NAME

       JudyHS  functions  - C library for creating and accessing a dynamic array, using an array-
       of-bytes of a length: Length as an Index and a word as a Value.

SYNOPSIS

       PPvoid_t JudyHSIns(PPvoid_t PPJHS, void *Index, Word_t Length, PJError_t PJError);
       int      JudyHSDel(PPvoid_t PPJHS, void *Index, Word_t Length, PJError_t PJError);
       PPvoid_t JudyHSGet(Pcvoid_t  PJHS, void *Index, Word_t Length, PJError_t PJError);
       Word_t   JudyHSFreeArray(PPvoid_t PPJHS, PJError_t PJError);

DESCRIPTION

       A macro equivalent exists for each function call.  Because the macro forms  are  sometimes
       faster and have a simpler error handling interface than the equivalent functions, they are
       the preferred way of calling the JudyHS functions.  See JudyHS(3)  for  more  information.
       The function call definitions are included here for completeness.

       One  of the difficulties in using the JudyHS function calls lies in determining whether to
       pass a pointer or the address of a pointer.  Since the functions that  modify  the  JudyHS
       array  must  also modify the pointer to the JudyHS array, you must pass the address of the
       pointer rather than the pointer itself.  This often leads  to  hard-to-debug  programmatic
       errors.   In  practice,  the  macros  allow  the compiler to catch programming errors when
       pointers instead of addresses of pointers are passed.

       The JudyHS function calls have an additional parameter beyond those specified in the macro
       calls.   This  parameter is either a pointer to an error structure, or NULL (in which case
       the error information is not returned -- only PJERR in the return parameter).

       In the following descriptions, the functions are described in terms of how the macros  use
       them.  This is the suggested use of the macros after your program has been fully debugged.
       When the JUDYERROR_NOTEST macro is not specified, an error structure is declared to  store
       error information returned from the JudyHS functions when an error occurs.

       Notice the placement of the & in the different functions.

        JudyHSIns(&PJHS, Index, Length, &JError)

                      #define JHSI(PValue, PJHS, Index) \
                         PValue = JudyLIns(&PJHS, Index, PJE0)

        JudyHSDel(&PJHS, Index, Length, &JError)

                      #define JHSD(Rc_int, PJHS, Index, Length) \
                         Rc_int = JudyHSDel(&PJHS, Index, Length, PJE0)

        JudyHSGet(PJHS, Index, Length)

                      #define JHSG(PValue, PJHS, Index, Length) \
                         PValue = JudyHSIns(PJHS, Index, Length)

        JudyHSFreeArray(&PJHS, &JError)

                      #define JHSFA(Rc_word, PJHS) \
                         Rc_word = JudyHSFreeArray(&PJHS, PJE0)

       Definitions  for  all  the Judy functions, the types Pvoid_t, Pcvoid_t, PPvoid_t, Word_t ,
       JError_t, and PJError_t, the constants  NULL,  JU_ERRNO_*,  JERR,  PPJERR,  and  PJE0  are
       provided  in  the  Judy.h header file (/usr/include/Judy.h).  Note:  Callers should define
       JudyHS arrays as type Pvoid_t, which can  be  passed  by  value  to  functions  that  take
       Pcvoid_t (constant Pvoid_t), and also by address to functions that take PPvoid_t.

       The  return  type  from most JudyHS functions is PPvoid_t so that the values stored in the
       array can be pointers to other objects, which is a typical usage, or cast to  a  Word_t  *
       when a pointer to a value is required instead of a pointer to a pointer.

AUTHOR

       JudyHS was invented and implemented by Doug Baskins after retiring from Hewlett-Packard.

SEE ALSO

       Judy(3), Judy1(3), JudyL(3), JudySL(3), JudyHS(3),
       malloc(),
       the Judy website, http://judy.sourceforge.net, for more information and Application Notes.

                                                                                  JudyHS_funcs(3)