VirtualBox

source: vbox/trunk/src/VBox/Runtime/common/string/strncmp.asm@ 81106

Last change on this file since 81106 was 76553, checked in by vboxsync, 6 years ago

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File size: 3.1 KB
Line 
1; $Id: strncmp.asm 76553 2019-01-01 01:45:53Z vboxsync $
2;; @file
3; IPRT - No-CRT strncmp - AMD64 & X86.
4;
5
6;
7; Copyright (C) 2006-2019 Oracle Corporation
8;
9; This file is part of VirtualBox Open Source Edition (OSE), as
10; available from http://www.virtualbox.org. This file is free software;
11; you can redistribute it and/or modify it under the terms of the GNU
12; General Public License (GPL) as published by the Free Software
13; Foundation, in version 2 as it comes in the "COPYING" file of the
14; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16;
17; The contents of this file may alternatively be used under the terms
18; of the Common Development and Distribution License Version 1.0
19; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20; VirtualBox OSE distribution, in which case the provisions of the
21; CDDL are applicable instead of those of the GPL.
22;
23; You may elect to license modified versions of this file under the
24; terms and conditions of either the GPL or the CDDL or both.
25;
26
27%include "iprt/asmdefs.mac"
28
29BEGINCODE
30
31;;
32; @param psz1 gcc: rdi msc: rcx x86:[esp+4] wcall: eax
33; @param psz2 gcc: rsi msc: rdx x86:[esp+8] wcall: edx
34; @param cch gcc: rdx msc: r8 x86:[esp+12] wcall: ebx
35RT_NOCRT_BEGINPROC strncmp
36 ; input
37%ifdef RT_ARCH_AMD64
38 %ifdef ASM_CALL64_MSC
39 %define psz1 rcx
40 %define psz2 rdx
41 %define cch r8
42 %else
43 %define psz1 rdi
44 %define psz2 rsi
45 %define cch rdx
46 %endif
47%elifdef ASM_CALL32_WATCOM
48 mov ecx, eax
49 %define psz1 ecx
50 %define psz2 edx
51 %define cch ebx
52
53%elifdef RT_ARCH_X86
54 mov ecx, [esp + 4]
55 mov edx, [esp + 8]
56 push ebx
57 mov ebx, [esp + 12+4]
58 %define psz1 ecx
59 %define psz2 edx
60 %define cch ebx
61%else
62 %error "Unknown arch"
63%endif
64
65 ;
66 ; The loop.
67 ;
68 test cch, cch
69 jz .equal
70.next:
71 mov al, [psz1]
72 mov ah, [psz2]
73 cmp al, ah
74 jne .not_equal
75 test al, al
76 jz .equal
77 dec cch
78 jz .equal
79
80 mov al, [psz1 + 1]
81 mov ah, [psz2 + 1]
82 cmp al, ah
83 jne .not_equal
84 test al, al
85 jz .equal
86 dec cch
87 jz .equal
88
89 mov al, [psz1 + 2]
90 mov ah, [psz2 + 2]
91 cmp al, ah
92 jne .not_equal
93 test al, al
94 jz .equal
95 dec cch
96 jz .equal
97
98 mov al, [psz1 + 3]
99 mov ah, [psz2 + 3]
100 cmp al, ah
101 jne .not_equal
102 test al, al
103 jz .equal
104 dec cch
105 jz .equal
106
107 add psz1, 4
108 add psz2, 4
109 jmp .next
110
111.equal:
112 xor eax, eax
113%ifndef ASM_CALL32_WATCOM
114 %ifdef RT_ARCH_X86
115 pop ebx
116 %endif
117%endif
118 ret
119
120.not_equal:
121 movzx ecx, ah
122 and eax, 0ffh
123 sub eax, ecx
124%ifndef ASM_CALL32_WATCOM
125 %ifdef RT_ARCH_X86
126 pop ebx
127 %endif
128%endif
129 ret
130ENDPROC RT_NOCRT(strncmp)
131
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