glibc/sysdeps/generic/ffs.c
Ulrich Drepper 19212f875d Update.
1998-03-09 08:21  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/unix/sysv/linux/chown.c: Moved to ...
	* sysdeps/unix/sysv/linux/i386/chown.c: ...here.

	* sysdeps/unix/sysv/linux/i386/chown.c: Correct versioning information.
	* libc.map: Add chown to GLIBC_2.1.
	* sysdeps/unix/sysv/linux/i386/syscalls.list: Add s_chown here.
	* sysdeps/unix/sysv/linux/syscalls.list: Remove s_chown here.

1998-03-06  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/generic/ffs.S: Rename function to __ffs and make ffs a
	weak alias.
	* sysdeps/alpha/ffs.c: Likewise.
	* sysdeps/am29k/ffs.c: Likewise.
	* sysdeps/i386/ffs.c: Likewise.
	* sysdeps/i960/ffs.c: Likewise.
	* sysdeps/m68k/ffs.c: Likewise.
	* sysdeps/m88k/ffs.c: Likewise.
	* sysdeps/powerpc/ffs.c: Likewise.
	* sysdeps/rs6000/ffs.c: Likewise.
	* sysdeps/vax/ffs.s: Likewise.
	* string/string.h: Declare __ffs.
	* libc.map: Export it.
	* elf/dl-profile.c (_dl_start_profile): Use __ffs instead of
	__builtin_ffs, which is not guaranteed to be namespace clean.

1998-03-06  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* elf/sprof.c: Rewrite symbol handling to use the normal symbol
	table, which is much more likely to exist than debugging symbols.
	(printsym): Remove const.
	(load_shobj): Don't use _dl_pagesize.  Fix mapping of section
	header table.

	* libc.map: Export __profile_frequency, used by elf/sprof, to
	avoid infinite recursion during startup.

1998-03-09 12:16  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>
1998-03-09 09:11:57 +00:00

49 lines
1.8 KiB
C

/* Copyright (C) 1991, 1992, 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Torbjorn Granlund (tege@sics.se).
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 <limits.h>
#include <string.h>
#undef ffs
/* Find the first bit set in I. */
int
__ffs (i)
int i;
{
static const unsigned char table[] =
{
0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
};
unsigned int a;
unsigned int x = i & -i;
a = x <= 0xffff ? (x <= 0xff ? 0 : 8) : (x <= 0xffffff ? 16 : 24);
return table[x >> a] + a;
}
weak_alias (__ffs, ffs)