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# strlen.S

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    00001 .globl strlen
    00002 strlen:
    00003         pushl   %edi
    00004         movl    8(%esp),%edi            /* string address */
    00005         cld                             /* set search forward */
    00006         xorl    %eax,%eax               /* set search for null terminator */
    00007         movl    $-1,%ecx                /* set search for lots of characters */
    00008         repne                           /* search! */
    00009         scasb
    00010         notl    %ecx                    /* get length by taking complement */
    00011         leal    -1(%ecx),%eax           /* and subtracting one */
    00012         popl    %edi
    00013         ret