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Annotation of sys/lib/libkern/arch/i386/strlen.S, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: strlen.S,v 1.2 1996/09/27 06:47:51 mickey Exp $       */
                      2:
                      3: /*
                      4:  * Written by J.T. Conklin <jtc@netbsd.org>.
                      5:  * Public domain.
                      6:  */
                      7:
                      8: #include <machine/asm.h>
                      9:
                     10: ENTRY(strlen)
                     11:        pushl   %edi
                     12:        movl    8(%esp),%edi            /* string address */
                     13:        cld                             /* set search forward */
                     14:        xorl    %eax,%eax               /* set search for null terminator */
                     15:        movl    $-1,%ecx                /* set search for lots of characters */
                     16:        repne                           /* search! */
                     17:        scasb
                     18:        notl    %ecx                    /* get length by taking complement */
                     19:        leal    -1(%ecx),%eax           /* and subtracting one */
                     20:        popl    %edi
                     21:        ret