176 lines
4.3 KiB
NASM
176 lines
4.3 KiB
NASM
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TITLE "String support routines"
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; Copyright (c) 1989 Microsoft Corporation
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; Module Name:
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; stringsup.asm
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; Abstract:
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; This module implements suplimentary routines for performing string
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; operations.
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; Author:
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; Larry Osterman (larryo) 18-Sep-1991
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; Environment:
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; Any mode.
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; Revision History:
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.386p
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include callconv.inc ; calling convention macros
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_TEXT SEGMENT DWORD PUBLIC 'CODE'
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ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
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page ,132
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subttl "RtlInitAnsiString"
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; VOID
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; RtlInitAnsiString(
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; OUT PANSI_STRING DestinationString,
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; IN PSZ SourceString OPTIONAL
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; )
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; Routine Description:
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; The RtlInitAnsiString function initializes an NT counted string.
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; The DestinationString is initialized to point to the SourceString
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; and the Length and MaximumLength fields of DestinationString are
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; initialized to the length of the SourceString, which is zero if
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; SourceString is not specified.
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; Arguments:
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; (TOS+4) = DestinationString - Pointer to the counted string to initialize
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; (TOS+8) = SourceString - Optional pointer to a null terminated string that
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; the counted string is to point to.
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; Return Value:
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; None.
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; NOTE:
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; This routine assumes that the string is less than 64K in size.
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cPublicProc _RtlInitString ,2
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cPublicFpo 2,2
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push edi
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mov edi,[esp]+8+4 ; (edi)= SourceString
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mov edx,[esp]+4+4 ; (esi)= DestinationString
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mov DWORD PTR [edx], 0 ; (Destination).Length = (Destination).MaximumLength = 0
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mov DWORD PTR [edx]+4, edi ; (Destination).Buffer = 0
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or edi, edi
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jz @f
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or ecx, -1
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xor eax, eax
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repne scasb
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not ecx
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mov [edx]+2, cx ; Save maximum length
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dec ecx
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mov [edx], cx ; Save length
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@@: pop edi
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stdRET _RtlInitString
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stdENDP _RtlInitString
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cPublicProc _RtlInitAnsiString ,2
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cPublicFpo 2,2
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push edi
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mov edi,[esp]+8+4 ; (edi)= SourceString
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mov edx,[esp]+4+4 ; (esi)= DestinationString
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mov DWORD PTR [edx], 0 ; (Destination).Length = (Destination).MaximumLength = 0
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mov DWORD PTR [edx]+4, edi ; (Destination).Buffer = 0
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or edi, edi
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jz @f
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or ecx, -1
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xor eax, eax
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repne scasb
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not ecx
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mov [edx]+2, cx ; Save maximum length
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dec ecx
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mov [edx], cx ; Save length
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@@: pop edi
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stdRET _RtlInitAnsiString
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stdENDP _RtlInitAnsiString
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page
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subttl "RtlInitAnsiString"
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; VOID
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; RtlInitAnsiString(
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; OUT PANSI_STRING DestinationString,
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; IN PSZ SourceString OPTIONAL
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; )
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; Routine Description:
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; The RtlInitUnicodeString function initializes an NT counted string.
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; The DestinationString is initialized to point to the SourceString
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; and the Length and MaximumLength fields of DestinationString are
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; initialized to the length of the SourceString, which is zero if
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; SourceString is not specified.
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; Arguments:
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; (TOS+4) = DestinationString - Pointer to the counted string to initialize
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; (TOS+8) = SourceString - Optional pointer to a null terminated string that
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; the counted string is to point to.
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; Return Value:
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; None.
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; NOTE:
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; This routine assumes that the string is less than 64K in size.
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cPublicProc _RtlInitUnicodeString ,2
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cPublicFpo 2,2
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push edi
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mov edi,[esp]+8+4 ; (edi)= SourceString
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mov edx,[esp]+4+4 ; (esi)= DestinationString
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mov DWORD PTR [edx], 0 ; (Destination).Length = (Destination).MaximumLength = 0
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mov DWORD PTR [edx]+4, edi ; (Destination).Buffer = 0
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or edi, edi
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jz @f
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or ecx, -1
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xor eax, eax
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repne scasw
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not ecx
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shl ecx,1
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mov [edx]+2, cx ; Save maximum length
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dec ecx
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dec ecx
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mov [edx], cx ; Save length
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@@: pop edi
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stdRET _RtlInitUnicodeString
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stdENDP _RtlInitUnicodeString
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_TEXT ends
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end
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