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