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WebSVN – planix.SVN – Blame – /os/branches/feature_posix/sys/src/libndb/ndbsubstitute.c – Rev 2

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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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/* replace a in t with b, the line structure in b is lost, c'est la vie */
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Ndbtuple*
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ndbsubstitute(Ndbtuple *t, Ndbtuple *a, Ndbtuple *b)
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{
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	Ndbtuple *nt;
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	if(a == b){
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		ndbsetmalloctag(t, getcallerpc(&t));
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		return t;
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	}
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	if(b == nil){
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		t = ndbdiscard(t, a);
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		ndbsetmalloctag(t, getcallerpc(&t));
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		return t;
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	}
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	/* all pointers to a become pointers to b */
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	for(nt = t; nt != nil; nt = nt->entry){
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		if(nt->line == a)
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			nt->line = b;
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		if(nt->entry == a)
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			nt->entry = b;
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	}
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	/* end of b chain points to a's successors */
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	for(nt = b; nt->entry; nt = nt->entry)
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		nt->line = nt->entry;
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	nt->line = a->line;
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	nt->entry = a->entry;
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	a->entry = nil;
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	ndbfree(a);
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	if(a == t){
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		ndbsetmalloctag(b, getcallerpc(&t));
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		return b;
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	}else{
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		ndbsetmalloctag(t, getcallerpc(&t));
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		return t;
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	}
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}