1 d957951b 2005-02-11 devnull #include <u.h>
 2 d957951b 2005-02-11 devnull #include <libc.h>
 3 d957951b 2005-02-11 devnull #include <bio.h>
 4 d957951b 2005-02-11 devnull #include "ndb.h"
 5 d957951b 2005-02-11 devnull 
 6 d957951b 2005-02-11 devnull /*
 7 d957951b 2005-02-11 devnull  *  search for a tuple that has the given 'attr=val' and also 'rattr=x'.
 8 d957951b 2005-02-11 devnull  *  copy 'x' into 'buf' and return the whole tuple.
 9 d957951b 2005-02-11 devnull  *
10 d957951b 2005-02-11 devnull  *  return 0 if not found.
11 d957951b 2005-02-11 devnull  */
12 d957951b 2005-02-11 devnull char*
13 d957951b 2005-02-11 devnull ndbgetvalue(Ndb *db, Ndbs *s, char *attr, char *val, char *rattr, Ndbtuple **pp)
14 d957951b 2005-02-11 devnull {
15 d957951b 2005-02-11 devnull 	Ndbtuple *t, *nt;
16 d957951b 2005-02-11 devnull 	char *rv;
17 d957951b 2005-02-11 devnull 	Ndbs temps;
18 d957951b 2005-02-11 devnull 
19 d957951b 2005-02-11 devnull 	if(s == nil)
20 d957951b 2005-02-11 devnull 		s = &temps;
21 d957951b 2005-02-11 devnull 	if(pp)
22 d957951b 2005-02-11 devnull 		*pp = nil;
23 d957951b 2005-02-11 devnull 	t = ndbsearch(db, s, attr, val);
24 d957951b 2005-02-11 devnull 	while(t){
25 d957951b 2005-02-11 devnull 		/* first look on same line (closer binding) */
26 d957951b 2005-02-11 devnull 		nt = s->t;
27 d957951b 2005-02-11 devnull 		for(;;){
28 d957951b 2005-02-11 devnull 			if(strcmp(rattr, nt->attr) == 0){
29 d957951b 2005-02-11 devnull 				rv = strdup(nt->val);
30 d957951b 2005-02-11 devnull 				if(pp != nil)
31 d957951b 2005-02-11 devnull 					*pp = t;
32 d957951b 2005-02-11 devnull 				else
33 d957951b 2005-02-11 devnull 					ndbfree(t);
34 d957951b 2005-02-11 devnull 				return rv;
35 d957951b 2005-02-11 devnull 			}
36 d957951b 2005-02-11 devnull 			nt = nt->line;
37 d957951b 2005-02-11 devnull 			if(nt == s->t)
38 d957951b 2005-02-11 devnull 				break;
39 d957951b 2005-02-11 devnull 		}
40 d957951b 2005-02-11 devnull 		/* search whole tuple */
41 d957951b 2005-02-11 devnull 		for(nt = t; nt; nt = nt->entry){
42 d957951b 2005-02-11 devnull 			if(strcmp(rattr, nt->attr) == 0){
43 d957951b 2005-02-11 devnull 				rv = strdup(nt->val);
44 d957951b 2005-02-11 devnull 				if(pp != nil)
45 d957951b 2005-02-11 devnull 					*pp = t;
46 d957951b 2005-02-11 devnull 				else
47 d957951b 2005-02-11 devnull 					ndbfree(t);
48 d957951b 2005-02-11 devnull 				return rv;
49 d957951b 2005-02-11 devnull 			}
50 d957951b 2005-02-11 devnull 		}
51 d957951b 2005-02-11 devnull 		ndbfree(t);
52 d957951b 2005-02-11 devnull 		t = ndbsnext(s, attr, val);
53 d957951b 2005-02-11 devnull 	}
54 d957951b 2005-02-11 devnull 	return nil;
55 d957951b 2005-02-11 devnull }
56 d957951b 2005-02-11 devnull 
57 d957951b 2005-02-11 devnull Ndbtuple*
58 d957951b 2005-02-11 devnull ndbgetval(Ndb *db, Ndbs *s, char *attr, char *val, char *rattr, char *buf)
59 d957951b 2005-02-11 devnull {
60 d957951b 2005-02-11 devnull 	Ndbtuple *t;
61 d957951b 2005-02-11 devnull 	char *p;
62 d957951b 2005-02-11 devnull 
63 d957951b 2005-02-11 devnull 	p = ndbgetvalue(db, s, attr, val, rattr, &t);
64 d957951b 2005-02-11 devnull 	if(p == nil){
65 d957951b 2005-02-11 devnull 		if(buf != nil)
66 d957951b 2005-02-11 devnull 			*buf = 0;
67 d957951b 2005-02-11 devnull 	} else {
68 d957951b 2005-02-11 devnull 		if(buf != nil){
69 d957951b 2005-02-11 devnull 			strncpy(buf, p, Ndbvlen-1);
70 d957951b 2005-02-11 devnull 			buf[Ndbvlen-1] = 0;
71 d957951b 2005-02-11 devnull 		}
72 d957951b 2005-02-11 devnull 		free(p);
73 d957951b 2005-02-11 devnull 	}
74 d957951b 2005-02-11 devnull 	return t;
75 d957951b 2005-02-11 devnull }