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/******************************************************************************
* Copyright (C) 2009-2015, 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 int32_t extractFlag(char* buffer, int32_t bufferSize, char* flag, int32_t flagSize, const char ** flagNames, int32_t numOfFlags, 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, const char ** flagNames, int32_t numOfFlags, UErrorCode *status) {
char* buffer = NULL;
char* tmpFlagBuffer = NULL;
UBool allocateMoreSpace = FALSE;
int32_t idx, i;
int32_t result = 0;
FileStream *f = T_FileStream_open(fileName, "r");
if (f == NULL) {
*status = U_FILE_ACCESS_ERROR;
goto parseFlagsFile_cleanup;
}
buffer = uprv_malloc(sizeof(char) * currentBufferSize);
tmpFlagBuffer = uprv_malloc(sizeof(char) * flagBufferSize);
if (buffer == NULL || tmpFlagBuffer == NULL) {
*status = U_MEMORY_ALLOCATION_ERROR;
goto parseFlagsFile_cleanup;
}
do {
if (allocateMoreSpace) {
allocateMoreSpace = FALSE;
currentBufferSize *= 2;
uprv_free(buffer);
buffer = uprv_malloc(sizeof(char) * currentBufferSize);
if (buffer == NULL) {
*status = U_MEMORY_ALLOCATION_ERROR;
goto parseFlagsFile_cleanup;
}
}
for (i = 0; i < numOfFlags;) {
if (T_FileStream_readLine(f, buffer, currentBufferSize) == NULL) {
/* End of file reached. */
break;
}
if (buffer[0] == '#') {
continue;
}
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 {
idx = extractFlag(buffer, currentBufferSize, tmpFlagBuffer, flagBufferSize, flagNames, numOfFlags, status);
if (U_FAILURE(*status)) {
if (*status == U_BUFFER_OVERFLOW_ERROR) {
result = currentBufferSize;
} else {
result = -1;
}
break;
} else {
if (flagNames != NULL) {
if (idx >= 0) {
uprv_strcpy(flagBuffer[idx], tmpFlagBuffer);
} else {
/* No match found. Skip it. */
continue;
}
} else {
uprv_strcpy(flagBuffer[i++], tmpFlagBuffer);
}
}
}
}
} while (allocateMoreSpace && U_SUCCESS(*status));
parseFlagsFile_cleanup:
uprv_free(tmpFlagBuffer);
uprv_free(buffer);
T_FileStream_close(f);
if (U_FAILURE(*status) && *status != U_BUFFER_OVERFLOW_ERROR) {
return -1;
}
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 int32_t extractFlag(char* buffer, int32_t bufferSize, char* flag, int32_t flagSize, const char **flagNames, int32_t numOfFlags, UErrorCode *status) {
int32_t i, idx = -1;
char *pBuffer;
int32_t offset=0;
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 -1;
}
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;
}
if (flagNames != NULL && offset>0) {
offset--; /* Move offset back 1 because of '='*/
for (i = 0; i < numOfFlags; i++) {
if (uprv_strncmp(buffer, flagNames[i], offset) == 0) {
idx = i;
break;
}
}
}
return idx;
}
/*
* 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;
}
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