JudyL_funcs(3) Library Functions Manual JudyL_funcs(3) NAME JudyL functions - C library for creating and accessing a dynamic array of words, using any value of a word as an index SYNOPSIS PPvoid_t JudyLIns( PPvoid_t PPJLArray, Word_t Index, PJError_t PJError); int JudyLDel( PPvoid_t PPJLArray, Word_t Index, PJError_t PJError); PPvoid_t JudyLGet( Pcvoid_t PJLArray, Word_t Index, PJError_t PJError); Word_t JudyLCount( Pcvoid_t PJLArray, Word_t Index1, Word_t Index2, PJError_t PJError); PPvoid_t JudyLByCount( Pcvoid_t PJLArray, Word_t Nth, Word_t * PIndex, PJError_t PJError); Word_t JudyLFreeArray( PPvoid_t PPJLArray, PJError_t PJError); Word_t JudyLMemUsed( Pcvoid_t PJLArray); PPvoid_t JudyLFirst( Pcvoid_t PJLArray, Word_t * PIndex, PJError_t PJError); PPvoid_t JudyLNext( Pcvoid_t PJLArray, Word_t * PIndex, PJError_t PJError); PPvoid_t JudyLLast( Pcvoid_t PJLArray, Word_t * PIndex, PJError_t PJError); PPvoid_t JudyLPrev( Pcvoid_t PJLArray, Word_t * PIndex, PJError_t PJError); int JudyLFirstEmpty(Pcvoid_t PJLArray, Word_t * PIndex, PJError_t PJError); int JudyLNextEmpty( Pcvoid_t PJLArray, Word_t * PIndex, PJError_t PJError); int JudyLLastEmpty( Pcvoid_t PJLArray, Word_t * PIndex, PJError_t PJError); int JudyLPrevEmpty( Pcvoid_t PJLArray, Word_t * PIndex, 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 JudyL func- tions. See JudyL(3) for more information. The function call definitions are included here for completeness. One of the difficulties in using the JudyL function calls lies in determin- ing whether to pass a pointer or the address of a pointer. Since the func- tions that modify the JudyL array must also modify the pointer to the JudyL array, you must pass the address of the pointer rather than the pointer it- self. This often leads to hard-to-debug programmatic errors. In practice, the macros allow the compiler to catch programming errors when pointers in- stead of addresses of pointers are passed. The JudyL function calls have an additional parameter beyond those speci- fied 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 re- turned). 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 de- bugged. When the JUDYERROR_NOTEST macro is not specified, an error struc- ture is declared to store error information returned from the JudyL func- tions when an error occurs. Notice the placement of the & in the different functions. JudyLIns(&PJLArray, Index, &JError) #define JLI(PValue, PJLArray, Index) \ PValue = JudyLIns(&PJLArray, Index, PJE0) JudyLDel(&PJLArray, Index, &JError) #define JLD(Rc_int, PJLArray, Index) \ Rc_int = JudyLDel(&PJLArray, Index, PJE0) JudyLGet(PJLArray, Index, &JError) #define JLG(PValue, PJLArray, Index) \ PValue = JudyLGet(PJLArray, Index, PJE0) JudyLCount(PJLArray, Index1, Index2, &JError) #define JLC(Rc_word, PJLArray, Index1, Index2) \ Rc_word = JudyLCount(PJLArray, Index1, Index2, PJE0) JudyLByCount(PJLArray, Nth, &Index, &JError) #define JLBC(PValue, PJLArray, Nth, Index) \ PValue = JudyLByCount(PJLArray, Nth, &Index, PJE0) JudyLFreeArray(&PJLArray, &JError) #define JLFA(Rc_word, PJLArray) \ Rc_word = JudyLFreeArray(&PJLArray, PJE0) JudyLMemUsed(PJLArray) #define JLMU(Rc_word, PJLArray) \ Rc_word = JudyLMemUsed(PJLArray) JudyLFirst(PJLArray, &Index, &JError) #define JLF(PValue, PJLArray, Index) \ PValue = JudyLFirst(PJLArray, &Index, PJEO) JudyLNext(PJLArray, &Index, &JError) #define JLN(PValue, PJLArray, Index) \ PValue = JudyLNext(PJLArray, &Index, PJEO) JudyLLast(PJLArray, &Index, &JError) #define JLL(PValue, PJLArray, Index) \ PValue = JudyLLast(PJLArray, &Index, PJEO) JudyLPrev(PJLArray, &Index, &JError) #define JLP(PValue, PJLArray, Index) \ PValue = JudyLPrev(PJLArray, &Index, PJEO) JudyLFirstEmpty(PJLArray, &Index, &JError) #define JLFE(Rc_int, PJLArray, Index) \ Rc_int = JudyLFirstEmpty(PJLArray, &Index, PJEO) JudyLNextEmpty(PJLArray, &Index, &JError) #define JLNE(Rc_int, PJLArray, Index) \ Rc_int = JudyLNextEmpty(PJLArray, &Index, PJEO) JudyLLastEmpty(PJLArray, &Index, &JError) #define JLLE(Rc_int, PJLArray, Index) \ Rc_int = JudyLLastEmpty(PJLArray, &Index, PJEO) JudyLPrevEmpty(PJLArray, &Index, &JError) #define JLPE(Rc_int, PJLArray, Index) \ Rc_int = JudyLPrevEmpty(PJLArray, &Index, PJEO) 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/in- clude/Judy.h). Note: Callers should define JudyL 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 JudyL 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. SEE ALSO Judy(3), Judy1(3), JudyL(3), JudySL(3), JudyHS(3), malloc(), the Judy website, http://judy.sourceforge.net, for more information and Ap- plication Notes. JudyL_funcs(3)
NAME | SYNOPSIS | DESCRIPTION | AUTHOR | SEE ALSO
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