/
ErrorLog.cpp
executable file
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ErrorLog.cpp
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///CHARLES COX'S ERROR LOG AND REPORTING DYNAMIC (C2ELRD) (c)2001 Charles Cox
#include "ErrorLog.h"
#include <time.h>
///////////////////////////////////////////////
// PRIVATE FUNCTIONS
///////////////////////////////////////////////
int ErrorLog::FindSuitableErrorLogFileNumber()
{
FILE* FP;
int Number = 0;
char Name[500];
strcpy(Name, "Err0.log");
while((FP = ::fopen(Name, "r")) != NULL)
{
fclose(FP);
FP = NULL;
Number++;
sprintf(Name, "Err%d.log", Number);
}
if(FP){
::fclose(FP);
}
return Number;
}
bool ErrorLog::OpenErrorLog()
{
FILE * fp;
if((fp = fopen(mErrorFileName, "a+")) == NULL){ //CALL OVERLOADED FOPEN
return false;
}
else{
mFilePointer = fp;
return true;
}
}
void ErrorLog::CloseErrorLog()
{
if(mFilePointer){
fclose(mFilePointer); //CALL OVERLOADED FCLOSE
mFilePointer = NULL;
}
}
FILE* ErrorLog::fopen(const char* filename, const char* attribs)
{
FILE* FP;
if(mFileBeingAccessed){
return NULL;
}
else{
FP = ::fopen(filename, attribs); //CALL STD FOPEN
if(FP){
mFileBeingAccessed = true;
}
return FP;
}
}
void ErrorLog::fclose(FILE* fp)
{
if(fp){
::fclose(fp); //CALL STD FCLOSE.
}
mFileBeingAccessed = false;
}
void ErrorLog::AddInitialErrorLogString()
{
time_t OurTime = time(NULL);
tm* timestruct = localtime(&OurTime); //LOCAL TIME IS REQUIRED.
char InitialString[500];
sprintf(InitialString, "Charles Cox's Error Log and Reporting Dynamic (C2ELRD) (c)2001 Charles Cox - Log #%d", mErrorLogID); //LET US NOT FORGET WHO WROTE THIS THING.
if(!OpenErrorLog()){
return;
}
fputs(InitialString, mFilePointer);
fputc('\n', mFilePointer);
sprintf(InitialString, "Logging Started %d/%d/%d - %2.2d:%2.2d", timestruct->tm_mon + 1, timestruct->tm_mday, 1900 + timestruct->tm_year, timestruct->tm_hour, timestruct->tm_min);
fputs(InitialString, mFilePointer);
fputc('\n', mFilePointer);
sprintf(InitialString, "--------------------------------------------");
fputs(InitialString, mFilePointer);
fputc('\n', mFilePointer);
CloseErrorLog();
}
void ErrorLog::AddFinalErrorLogString()
{
time_t OurTime = time(NULL);
tm* timestruct = localtime(&OurTime); //LOCAL TIME IS REQUIRED.
char InitialString[500];
if(!OpenErrorLog()){
return;
}
sprintf(InitialString, "--------------------------------------------");
fputs(InitialString, mFilePointer);
fputc('\n', mFilePointer);
sprintf(InitialString, "Logging Ended %d/%d/%d - %2.2d:%2.2d", timestruct->tm_mon + 1, timestruct->tm_mday, 1900 + timestruct->tm_year, timestruct->tm_hour, timestruct->tm_min);
fputs(InitialString, mFilePointer);
fputc('\n', mFilePointer);
CloseErrorLog();
}
int ErrorLog::GetNumberIDDigits()
{
if(!mErrorLogID && mNumberOfErrors < 1){
return 1;
}
int CurrentMultiple = 10;
int NumDigitsNeeded = 0;
while(mNumberOfErrors / CurrentMultiple > 0){
CurrentMultiple *= CurrentMultiple;
NumDigitsNeeded++;
}
return NumDigitsNeeded + 1;
}
bool ErrorLog::WriteErrorString(char* ErrorString)
{
if(!ErrorString){
return false;
}
if(mFileBeingAccessed){
return false;
}
if(!OpenErrorLog()){
return false;
}
fputs(ErrorString, mFilePointer);
fputc('\n', mFilePointer); //NEW LINE CHARACTER IS REQUIRED.
CloseErrorLog();
return true;
}
bool ErrorLog::GetInternalErrorInf(int ErrorNumber)
{
//RIGHT. OKAY. THIS FILLS THE TEMPORARY ERROR INFORMATION STRUCTURE WITH STUFF.
//WE CANNOT INITIALIZE AN INSTANCE OF AN ERRORINFO UNTIL WE HAVE THE STRING AND THE ID.
long FirstAsterixPoint;
long OurErrorFrontAsterixPoint;
long OurErrorBackAsterixPoint;
long CurrentPos = 0;
long NumToMalloc;
char * TempBuf;
char * PureString;
int StringPos;
int PureStringStartPos;
int PureStringEndPos;
int PureStringLen;
int StringLen;
int CurrentError;
//FIRST, ELIMINATE WRONG CASES.
if(ErrorNumber < 0 || ErrorNumber >= mNumberOfErrors || !mErrorFileName || mErrorLogID < 0){
return false;
}
//NOW, WE UTILIZE AN ALGORITHM TO SEARCH THROUGH FILE. START BY MOVING TO THE FIRST ASTERIX.
if(!OpenErrorLog()){
return false;
}
fseek(mFilePointer, 0, SEEK_SET);
FirstAsterixPoint = SeekToNextAsterix();
if(FirstAsterixPoint == -1){
CloseErrorLog();
return false;
} //WE CAN NOW USE THIS FIRST ASTERIX POINT AS AN OFFSET.
OurErrorFrontAsterixPoint = FirstAsterixPoint;
for(CurrentError = -1; CurrentError < ErrorNumber - 1; CurrentError++){
SeekToNextAsterix();
OurErrorFrontAsterixPoint = SeekToNextAsterix();
}
//WE NOW SHOULD BE AT THE FIRST ASTERIX OF OUR DESIRED LINE.
//RUN TO THE NEXT ASTERIX, RETRIEVE THE DIFFERENCE, AND THAT'S OUR MALLOC AMOUNT... ADD 3 FOR NEWLINE, ENDCHAR, AND LF WACKINESS.
OurErrorBackAsterixPoint = SeekToNextAsterix();
if(OurErrorFrontAsterixPoint == -1 || OurErrorBackAsterixPoint == -1){
CloseErrorLog();
return false;
}
NumToMalloc = OurErrorBackAsterixPoint - OurErrorFrontAsterixPoint;
TempBuf = new char[NumToMalloc + 3];
//SHOULD BE ABLE TO SET BACK TO THE LAST ASTERIX, THEN DO AN FGETS, STRIP NEW LINE.
fseek(mFilePointer, OurErrorFrontAsterixPoint, SEEK_SET);
fgets(TempBuf, NumToMalloc, mFilePointer);
//THAT HAD OUGHT TO BE ALL WE NEED WITH THE FILE.
CloseErrorLog();
StripStringNewLine(TempBuf);
StringLen = strlen(TempBuf); //WE HAD BETTER BE SURE.
//TADA. NOW PARSE THE STRING.
for(StringPos = 0; StringPos < StringLen; StringPos++){
if(TempBuf[StringPos] == '-' && TempBuf[StringPos + 1] == ' ' && TempBuf[StringPos - 1] == ' '){ //THIS LOOKS LIKE OUR START POINT.
PureStringStartPos = StringPos + 2;
break;
}
}
if(PureStringStartPos == -1){
delete [] TempBuf;
return false;
}
PureStringEndPos = StringLen - 3; //ONE FOR '\0', ONE FOR *, AND ONE FOR ZERO-BASED COUNTING SYSTEM
PureStringLen = PureStringEndPos - PureStringStartPos;
PureString = new char[StringLen + 2];
for(int i = 0, k = PureStringStartPos; i < StringLen; i++, k++){
PureString[i] = TempBuf[k];
}
PureString[i] = '\0';
//WE GOT IT.
delete [] TempBuf;
ErrorInformation EInfo(ErrorNumber, PureString);
mTemporaryInfo = EInfo;
delete [] PureString;
return true;
}
int ErrorLog::SeekToNextAsterix()
{
int BogusChar;
if(!mFileBeingAccessed){
return -1;
}
do
{
BogusChar = fgetc(mFilePointer);
if(BogusChar == EOF){
return -1;
}
}while(BogusChar != '*');
return ftell(mFilePointer);
}
void ErrorLog::StripStringNewLine(char* String)
{
if(!String || strlen(String) < 1){
return;
}
int Len = strlen(String);
for(int i = Len; i >= 0; i--){
if(String[i] == '\n'){
String[i] = '\0';
return;
}
}
}
///////////////////////////////////////////////
// PUBLIC FUNCTIONS
///////////////////////////////////////////////
bool ErrorLog::AddError(char* ErrorDescription)
{
char* Default = "NO DESCRIPTION GIVEN";
char* OurNewString;
char* CharStringToCopyOver;
//ALLOW FOR NULL STRINGS TO BE PASSED.
if(!ErrorDescription){
CharStringToCopyOver = Default;
}
else{
CharStringToCopyOver = ErrorDescription;
}
OurNewString = new char [strlen(CharStringToCopyOver) + 8 + GetNumberIDDigits()]; //ALLOCATE EXTRA SPACE FOR CHARACTERS
sprintf(OurNewString, "*[%d] - %s*", mNumberOfErrors, CharStringToCopyOver);
if(!WriteErrorString(OurNewString)){
return false;
}
mNumberOfErrors++;
return true;
}
int ErrorLog::GetNumberOfErrors()
{
if(!mErrorFileName || mErrorLogID < 0 || mNumberOfErrors < 0){
return 0;
}
return mNumberOfErrors;
}
ErrorInformation ErrorLog::GetErrorInformation(int ErrorID)
{
ErrorInformation EInf;
if(GetInternalErrorInf(ErrorID)){
EInf = mTemporaryInfo;
}
return EInf;
}
void ErrorLog::DumpErrors(int NumToDisplayAtOnce)
{
// char* String;
// int ID;
int NumDisplayed;
int TotalDisplayed;
printf("Error Log Dump Beginning...\n");
printf("-----------------------------------\n");
if(mNumberOfErrors < 1){
printf("Error Log Is Clear.\n");
}
for(TotalDisplayed = 0; TotalDisplayed < mNumberOfErrors;){
for(NumDisplayed = 0; NumDisplayed < NumToDisplayAtOnce && TotalDisplayed < mNumberOfErrors; NumDisplayed++, TotalDisplayed++){
GetInternalErrorInf(TotalDisplayed);
printf("[%d] - %s\n", mTemporaryInfo.getErrorID(), mTemporaryInfo.getErrorString());
}
if(NumDisplayed >= NumToDisplayAtOnce && NumDisplayed < mNumberOfErrors){
printf("Holding...Press ENTER To Resume.\n");
getchar();
printf("Resuming Error Dump...\n");
}
}
printf("-----------------------------------\n");
printf("End Of Error Log Dump.\n");
}
char * ErrorLog::operator [] (int ErrorNum)
{
if(!GetInternalErrorInf(ErrorNum)){
return "ILLEGAL ERROR ADDRESS";
}
return mTemporaryInfo.getErrorString();
}