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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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#include <ndbhf.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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csgetvalue(char *netroot, char *attr, char *val, char *rattr, Ndbtuple **pp)
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{
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	Ndbtuple *t, *first, *last;
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	int n, linefound;
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	char line[1024];
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	int fd;
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	int oops = 0;
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	char *rv;
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	if(pp)
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		*pp = nil;
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	rv = nil;
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	if(netroot)
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		snprint(line, sizeof(line), "%s/cs", netroot);
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	else
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		strcpy(line, "/net/cs");
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	fd = open(line, ORDWR);
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	if(fd < 0)
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		return 0;
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	seek(fd, 0, 0);
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	snprint(line, sizeof(line), "!%s=%s %s=*", attr, val, rattr);
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	if(write(fd, line, strlen(line)) < 0){
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		close(fd);
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		return 0;
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	}
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	seek(fd, 0, 0);
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	first = last = 0;
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	linefound = 0;
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	for(;;){
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		n = read(fd, line, sizeof(line)-2);
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		if(n <= 0)
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			break;
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		line[n] = '\n';
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		line[n+1] = 0;
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		t = _ndbparseline(line);
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		if(t == 0)
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			continue;
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		if(first)
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			last->entry = t;
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		else
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			first = t;
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		last = t;
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		while(last->entry)
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			last = last->entry;
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		for(; t; t = t->entry){
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			if(linefound == 0){
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				if(strcmp(rattr, t->attr) == 0){
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					linefound = 1;
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					rv = strdup(t->val);
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				}
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			}
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		}
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	}
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	close(fd);
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	if(oops){
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		werrstr("buffer too short");
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		ndbfree(first);
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		return nil;
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	}
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	if(pp){
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		setmalloctag(first, getcallerpc(&netroot));
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		*pp = first;
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	} else
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		ndbfree(first);
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	return rv;
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}
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Ndbtuple*
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csgetval(char *netroot, 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 = csgetvalue(netroot, 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(&netroot));
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	return t;
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}