37 lines
1.3 KiB
C
37 lines
1.3 KiB
C
/* strlen -- determine the length of a string.
|
|
For Intel 80x86, x>=3.
|
|
Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
|
|
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., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
#include <ansidecl.h>
|
|
#include <string.h>
|
|
|
|
size_t
|
|
DEFUN(strlen, (str), CONST char *str)
|
|
{
|
|
int cnt;
|
|
|
|
asm("cld\n" /* Search forward. */
|
|
/* Some old versions of gas need `repne' instead of `repnz'. */
|
|
"repnz\n" /* Look for a zero byte. */
|
|
"scasb" /* %0, %1, %3 */ :
|
|
"=c" (cnt) : "D" (str), "0" (-1), "a" (0));
|
|
|
|
return -2 - cnt;
|
|
}
|