37 lines
736 B
ArmAsm
37 lines
736 B
ArmAsm
|
! strrchr() Author: Kees J. Bot
|
||
|
|
! 2 Jan 1994
|
||
|
|
.sect .text; .sect .rom; .sect .data; .sect .bss
|
||
|
|
|
||
|
|
! char *strrchr(const char *s, int c)
|
||
|
|
! Look for the last occurrence a character in a string.
|
||
|
|
!
|
||
|
|
.sect .text
|
||
|
|
.define _strrchr
|
||
|
|
.align 16
|
||
|
|
_strrchr:
|
||
|
|
push ebp
|
||
|
|
mov ebp, esp
|
||
|
|
push edi
|
||
|
|
mov edi, 8(ebp) ! edi = string
|
||
|
|
mov ecx, -1
|
||
|
|
xorb al, al
|
||
|
|
cld
|
||
|
|
repne
|
||
|
|
scasb ! Look for the end of the string
|
||
|
|
not ecx ! -1 - ecx = Length of the string + null
|
||
|
|
dec edi ! Put edi back on the zero byte
|
||
|
|
movb al, 12(ebp) ! The character to look for
|
||
|
|
std ! Downwards search
|
||
|
|
repne
|
||
|
|
scasb
|
||
|
|
cld ! Direction bit back to default
|
||
|
|
jne failure
|
||
|
|
lea eax, 1(edi) ! Found it
|
||
|
|
pop edi
|
||
|
|
pop ebp
|
||
|
|
ret
|
||
|
|
failure:xor eax, eax ! Not there
|
||
|
|
pop edi
|
||
|
|
pop ebp
|
||
|
|
ret
|