ref: a6ccb66d9c0748d44cd622d6a700d1ad6447cada
dir: /sys/src/libndb/ndbdiscard.c/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <ndb.h>
/* remove a from t and free it */
Ndbtuple*
ndbdiscard(Ndbtuple *t, Ndbtuple *a)
{
Ndbtuple *nt;
/* unchain a */
for(nt = t; nt != nil; nt = nt->entry){
if(nt->line == a)
nt->line = a->line;
if(nt->entry == a)
nt->entry = a->entry;
}
/* a may be start of chain */
if(t == a)
t = a->entry;
/* free a */
a->entry = nil;
ndbfree(a);
return t;
}