24 lines
561 B
ArmAsm
24 lines
561 B
ArmAsm
! _strncpy() Author: Kees J. Bot
|
|
! 1 Jan 1994
|
|
.sect .text; .sect .rom; .sect .data; .sect .bss
|
|
|
|
! char *_strncpy(char *s1, const char *s2, size_t ecx)
|
|
! Copy string s2 to s1.
|
|
!
|
|
.sect .text
|
|
.define __strncpy
|
|
.align 16
|
|
__strncpy:
|
|
mov edi, 12(ebp) ! edi = string s2
|
|
xorb al, al ! Look for a zero byte
|
|
mov edx, ecx ! Save maximum count
|
|
cld
|
|
repne
|
|
scasb ! Look for end of s2
|
|
sub edx, ecx ! Number of bytes in s2 including null
|
|
xchg ecx, edx
|
|
mov esi, 12(ebp) ! esi = string s2
|
|
mov edi, 8(ebp) ! edi = string s1
|
|
rep
|
|
movsb ! Copy bytes
|
|
ret
|