// Error handling routines, and global structures
// Copyright (C) 2000 Core Technologies.

// This file is part of e93.
//
// e93 is free software; you can redistribute it and/or modify
// it under the terms of the e93 LICENSE AGREEMENT.
//
// e93 is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// e93 LICENSE AGREEMENT for more details.
//
// You should have received a copy of the e93 LICENSE AGREEMENT
// along with e93; see the file "LICENSE.TXT".

#include	"includes.h"

static char
	errorTraceBuffer[2][1024];		// ping-pong error trace buffers
static unsigned int
	errorTraceIndex;

void SetError(const char *format,...)
// Add error description to the start of the error trace buffer
{
	va_list
		args;
	char
		tempBuffer[1024];

	va_start(args,format);
	if(errorTraceBuffer[errorTraceIndex][0])					// see if something already in the buffer
	{
		vsnprintf(tempBuffer,sizeof(tempBuffer),format,args);	// make temp string
		snprintf(&errorTraceBuffer[errorTraceIndex^1][0],sizeof(errorTraceBuffer[0]),"%s; %s",tempBuffer,&errorTraceBuffer[errorTraceIndex][0]);	// make the string
		errorTraceIndex^=1;										// flip to the other buffer
	}
	else
	{
		vsnprintf(&errorTraceBuffer[errorTraceIndex][0],sizeof(errorTraceBuffer[0]),format,args);	// build string directly into error buffer
	}
	va_end(args);
}

void SetStdCLibError()
// When an error occurs within a standard C library function, call this
// and it will turn the standard C library information into an extended library
// error
{
	SetError("%s",strerror(errno));
}

const char *GetErrorTrace()
// Return a pointer to the error trace string.
{
	return(&errorTraceBuffer[errorTraceIndex][0]);
}

void ClearErrorTrace()
// Clear the error trace
{
	errorTraceBuffer[0][0]='\0';				// clear out the error trace buffer
	errorTraceIndex=0;
}

void UnInitErrors()
// Undo whatever InitErrors did.
{
}

bool InitErrors()
// Initialize the error handling code.
// If there is a problem return false.
// If false is returned, it is NOT legal to call GetError to find out what failed,
// You just have to report that the initialization failed.
{
	ClearErrorTrace();
	return(true);
}