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sradixsort (3)
  • >> sradixsort (3) ( FreeBSD man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    radixsort , sradixsort
    
     - radix sort
    
     
    

    LIBRARY

    Lb libc
    
     
    

    SYNOPSIS

       #include <limits.h>
       #include <stdlib.h>
    int radixsort (const unsigned char **base int nmemb const unsigned char *table unsigned endbyte);
    int sradixsort (const unsigned char **base int nmemb const unsigned char *table unsigned endbyte);
     

    DESCRIPTION

    The radixsort ();
    and sradixsort ();
    functions are implementations of radix sort.

    These functions sort an array of pointers to byte strings, the initial member of which is referenced by Fa base . The byte strings may contain any values; the end of each string is denoted by the user-specified value Fa endbyte .

    Applications may specify a sort order by providing the Fa table argument. If non- NULL Fa table must reference an array of UCHAR_MAX + 1 bytes which contains the sort weight of each possible byte value. The end-of-string byte must have a sort weight of 0 or 255 (for sorting in reverse order). More than one byte may have the same sort weight. The Fa table argument is useful for applications which wish to sort different characters equally, for example, providing a table with the same weights for A-Z as for a-z will result in a case-insensitive sort. If Fa table is NULL, the contents of the array are sorted in ascending order according to the ASCII order of the byte strings they reference and Fa endbyte has a sorting weight of 0.

    The sradixsort ();
    function is stable, that is, if two elements compare as equal, their order in the sorted array is unchanged. The sradixsort ();
    function uses additional memory sufficient to hold Fa nmemb pointers.

    The radixsort ();
    function is not stable, but uses no additional memory.

    These functions are variants of most-significant-byte radix sorting; in particular, see An D.E. Knuth Ns 's "Algorithm R" and section 5.2.5, exercise 10. They take linear time relative to the number of bytes in the strings.  

    RETURN VALUES

    Rv -std radixsort  

    ERRORS

    Bq Er EINVAL
    The value of the Fa endbyte element of Fa table is not 0 or 255.

    Additionally, the sradixsort ();
    function may fail and set errno for any of the errors specified for the library routine malloc(3).  

    SEE ALSO

    sort(1), qsort(3)

    Knuth, D.E. 1968 "The Art of Computer Programming" "Sorting and Searching" Vol. 3 pp. 170-178
    Paige, R. 1987 "Three Partition Refinement Algorithms" "SIAM J. Comput." Vol. 16 No. 6
    McIlroy, P. 1993 "Engineering Radix Sort" "Computing Systems" Vol. 6:1 pp. 5-27
     

    HISTORY

    The radixsort ();
    function first appeared in BSD 4.4


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    SEE ALSO
    HISTORY


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