mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-06 11:08:43 +00:00
19 lines
565 B
ArmAsm
19 lines
565 B
ArmAsm
.file "strncpy.S"
|
|
|
|
.section .text
|
|
.global _strncpy
|
|
.type _strncpy,@function
|
|
_strncpy:
|
|
mov r1, r4 ; Save a copy of the dest pointer.
|
|
mov r3, r5 ; Save a copy of the byte count
|
|
smovu ; Copy the bytes
|
|
cmp #0, r3 ; If we have copied the number of bytes requested
|
|
beq 1f ; then skip the next bit:
|
|
add r4, r5, r1 ; Point to the last byte that we are supposed to write.
|
|
sub r3, r1 ; Subtract the number of bytes left to be written.
|
|
mov #0, r2 ; Fill the remaining bytes with NULs,
|
|
sstr.b
|
|
1:
|
|
mov r4, r1 ; Return the destination pointer
|
|
rts
|