633 lines
10 KiB
C++
633 lines
10 KiB
C++
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/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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SUB_STRING
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Abstract:
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This module contains the definition of the SUB_STRING class.
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Author:
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Steve Rowe (stever)
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Environment:
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ULIB, User Mode
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Notes:
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A substring is a subsequence of characters taken from a "base"
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string. Substrings are useful in those cases in which we want
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to operate on "chunks" of a given string (e.g. parsing), without
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having to create separate strings for each one.
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One must be careful when using substrings, though. Since
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substrings depend on a base string, the base string must exist
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during the life span of all its substrings. In other words,
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the base string must not be deleted before having deleted all
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the substrings obtained from it.
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Note that GENERIC_STRINGs have no substring support. It is up to
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the derived string classes to provide it.
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Since substrings are just "windows" into a base string, any
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modification of a substring will be reflected in the base
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string (hence in all other substrings). This is why we have
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two classes of substrings:
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SUB_STRING allows only read operations. Note however that
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one can modify the base string directly.
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DYNAMIC_SUB_STRING is derived from the above, and it allows
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write operations. Needless to say, you should
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not use this class unless you're sure of what
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you are doing.
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Substring objects cannot be created and initialized directly by the
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user, they must be obtained thru a base string class with substring
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support.
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Substrings pertaining to the same base string are chained together
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in a doubly-linked queue. Since substrings have no knowledge of the
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internals of their base string, the chain has a dummy element as its
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head. In order to provide substring support, the base string must
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follow these steps:
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1.- Before spawning any substring, the substring chain head must
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be created and initialized using the InitializeChainHead() method.
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Note that this substring is a dummy one, beknown only to the base
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string.
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2.- Whenever spawning a new substring, it must be linked to the chain
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using the InitializeChainNode() method. Any substring already in
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the chain may be use as argument, but the obvious choice is the
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chain head.
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3.- Each time that the size of the string changes, the Update() of the
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chain head must be invoked.
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4.- Before destroying a base string, you have to make sure that all its
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substrings have gone away. This means that the chain head must be
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the only element of the chain. Use the HasLinks() method to
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verify this.
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5.- Don't forget to destroy the chain head before destorying the base
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string.
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--*/
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//
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// This class is no longer supported
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//
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#include "wstring.hxx"
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#define _SUB_STRING_
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#if !defined (_SUB_STRING_)
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#define _SUB_STRING_
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#include "string.hxx"
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DECLARE_CLASS( SUB_STRING );
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class SUB_STRING : public GENERIC_STRING {
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friend SUB_STRING;
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public:
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DECLARE_CONSTRUCTOR( SUB_STRING );
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DECLARE_CAST_MEMBER_FUNCTION( SUB_STRING );
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VIRTUAL
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~SUB_STRING (
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);
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NONVIRTUAL
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BOOLEAN
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HasLinks (
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);
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NONVIRTUAL
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BOOLEAN
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InitializeChainHead (
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IN PGENERIC_STRING BaseString
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);
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NONVIRTUAL
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BOOLEAN
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InitializeChainNode (
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IN OUT PSUB_STRING SubString,
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IN CHNUM Position,
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IN CHNUM Length
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);
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VIRTUAL
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PBYTE
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GetInternalBuffer (
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IN CHNUM Position DEFAULT 0
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) CONST;
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VIRTUAL
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BOOLEAN
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IsChAt (
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IN WCHAR Char,
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IN CHNUM Position DEFAULT 0
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) CONST;
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VIRTUAL
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BOOLEAN
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MakeNumber (
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OUT PLONG Number,
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IN CHNUM Position DEFAULT 0,
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IN CHNUM Length DEFAULT TO_END
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) CONST;
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VIRTUAL
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ULONG
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QueryByteCount (
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IN CHNUM Position DEFAULT 0,
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IN CHNUM Length DEFAULT TO_END
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) CONST;
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VIRTUAL
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WCHAR
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QueryChAt(
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IN CHNUM Position DEFAULT 0
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) CONST;
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VIRTUAL
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CHNUM
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QueryChCount (
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) CONST;
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VIRTUAL
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PGENERIC_STRING
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QueryGenericString (
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IN CHNUM Position DEFAULT 0,
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IN CHNUM Length DEFAULT TO_END
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) CONST;
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VIRTUAL
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PSTR
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QuerySTR(
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IN CHNUM Position DEFAULT 0,
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IN CHNUM Length DEFAULT TO_END,
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IN OUT PSTR Buffer DEFAULT NULL,
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IN ULONG BufferSize DEFAULT 0
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) CONST;
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VIRTUAL
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PSUB_STRING
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QuerySubString (
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IN CHNUM Position DEFAULT 0,
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IN CHNUM Length DEFAULT TO_END,
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OUT PSUB_STRING SubString DEFAULT NULL
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);
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VIRTUAL
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PWSTR
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QueryWSTR (
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IN CHNUM Position DEFAULT 0,
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IN CHNUM Length DEFAULT TO_END,
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IN OUT PWSTR Buffer DEFAULT NULL,
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IN ULONG BufferSize DEFAULT 0,
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IN BOOLEAN ForceNull DEFAULT TRUE
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) CONST;
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VIRTUAL
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BOOLEAN
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Replace (
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IN PCGENERIC_STRING String2,
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IN CHNUM Position DEFAULT 0,
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IN CHNUM Length DEFAULT TO_END,
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IN CHNUM Position2 DEFAULT 0,
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IN CHNUM Length2 DEFAULT TO_END
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);
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VIRTUAL
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BOOLEAN
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SetChAt (
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IN WCHAR Char,
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IN CHNUM Position DEFAULT 0,
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IN CHNUM Length DEFAULT TO_END
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);
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VIRTUAL
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CHNUM
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Strchr (
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IN WCHAR Char,
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IN CHNUM Position DEFAULT 0,
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IN CHNUM Length DEFAULT TO_END
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) CONST;
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VIRTUAL
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LONG
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Strcmp (
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IN PCGENERIC_STRING GenericString
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) CONST;
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VIRTUAL
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CHNUM
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Strcspn (
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IN PCGENERIC_STRING GenericString,
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IN CHNUM Position DEFAULT 0,
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IN CHNUM Length DEFAULT TO_END
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) CONST;
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VIRTUAL
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LONG
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Stricmp (
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IN PCGENERIC_STRING GenericString
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) CONST;
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VIRTUAL
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LONG
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StringCompare (
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IN CHNUM Position1,
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IN CHNUM Length1,
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IN PCGENERIC_STRING GenericString2,
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IN CHNUM Position2,
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IN CHNUM Length2,
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IN USHORT CompareFlags DEFAULT COMPARE_IGNORECASE
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) CONST;
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VIRTUAL
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CHNUM
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StrLen (
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) CONST;
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VIRTUAL
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CHNUM
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Strrchr (
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IN WCHAR Char,
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IN CHNUM Position DEFAULT 0,
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IN CHNUM Length DEFAULT TO_END
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) CONST;
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VIRTUAL
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CHNUM
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Strspn (
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IN PCGENERIC_STRING GenericString,
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IN CHNUM Position DEFAULT 0,
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IN CHNUM Length DEFAULT TO_END
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) CONST;
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VIRTUAL
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CHNUM
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Strstr (
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IN PCGENERIC_STRING GenericString,
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IN CHNUM Position DEFAULT 0,
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IN CHNUM Length DEFAULT TO_END
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) CONST;
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NONVIRTUAL
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BOOLEAN
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Update (
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IN CHNUM Length
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);
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protected:
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NONVIRTUAL
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PGENERIC_STRING
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GetBaseString (
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);
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NONVIRTUAL
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PSUB_STRING
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GetNextInChain (
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);
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NONVIRTUAL
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PSUB_STRING
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GetPreviousInChain (
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);
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NONVIRTUAL
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VOID
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GetValidLength(
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IN CHNUM Position,
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IN OUT PCHNUM Length
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) CONST;
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NONVIRTUAL
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CHNUM
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QueryStartingPosition (
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) CONST;
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NONVIRTUAL
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VOID
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SetChCount(
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IN CHNUM NewCount
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);
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private:
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NONVIRTUAL
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VOID
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Construct (
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);
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NONVIRTUAL
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VOID
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Destroy (
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);
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PGENERIC_STRING _BaseString; // base string to take substring
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CHNUM _StartingPosition; // starting index within base
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CHNUM _CountOfChars; // # of chars in substring
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PSUB_STRING _Previous; // Previous in chain
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PSUB_STRING _Next; // Next in chain
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#if DBG==1
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ULONG _Signature;
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BOOLEAN _Initialized;
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#endif
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};
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INLINE
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PGENERIC_STRING
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SUB_STRING::GetBaseString (
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)
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/*++
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Routine Description:
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Gets a pointer to the base string
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Arguments:
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none
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Return Value:
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Pointer to the base string
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--*/
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{
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DebugAssert( _Initialized );
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return _BaseString;
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}
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INLINE
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PSUB_STRING
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SUB_STRING::GetNextInChain (
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)
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/*++
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Routine Description:
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Gets a pointer to next substring in the chain
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Arguments:
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none
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Return Value:
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Pointer to substring
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--*/
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{
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DebugAssert( _Initialized );
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return _Next;
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}
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INLINE
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PSUB_STRING
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SUB_STRING::GetPreviousInChain (
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)
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/*++
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Routine Description:
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Gets a pointer to previous substring in the chain
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Arguments:
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none
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Return Value:
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Pointer to the previous substring
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--*/
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{
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DebugAssert( _Initialized );
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return _Previous;
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}
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INLINE
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VOID
|
|||
|
|
SUB_STRING::GetValidLength (
|
|||
|
|
IN CHNUM Position,
|
|||
|
|
IN OUT PCHNUM Length
|
|||
|
|
) CONST
|
|||
|
|
|
|||
|
|
/*++
|
|||
|
|
|
|||
|
|
Routine Description:
|
|||
|
|
|
|||
|
|
If the length passed has the magic value TO_END, then it is
|
|||
|
|
updated to be the from the passed position up to the end of the
|
|||
|
|
substring.
|
|||
|
|
|
|||
|
|
Arguments:
|
|||
|
|
|
|||
|
|
Position - Supplies a starting position within the substring
|
|||
|
|
Length - Supplies a length
|
|||
|
|
|
|||
|
|
Return Value:
|
|||
|
|
|
|||
|
|
none
|
|||
|
|
|
|||
|
|
--*/
|
|||
|
|
|
|||
|
|
{
|
|||
|
|
|
|||
|
|
DebugAssert(_Initialized );
|
|||
|
|
|
|||
|
|
DebugAssert( Position <= _CountOfChars );
|
|||
|
|
|
|||
|
|
if ( *Length == TO_END ) {
|
|||
|
|
*Length = _CountOfChars - Position;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
DebugAssert( Position + *Length <= _CountOfChars );
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
INLINE
|
|||
|
|
BOOLEAN
|
|||
|
|
SUB_STRING::HasLinks (
|
|||
|
|
)
|
|||
|
|
|
|||
|
|
/*++
|
|||
|
|
|
|||
|
|
Routine Description:
|
|||
|
|
|
|||
|
|
Determines if the substring has forward and backward links
|
|||
|
|
|
|||
|
|
Arguments:
|
|||
|
|
|
|||
|
|
none
|
|||
|
|
|
|||
|
|
Return Value:
|
|||
|
|
|
|||
|
|
TRUE if the stubstring has forward or backward links
|
|||
|
|
FALSE otherwise
|
|||
|
|
|
|||
|
|
--*/
|
|||
|
|
|
|||
|
|
{
|
|||
|
|
DebugAssert( _Initialized );
|
|||
|
|
return ( (GetNextInChain() != NULL ) || (GetPreviousInChain() != NULL ) );
|
|||
|
|
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
INLINE
|
|||
|
|
CHNUM
|
|||
|
|
SUB_STRING::QueryStartingPosition (
|
|||
|
|
) CONST
|
|||
|
|
|
|||
|
|
/*++
|
|||
|
|
|
|||
|
|
Routine Description:
|
|||
|
|
|
|||
|
|
Returns the starting character position within the base string.
|
|||
|
|
|
|||
|
|
Arguments:
|
|||
|
|
|
|||
|
|
None.
|
|||
|
|
|
|||
|
|
Return Value:
|
|||
|
|
|
|||
|
|
The starting character position within the base string.
|
|||
|
|
|
|||
|
|
--*/
|
|||
|
|
|
|||
|
|
{
|
|||
|
|
DebugAssert( _Initialized );
|
|||
|
|
return _StartingPosition;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
INLINE
|
|||
|
|
VOID
|
|||
|
|
SUB_STRING::SetChCount (
|
|||
|
|
IN CHNUM NewCount
|
|||
|
|
)
|
|||
|
|
|
|||
|
|
/*++
|
|||
|
|
|
|||
|
|
Routine Description:
|
|||
|
|
|
|||
|
|
Sets the number of characters in the substring
|
|||
|
|
|
|||
|
|
Arguments:
|
|||
|
|
|
|||
|
|
NewCount - Supplies the new count of characters
|
|||
|
|
|
|||
|
|
Return Value:
|
|||
|
|
|
|||
|
|
none
|
|||
|
|
|
|||
|
|
--*/
|
|||
|
|
|
|||
|
|
{
|
|||
|
|
DebugAssert( _Initialized );
|
|||
|
|
_CountOfChars = NewCount;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
#endif // _SUB_STRING_
|
|||
|
|
|
|||
|
|
/*++
|
|||
|
|
|
|||
|
|
Copyright (c) 1990 Microsoft Corporation
|
|||
|
|
|
|||
|
|
Module Name:
|
|||
|
|
|
|||
|
|
DYNAMIC_SUB_STRING
|
|||
|
|
|
|||
|
|
Abstract:
|
|||
|
|
|
|||
|
|
This module contains the definition of the DYNAMIC_SUB_STRING class.
|
|||
|
|
|
|||
|
|
Author:
|
|||
|
|
|
|||
|
|
steve rowe stever 2/1/91
|
|||
|
|
|
|||
|
|
Notes:
|
|||
|
|
|
|||
|
|
DYNAMIC_SUB_STRINGs can modify the base string (see notes for
|
|||
|
|
SUB_STRING class).
|
|||
|
|
|
|||
|
|
|
|||
|
|
Revision History:
|
|||
|
|
|
|||
|
|
--*/
|
|||
|
|
|
|||
|
|
#define _DYNAMIC_SUB_STRING_
|
|||
|
|
|
|||
|
|
#if !defined (_DYNAMIC_SUB_STRING_)
|
|||
|
|
|
|||
|
|
#define _DYNAMIC_SUB_STRING_
|
|||
|
|
|
|||
|
|
DECLARE_CLASS( DYNAMIC_SUB_STRING );
|
|||
|
|
|
|||
|
|
class DYNAMIC_SUB_STRING : public SUB_STRING {
|
|||
|
|
|
|||
|
|
public:
|
|||
|
|
|
|||
|
|
DECLARE_CONSTRUCTOR( DYNAMIC_SUB_STRING );
|
|||
|
|
DECLARE_CAST_MEMBER_FUNCTION( DYNAMIC_SUB_STRING );
|
|||
|
|
|
|||
|
|
NONVIRTUAL
|
|||
|
|
BOOLEAN
|
|||
|
|
Copy (
|
|||
|
|
IN PCGENERIC_STRING GenericString
|
|||
|
|
);
|
|||
|
|
|
|||
|
|
VIRTUAL
|
|||
|
|
BOOLEAN
|
|||
|
|
SetChAt (
|
|||
|
|
IN WCHAR Char,
|
|||
|
|
IN CHNUM Position DEFAULT 0,
|
|||
|
|
IN CHNUM Length DEFAULT TO_END
|
|||
|
|
);
|
|||
|
|
|
|||
|
|
NONVIRTUAL
|
|||
|
|
CHNUM
|
|||
|
|
Truncate (
|
|||
|
|
IN CHNUM Position DEFAULT 0
|
|||
|
|
);
|
|||
|
|
|
|||
|
|
private:
|
|||
|
|
|
|||
|
|
VOID
|
|||
|
|
Construct (
|
|||
|
|
);
|
|||
|
|
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
|
|||
|
|
#endif // _DYNAMIC_SUB_STRING_
|