1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
TEXT memccpy(SB),$0
MOVQ n+24(FP), CX
CMPQ CX, $0
JEQ none
MOVQ p2+8(FP), DI
MOVBLZX c+16(FP), AX
CLD
/*
* find the character in the second string
*/
REPN; SCASB
JEQ found
/*
* if not found, set count to 'n'
*/
none:
MOVL $0, AX
MOVQ n+24(FP), BX
JMP memcpy
/*
* if found, set count to bytes thru character
*/
found:
MOVQ DI, AX
SUBQ p2+8(FP), AX
MOVQ AX, BX
ADDQ RARG, AX
/*
* copy the memory
*/
memcpy:
MOVQ RARG, DI
MOVQ p2+8(FP), SI
/*
* copy whole longs, if aligned
*/
MOVQ DI, DX
ORQ SI, DX
ANDL $3, DX
JNE c3
MOVQ BX, CX
SHRQ $2, CX
REP; MOVSL
/*
* copy the rest, by bytes
*/
ANDL $3, BX
c3:
MOVQ BX, CX
REP; MOVSB
RET
|
