source: trunk/minix/lib/i386/string/bcmp.s@ 10

!       bcmp()                                          Author: Kees J. Bot
!                                                               2 Jan 1994
.sect .text; .sect .rom; .sect .data; .sect .bss

! int bcmp(const void *s1, const void *s2, size_t n)
!       Compare two chunks of memory.
!       This is a BSD routine that escaped from the kernel.  Don't use.
!       (Alas it is not without some use, it reports the number of bytes
!       after the bytes that are equal.  So it can't be simply replaced.)
!
.sect .text
.define _bcmp
        .align  16
_bcmp:
        push    ebp
        mov     ebp, esp
        push    16(ebp)
        push    12(ebp)
        push    8(ebp)
        call    _memcmp         ! Let memcmp do the work
        test    eax, eax
        jz      equal
        sub     edx, 8(ebp)     ! Memcmp was nice enough to leave "esi" in edx
        dec     edx             ! Number of bytes that are equal
        mov     eax, 16(ebp)
        sub     eax, edx        ! Number of bytes that are unequal
equal:  leave
        ret