/*  * 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 <ndb.h> /* remove a from t and free it */Ndbtuple*ndbdiscard(Ndbtuple *t, Ndbtuple *a){	Ndbtuple *nt; 	/* unchain a */	for(nt = t; nt != nil; nt = nt->entry){		if(nt->line == a)			nt->line = a->line;		if(nt->entry == a)			nt->entry = a->entry;	} 	/* a may be start of chain */	if(t == a)		t = a->entry; 	/* free a */	a->entry = nil;	ndbfree(a); 	ndbsetmalloctag(t, getcallerpc(&t));	return t;}