conn_init/wfc_util_fctrl.c - device/lge/mako - Git at Google

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <errno.h>
 #include <sys/stat.h>
 #include <sys/types.h>

 #include "wfc_util_log.h"

 /*
 static void wfc_util_printf(char *pSPointer, int length)
 {
 	char *pPrintBuff = NULL;

 	if( NULL == pSPointer || 0 >= length ) {
 		wfc_util_log_error("wfc_util_printf : unvalid parameters");
 		return;
 	}

 	wfc_util_log_error("wfc_util_printf : lenght is (%d)", length);
 	pPrintBuff = malloc(length+1);

 	if( NULL != pPrintBuff ) {
 		memset( pPrintBuff, 0, (length+1) );
 		memcpy(pPrintBuff, pSPointer, length);

 		wfc_util_log_error("wfc_util_printf : %s", pPrintBuff);

 		free(pPrintBuff);
 	} else {
 		wfc_util_log_error("wfc_util_printf : can not malloc(%d)", (length+1));
 	}
 	return;
 }
 */

 static void wfc_util_finsert_new_string(int fd, char **ppReadedBuff, char *pNewStringValue, char *pEndOfCfg)
 {
 	off_t sz_file;
 	int   sz_backupBuff = 0;
 	char *pReadBuff = NULL, *pBackupBuff = NULL;
 	char *pSPointer = NULL, *pETagPointer = NULL;

 	if( 0 == fd || NULL == pNewStringValue || 0 == strlen(pNewStringValue) ) {
 		wfc_util_log_error("wfc_util_finsert_new_string : unvalid parameters");
 		return;
 	}

 	if( NULL == ppReadedBuff) {
 		// TODO:
 		return;
 	} else {
 		pReadBuff = *ppReadedBuff;
 	}

 	/*
 	 * find END TAG string
 	 */
 	pETagPointer = strstr(pReadBuff, pEndOfCfg);
 	pSPointer = pETagPointer - 1;

 	/*
 	 * calcurate file size and size of the tail of file
 	 */
 	sz_file = lseek( fd,  0, SEEK_END );
 	sz_backupBuff = (int)sz_file - (pETagPointer - pReadBuff);

 	/*
 	 * prefare the buffer to store the tail of file
 	 */
 	pBackupBuff = malloc(sz_backupBuff);

 	if( NULL != pBackupBuff ) {
 		/*
 		 * copy the tail of file.
 		 */
 		memset( pBackupBuff, 0, sz_backupBuff );
 		memcpy( pBackupBuff, pETagPointer, sz_backupBuff );

 		/*
 		 * write new string.
 		 */
 		lseek( fd, (int)(pSPointer-pReadBuff), SEEK_SET );
 		write( fd, pNewStringValue, strlen(pNewStringValue));

 		/*
 		 * update pETagPointer.
 		 */
 		pETagPointer = pSPointer + strlen(pNewStringValue);

 		/*
 		 * write the tail of file.
 		 */
 		lseek( fd, (int)(pETagPointer-pReadBuff), SEEK_SET );
 		write( fd, pBackupBuff, sz_backupBuff );

 		ftruncate(fd, sz_file + strlen(pNewStringValue) - 1); /* we use "-1" becasue of "pSPointer = pETagPointer - 1"*/

 		free(pBackupBuff);

 		/*
 		 * make new *ppReadedBuff
 		 */
 		if( NULL != ppReadedBuff) {
 			// TODO:
 		}
 	} else {
 		wfc_util_log_error("wfc_util_finsert_new_string : can not malloc(%d)", sz_backupBuff);
 	}

 	return;
 }

 static void wfc_util_fupdate_string(int fd, char **ppReadedBuff,
                                     char *pETagPointer, char *pSValuePointer, char *pNewValueString)
 {
 	off_t sz_file;
 	int   sz_newReadBuff = 0;
 	char *pReadBuff = NULL, *pNewReadBuff = NULL, *pCurReadBuff = NULL;

 	if( 0 == fd ) {
 		wfc_util_log_error("wfc_util_fupdate_string : unvalid parameters");
 		return;
 	}

 	if( NULL == ppReadedBuff) {
 		// TODO:
 		return;
 	} else {
 		pReadBuff = *ppReadedBuff;
 	}

 	/*
 	 * calcurate file size and new file size
 	 */
 	sz_file  = lseek( fd,  0, SEEK_END );
 	sz_newReadBuff = (int)sz_file - (int)(pETagPointer - pSValuePointer) + strlen(pNewValueString);

 	/*
 	 * prefare the buffer to read file
 	 */
 	pNewReadBuff = malloc(sz_newReadBuff);

 	if( NULL != pNewReadBuff ) {
 		/*
 		 * copy buffer
 		 */
 		memset( pNewReadBuff, 0, sz_file );
 		pCurReadBuff = pNewReadBuff;
 		memcpy( pNewReadBuff, pReadBuff, (int)(pSValuePointer-pReadBuff) );
 		pCurReadBuff += (int)(pSValuePointer-pReadBuff);

 		/*
 		 * copy new value string
 		 */
 		memcpy( pCurReadBuff, pNewValueString, strlen(pNewValueString));
 		pCurReadBuff += strlen(pNewValueString);

 		/*
 		 * copy the remained buffer
 		 */
 		memcpy( pCurReadBuff, pETagPointer, ((int)(sz_file) - (int)(pETagPointer - pReadBuff) + 1));

 		/*
 		 * write file and update the file size
 		 */
 		lseek( fd,  0, SEEK_SET );
 		write( fd, pNewReadBuff, sz_newReadBuff);
 		ftruncate(fd, sz_newReadBuff);

 		free(pNewReadBuff);
 	} else {
 		wfc_util_log_error("wfc_util_fupdate_string : can not malloc(%d)", (int)sz_newReadBuff);
 	}

 	return;
 }

 /*
  * wfc_util_fset_buffer
  *
  * return : void
  */
 void wfc_util_fset_buffer(char *pFileName, int positionStart, unsigned char *pNewValue, int newValueLength)
 {
 	int fd;
 	off_t sz_file;
 	char *pReadBuff = NULL;

 	fd = open( pFileName, O_RDWR );

 	if( fd >= 0 ) {
 		/*
 		 * calcurate file size
 		 */
 		sz_file  = lseek( fd,  0, SEEK_END );

 		/*
 		 * prefare the buffer to read file
 		 */
 		pReadBuff = malloc(sz_file + 1);  // null terminated

 		if( NULL != pReadBuff ) {
 			/*
 			 * read file
 			 */
 			memset( pReadBuff, 0, sz_file + 1);
 			lseek( fd,  0, SEEK_SET );
 			read( fd, pReadBuff, sz_file );

 			if(sz_file >= (positionStart+newValueLength)) {
 				lseek( fd, positionStart, SEEK_SET );
 				write( fd, pNewValue, newValueLength );
 			} else {
 				/*
 				 * insert with new length value buffer
 				 */
 				wfc_util_log_error("wfc_util_fset_buffer : file size(%d) is less than to write position(%d)", (int)sz_file, (positionStart+newValueLength));
 				// TODO:
 			}

 			free(pReadBuff);
 		} else {
 			wfc_util_log_error("wfc_util_fset_buffer : can not malloc(%d)", (int)sz_file);
 		}

 		if ( -1 == fsync( fd ) ) {
 			wfc_util_log_error("wfc_util_fset_buffer : fail to fsync()");
 		}

 		close( fd );
 	} else {
 		wfc_util_log_error("wfc_util_fset_buffer : can not open file");
 	}

 	return;
 }

 /*
  * wfc_util_fget_buffer
  *
  * return : it will return the length of the stored buffer value if procedure is success
  *          or will return 0 if not.
  */
 int wfc_util_fget_buffer(char *pFileName, int positionStart, int lengthToRead, unsigned char *pValueBuff, int buffLength)
 {
 	int result = 0;
 	int fd;
 	off_t sz_file;
 	char *pReadBuff = NULL;
 	char *pSValuePointer = NULL, *pETagPointer = NULL;

 	fd = open( pFileName, O_RDONLY );

 	if( fd >= 0 ) {
 		/*
 		 * calcurate file size
 		 */
 		sz_file  = lseek( fd,  0, SEEK_END );

 		if(sz_file >= (positionStart+lengthToRead)) {
 			/*
 			 * prefare the buffer to read file
 			 */
 			pReadBuff = malloc(sz_file + 1); // null terminated

 			if( NULL != pReadBuff ) {
 				/*
 				 * read file
 				 */
 				memset( pReadBuff, 0, sz_file + 1 );
 				lseek( fd,  0, SEEK_SET );
 				read( fd, pReadBuff, sz_file );

 				/*
 				 * calculate the start buffer pointer
 				 */
 				pSValuePointer = pReadBuff + positionStart;

 				/*
 				 * calculate the end buffer pointer
 				 */
 				pETagPointer = pSValuePointer + lengthToRead;

 				/*
 				 * read the string value
 				 */
 				if( buffLength >= (int)(pETagPointer-pSValuePointer) ) {
 					memset( pValueBuff, 0, buffLength );
 					memcpy( pValueBuff, pSValuePointer, (int)(pETagPointer-pSValuePointer) );
 					result = (int)(pETagPointer-pSValuePointer);
 				} else {
 					wfc_util_log_error("wfc_util_fget_buffer : not enough string value buffer(%d)", (int)(pETagPointer-pSValuePointer));
 				}

 				free(pReadBuff);
 			} else {
 				wfc_util_log_error("wfc_util_fget_buffer : can not malloc(%d)", (int)sz_file);
 			}
 		} else {
 			wfc_util_log_error("wfc_util_fget_buffer : file size(%d) is less than to read position(%d)", (int)sz_file, (positionStart+lengthToRead));
 		}
 		close( fd );
 	} else {
 		wfc_util_log_error("wfc_util_fget_buffer : can not open file");
 	}

 	return result;
 }

 /*
  * wfc_util_fset_string
  *
  * The following format string will be added or updated to the file pFileName.
  * [pSTagString][pNewValueString][pETagString]
  *
  * pFileName       : file name and path
  * pEndOfCfg       : tag string to notify the end of configuration file
  * pSTagString     : tag string to notify purpose of the value
  * pETagString     : tag string to notify the end of the value
  * pNewValueString : string to set for pSTagString
  *
  * return : void
  */
 void wfc_util_fset_string(char *pFileName, char *pEndOfCfg, char *pSTagString, char *pETagString, char *pNewValueString)
 {
 	int fd;
 	off_t sz_file;
 	int   sz_NewValueBuff = 0;
 	char *pReadBuff = NULL, *pNewValueBuff = NULL;
 	char *pSPointer = NULL, *pETagPointer = NULL, *pSValuePointer = NULL;

 	fd = open( pFileName, O_RDWR );

 	if( fd >= 0 ) {
 		/*
 		 * calcurate file size
 		 */
 		sz_file  = lseek( fd,  0, SEEK_END );

 		/*
 		 * prefare the buffer to read file
 		 */
 		if (sz_file > 0)
 			pReadBuff = malloc(sz_file + 1); // null terminated

 		if( NULL != pReadBuff ) {
 			/*
 			 * read file
 			 */
 			memset( pReadBuff, 0x00, sz_file + 1);
 			if(lseek(fd, 0, SEEK_SET) != 0) {
 				wfc_util_log_error("lseek failure");
 			}
 			read( fd, pReadBuff, sz_file );

 			/* WBT fix, make sure it is terminated with \0 */
 			pReadBuff[sz_file] = '\0';

 			/*
 			 * find TAG string
 			 */
 			pSPointer = strstr(pReadBuff, pSTagString);

 			if(NULL != pSPointer) {
 				/*
 				 * find END OF LINE string
 				 */
 				pETagPointer = strstr(pSPointer, pETagString);

 				if(NULL != pETagPointer) {
 					/*
 					 * write the new string value
 					 */
 					pSValuePointer = pSPointer+strlen(pSTagString);
 					if(strlen(pNewValueString) == (unsigned int)(pETagPointer-pSValuePointer)) {
 						lseek( fd, (int)(pSValuePointer-pReadBuff), SEEK_SET );
 						write( fd, pNewValueString, strlen(pNewValueString));
 					} else {
 						/*
 						 * insert with new length value string
 						 */
 						wfc_util_fupdate_string(fd, &pReadBuff, pETagPointer, pSValuePointer, pNewValueString);
 					}
 				} else {
 					wfc_util_log_error("wfc_util_fset_string : can not find End TAG");
 				}
 			} else {
 				/*
 				 * "\n""[Start TAG][String Value][End TAG]""\n"
 				 */
 				sz_NewValueBuff = strlen(pSTagString) +
 				                  strlen(pNewValueString) +
 				                  strlen(pETagString) +
 				                  2 + 1;
 				pNewValueBuff = malloc( sz_NewValueBuff);

 				if( NULL != pNewValueBuff ) {
 					/*
 					 * prefare the new string to insert
 					 */
 					memset( pNewValueBuff, 0, sz_NewValueBuff );
 					sprintf( pNewValueBuff, "%c%s%s%s%c", '\n', pSTagString, pNewValueString, pETagString,'\n' );

 					/*
 					 * insert new string to the file
 					 */
 					wfc_util_finsert_new_string(fd, &pReadBuff, pNewValueBuff, pEndOfCfg);

 					free( pNewValueBuff );
 				} else {
 					wfc_util_log_error("wfc_util_fset_string : can not malloc(%d)", (int)sz_file);
 				}
 			}

 			free(pReadBuff);
 		} else {
 			wfc_util_log_error("wfc_util_fset_string : can not malloc(%d)", (int)sz_file);
 		}

 		if ( -1 == fsync( fd ) ) {
 			wfc_util_log_error("wfc_util_fset_string : fail to fsync()");
 		}

 		close( fd );
 	} else {
 		wfc_util_log_error("wfc_util_fset_string : can not open file");
 	}

 	return;
 }

 /*
  * wfc_util_fget_string
  *
  * Read value from the following format string in the file pFileName.
  * [pSTagString][string value to read][pETagString]
  *
  * pFileName        : file name and path
  * pEndOfCfg        : tag string to notify the end of configuration file
  * pSTagString      : tag string to notify purpose of the value
  * pETagString      : tag string to notify the end of the value
  * pValueStringBuff : string buffer to get string value
  * stringBuffLength : the length of pValueStringBuff
  *
  * return : it will return the length of the stored string value if procedure is success
  *          or will return 0 if not.
  */
 int wfc_util_fget_string(char *pFileName, char *pEndOfCfg, char *pSTagString, char *pETagString, char *pValueStringBuff, int stringBuffLength)
 {
 	int result = 0;
 	int fd;
 	off_t sz_file;
 	char *pReadBuff = NULL;
 	char *pSPointer = NULL, *pETagPointer = NULL, *pSValuePointer = NULL;

 	/* unused parameter*/
 	pEndOfCfg = pEndOfCfg;

 	fd = open( pFileName, O_RDONLY );

 	if( fd >= 0 ) {
 		/*
 		 * calcurate file size
 		 */
 		sz_file  = lseek( fd,  0, SEEK_END );

 		/*
 		 * prefare the buffer to read file
 		 */
 		if (sz_file > 0)		// skip when value is 0
 			pReadBuff = malloc(sz_file + 1);

 		if( NULL != pReadBuff ) {
 			/*
 			 * read file
 			 */
 			memset( pReadBuff, 0, sz_file + 1);
 			if(lseek(fd, 0, SEEK_SET) != 0) {
 				wfc_util_log_error("lseek failure");
 			}
 			read( fd, pReadBuff, sz_file );

 			/* WBT fix, make sure it is terminated with \0 */
 			pReadBuff[sz_file] = '\0';

 			/*
 			 * find TAG string
 			 */
 			pSPointer = strstr( pReadBuff, pSTagString );

 			if( NULL != pSPointer ) {
 				/*
 				 * find END OF LINE string
 				 */
 				pETagPointer = strstr(pSPointer, pETagString);

 				if( NULL != pETagPointer ) {
 					/*
 					 * read the string value
 					 */
 					pSValuePointer = pSPointer+strlen(pSTagString);
 					if( stringBuffLength >= (int)(pETagPointer-pSValuePointer) ) {
 						memset( pValueStringBuff, 0, stringBuffLength );
 						memcpy( pValueStringBuff, pSValuePointer, (int)(pETagPointer-pSValuePointer) );
 						result = (int)(pETagPointer-pSValuePointer);
 					} else {
 						wfc_util_log_error("wfc_util_fget_string : not enough string value buffer(%d)", (int)(pETagPointer-pSValuePointer));
 					}
 				} else {
 					wfc_util_log_error("wfc_util_fget_string : can not find End TAG");
 				}
 			} else {
 				wfc_util_log_error("wfc_util_fget_string : can not find Start TAG");
 			}
 			free(pReadBuff);
 		} else {
 			wfc_util_log_error("wfc_util_fget_string : can not malloc(%d)", (int)sz_file);
 		}
 		close( fd );
 	} else {
 		wfc_util_log_error("wfc_util_fget_string : can not open file");
 	}

 	return result;
 }

 /*
  * wfc_util_ffile_check
  *
  * check whether pDestFName file exist or not
  *
  * pFileName   : file name and path
  * access_mode : R_OK | W_OK | X_OK | F_OK
  *
  * return : it will return 0 if the file exist
  *          or will return -1 if not.
  */
 int wfc_util_ffile_check(char *pDestFName, int access_mode)
 {
 	struct stat st;

 	if (access(pDestFName, access_mode) == 0) {
 		if( stat( pDestFName, &st ) < 0 ) {
 			wfc_util_log_error("Cannot stat the file \"%s\": %s", pDestFName, strerror(errno));
 			return -1;
 		}
 		//check if config file has some data or is it empty due to previous errors
 		if( st.st_size ) {
 			return 0;
 		}
 	} else {
 		wfc_util_log_error("Cannot access \"%s\": %s", pDestFName, strerror(errno));
 	}

 	return -1;
 }

 /*
  * wfc_util_ffile_check_copy
  *
  * check whether pDestFName file exist if not it will copy from pSourceFName file
  *
  * return : it will return 0 if procedure is success
  *          or will return -1 if not.
  */
 int wfc_util_ffile_check_copy(char *pDestFName, char *pSourceFName, mode_t mode, uid_t uID, gid_t gID)
 {
 #define WFC_BUFFER_SIZE 2048
 	char buf[WFC_BUFFER_SIZE] = {0}; // Null terminated
 	int srcfd, destfd;
 	int nread;
 	struct stat st;

 	if (access(pDestFName, R_OK|W_OK) == 0) {
 		if( stat( pDestFName, &st ) < 0 ) {
 			wfc_util_log_error("Cannot stat the file \"%s\": %s", pDestFName, strerror(errno));
 			return -1;
 		}
 		//check if config file has some data or is it empty due to previous errors
 		if( st.st_size ) {
 			return 0;
 		}
 	//else continue to write the config from default template.
 	} else if (errno != ENOENT) {
 		wfc_util_log_error("Cannot access \"%s\": %s", pDestFName, strerror(errno));
 		return -1;
 	}

 	srcfd = open(pSourceFName, O_RDONLY);
 	if (srcfd < 0) {
 		wfc_util_log_error("Cannot open \"%s\": %s", pSourceFName, strerror(errno));
 		return -1;
 	}

 	destfd = open(pDestFName, O_CREAT|O_WRONLY, mode);
 	if (destfd < 0) {
 		close(srcfd);
 		wfc_util_log_error("Cannot create \"%s\": %s", pDestFName, strerror(errno));
 		return -1;
 	}

 	while ((nread = read(srcfd, buf, WFC_BUFFER_SIZE-1)) != 0) {
 		if (nread < 0) {
 			wfc_util_log_error("Error reading \"%s\": %s", pSourceFName, strerror(errno));
 			close(srcfd);
 			close(destfd);
 			unlink(pDestFName);
 			return -1;
 		}
 		// WBT fix, according to manual, the number of bytes read can't be bigger than read_size. I don't know why WBT complains for this.
 		if (nread < WFC_BUFFER_SIZE)
 			buf[nread] = '\0';
 		else {
 			buf[WFC_BUFFER_SIZE-1] = '\0';
 			nread = WFC_BUFFER_SIZE-1;
 		}
 		write(destfd, buf, nread);
 	}

 	close(destfd);
 	close(srcfd);

 	/* remove this code because of permission problem when it is accessed from "atd" having system permission. */
 	{
 	#ifndef CONFIG_LGE_WLAN_WIFI_PATCH
 	uid_t uid = getuid();
 	gid_t gid = getgid();
 	wfc_util_log_error("Error changing group ownership (%d) of %s to %d: %s", gid, pDestFName, gID, strerror(errno));
 	if (0 == uid) {
 	#endif /* CONFIG_LGE_WLAN_WIFI_PATCH */
 		if (chown(pDestFName, uID, gID) < 0) {
 			wfc_util_log_error("Error changing group ownership of %s to %d: %s", pDestFName, gID, strerror(errno));
 			unlink(pDestFName);
 			return -1;
 		}
 	#ifndef CONFIG_LGE_WLAN_WIFI_PATCH
 	} else {
 		wfc_util_log_error("wfc_util_ffile_check_copy : we can not excute chown[uid = %d, gid = %d]", uid, getgid());
 	}
 	#endif /* CONFIG_LGE_WLAN_WIFI_PATCH */
 	}

 	return 0;
 }
	/*
	* Copyright 2012 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <fcntl.h>
	#include <unistd.h>
	#include <errno.h>
	#include <sys/stat.h>
	#include <sys/types.h>

	#include "wfc_util_log.h"

	/*
	static void wfc_util_printf(char *pSPointer, int length)
	{
	char *pPrintBuff = NULL;

	if( NULL == pSPointer \|\| 0 >= length ) {
	wfc_util_log_error("wfc_util_printf : unvalid parameters");
	return;
	}

	wfc_util_log_error("wfc_util_printf : lenght is (%d)", length);
	pPrintBuff = malloc(length+1);

	if( NULL != pPrintBuff ) {
	memset( pPrintBuff, 0, (length+1) );
	memcpy(pPrintBuff, pSPointer, length);

	wfc_util_log_error("wfc_util_printf : %s", pPrintBuff);

	free(pPrintBuff);
	} else {
	wfc_util_log_error("wfc_util_printf : can not malloc(%d)", (length+1));
	}
	return;
	}
	*/

	static void wfc_util_finsert_new_string(int fd, char *ppReadedBuff, char pNewStringValue, char *pEndOfCfg)
	{
	off_t sz_file;
	int sz_backupBuff = 0;
	char pReadBuff = NULL, pBackupBuff = NULL;
	char pSPointer = NULL, pETagPointer = NULL;

	if( 0 == fd \|\| NULL == pNewStringValue \|\| 0 == strlen(pNewStringValue) ) {
	wfc_util_log_error("wfc_util_finsert_new_string : unvalid parameters");
	return;
	}

	if( NULL == ppReadedBuff) {
	// TODO:
	return;
	} else {
	pReadBuff = *ppReadedBuff;
	}

	/*
	* find END TAG string
	*/
	pETagPointer = strstr(pReadBuff, pEndOfCfg);
	pSPointer = pETagPointer - 1;

	/*
	* calcurate file size and size of the tail of file
	*/
	sz_file = lseek( fd, 0, SEEK_END );
	sz_backupBuff = (int)sz_file - (pETagPointer - pReadBuff);

	/*
	* prefare the buffer to store the tail of file
	*/
	pBackupBuff = malloc(sz_backupBuff);

	if( NULL != pBackupBuff ) {
	/*
	* copy the tail of file.
	*/
	memset( pBackupBuff, 0, sz_backupBuff );
	memcpy( pBackupBuff, pETagPointer, sz_backupBuff );

	/*
	* write new string.
	*/
	lseek( fd, (int)(pSPointer-pReadBuff), SEEK_SET );
	write( fd, pNewStringValue, strlen(pNewStringValue));

	/*
	* update pETagPointer.
	*/
	pETagPointer = pSPointer + strlen(pNewStringValue);

	/*
	* write the tail of file.
	*/
	lseek( fd, (int)(pETagPointer-pReadBuff), SEEK_SET );
	write( fd, pBackupBuff, sz_backupBuff );

	ftruncate(fd, sz_file + strlen(pNewStringValue) - 1); /* we use "-1" becasue of "pSPointer = pETagPointer - 1"*/

	free(pBackupBuff);

	/*
	* make new *ppReadedBuff
	*/
	if( NULL != ppReadedBuff) {
	// TODO:
	}
	} else {
	wfc_util_log_error("wfc_util_finsert_new_string : can not malloc(%d)", sz_backupBuff);
	}

	return;
	}

	static void wfc_util_fupdate_string(int fd, char **ppReadedBuff,
	char pETagPointer, char pSValuePointer, char *pNewValueString)
	{
	off_t sz_file;
	int sz_newReadBuff = 0;
	char pReadBuff = NULL, pNewReadBuff = NULL, *pCurReadBuff = NULL;

	if( 0 == fd ) {
	wfc_util_log_error("wfc_util_fupdate_string : unvalid parameters");
	return;
	}

	if( NULL == ppReadedBuff) {
	// TODO:
	return;
	} else {
	pReadBuff = *ppReadedBuff;
	}

	/*
	* calcurate file size and new file size
	*/
	sz_file = lseek( fd, 0, SEEK_END );
	sz_newReadBuff = (int)sz_file - (int)(pETagPointer - pSValuePointer) + strlen(pNewValueString);

	/*
	* prefare the buffer to read file
	*/
	pNewReadBuff = malloc(sz_newReadBuff);

	if( NULL != pNewReadBuff ) {
	/*
	* copy buffer
	*/
	memset( pNewReadBuff, 0, sz_file );
	pCurReadBuff = pNewReadBuff;
	memcpy( pNewReadBuff, pReadBuff, (int)(pSValuePointer-pReadBuff) );
	pCurReadBuff += (int)(pSValuePointer-pReadBuff);

	/*
	* copy new value string
	*/
	memcpy( pCurReadBuff, pNewValueString, strlen(pNewValueString));
	pCurReadBuff += strlen(pNewValueString);

	/*
	* copy the remained buffer
	*/
	memcpy( pCurReadBuff, pETagPointer, ((int)(sz_file) - (int)(pETagPointer - pReadBuff) + 1));

	/*
	* write file and update the file size
	*/
	lseek( fd, 0, SEEK_SET );
	write( fd, pNewReadBuff, sz_newReadBuff);
	ftruncate(fd, sz_newReadBuff);

	free(pNewReadBuff);
	} else {
	wfc_util_log_error("wfc_util_fupdate_string : can not malloc(%d)", (int)sz_newReadBuff);
	}

	return;
	}

	/*
	* wfc_util_fset_buffer
	*
	* return : void
	*/
	void wfc_util_fset_buffer(char pFileName, int positionStart, unsigned char pNewValue, int newValueLength)
	{
	int fd;
	off_t sz_file;
	char *pReadBuff = NULL;

	fd = open( pFileName, O_RDWR );

	if( fd >= 0 ) {
	/*
	* calcurate file size
	*/
	sz_file = lseek( fd, 0, SEEK_END );

	/*
	* prefare the buffer to read file
	*/
	pReadBuff = malloc(sz_file + 1); // null terminated

	if( NULL != pReadBuff ) {
	/*
	* read file
	*/
	memset( pReadBuff, 0, sz_file + 1);
	lseek( fd, 0, SEEK_SET );
	read( fd, pReadBuff, sz_file );

	if(sz_file >= (positionStart+newValueLength)) {
	lseek( fd, positionStart, SEEK_SET );
	write( fd, pNewValue, newValueLength );
	} else {
	/*
	* insert with new length value buffer
	*/
	wfc_util_log_error("wfc_util_fset_buffer : file size(%d) is less than to write position(%d)", (int)sz_file, (positionStart+newValueLength));
	// TODO:
	}

	free(pReadBuff);
	} else {
	wfc_util_log_error("wfc_util_fset_buffer : can not malloc(%d)", (int)sz_file);
	}

	if ( -1 == fsync( fd ) ) {
	wfc_util_log_error("wfc_util_fset_buffer : fail to fsync()");
	}

	close( fd );
	} else {
	wfc_util_log_error("wfc_util_fset_buffer : can not open file");
	}

	return;
	}

	/*
	* wfc_util_fget_buffer
	*
	* return : it will return the length of the stored buffer value if procedure is success
	* or will return 0 if not.
	*/
	int wfc_util_fget_buffer(char pFileName, int positionStart, int lengthToRead, unsigned char pValueBuff, int buffLength)
	{
	int result = 0;
	int fd;
	off_t sz_file;
	char *pReadBuff = NULL;
	char pSValuePointer = NULL, pETagPointer = NULL;

	fd = open( pFileName, O_RDONLY );

	if( fd >= 0 ) {
	/*
	* calcurate file size
	*/
	sz_file = lseek( fd, 0, SEEK_END );

	if(sz_file >= (positionStart+lengthToRead)) {
	/*
	* prefare the buffer to read file
	*/
	pReadBuff = malloc(sz_file + 1); // null terminated

	if( NULL != pReadBuff ) {
	/*
	* read file
	*/
	memset( pReadBuff, 0, sz_file + 1 );
	lseek( fd, 0, SEEK_SET );
	read( fd, pReadBuff, sz_file );

	/*
	* calculate the start buffer pointer
	*/
	pSValuePointer = pReadBuff + positionStart;

	/*
	* calculate the end buffer pointer
	*/
	pETagPointer = pSValuePointer + lengthToRead;

	/*
	* read the string value
	*/
	if( buffLength >= (int)(pETagPointer-pSValuePointer) ) {
	memset( pValueBuff, 0, buffLength );
	memcpy( pValueBuff, pSValuePointer, (int)(pETagPointer-pSValuePointer) );
	result = (int)(pETagPointer-pSValuePointer);
	} else {
	wfc_util_log_error("wfc_util_fget_buffer : not enough string value buffer(%d)", (int)(pETagPointer-pSValuePointer));
	}

	free(pReadBuff);
	} else {
	wfc_util_log_error("wfc_util_fget_buffer : can not malloc(%d)", (int)sz_file);
	}
	} else {
	wfc_util_log_error("wfc_util_fget_buffer : file size(%d) is less than to read position(%d)", (int)sz_file, (positionStart+lengthToRead));
	}
	close( fd );
	} else {
	wfc_util_log_error("wfc_util_fget_buffer : can not open file");
	}

	return result;
	}

	/*
	* wfc_util_fset_string
	*
	* The following format string will be added or updated to the file pFileName.
	* [pSTagString][pNewValueString][pETagString]
	*
	* pFileName : file name and path
	* pEndOfCfg : tag string to notify the end of configuration file
	* pSTagString : tag string to notify purpose of the value
	* pETagString : tag string to notify the end of the value
	* pNewValueString : string to set for pSTagString
	*
	* return : void
	*/
	void wfc_util_fset_string(char pFileName, char pEndOfCfg, char pSTagString, char pETagString, char *pNewValueString)
	{
	int fd;
	off_t sz_file;
	int sz_NewValueBuff = 0;
	char pReadBuff = NULL, pNewValueBuff = NULL;
	char pSPointer = NULL, pETagPointer = NULL, *pSValuePointer = NULL;

	fd = open( pFileName, O_RDWR );

	if( fd >= 0 ) {
	/*
	* calcurate file size
	*/
	sz_file = lseek( fd, 0, SEEK_END );

	/*
	* prefare the buffer to read file
	*/
	if (sz_file > 0)
	pReadBuff = malloc(sz_file + 1); // null terminated

	if( NULL != pReadBuff ) {
	/*
	* read file
	*/
	memset( pReadBuff, 0x00, sz_file + 1);
	if(lseek(fd, 0, SEEK_SET) != 0) {
	wfc_util_log_error("lseek failure");
	}
	read( fd, pReadBuff, sz_file );

	/* WBT fix, make sure it is terminated with \0 */
	pReadBuff[sz_file] = '\0';

	/*
	* find TAG string
	*/
	pSPointer = strstr(pReadBuff, pSTagString);

	if(NULL != pSPointer) {
	/*
	* find END OF LINE string
	*/
	pETagPointer = strstr(pSPointer, pETagString);

	if(NULL != pETagPointer) {
	/*
	* write the new string value
	*/
	pSValuePointer = pSPointer+strlen(pSTagString);
	if(strlen(pNewValueString) == (unsigned int)(pETagPointer-pSValuePointer)) {
	lseek( fd, (int)(pSValuePointer-pReadBuff), SEEK_SET );
	write( fd, pNewValueString, strlen(pNewValueString));
	} else {
	/*
	* insert with new length value string
	*/
	wfc_util_fupdate_string(fd, &pReadBuff, pETagPointer, pSValuePointer, pNewValueString);
	}
	} else {
	wfc_util_log_error("wfc_util_fset_string : can not find End TAG");
	}
	} else {
	/*
	* "\n""[Start TAG][String Value][End TAG]""\n"
	*/
	sz_NewValueBuff = strlen(pSTagString) +
	strlen(pNewValueString) +
	strlen(pETagString) +
	2 + 1;
	pNewValueBuff = malloc( sz_NewValueBuff);

	if( NULL != pNewValueBuff ) {
	/*
	* prefare the new string to insert
	*/
	memset( pNewValueBuff, 0, sz_NewValueBuff );
	sprintf( pNewValueBuff, "%c%s%s%s%c", '\n', pSTagString, pNewValueString, pETagString,'\n' );

	/*
	* insert new string to the file
	*/
	wfc_util_finsert_new_string(fd, &pReadBuff, pNewValueBuff, pEndOfCfg);

	free( pNewValueBuff );
	} else {
	wfc_util_log_error("wfc_util_fset_string : can not malloc(%d)", (int)sz_file);
	}
	}

	free(pReadBuff);
	} else {
	wfc_util_log_error("wfc_util_fset_string : can not malloc(%d)", (int)sz_file);
	}

	if ( -1 == fsync( fd ) ) {
	wfc_util_log_error("wfc_util_fset_string : fail to fsync()");
	}

	close( fd );
	} else {
	wfc_util_log_error("wfc_util_fset_string : can not open file");
	}

	return;
	}

	/*
	* wfc_util_fget_string
	*
	* Read value from the following format string in the file pFileName.
	* [pSTagString][string value to read][pETagString]
	*
	* pFileName : file name and path
	* pEndOfCfg : tag string to notify the end of configuration file
	* pSTagString : tag string to notify purpose of the value
	* pETagString : tag string to notify the end of the value
	* pValueStringBuff : string buffer to get string value
	* stringBuffLength : the length of pValueStringBuff
	*
	* return : it will return the length of the stored string value if procedure is success
	* or will return 0 if not.
	*/
	int wfc_util_fget_string(char pFileName, char pEndOfCfg, char pSTagString, char pETagString, char *pValueStringBuff, int stringBuffLength)
	{
	int result = 0;
	int fd;
	off_t sz_file;
	char *pReadBuff = NULL;
	char pSPointer = NULL, pETagPointer = NULL, *pSValuePointer = NULL;

	/* unused parameter*/
	pEndOfCfg = pEndOfCfg;

	fd = open( pFileName, O_RDONLY );

	if( fd >= 0 ) {
	/*
	* calcurate file size
	*/
	sz_file = lseek( fd, 0, SEEK_END );

	/*
	* prefare the buffer to read file
	*/
	if (sz_file > 0) // skip when value is 0
	pReadBuff = malloc(sz_file + 1);

	if( NULL != pReadBuff ) {
	/*
	* read file
	*/
	memset( pReadBuff, 0, sz_file + 1);
	if(lseek(fd, 0, SEEK_SET) != 0) {
	wfc_util_log_error("lseek failure");
	}
	read( fd, pReadBuff, sz_file );

	/* WBT fix, make sure it is terminated with \0 */
	pReadBuff[sz_file] = '\0';

	/*
	* find TAG string
	*/
	pSPointer = strstr( pReadBuff, pSTagString );

	if( NULL != pSPointer ) {
	/*
	* find END OF LINE string
	*/
	pETagPointer = strstr(pSPointer, pETagString);

	if( NULL != pETagPointer ) {
	/*
	* read the string value
	*/
	pSValuePointer = pSPointer+strlen(pSTagString);
	if( stringBuffLength >= (int)(pETagPointer-pSValuePointer) ) {
	memset( pValueStringBuff, 0, stringBuffLength );
	memcpy( pValueStringBuff, pSValuePointer, (int)(pETagPointer-pSValuePointer) );
	result = (int)(pETagPointer-pSValuePointer);
	} else {
	wfc_util_log_error("wfc_util_fget_string : not enough string value buffer(%d)", (int)(pETagPointer-pSValuePointer));
	}
	} else {
	wfc_util_log_error("wfc_util_fget_string : can not find End TAG");
	}
	} else {
	wfc_util_log_error("wfc_util_fget_string : can not find Start TAG");
	}
	free(pReadBuff);
	} else {
	wfc_util_log_error("wfc_util_fget_string : can not malloc(%d)", (int)sz_file);
	}
	close( fd );
	} else {
	wfc_util_log_error("wfc_util_fget_string : can not open file");
	}

	return result;
	}

	/*
	* wfc_util_ffile_check
	*
	* check whether pDestFName file exist or not
	*
	* pFileName : file name and path
	* access_mode : R_OK \| W_OK \| X_OK \| F_OK
	*
	* return : it will return 0 if the file exist
	* or will return -1 if not.
	*/
	int wfc_util_ffile_check(char *pDestFName, int access_mode)
	{
	struct stat st;

	if (access(pDestFName, access_mode) == 0) {
	if( stat( pDestFName, &st ) < 0 ) {
	wfc_util_log_error("Cannot stat the file \"%s\": %s", pDestFName, strerror(errno));
	return -1;
	}
	//check if config file has some data or is it empty due to previous errors
	if( st.st_size ) {
	return 0;
	}
	} else {
	wfc_util_log_error("Cannot access \"%s\": %s", pDestFName, strerror(errno));
	}

	return -1;
	}

	/*
	* wfc_util_ffile_check_copy
	*
	* check whether pDestFName file exist if not it will copy from pSourceFName file
	*
	* return : it will return 0 if procedure is success
	* or will return -1 if not.
	*/
	int wfc_util_ffile_check_copy(char pDestFName, char pSourceFName, mode_t mode, uid_t uID, gid_t gID)
	{
	#define WFC_BUFFER_SIZE 2048
	char buf[WFC_BUFFER_SIZE] = {0}; // Null terminated
	int srcfd, destfd;
	int nread;
	struct stat st;

	if (access(pDestFName, R_OK\|W_OK) == 0) {
	if( stat( pDestFName, &st ) < 0 ) {
	wfc_util_log_error("Cannot stat the file \"%s\": %s", pDestFName, strerror(errno));
	return -1;
	}
	//check if config file has some data or is it empty due to previous errors
	if( st.st_size ) {
	return 0;
	}
	//else continue to write the config from default template.
	} else if (errno != ENOENT) {
	wfc_util_log_error("Cannot access \"%s\": %s", pDestFName, strerror(errno));
	return -1;
	}

	srcfd = open(pSourceFName, O_RDONLY);
	if (srcfd < 0) {
	wfc_util_log_error("Cannot open \"%s\": %s", pSourceFName, strerror(errno));
	return -1;
	}

	destfd = open(pDestFName, O_CREAT\|O_WRONLY, mode);
	if (destfd < 0) {
	close(srcfd);
	wfc_util_log_error("Cannot create \"%s\": %s", pDestFName, strerror(errno));
	return -1;
	}

	while ((nread = read(srcfd, buf, WFC_BUFFER_SIZE-1)) != 0) {
	if (nread < 0) {
	wfc_util_log_error("Error reading \"%s\": %s", pSourceFName, strerror(errno));
	close(srcfd);
	close(destfd);
	unlink(pDestFName);
	return -1;
	}
	// WBT fix, according to manual, the number of bytes read can't be bigger than read_size. I don't know why WBT complains for this.
	if (nread < WFC_BUFFER_SIZE)
	buf[nread] = '\0';
	else {
	buf[WFC_BUFFER_SIZE-1] = '\0';
	nread = WFC_BUFFER_SIZE-1;
	}
	write(destfd, buf, nread);
	}

	close(destfd);
	close(srcfd);

	/* remove this code because of permission problem when it is accessed from "atd" having system permission. */
	{
	#ifndef CONFIG_LGE_WLAN_WIFI_PATCH
	uid_t uid = getuid();
	gid_t gid = getgid();
	wfc_util_log_error("Error changing group ownership (%d) of %s to %d: %s", gid, pDestFName, gID, strerror(errno));
	if (0 == uid) {
	#endif /* CONFIG_LGE_WLAN_WIFI_PATCH */
	if (chown(pDestFName, uID, gID) < 0) {
	wfc_util_log_error("Error changing group ownership of %s to %d: %s", pDestFName, gID, strerror(errno));
	unlink(pDestFName);
	return -1;
	}
	#ifndef CONFIG_LGE_WLAN_WIFI_PATCH
	} else {
	wfc_util_log_error("wfc_util_ffile_check_copy : we can not excute chown[uid = %d, gid = %d]", uid, getgid());
	}
	#endif /* CONFIG_LGE_WLAN_WIFI_PATCH */
	}

	return 0;
	}