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
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
; $Id: strncpy.asm $
;; @file
; IPRT - No-CRT strncpy - AMD64 & X86.
;
;
; Copyright (C) 2006-2022 Oracle and/or its affiliates.
;
; This file is part of VirtualBox base platform packages, as
; available from https://www.virtualbox.org.
;
; This program is free software; you can redistribute it and/or
; modify it under the terms of the GNU General Public License
; as published by the Free Software Foundation, in version 3 of the
; License.
;
; This program is distributed in the hope that it will be useful, but
; WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
; General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, see <https://www.gnu.org/licenses>.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
; in the VirtualBox distribution, in which case the provisions of the
; CDDL are applicable instead of those of the GPL.
;
; You may elect to license modified versions of this file under the
; terms and conditions of either the GPL or the CDDL or both.
;
; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
;
%include "iprt/asmdefs.mac"
BEGINCODE
;;
; @param pszDst gcc: rdi msc: rcx x86:[esp+4] wcall: eax
; @param pszSrc gcc: rsi msc: rdx x86:[esp+8] wcall: edx
; @param cbMax gcc: rdx msc: r8 x86:[esp+12] wcall: ebx
RT_NOCRT_BEGINPROC strncpy
; input
%ifdef RT_ARCH_AMD64
%ifdef ASM_CALL64_MSC
%define pszDst rcx
%define pszSrc rdx
%define cbMax r8
%else
%define pszDst rdi
%define pszSrc rsi
%define cbMax rdx
%endif
mov r9, pszDst
%else
%ifdef ASM_CALL32_WATCOM
mov ecx, eax
%define pszDst ecx
%define pszSrc edx
%define cbMax ebx
%else
mov ecx, [esp + 4]
mov edx, [esp + 8]
push ebx
mov ebx, [esp + 12 + 4]
%define pszDst ecx
%define pszSrc edx
%define cbMax ebx
%endif
push pszDst
%endif
;
; The rolled out loop.
;
.next:
cmp cbMax, 4
jb .simple_intro
mov al, [pszSrc]
mov [pszDst], al
test al, al
jz .done
mov al, [pszSrc + 1]
mov [pszDst + 1], al
test al, al
jz .done
mov al, [pszSrc + 2]
mov [pszDst + 2], al
test al, al
jz .done
mov al, [pszSrc + 3]
mov [pszDst + 3], al
test al, al
jz .done
add pszDst, 4
add pszSrc, 4
sub cbMax, 4
jmp .next
;
; Char by char.
;
.simple_intro:
test cbMax, cbMax
jz .done
.simple_next:
mov al, [pszSrc]
mov [pszDst], al
test al, al
jz .done
dec cbMax
jz .done
inc pszSrc
inc pszDst
jmp .simple_next
.done:
%ifdef RT_ARCH_AMD64
mov rax, r9
%else
%ifndef ASM_CALL32_WATCOM
pop ebx
%endif
pop eax
%endif
ret
ENDPROC RT_NOCRT(strncpy)
|
