | /* Codes_SRS_STRING_04_006: [If no such character is found, then STRING_TOKENIZER_get_next_token shall return a nonzero Value (You've reach the end of the string or the string consists with only delimiters).] */
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128 | if (remainingInputStringSize == 0)
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129 | {
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130 | result = MU_FAILURE;
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131 | }
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132 | else
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133 | {
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134 | bool foundDelimitter = false;
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135 | const char* endOfTokenPosition=NULL;
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136 | size_t amountOfCharactersToCopy;
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137 | size_t j;
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138 | //At this point the Current Pos is pointing to a character that is point to a nonDelimiter. So, now search for a Delimiter, till the end of the String.
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139 | /*Codes_SRS_STRING_04_008: [STRING_TOKENIZER_get_next_token than searches from the start of a token for a character that is contained in the delimiters string.] */
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140 | /* Codes_SRS_STRING_04_009: [If no such character is found, STRING_TOKENIZER_get_next_token extends the current token to the end of the string inside t, copies the token to output and returns 0.] */
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141 | /* Codes_SRS_STRING_04_010: [If such a character is found, STRING_TOKENIZER_get_next_token consider it the end of the token and copy it's content to output, updates the current position inside t to the next character and returns 0.] */
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142 | for (j = 0; j < delimitterSize; j++)
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143 | {
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144 | if ((endOfTokenPosition = strchr(token->currentPos, delimiters[j])) != NULL)
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145 | {
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146 | foundDelimitter = true;
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147 | break;
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148 | }
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149 | }
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150 |
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151 | //If token not found, than update the EndOfToken to the end of the inputString;
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152 | if (endOfTokenPosition == NULL)
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153 | {
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154 | amountOfCharactersToCopy = remainingInputStringSize;
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155 | }
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156 | else
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157 | {
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158 | amountOfCharactersToCopy = endOfTokenPosition - token->currentPos;
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159 | }
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160 |
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161 | //copy here the string to output.
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162 | if (STRING_copy_n(output, token->currentPos, amountOfCharactersToCopy) != 0)
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163 | {
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164 | LogError("Problem copying token to output String.");
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165 | result = MU_FAILURE;
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166 | }
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167 | else
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168 | {
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169 | //Update the Current position.
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170 | //Check if end of String reached so, currentPos points to the end of String.
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171 | if (foundDelimitter)
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172 | {
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173 | token->currentPos += amountOfCharactersToCopy + 1;
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174 | }
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175 | else
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176 | {
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177 | token->currentPos += amountOfCharactersToCopy;
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178 | }
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179 |
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180 | result = 0; //Result will be on the output.
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181 | }
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182 | }
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183 | }
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184 | }
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185 |
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186 | return result;
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187 | }
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188 |
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189 |
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190 | /* Codes_SRS_STRING_TOKENIZER_04_012: [STRING_TOKENIZER_destroy shall free the memory allocated by the STRING_TOKENIZER_create ] */
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191 | void STRING_TOKENIZER_destroy(STRING_TOKENIZER_HANDLE t)
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192 | {
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193 | /* Codes_SRS_STRING_TOKENIZER_04_013: [When the t argument is NULL, then STRING_TOKENIZER_destroy shall not attempt to free] */
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194 | if (t != NULL)
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195 | {
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196 | STRING_TOKEN* value = (STRING_TOKEN*)t;
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197 | free((char*)value->inputString);
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198 | value->inputString = NULL;
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199 | free(value);
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200 | }
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201 | }
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202 |
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