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Update.
2002-01-16 Roger Sayle <roger@eyesopen.com> * stdlib/msort.c (msort_with_tmp): Replace implementation with more efficient "Towers of Hanoi" mergesort. (hanoi_sort, hanoi_sort_int, hanoi_sort_long): New functions, for generic, sizeof(int) and sizeof(long) variants respectively. * manial/syslog.texi (openlog): Describe possible problems with first parameter. Patch by Christopher Allen Wing <wingc@engin.umich.edu>.
This commit is contained in:
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ChangeLog
11
ChangeLog
@ -1,5 +1,16 @@
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2002-01-16 Roger Sayle <roger@eyesopen.com>
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* stdlib/msort.c (msort_with_tmp): Replace implementation with
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more efficient "Towers of Hanoi" mergesort.
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(hanoi_sort, hanoi_sort_int, hanoi_sort_long): New functions,
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for generic, sizeof(int) and sizeof(long) variants respectively.
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2002-01-17 Ulrich Drepper <drepper@redhat.com>
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* manial/syslog.texi (openlog): Describe possible problems with
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first parameter.
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Patch by Christopher Allen Wing <wingc@engin.umich.edu>.
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* nscd/nscd.c (drop_privileges): Removed. Adjust caller.
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* nscd/connections.c (begin_drop_privileges): New function.
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(finish_drop_privileges): New function.
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@ -1,3 +1,7 @@
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2002-01-17 Ulrich Drepper <drepper@redhat.com>
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* charmaps/MACINTOSH: Update to Apple's latest definition.
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2002-01-16 Ulrich Drepper <drepper@redhat.com>
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* charmaps/GB18030: Update.
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@ -211,7 +211,7 @@ CHARMAP
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<U00A0> /xca NO-BREAK SPACE
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<U00C0> /xcb LATIN CAPITAL LETTER A WITH GRAVE
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<U00C3> /xcc LATIN CAPITAL LETTER A WITH TILDE
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<U2126> /xcd OHM SIGN
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<U00D5> /xcd LATIN CAPITAL LETTER O WITH TILDE
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<U0152> /xce LATIN CAPITAL LIGATURE OE
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<U0153> /xcf LATIN SMALL LIGATURE OE
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<U2013> /xd0 EN DASH
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@ -225,7 +225,7 @@ CHARMAP
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<U00FF> /xd8 LATIN SMALL LETTER Y WITH DIAERESIS
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<U0178> /xd9 LATIN CAPITAL LETTER Y WITH DIAERESIS
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<U2044> /xda FRACTION SLASH
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<U00A4> /xdb CURRENCY SIGN
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<U20AC> /xdb EURO SIGN
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<U2039> /xdc SINGLE LEFT-POINTING ANGLE QUOTATION MARK
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<U203A> /xdd SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
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<UFB01> /xde LATIN SMALL LIGATURE FI
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@ -252,6 +252,8 @@ CHARMAP
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<U00DB> /xf3 LATIN CAPITAL LETTER U WITH CIRCUMFLEX
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<U00D9> /xf4 LATIN CAPITAL LETTER U WITH GRAVE
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<U0131> /xf5 LATIN SMALL LETTER DOTLESS I
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<U02C6> /xf6 MODIFIER LETTER CIRCUMFLEX ACCENT
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<U02DC> /xf7 SMALL TILDE
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<U00AF> /xf8 MACRON
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<U02D8> /xf9 BREVE
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<U02D9> /xfa DOT ABOVE (Mandarin Chinese light tone)
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@ -146,8 +146,7 @@ The symbols referred to in this section are declared in the file
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@comment syslog.h
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@comment BSD
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@deftypefun void openlog (char *@var{ident}, int @var{option},
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int @var{facility})
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@deftypefun void openlog (const char *@var{ident}, int @var{option}, int @var{facility})
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@code{openlog} opens or reopens a connection to Syslog in preparation
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for submitting messages.
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@ -157,6 +156,46 @@ for submitting messages.
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to identify the source of the message, and people conventionally set it
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to the name of the program that will submit the messages.
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If @var{ident} is NULL, or if @code{openlog} is not called, the default
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identification string used in Syslog messages will be the program name,
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taken from argv[0].
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Please note that the string pointer @var{ident} will be retained
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internally by the Syslog routines. You must not free the memory that
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@var{ident} points to. It is also dangerous to pass a reference to an
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automatic variable since leaving the scope would mean ending the
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lifetime of the variable. If you want to change the @var{ident} string,
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you must call @code{openlog} again; overwriting the string pointed to by
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@var{ident} is not thread-safe.
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You can cause the Syslog routines to drop the reference to @var{ident} and
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go back to the default string (the program name taken from argv[0]), by
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calling @code{closelog}: @xref{closelog}.
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In particular, if you are writing code for a shared library that might get
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loaded and then unloaded (e.g. a PAM module), and you use @code{openlog},
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you must call @code{closelog} before any point where your library might
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get unloaded, as in this example:
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@smallexample
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#include <syslog.h>
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void
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shared_library_function (void)
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@{
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openlog ("mylibrary", option, priority);
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syslog (LOG_INFO, "shared library has been invoked");
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closelog ();
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@}
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@end smallexample
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Without the call to @code{closelog}, future invocations of @code{syslog}
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by the program using the shared library may crash, if the library gets
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unloaded and the memory containing the string @code{"mylibrary"} becomes
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unmapped. This is a limitation of the BSD syslog interface.
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@code{openlog} may or may not open the @file{/dev/log} socket, depending
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on @var{option}. If it does, it tries to open it and connect it as a
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stream socket. If that doesn't work, it tries to open it and connect it
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@ -383,12 +422,21 @@ The symbols referred to in this section are declared in the file
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@deftypefun void closelog (void)
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@code{closelog} closes the current Syslog connection, if there is one.
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This include closing the @file{dev/log} socket, if it is open.
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This includes closing the @file{dev/log} socket, if it is open.
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@code{closelog} also sets the identification string for Syslog messages
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back to the default, if @code{openlog} was called with a non-NULL argument
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to @var{ident}. The default identification string is the program name
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taken from argv[0].
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There is very little reason to use this function. It does not flush any
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buffers; you can reopen a Syslog connection without closing it first;
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The connection gets closed automatically on exec or exit.
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@code{closelog} has primarily aesthetic value.
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If you are writing shared library code that uses @code{openlog} to
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generate custom syslog output, you should use @code{closelog} to drop the
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GNU C library's internal reference to the @var{ident} pointer when you are
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done. Please read the section on @code{openlog} for more information:
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@xref{openlog}.
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@code{closelog} does not flush any buffers. You do not have to call
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@code{closelog} before re-opening a Syslog connection with @code{initlog}.
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Syslog connections are automatically closed on exec or exit.
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@end deftypefun
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406
stdlib/msort.c
406
stdlib/msort.c
@ -1,7 +1,9 @@
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/* An alternative to qsort, with an identical interface.
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This file is part of the GNU C Library.
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Copyright (C) 1992, 1995-1997, 1999, 2000, 2001 Free Software Foundation, Inc.
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Written by Mike Haertel, September 1988.
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Copyright (C) 1992, 1995-1997, 1999, 2000, 2001, 2002
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Free Software Foundation, Inc.
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Original Implementation by Mike Haertel, September 1988.
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Towers of Hanoi Mergesort by Roger Sayle, January 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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@ -19,70 +21,372 @@
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02111-1307 USA. */
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#include <alloca.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <memcopy.h>
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#include <errno.h>
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static void msort_with_tmp (void *b, size_t n, size_t s,
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__compar_fn_t cmp, char *t);
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static void
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msort_with_tmp (void *b, size_t n, size_t s, __compar_fn_t cmp,
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char *t)
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/* Check whether pointer P is aligned for access by type T. */
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#define TYPE_ALIGNED(P,T) (((char *) (P) - (char *) 0) % __alignof__ (T) == 0)
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static int hanoi_sort (char *b, size_t n, size_t s,
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__compar_fn_t cmp, char *t);
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static int hanoi_sort_int (int *b, size_t n,
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__compar_fn_t cmp, int *t);
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#if INT_MAX != LONG_MAX
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static int hanoi_sort_long (long int *b, size_t n,
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__compar_fn_t cmp, long int *t);
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#endif
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static void msort_with_tmp (void *b, size_t n, size_t s,
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__compar_fn_t cmp, void *t);
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/* This routine implements "Towers of Hanoi Mergesort". The algorithm
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sorts the n elements of size s pointed to by array b using comparison
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function cmp. The argument t points to a suitable temporary buffer.
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If the return value is zero, the sorted array is returned in b, and
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for non-zero return values the sorted array is returned in t. */
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static int
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hanoi_sort (char *b, size_t n, size_t s, __compar_fn_t cmp, char *t)
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{
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char *tmp;
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char *b1, *b2;
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size_t n1, n2;
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char *b1,*b2;
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char *t1,*t2;
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char *s1,*s2;
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size_t size;
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int result;
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char *ptr;
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if (n <= 1)
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return;
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return 0;
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n1 = n / 2;
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if (n == 2)
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{
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b2 = b + s;
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if ((*cmp) (b, b2) <= 0)
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return 0;
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memcpy (__mempcpy (t, b2, s), b, s);
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return 1;
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}
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n1 = n/2;
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n2 = n - n1;
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/* n1 < n2! */
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size = n1 * s;
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b1 = b;
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b2 = (char *) b + (n1 * s);
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b2 = b + size;
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msort_with_tmp (b1, n1, s, cmp, t);
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msort_with_tmp (b2, n2, s, cmp, t);
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t1 = t;
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t2 = t + size;
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tmp = t;
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if (s == OPSIZ && (b1 - (char *) 0) % OPSIZ == 0)
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/* We are operating on aligned words. Use direct word stores. */
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while (n1 > 0 && n2 > 0)
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{
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if ((*cmp) (b1, b2) <= 0)
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{
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--n1;
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*((op_t *) tmp)++ = *((op_t *) b1)++;
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}
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else
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{
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--n2;
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*((op_t *) tmp)++ = *((op_t *) b2)++;
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}
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}
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/* Recursively call hanoi_sort to sort the two halves of the array.
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Depending upon the return values, determine the values s1 and s2
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the locations of the two sorted subarrays, ptr, the location to
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contain the sorted array and result, the return value for this
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function. Note that "ptr = result? t : b". */
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if (hanoi_sort (b1, n1, s, cmp, t1))
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{
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if (hanoi_sort (b2, n2, s, cmp, t2))
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{
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result = 0;
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ptr = b;
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s1 = t1;
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s2 = t2;
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}
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else
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{
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result = 0;
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ptr = b;
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s1 = t1;
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s2 = b2;
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}
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}
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else
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while (n1 > 0 && n2 > 0)
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{
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if ((*cmp) (b1, b2) <= 0)
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{
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tmp = (char *) __mempcpy (tmp, b1, s);
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b1 += s;
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--n1;
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}
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else
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{
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tmp = (char *) __mempcpy (tmp, b2, s);
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b2 += s;
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--n2;
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}
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}
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if (n1 > 0)
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memcpy (tmp, b1, n1 * s);
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memcpy (b, t, (n - n2) * s);
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{
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if (hanoi_sort (b2, n2, s, cmp, t2))
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{
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result = 1;
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ptr = t;
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s1 = b1;
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s2 = t2;
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}
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else
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{
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result = 1;
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ptr = t;
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s1 = b1;
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s2 = b2;
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}
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}
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/* Merge the two sorted arrays s1 and s2 of n1 and n2 elements
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respectively, placing the result in ptr. On entry, n1 > 0
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&& n2 > 0, and with each iteration either n1 or n2 is decreased
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until either reaches zero, and the loop terminates via return. */
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for (;;)
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{
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if ((*cmp) (s1, s2) <= 0)
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{
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ptr = (char *) __mempcpy (ptr, s1, s);
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s1 += s;
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--n1;
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if (n1 == 0)
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{
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if (ptr != s2)
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memcpy (ptr, s2, n2 * s);
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return result;
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}
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}
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else
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{
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ptr = (char *) __mempcpy (ptr, s2, s);
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s2 += s;
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--n2;
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if (n2 == 0)
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{
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memcpy (ptr, s1, n1 * s);
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return result;
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}
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}
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}
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}
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/* This routine is a variant of hanoi_sort that is optimized for the
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case where items to be sorted are the size of ints, and both b and
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t are suitably aligned. The parameter s in not needed as it is
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known to be sizeof(int). */
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static int
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hanoi_sort_int (int *b, size_t n, __compar_fn_t cmp, int *t)
|
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{
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size_t n1, n2;
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int *b1,*b2;
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int *t1,*t2;
|
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int *s1,*s2;
|
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int result;
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int *ptr;
|
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|
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if (n <= 1)
|
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return 0;
|
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|
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if (n == 2)
|
||||
{
|
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if ((*cmp) (b, b + 1) <= 0)
|
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return 0;
|
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t[0] = b[1];
|
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t[1] = b[0];
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return 1;
|
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}
|
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|
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n1 = n/2;
|
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n2 = n - n1;
|
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/* n1 < n2! */
|
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b1 = b;
|
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b2 = b + n1;
|
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|
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t1 = t;
|
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t2 = t + n1;
|
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|
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/* Recursively call hanoi_sort_int to sort the two halves. */
|
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if (hanoi_sort_int (b1, n1, cmp, t1))
|
||||
{
|
||||
if (hanoi_sort_int (b2, n2, cmp, t2))
|
||||
{
|
||||
result = 0;
|
||||
ptr = b;
|
||||
s1 = t1;
|
||||
s2 = t2;
|
||||
}
|
||||
else
|
||||
{
|
||||
result = 0;
|
||||
ptr = b;
|
||||
s1 = t1;
|
||||
s2 = b2;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
if (hanoi_sort_int (b2, n2, cmp, t2))
|
||||
{
|
||||
result = 1;
|
||||
ptr = t;
|
||||
s1 = b1;
|
||||
s2 = t2;
|
||||
}
|
||||
else
|
||||
{
|
||||
result = 1;
|
||||
ptr = t;
|
||||
s1 = b1;
|
||||
s2 = b2;
|
||||
}
|
||||
}
|
||||
|
||||
/* Merge n1 elements from s1 and n2 elements from s2 into ptr. */
|
||||
for (;;)
|
||||
{
|
||||
if ((*cmp) (s1, s2) <= 0)
|
||||
{
|
||||
*ptr++ = *s1++;
|
||||
--n1;
|
||||
if (n1 == 0)
|
||||
{
|
||||
if (ptr != s2)
|
||||
memcpy (ptr, s2, n2 * sizeof (int));
|
||||
return result;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
*ptr++ = *s2++;
|
||||
--n2;
|
||||
if (n2 == 0)
|
||||
{
|
||||
memcpy (ptr, s1, n1 * sizeof (int));
|
||||
return result;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
#if INT_MAX != LONG_MAX
|
||||
/* This routine is a variant of hanoi_sort that is optimized for the
|
||||
case where items to be sorted are the size of longs, and both b and
|
||||
t are suitably aligned. The parameter s in not needed as it is
|
||||
known to be sizeof(long). In case sizeof(int)== sizeof(long) we
|
||||
do not need this code since it would be the same as hanoi_sort_int. */
|
||||
static int
|
||||
hanoi_sort_long (long int *b, size_t n, __compar_fn_t cmp, long int *t)
|
||||
{
|
||||
size_t n1, n2;
|
||||
long int *b1,*b2;
|
||||
long int *t1,*t2;
|
||||
long int *s1,*s2;
|
||||
int result;
|
||||
long int *ptr;
|
||||
|
||||
if (n <= 1)
|
||||
return 0;
|
||||
|
||||
if (n == 2)
|
||||
{
|
||||
if ((*cmp) (b, b + 1) <= 0)
|
||||
return 0;
|
||||
t[0] = b[1];
|
||||
t[1] = b[0];
|
||||
return 1;
|
||||
}
|
||||
|
||||
n1 = n/2;
|
||||
n2 = n - n1;
|
||||
/* n1 < n2! */
|
||||
|
||||
b1 = b;
|
||||
b2 = b + n1;
|
||||
|
||||
t1 = t;
|
||||
t2 = t + n1;
|
||||
|
||||
/* Recursively call hanoi_sort_long to sort the two halves. */
|
||||
if (hanoi_sort_long (b1, n1, cmp, t1))
|
||||
{
|
||||
if (hanoi_sort_long (b2, n2, cmp, t2))
|
||||
{
|
||||
result = 0;
|
||||
ptr = b;
|
||||
s1 = t1;
|
||||
s2 = t2;
|
||||
}
|
||||
else
|
||||
{
|
||||
result = 0;
|
||||
ptr = b;
|
||||
s1 = t1;
|
||||
s2 = b2;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
if (hanoi_sort_long (b2, n2, cmp, t2))
|
||||
{
|
||||
result = 1;
|
||||
ptr = t;
|
||||
s1 = b1;
|
||||
s2 = t2;
|
||||
}
|
||||
else
|
||||
{
|
||||
result = 1;
|
||||
ptr = t;
|
||||
s1 = b1;
|
||||
s2 = b2;
|
||||
}
|
||||
}
|
||||
|
||||
/* Merge n1 elements from s1 and n2 elements from s2 into ptr. */
|
||||
for (;;)
|
||||
{
|
||||
if ((*cmp) (s1, s2) <= 0)
|
||||
{
|
||||
*ptr++ = *s1++;
|
||||
--n1;
|
||||
if (n1 == 0)
|
||||
{
|
||||
if (ptr != s2)
|
||||
memcpy (ptr, s2, n2 * sizeof (long));
|
||||
return result;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
*ptr++ = *s2++;
|
||||
--n2;
|
||||
if (n2 == 0)
|
||||
{
|
||||
memcpy (ptr, s1, n1 * sizeof (long));
|
||||
return result;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
/* This routine preserves the original interface to msort_with_tmp and
|
||||
determines which variant of hanoi_sort to call, based upon item size
|
||||
and alignment. */
|
||||
|
||||
static void
|
||||
msort_with_tmp (void *b, size_t n, size_t s, __compar_fn_t cmp, void *t)
|
||||
{
|
||||
const size_t size = n * s;
|
||||
|
||||
if (s == sizeof (int) && TYPE_ALIGNED (b, int))
|
||||
{
|
||||
if (hanoi_sort_int (b, n, cmp, t))
|
||||
memcpy (b, t, size);
|
||||
}
|
||||
#if INT_MAX != LONG_MAX
|
||||
else if (s == sizeof (long int) && TYPE_ALIGNED (b, long int))
|
||||
{
|
||||
if (hanoi_sort_long (b, n, cmp, t))
|
||||
memcpy (b, t, size);
|
||||
}
|
||||
#endif
|
||||
else
|
||||
{
|
||||
/* Call the generic implementation. */
|
||||
if (hanoi_sort (b, n, s, cmp, t))
|
||||
memcpy (b, t, size);
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
@ -93,7 +397,7 @@ qsort (void *b, size_t n, size_t s, __compar_fn_t cmp)
|
||||
if (size < 1024)
|
||||
{
|
||||
void *buf = __alloca (size);
|
||||
|
||||
|
||||
/* The temporary array is small, so put it on the stack. */
|
||||
msort_with_tmp (b, n, s, cmp, buf);
|
||||
}
|
||||
@ -130,7 +434,7 @@ qsort (void *b, size_t n, size_t s, __compar_fn_t cmp)
|
||||
measured in bytes. */
|
||||
|
||||
/* If the memory requirements are too high don't allocate memory. */
|
||||
if (size / pagesize > phys_pages)
|
||||
if ((long int) (size / pagesize) > phys_pages)
|
||||
_quicksort (b, n, s, cmp);
|
||||
else
|
||||
{
|
||||
|
Loading…
Reference in New Issue
Block a user