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-.\" Copyright (c) 1990, 1991, 1993
-.\"     The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     $OpenBSD: radixsort.3,v 1.14 2022/08/04 06:20:24 jsg Exp $
-.\"
-.Dd $Mdocdate: August 4 2022 $
-.Dt RADIXSORT 3
-.Os
-.Sh NAME
-.Nm radixsort ,
-.Nm sradixsort
-.Nd radix sort
-.Sh SYNOPSIS
-.In limits.h
-.In stdlib.h
-.Ft int
-.Fn radixsort "const u_char **base" "int nmemb" "const u_char *table" "u_int endbyte"
-.Ft int
-.Fn sradixsort "const u_char **base" "int nmemb" "const u_char *table" "u_int endbyte"
-.Sh DESCRIPTION
-The
-.Fn radixsort
-and
-.Fn sradixsort
-functions are implementations of radix sort.
-.Pp
-These functions sort an array of
-.Fa nmemb
-pointers to byte strings.
-The initial member 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 .
-.Pp
-Applications may specify a sort order by providing the
-.Fa table
-argument.
-If non-null,
-.Fa table
-must reference an array of
-.Dv 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
-.Dv 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.
-.Pp
-The
-.Fn sradixsort
-function is stable; that is, if two elements compare as equal, their
-order in the sorted array is unchanged.
-The
-.Fn sradixsort
-function uses additional memory sufficient to hold
-.Fa nmemb
-pointers.
-.Pp
-The
-.Fn radixsort
-function is not stable, but uses no additional memory.
-.Pp
-These functions are variants of most-significant-byte radix sorting; in
-particular, see D.E. Knuth's Algorithm R and section 5.2.5, exercise 10.
-They take linear time relative to the number of bytes in the strings.
-.Sh RETURN VALUES
-.Rv -std
-.Sh ERRORS
-.Bl -tag -width Er
-.It Bq Er EINVAL
-The value of the
-.Fa endbyte
-element of
-.Fa table
-is not 0 or 255.
-.El
-.Pp
-Additionally, the
-.Fn sradixsort
-function may fail and set
-.Va errno
-for any of the errors specified for the library routine
-.Xr malloc 3 .
-.Sh SEE ALSO
-.Xr sort 1 ,
-.Xr qsort 3
-.Rs
-.%A Knuth, D.E.
-.%D 1968
-.%B "The Art of Computer Programming"
-.%T "Sorting and Searching"
-.%V Vol. 3
-.%P pp. 170-178
-.Re
-.Rs
-.%A Paige, R.
-.%D 1987
-.%T "Three Partition Refinement Algorithms"
-.%J "SIAM J. Comput."
-.%V Vol. 16
-.%N No. 6
-.Re
-.Rs
-.%A McIlroy, P.
-.%D 1993
-.%B "Engineering Radix Sort"
-.%T "Computing Systems"
-.%V Vol. 6:1
-.%P pp. 5-27
-.Re
-.Sh HISTORY
-The
-.Fn radixsort
-function first appeared in
-.Bx 4.3 Net/2 .