39 lines
678 B
C
39 lines
678 B
C
#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 nil 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 != nil){
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nt = ndbfindattr(t, s->t, rattr);
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if(nt != nil){
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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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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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