| /****************************************************************************** |
| * Copyright (C) 2009-2010, International Business Machines |
| * Corporation and others. All Rights Reserved. |
| ******************************************************************************* |
| */ |
| |
| #include "flagparser.h" |
| #include "filestrm.h" |
| #include "cstring.h" |
| #include "cmemory.h" |
| |
| #define DEFAULT_BUFFER_SIZE 512 |
| |
| static int32_t currentBufferSize = DEFAULT_BUFFER_SIZE; |
| |
| static void extractFlag(char* buffer, int32_t bufferSize, char* flag, int32_t flagSize, UErrorCode *status); |
| static int32_t getFlagOffset(const char *buffer, int32_t bufferSize); |
| |
| /* |
| * Opens the given fileName and reads in the information storing the data in flagBuffer. |
| */ |
| U_CAPI int32_t U_EXPORT2 |
| parseFlagsFile(const char *fileName, char **flagBuffer, int32_t flagBufferSize, int32_t numOfFlags, UErrorCode *status) { |
| char* buffer = uprv_malloc(sizeof(char) * currentBufferSize); |
| UBool allocateMoreSpace = FALSE; |
| int32_t i; |
| int32_t result = 0; |
| |
| FileStream *f = T_FileStream_open(fileName, "r"); |
| if (f == NULL) { |
| *status = U_FILE_ACCESS_ERROR; |
| return -1; |
| } |
| |
| if (buffer == NULL) { |
| *status = U_MEMORY_ALLOCATION_ERROR; |
| return -1; |
| } |
| |
| do { |
| if (allocateMoreSpace) { |
| allocateMoreSpace = FALSE; |
| currentBufferSize *= 2; |
| uprv_free(buffer); |
| buffer = uprv_malloc(sizeof(char) * currentBufferSize); |
| if (buffer == NULL) { |
| *status = U_MEMORY_ALLOCATION_ERROR; |
| return -1; |
| } |
| } |
| for (i = 0; i < numOfFlags; i++) { |
| if (T_FileStream_readLine(f, buffer, currentBufferSize) == NULL) { |
| *status = U_FILE_ACCESS_ERROR; |
| break; |
| } |
| |
| if (uprv_strlen(buffer) == (currentBufferSize - 1) && buffer[currentBufferSize-2] != '\n') { |
| /* Allocate more space for buffer if it didnot read the entrire line */ |
| allocateMoreSpace = TRUE; |
| T_FileStream_rewind(f); |
| break; |
| } else { |
| extractFlag(buffer, currentBufferSize, flagBuffer[i], flagBufferSize, status); |
| if (U_FAILURE(*status)) { |
| if (*status == U_BUFFER_OVERFLOW_ERROR) { |
| result = currentBufferSize; |
| } else { |
| result = -1; |
| } |
| break; |
| } |
| } |
| } |
| } while (allocateMoreSpace && U_SUCCESS(*status)); |
| |
| uprv_free(buffer); |
| |
| T_FileStream_close(f); |
| |
| if (U_SUCCESS(*status) && result == 0) { |
| currentBufferSize = DEFAULT_BUFFER_SIZE; |
| } |
| |
| return result; |
| } |
| |
| |
| /* |
| * Extract the setting after the '=' and store it in flag excluding the newline character. |
| */ |
| static void extractFlag(char* buffer, int32_t bufferSize, char* flag, int32_t flagSize, UErrorCode *status) { |
| int32_t i; |
| char *pBuffer; |
| int32_t offset; |
| UBool bufferWritten = FALSE; |
| |
| if (buffer[0] != 0) { |
| /* Get the offset (i.e. position after the '=') */ |
| offset = getFlagOffset(buffer, bufferSize); |
| pBuffer = buffer+offset; |
| for(i = 0;;i++) { |
| if (i >= flagSize) { |
| *status = U_BUFFER_OVERFLOW_ERROR; |
| return; |
| } |
| if (pBuffer[i+1] == 0) { |
| /* Indicates a new line character. End here. */ |
| flag[i] = 0; |
| break; |
| } |
| |
| flag[i] = pBuffer[i]; |
| if (i == 0) { |
| bufferWritten = TRUE; |
| } |
| } |
| } |
| |
| if (!bufferWritten) { |
| flag[0] = 0; |
| } |
| } |
| |
| /* |
| * Get the position after the '=' character. |
| */ |
| static int32_t getFlagOffset(const char *buffer, int32_t bufferSize) { |
| int32_t offset = 0; |
| |
| for (offset = 0; offset < bufferSize;offset++) { |
| if (buffer[offset] == '=') { |
| offset++; |
| break; |
| } |
| } |
| |
| if (offset == bufferSize || (offset - 1) == bufferSize) { |
| offset = 0; |
| } |
| |
| return offset; |
| } |