mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 21:10:07 +00:00
7434ccadbb
1997-02-13 11:44 Andreas Jaeger <aj@arthur.pfalz.de> * stdlib/qsort.c: Add prototype for _quicksort. * stdlib/msort.c (qsort): Correct prototype for _quicksort. * sysdeps/i386/Makefile (CFLAGS-rtld.c): Change to prevent warning from dl-machine.h. 1997-02-13 18:18 Marcus G. Daniels <marcus@sysc.pdx.edu> * sysdeps/generic/dl-cache.c: Don't hardwire name of cache file. Allow user to overwrite it. 1997-02-13 17:55 Ulrich Drepper <drepper@cygnus.com> * libio/_G_config.h: Make sure win_t is also defined for old gcc versions. Reported by Andreas Jaeger. 1997-02-13 11:44 Andreas Jaeger <aj@arthur.pfalz.de> * db/btree/bt_split.c (bt_psplit): Fix typo in change of 1997-02-12. * time/tzfile.c (__tzfile_read): Change comment to follow change of 1997-02-12.
125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
/* An alternative to qsort, with an identical interface.
|
|
This file is part of the GNU C Library.
|
|
Copyright (C) 1992, 1995, 1996, 1997 Free Software Foundation, Inc.
|
|
Written by Mike Haertel, September 1988.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <memcopy.h>
|
|
#include <errno.h>
|
|
|
|
static void msort_with_tmp __P ((void *b, size_t n, size_t s,
|
|
__compar_fn_t cmp, char *t));
|
|
|
|
static void
|
|
msort_with_tmp (b, n, s, cmp, t)
|
|
void *b;
|
|
size_t n;
|
|
size_t s;
|
|
__compar_fn_t cmp;
|
|
char *t;
|
|
{
|
|
char *tmp;
|
|
char *b1, *b2;
|
|
size_t n1, n2;
|
|
|
|
if (n <= 1)
|
|
return;
|
|
|
|
n1 = n / 2;
|
|
n2 = n - n1;
|
|
b1 = b;
|
|
b2 = (char *) b + (n1 * s);
|
|
|
|
msort_with_tmp (b1, n1, s, cmp, t);
|
|
msort_with_tmp (b2, n2, s, cmp, t);
|
|
|
|
tmp = t;
|
|
|
|
if (s == OPSIZ && (b1 - (char *) 0) % OPSIZ == 0)
|
|
/* We are operating on aligned words. Use direct word stores. */
|
|
while (n1 > 0 && n2 > 0)
|
|
{
|
|
if ((*cmp) (b1, b2) <= 0)
|
|
{
|
|
--n1;
|
|
*((op_t *) tmp)++ = *((op_t *) b1)++;
|
|
}
|
|
else
|
|
{
|
|
--n2;
|
|
*((op_t *) tmp)++ = *((op_t *) b2)++;
|
|
}
|
|
}
|
|
else
|
|
while (n1 > 0 && n2 > 0)
|
|
{
|
|
if ((*cmp) (b1, b2) <= 0)
|
|
{
|
|
memcpy (tmp, b1, s);
|
|
b1 += s;
|
|
--n1;
|
|
}
|
|
else
|
|
{
|
|
memcpy (tmp, b2, s);
|
|
b2 += s;
|
|
--n2;
|
|
}
|
|
tmp += s;
|
|
}
|
|
if (n1 > 0)
|
|
memcpy (tmp, b1, n1 * s);
|
|
memcpy (b, t, (n - n2) * s);
|
|
}
|
|
|
|
void
|
|
qsort (b, n, s, cmp)
|
|
void *b;
|
|
size_t n;
|
|
size_t s;
|
|
__compar_fn_t cmp;
|
|
{
|
|
const size_t size = n * s;
|
|
|
|
if (size < 1024)
|
|
/* The temporary array is small, so put it on the stack. */
|
|
msort_with_tmp (b, n, s, cmp, __alloca (size));
|
|
else
|
|
{
|
|
/* It's somewhat large, so malloc it. */
|
|
int save = errno;
|
|
char *tmp = malloc (size);
|
|
if (tmp == NULL)
|
|
{
|
|
/* Couldn't get space, so use the slower algorithm
|
|
that doesn't need a temporary array. */
|
|
extern void _quicksort __P ((void *const __base,
|
|
size_t __nmemb, size_t __size,
|
|
__compar_fn_t __compar));
|
|
_quicksort (b, n, s, cmp);
|
|
}
|
|
else
|
|
{
|
|
msort_with_tmp (b, n, s, cmp, tmp);
|
|
free (tmp);
|
|
}
|
|
__set_errno (save);
|
|
}
|
|
}
|