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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include "ndb.h"
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/*
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 *  search for a tuple that has the given 'attr=val' and also 'rattr=x'.
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 *  copy 'x' into 'buf' and return the whole tuple.
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 *
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 *  return 0 if not found.
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 */
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char*
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ndbgetvalue(Ndb *db, Ndbs *s, char *attr, char *val, char *rattr, Ndbtuple **pp)
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{
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	Ndbtuple *t, *nt;
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	char *rv;
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	Ndbs temps;
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	if(s == nil)
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		s = &temps;
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	if(pp)
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		*pp = nil;
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	t = ndbsearch(db, s, attr, val);
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	while(t){
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		/* first look on same line (closer binding) */
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		nt = s->t;
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		for(;;){
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			if(strcmp(rattr, nt->attr) == 0){
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				rv = strdup(nt->val);
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				if(pp != nil)
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					*pp = t;
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				else
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					ndbfree(t);
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				return rv;
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			}
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			nt = nt->line;
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			if(nt == s->t)
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				break;
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		}
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		/* search whole tuple */
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		for(nt = t; nt; nt = nt->entry){
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			if(strcmp(rattr, nt->attr) == 0){
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				rv = strdup(nt->val);
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				if(pp != nil)
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					*pp = t;
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				else
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					ndbfree(t);
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				return rv;
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			}
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		}
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		ndbfree(t);
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		t = ndbsnext(s, attr, val);
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	}
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	return nil;
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}
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Ndbtuple*
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ndbgetval(Ndb *db, Ndbs *s, char *attr, char *val, char *rattr, char *buf)
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{
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	Ndbtuple *t;
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	char *p;
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	p = ndbgetvalue(db, s, attr, val, rattr, &t);
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	if(p == nil){
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		if(buf != nil)
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			*buf = 0;
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	} else {
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		if(buf != nil){
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			strncpy(buf, p, Ndbvlen-1);
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			buf[Ndbvlen-1] = 0;
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		}
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		free(p);
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	}
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	ndbsetmalloctag(t, getcallerpc(&db));
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	return t;
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}