mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-27 05:00:15 +00:00
36 lines
1.2 KiB
C
36 lines
1.2 KiB
C
/* Determine the length of a string. For Intel 80x86, x>=3.
|
|
Copyright (C) 1991-2016 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 Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <string.h>
|
|
|
|
size_t
|
|
strlen (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;
|
|
}
|
|
libc_hidden_builtin_def (strlen)
|