Substring Matching

NTFSD
1

Hi,
Sorry if this is too basics for you gurus , I am a starter.

I was querious why FsRtlIsDbcsInExpression is not giving TRUE and I do
not get success msg.

My intention here is too check for substring without using any C runtime
libararies functions like wstrstr().

PANSI_STRING myansistring;
ANSI_STRING File_Expression;

RtlInitAnsiString(&File_Expression,“\DEVICE\HARDDISKVOLUME1”);
DbgPrint(“\nContents of myansistring:%Z”,myansistring); \->
gives “\DEVICE\HARDDISKVOLUME1\Filename.text”

if ( TRUE==FsRtlIsDbcsInExpression( &File_Expression,
myansistring) )
{

DbgPrint("\nSuccess ");

}
Else
{
DbgPrint(“\nFailiure”);
}

Any suggestions will be very helpful.

Thanks & Regards,
Anurag

2

The language used for the pattern string must be in regular expression
format - add an ‘*’ and you will see a pattern match.

The RE language here has five match characters: * ? < > "

* = zero or more characters
? = one character
< = zero or more characters with DOS semantics

= one character with DOS semantics
" = dot character with DOS semantics

(Verify these last three in ntifs.h, but I believe I got them correct
here).

Regards,

Tony

Tony Mason
Consulting Partner
OSR Open Systems Resources Inc.
http://www.osr.com

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Anurag Sarin
Sent: Thursday, August 12, 2004 11:48 AM
To: ntfsd redirect
Subject: [ntfsd] Substring Matching

Hi,
Sorry if this is too basics for you gurus , I am a starter.

I was querious why FsRtlIsDbcsInExpression is not giving TRUE and I do
not get success msg.

My intention here is too check for substring without using any C runtime
libararies functions like wstrstr().

PANSI_STRING myansistring;
ANSI_STRING File_Expression;

RtlInitAnsiString(&File_Expression,“\DEVICE\HARDDISKVOLUME1”);
DbgPrint(“\nContents of myansistring:%Z”,myansistring); \->
gives “\DEVICE\HARDDISKVOLUME1\Filename.text”

if ( TRUE==FsRtlIsDbcsInExpression( &File_Expression,
myansistring) )
{

DbgPrint("\nSuccess ");

}
Else
{
DbgPrint(“\nFailiure”);
}

Any suggestions will be very helpful.

Thanks & Regards,
Anurag

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