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88 lines
3.7 KiB
C++
88 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* 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
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1994-2000
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* the Initial Developer. All Rights Reserved.
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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 terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsPrintfCString_h___
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#define nsPrintfCString_h___
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#ifndef nsString_h___
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#include "nsString.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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* CopyASCIItoUTF16(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 : public nsCString
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{
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typedef nsCString string_type;
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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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// XXX don't these need to be declared CDECL ??
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explicit nsPrintfCString( const char_type* format, ... );
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nsPrintfCString( size_type n, const char_type* format, ...);
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private:
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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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