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