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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:17:27 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:17:27 +0000
commitf215e02bf85f68d3a6106c2a1f4f7f063f819064 (patch)
tree6bb5b92c046312c4e95ac2620b10ddf482d3fa8b /src/VBox/Runtime/common/string/strncpy.asm
parentInitial commit. (diff)
downloadvirtualbox-f215e02bf85f68d3a6106c2a1f4f7f063f819064.tar.xz
virtualbox-f215e02bf85f68d3a6106c2a1f4f7f063f819064.zip
Adding upstream version 7.0.14-dfsg.upstream/7.0.14-dfsg
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/VBox/Runtime/common/string/strncpy.asm')
-rw-r--r--src/VBox/Runtime/common/string/strncpy.asm139
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diff --git a/src/VBox/Runtime/common/string/strncpy.asm b/src/VBox/Runtime/common/string/strncpy.asm
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+; $Id: strncpy.asm $
+;; @file
+; IPRT - No-CRT strncpy - AMD64 & X86.
+;
+
+;
+; Copyright (C) 2006-2023 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)
+