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