/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h>#include <bio.h> #include "pci.h"#include "vga.h" int vflag, Vflag; voiderror(char* format, ...){	char buf[512], *out;	va_list arg;	int n; 	sequencer(0, 1);	n = sprint(buf, "%s: ", argv0);	va_start(arg, format);	out = vseprint(buf+n, buf+sizeof(buf)-n, format, arg);	va_end(arg);	if(vflag)		Bprint(&stdout, "%s", buf+n);	Bflush(&stdout);	write(2, buf, out-buf);	exits("error");} voidtrace(char* format, ...){	char buf[512];	va_list arg; 	if(vflag || Vflag){		if(curprintindex){			curprintindex = 0;			Bprint(&stdout, "\n");		}		va_start(arg, format);		vseprint(buf, buf+sizeof(buf), format, arg);		va_end(arg);		Bprint(&stdout, "%s", buf);		if(Vflag)			print("%s", buf);	}}