hdestroy man page on Ultrix

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hsearch(3)							    hsearch(3)

       hsearch, hcreate, hdestroy - manage hash search tables

       #include <search.h>

       ENTRY ∗hsearch (item, action)
       ENTRY item;
       ACTION action;

       int hcreate (nel)
       unsigned nel;

       void hdestroy ( )

       The  subroutine	is  a hash-table search routine generalized from Knuth
       (6.4) Algorithm D.  It returns a pointer into a hash  table  indicating
       the  location  at which an entry can be found.  The item is a structure
       of type ENTRY (defined in the <search.h> header	file)  containing  two
       pointers:  item.key  points to the comparison key, and item.data points
       to any other data to be associated with that key.  (Pointers  to	 types
       other  than  character  should  be  cast to pointer-to-character.)  The
       action is a member of an enumeration type ACTION indicating the	dispo‐
       sition  of  the	entry if it cannot be found in the table.  ENTER indi‐
       cates that the item should be inserted in the table at  an  appropriate
       point.  FIND indicates that no entry should be made.  Unsuccessful res‐
       olution is indicated by the return of a NULL pointer.

       The subroutine allocates sufficient space for the table,	 and  must  be
       called before is used.  The nel is an estimate of the maximum number of
       entries that the table will  contain.   This  number  may  be  adjusted
       upward  by  the	algorithm  in  order  to obtain certain mathematically
       favorable circumstances.

       The subroutine destroys the  search  table,  and	 may  be  followed  by
       another call to

       Only one hash search table may be active at any given time.

       The  subroutine returns a NULL pointer if either the action is FIND and
       the item could not be found or the action is ENTER  and	the  table  is

       The  subroutine returns zero if it cannot allocate sufficient space for
       the table.

See Also
       bsearch(3), lsearch(3), string(3), tsearch(3)


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