/* * Reconfigurable error handler */#include <stdio.h>#include <stdarg.h>#include <string.h>#if (UNIX | DOS_DJGPP)#include <unistd.h>#endif#include "device.h"/* output error message and return -1*/intGdError(const char *format, ...){	va_list args;	char 	buf[512];	va_start(args, format);	vsprintf(buf, format, args);	va_end(args);	write(2, buf, strlen(buf));	return -1;}/* null routine to consume messages */intGdErrorNull(const char *format, ...){	return -1;}