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96 lines
3.8 KiB
C++
Executable File
96 lines
3.8 KiB
C++
Executable File
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1994-2000 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Original Author:
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* Scott Collins <scc@mozilla.org>
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU General Public License Version 2 or later (the
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* "GPL"), in which case the provisions of the GPL are applicable
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* instead of those above. If you wish to allow use of your
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* version of this file only under the terms of the GPL and not to
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* allow others to use your version of this file under the MPL,
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* indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by
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* the GPL. If you do not delete the provisions above, a recipient
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* may use your version of this file under either the MPL or the
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* GPL.
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*/
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#ifndef nsPrintfCString_h___
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#define nsPrintfCString_h___
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#ifndef nsAFlatString_h___
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#include "nsAFlatString.h"
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#endif
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/**
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* |nsPrintfCString| lets you use a formated |printf| string as an |const nsACString|.
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*
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* myCStr += nsPrintfCString("%f", 13.917);
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* // ...a general purpose substitute for |AppendFloat|
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*
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* For longer patterns, you'll want to use the constructor that takes a length
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*
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* nsPrintfCString(128, "%f, %f, %f, %f, %f, %f, %f, %i, %f", x, y, z, 3.2, j, k, l, 3, 3.1);
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*
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* Exceding the default size (which you must specify in the constructor, it is not determined)
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* causes an allocation, so avoid that. If your formatted string exceeds the allocated space, it is
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* cut off at the size of the buffer, no error is reported (and no out-of-bounds writing occurs).
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* This class is intended to be useful for numbers and short
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* strings, not arbitrary formatting of other strings (e.g., with %s). There is currently no
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* wide version of this class, since wide |printf| is not generally available. That means
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* to get a wide version of your formatted data, you must, e.g.,
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*
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* CopyASCIItoUCS2(nsPrintfCString("%f", 13.917"), myStr);
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*
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* That's another good reason to avoid this class for anything but numbers ... as strings can be
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* much more efficiently handled with |NS_LITERAL_[C]STRING| and |nsLiteral[C]String|.
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*/
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class NS_COM nsPrintfCString
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: public nsAFlatCString
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{
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enum { kLocalBufferSize=15 };
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// ought to be large enough for most things ... a |long long| needs at most 20 (so you'd better ask)
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// pinkerton suggests 7. We should measure and decide what's appropriate
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public:
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explicit nsPrintfCString( const char_type* format, ... );
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nsPrintfCString( size_t n, const char_type* format, ...);
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~nsPrintfCString();
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virtual PRUint32 Length() const;
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protected:
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virtual const char_type* GetReadableFragment( const_fragment_type&, nsFragmentRequest, PRUint32 ) const;
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virtual char_type* GetWritableFragment( fragment_type&, nsFragmentRequest, PRUint32 ) { return 0; }
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private:
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char_type* mStart;
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PRUint32 mLength;
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char_type mLocalBuffer[ kLocalBufferSize + 1 ];
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};
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#endif // !defined(nsPrintfCString_h___)
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