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| 1 | ! bcmp() Author: Kees J. Bot
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| 2 | ! 2 Jan 1994
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| 3 | .sect .text; .sect .rom; .sect .data; .sect .bss
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| 4 |
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| 5 | ! int bcmp(const void *s1, const void *s2, size_t n)
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| 6 | ! Compare two chunks of memory.
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| 7 | ! This is a BSD routine that escaped from the kernel. Don't use.
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| 8 | ! (Alas it is not without some use, it reports the number of bytes
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| 9 | ! after the bytes that are equal. So it can't be simply replaced.)
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| 10 | !
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| 11 | .sect .text
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| 12 | .define _bcmp
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| 13 | .align 16
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| 14 | _bcmp:
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| 15 | push ebp
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| 16 | mov ebp, esp
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| 17 | push 16(ebp)
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| 18 | push 12(ebp)
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| 19 | push 8(ebp)
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| 20 | call _memcmp ! Let memcmp do the work
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| 21 | test eax, eax
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| 22 | jz equal
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| 23 | sub edx, 8(ebp) ! Memcmp was nice enough to leave "esi" in edx
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| 24 | dec edx ! Number of bytes that are equal
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| 25 | mov eax, 16(ebp)
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| 26 | sub eax, edx ! Number of bytes that are unequal
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| 27 | equal: leave
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| 28 | ret
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