From 28f540f45bbacd939bfd07f213bcad2bf730b1bf Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sat, 18 Feb 1995 01:27:10 +0000 Subject: initial import --- sysdeps/i386/strlen.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 sysdeps/i386/strlen.c (limited to 'sysdeps/i386/strlen.c') diff --git a/sysdeps/i386/strlen.c b/sysdeps/i386/strlen.c new file mode 100644 index 0000000000..3c1398b461 --- /dev/null +++ b/sysdeps/i386/strlen.c @@ -0,0 +1,36 @@ +/* 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 +#include + +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; +} -- cgit v1.2.1