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avl(3): import changes from plan 9

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CC=plan9port.codebot
http://codereview.appspot.com/4536105
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David du Colombier 2011-06-02 13:43:02 -04:00 • committed by Russ Cox
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commit e63f0507e9
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27
man/man3/avl.3
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@ -24,6 +24,7 @@ void deleteavl(Avltree *tree, Avl *key, Avl **oldp);
void endwalk(Avlwalk *walk); void endwalk(Avlwalk *walk);
void insertavl(Avltree *tree, Avl *new, Avl **oldp); void insertavl(Avltree *tree, Avl *new, Avl **oldp);
Avl *lookupavl(Avltree *tree, Avl *key); Avl *lookupavl(Avltree *tree, Avl *key);
Avl *searchavl(Avltree *tree, Avl *key, int neighbor);
Avltree *mkavltree(int(*cmp)(Avl*, Avl*)); Avltree *mkavltree(int(*cmp)(Avl*, Avl*));
.EE .EE
.SH DESCRIPTION .SH DESCRIPTION
@ -60,6 +61,32 @@ comparison function,
or or
.B nil .B nil
if none. if none.
.PP
.I Searchavl
returns the
.I tree
node that matches
.I key
by
.IR tree 's
comparison function, if it exists.
If it does not, and
.I neighbor
is positive, it returns the nearest node whose
.I key
is greater or
.B nil
if there is none and, if
.I neighbor
is negative, it returns the nearest node whose
.I key
is less or
.B nil
if there is none.
It is an error to set
.I neighbor
to values other than \-1, 0, or +1.
.PP
.I Deleteavl .I Deleteavl
removes the node matching removes the node matching
.I key .I key