Ubuntu Manpage: JudySL functions - C library for creating and accessing a dynamic array, using a null-

Provided by: libjudy-dev_1.0.5-1ubuntu1_amd64

NAME

       JudySL  functions  -  C  library for creating and accessing a dynamic array, using a null-
       terminated string as an index (associative array)

SYNOPSIS

       PPvoid_t JudySLIns(      PPvoid_t PPJSLArray, const uint8_t * Index, PJError_t PJError);
       int      JudySLDel(      PPvoid_t PPJSLArray, const uint8_t * Index, PJError_t PJError);
       PPvoid_t JudySLGet(      Pcvoid_t  PJSLArray, const uint8_t * Index, PJError_t PJError);
       Word_t   JudySLFreeArray(PPvoid_t PPJSLArray, PJError_t PJError);
       PPvoid_t JudySLFirst(    Pcvoid_t  PJSLArray,       uint8_t * Index, PJError_t PJError);
       PPvoid_t JudySLNext(     Pcvoid_t  PJSLArray,       uint8_t * Index, PJError_t PJError);
       PPvoid_t JudySLLast(     Pcvoid_t  PJSLArray,       uint8_t * Index, PJError_t PJError);
       PPvoid_t JudySLPrev(     Pcvoid_t  PJSLArray,       uint8_t * Index, 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 JudySL functions.  See JudySL(3)  for  more  information.
       The function call definitions are included here for completeness.

       One  of the difficulties in using the JudySL function calls lies in determining whether to
       pass a pointer or the address of a pointer.  Since the functions that  modify  the  JudySL
       array  must  also modify the pointer to the JudySL 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 JudySL 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 detailed error information is not returned).

       In the following descriptions, the functions are described in terms of how the macros  use
       them  (only  in the case of #define JUDYERROR_NOTEST 1).  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
       JudySL functions when an error occurs.

       Notice the placement of the & in the different functions.

        JudySLIns(&PJSLArray, Index, &JError)

                      #define JSLI(PValue, PJSLArray, Index) \
                         PValue = JudyLIns(&PJSLArray, Index, PJE0)

        JudySLDel(&PJSLArray, Index, &JError)

                      #define JSLD(Rc_int, PJSLArray, Index) \
                         Rc_int = JudySLDel(&PJSLArray, Index, PJE0)

        JudySLGet(PJSLArray, Index, &JError)

                      #define JSLG(PValue, PJSLArray, Index) \
                         PValue = JudySLIns(PJSLArray, Index, PJE0)

        JudySLFreeArray(&PJSLArray, &JError)

                      #define JSLFA(Rc_word, PJSLArray) \
                         Rc_word = JudySLFreeArray(&PJSLArray, PJE0)

        JudySLFirst(PJSLArray, Index, &JError)

                      #define JSLF(PValue, PJSLArray, Index) \
                         PValue = JudySLFirst(PJSLArray, Index, PJE0)

        JudySLNext(PJSLArray, Index, &JError)

                      #define JSLN(PValue, PJSLArray, Index) \
                         PValue = JudySLNext(PJSLArray, Index, PJE0)

        JudySLLast(PJSLArray, Index, &JError)

                      #define JSLL(PValue, PJSLArray, Index) \
                         PValue = JudySLLast(PJSLArray, Index, PJE0)

        JudySLPrev(PJSLArray, Index, &JError)

                      #define JSLP(PValue, PJSLArray, Index) \
                         PValue = JudySLPrev(PJSLArray, Index, 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
       JudySL  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 JudySL 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

       Judy was invented by Doug Baskins and implemented by Hewlett-Packard.

NAME

SYNOPSIS

DESCRIPTION

AUTHOR

SEE ALSO