diff options
Diffstat (limited to 'lib/libc/arch/i386/string/strlen.S')
| -rw-r--r-- | lib/libc/arch/i386/string/strlen.S | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/lib/libc/arch/i386/string/strlen.S b/lib/libc/arch/i386/string/strlen.S new file mode 100644 index 00000000000..809ca2a118c --- /dev/null +++ b/lib/libc/arch/i386/string/strlen.S @@ -0,0 +1,23 @@ +/* + * Written by J.T. Conklin <jtc@netbsd.org>. + * Public domain. + */ + +#include <machine/asm.h> + +#if defined(LIBC_SCCS) + RCSID("$NetBSD: strlen.S,v 1.6 1995/04/28 22:58:13 jtc Exp $") +#endif + +ENTRY(strlen) + pushl %edi + movl 8(%esp),%edi /* string address */ + cld /* set search forward */ + xorl %eax,%eax /* set search for null terminator */ + movl $-1,%ecx /* set search for lots of characters */ + repne /* search! */ + scasb + notl %ecx /* get length by taking complement */ + leal -1(%ecx),%eax /* and subtracting one */ + popl %edi + ret |