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FsRtlIsHpfsDbcsLegal function (ntifs.h)

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The FsRtlIsHpfsDbcsLegal routine determines whether the specified ANSI or double-byte character set (DBCS) string is a legal HPFS file name.

Syntax

BOOLEAN FsRtlIsHpfsDbcsLegal(
  [in] ANSI_STRING DbcsName,
  [in] BOOLEAN     WildCardsPermissible,
  [in] BOOLEAN     PathNamePermissible,
  [in] BOOLEAN     LeadingBackslashPermissible
);

Parameters

[in] DbcsName

A pointer to the string to be tested.

[in] WildCardsPermissible

Set to TRUE if wildcard characters are to be considered legal, FALSE otherwise.

[in] PathNamePermissible

Set to TRUE if DbcsName can be a full pathname containing backslash characters, FALSE if it can only be a file name.

[in] LeadingBackslashPermissible

Set to TRUE if a single leading backslash is permissible in the file or pathname, FALSE otherwise.

Return value

The FsRtlIsHpfsDbcsLegal routine returns TRUE if the string is a legal HPFS file name, FALSE otherwise.

Remarks

The FsRtlIsHpfsDbcsLegal routine determines whether the specified file name conforms to the HPFS-specific rules for legal file names. This routine will check the file name or, if PathNamePermissible is specified as TRUE, whether the whole pathname is a legal HPFS name.

HPFS file names must obey the following rules:

  • The following characters are illegal in HPFS file names: 0x0000 - 0x001F, " (quotation marks), / (slash), : (colon), < (less-than sign), > (greater-than sign), ? (question mark), | (vertical bar or pipe), * (asterisk)

  • An HPFS file name cannot end in a period or a space. For example, the files "foo " and "foo." are illegal, while ".foo", " foo" and "foo.bar.foo" are legal.

  • An HPFS file name can contain no more than 255 bytes.

  • HPFS file names are case-preserving, but not case insensitive. Lowercase file names are not automatically converted to uppercase. However, case is ignored in file name comparisons.

Requirements

Requirement Value
Minimum supported client Windows 2000
Target Platform Universal
Header ntifs.h (include FltKernel.h, Ntifs.h)
Library NtosKrnl.lib
DLL NtosKrnl.exe
IRQL <= APC_LEVEL

See also

ANSI_STRING