ref: 314faec39447f98c0dfd96a91dbd25fd757d106d
dir: /sys/src/libndb/ndbgetval.c/
#include <u.h> #include <libc.h> #include <bio.h> #include "ndb.h" /* * search for a tuple that has the given 'attr=val' and also 'rattr=x'. * copy 'x' into 'buf' and return the whole tuple. * * return nil if not found. */ char* ndbgetvalue(Ndb *db, Ndbs *s, char *attr, char *val, char *rattr, Ndbtuple **pp) { Ndbtuple *t, *nt; char *rv; Ndbs temps; if(s == nil) s = &temps; if(pp) *pp = nil; t = ndbsearch(db, s, attr, val); while(t != nil){ nt = ndbfindattr(t, s->t, rattr); if(nt != nil){ rv = strdup(nt->val); if(pp != nil) *pp = t; else ndbfree(t); return rv; } ndbfree(t); t = ndbsnext(s, attr, val); } return nil; }