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Diffstat (limited to 'private/ntos/rtl/i386/stringsp.asm')
| -rw-r--r-- | private/ntos/rtl/i386/stringsp.asm | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/private/ntos/rtl/i386/stringsp.asm b/private/ntos/rtl/i386/stringsp.asm new file mode 100644 index 000000000..e722f1808 --- /dev/null +++ b/private/ntos/rtl/i386/stringsp.asm @@ -0,0 +1,175 @@ + 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 |