#include "u.h"#include "lib.h"#include "dat.h"#include "fns.h"#include "error.h" Label*pwaserror(void){	if(up->nerrlab == NERR)		panic("error stack overflow");	return &up->errlab[up->nerrlab++];} voidnexterror(void){	longjmp(up->errlab[--up->nerrlab].buf, 1);} voiderror(char *e){	kstrcpy(up->errstr, e, ERRMAX);	setjmp(up->errlab[NERR-1].buf);	nexterror();}