Azure IoT common library
Dependents: STM32F746_iothub_client_sample_mqtt f767zi_mqtt iothub_client_sample_amqp iothub_client_sample_http ... more
string_tokenizer.c
- Committer:
- AzureIoTClient
- Date:
- 2017-01-13
- Revision:
- 18:6d8a413a4d9a
- Parent:
- 7:1af47e3a19b6
- Child:
- 19:2e0811512ceb
File content as of revision 18:6d8a413a4d9a:
// Copyright (c) Microsoft. All rights reserved. // Licensed under the MIT license. See LICENSE file in the project root for full license information. // // PUT NO INCLUDES BEFORE HERE // #ifdef _CRTDBG_MAP_ALLOC #include <crtdbg.h> #endif #include "azure_c_shared_utility/gballoc.h" // // PUT NO CLIENT LIBRARY INCLUDES BEFORE HERE // #include <stdlib.h> #include <stdbool.h> #include "azure_c_shared_utility/string_tokenizer.h" #include "azure_c_shared_utility/xlogging.h" #include "azure_c_shared_utility/crt_abstractions.h" typedef struct STRING_TOKEN_TAG { const char* inputString; const char* currentPos; size_t sizeOfinputString; } STRING_TOKEN; STRING_TOKENIZER_HANDLE STRING_TOKENIZER_create(STRING_HANDLE handle) { STRING_TOKENIZER_HANDLE result; /* Codes_SRS_STRING_04_001: [STRING_TOKENIZER_create shall return an NULL STRING_TOKENIZER_HANDLE if parameter handle is NULL] */ if (handle == NULL) { LogError("Invalid Argument. Handle cannot be NULL."); result = NULL; } else { /* 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] */ result = STRING_TOKENIZER_create_from_char(STRING_c_str(handle)); } return result; } extern STRING_TOKENIZER_HANDLE STRING_TOKENIZER_create_from_char(const char* input) { STRING_TOKEN *result; char* inputStringToMalloc; /* Codes_SRS_STRING_07_001: [STRING_TOKENIZER_create shall return an NULL STRING_TOKENIZER_HANDLE if parameter input is NULL] */ if (input == NULL) { LogError("Invalid Argument. Handle cannot be NULL."); result = NULL; } /* 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] */ else if ((result = (STRING_TOKEN*)malloc(sizeof(STRING_TOKEN))) == NULL) { LogError("Memory Allocation failed. Cannot allocate STRING_TOKENIZER."); } else if ((mallocAndStrcpy_s(&inputStringToMalloc, input)) != 0) { LogError("Memory Allocation Failed. Cannot allocate and copy string Content."); free(result); result = NULL; } else { result->inputString = inputStringToMalloc; result->currentPos = result->inputString; //Current Pos will point to the initial position of Token. result->sizeOfinputString = strlen(result->inputString); //Calculate Size of Current String } return (STRING_TOKENIZER_HANDLE)result; } int STRING_TOKENIZER_get_next_token(STRING_TOKENIZER_HANDLE tokenizer, STRING_HANDLE output, const char* delimiters) { int result; /* Codes_SRS_STRING_04_004: [STRING_TOKENIZER_get_next_token shall return a nonzero value if any of the 3 parameters is NULL] */ if (tokenizer == NULL || output == NULL || delimiters == NULL) { result = __LINE__; } else { STRING_TOKEN* token = (STRING_TOKEN*)tokenizer; /* 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.] */ size_t remainingInputStringSize = token->sizeOfinputString - (token->currentPos - token->inputString); size_t delimitterSize = strlen(delimiters); /* First Check if we reached the end of the string*/ /* Codes_SRS_STRING_TOKENIZER_04_014: [STRING_TOKENIZER_get_next_token shall return nonzero value if t contains an empty string.] */ if (remainingInputStringSize == 0) { result = __LINE__; } else if (delimitterSize == 0) { LogError("Empty delimiters parameter."); result = __LINE__; } else { size_t i; /* 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] */ for (i = 0; i < remainingInputStringSize; i++) { size_t j; bool foundDelimitter = false; for (j = 0; j < delimitterSize; j++) { if (token->currentPos[i] == delimiters[j]) { foundDelimitter = true; break; } } /* Codes_SRS_STRING_04_007: [If such a character is found, STRING_TOKENIZER_get_next_token consider it as the start of a token.] */ if (!foundDelimitter) { break; } } /* 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).] */ //At this point update Current Pos to the character of the last token found or end of String. token->currentPos += i; //Update the remainingInputStringSize remainingInputStringSize -= i; /* 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).] */ if (remainingInputStringSize == 0) { result = __LINE__; } else { bool foundDelimitter = false; char* endOfTokenPosition=NULL; size_t amountOfCharactersToCopy; size_t j; //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. /*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.] */ /* 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.] */ /* 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.] */ for (j = 0; j < delimitterSize; j++) { if ((endOfTokenPosition = strchr(token->currentPos, delimiters[j])) != NULL) { foundDelimitter = true; break; } } //If token not found, than update the EndOfToken to the end of the inputString; if (endOfTokenPosition == NULL) { amountOfCharactersToCopy = remainingInputStringSize; } else { amountOfCharactersToCopy = endOfTokenPosition - token->currentPos; } //copy here the string to output. if (STRING_copy_n(output, token->currentPos, amountOfCharactersToCopy) != 0) { LogError("Problem copying token to output String."); result = __LINE__; } else { //Update the Current position. //Check if end of String reached so, currentPos points to the end of String. if (foundDelimitter) { token->currentPos += amountOfCharactersToCopy + 1; } else { token->currentPos += amountOfCharactersToCopy; } result = 0; //Result will be on the output. } } } } return result; } /* Codes_SRS_STRING_TOKENIZER_04_012: [STRING_TOKENIZER_destroy shall free the memory allocated by the STRING_TOKENIZER_create ] */ void STRING_TOKENIZER_destroy(STRING_TOKENIZER_HANDLE t) { /* Codes_SRS_STRING_TOKENIZER_04_013: [When the t argument is NULL, then STRING_TOKENIZER_destroy shall not attempt to free] */ if (t != NULL) { STRING_TOKEN* value = (STRING_TOKEN*)t; free((char*)value->inputString); value->inputString = NULL; free(value); } }