1 /* strlen -- determine the length of a string.
3 Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
4 Contributed by Torbjorn Granlund (tege@sics.se).
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If
18 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
19 Cambridge, MA 02139, USA. */
25 DEFUN(strlen
, (str
), CONST
char *str
)
29 asm("cld\n" /* Search forward. */
30 /* Some old versions of gas need `repne' instead of `repnz'. */
31 "repnz\n" /* Look for a zero byte. */
32 "scasb" /* %0, %1, %3 */ :
33 "=c" (cnt
) : "D" (str
), "0" (-1), "a" (0));