mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-05 16:46:26 +00:00
94 lines
3.8 KiB
C++
Executable File
94 lines
3.8 KiB
C++
Executable File
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/*
|
|
* The contents of this file are subject to the Mozilla Public
|
|
* License Version 1.1 (the "License"); you may not use this file
|
|
* except in compliance with the License. You may obtain a copy of
|
|
* the License at http://www.mozilla.org/MPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS
|
|
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
|
|
* implied. See the License for the specific language governing
|
|
* rights and limitations under the License.
|
|
*
|
|
* The Original Code is mozilla.org code.
|
|
*
|
|
* The Initial Developer of the Original Code is Netscape
|
|
* Communications Corporation. Portions created by Netscape are
|
|
* Copyright (C) 1994-2000 Netscape Communications Corporation. All
|
|
* Rights Reserved.
|
|
*
|
|
* Original Author:
|
|
* Scott Collins <scc@mozilla.org>
|
|
*
|
|
* Contributor(s):
|
|
*
|
|
* Alternatively, the contents of this file may be used under the
|
|
* terms of the GNU General Public License Version 2 or later (the
|
|
* "GPL"), in which case the provisions of the GPL are applicable
|
|
* instead of those above. If you wish to allow use of your
|
|
* version of this file only under the terms of the GPL and not to
|
|
* allow others to use your version of this file under the MPL,
|
|
* indicate your decision by deleting the provisions above and
|
|
* replace them with the notice and other provisions required by
|
|
* the GPL. If you do not delete the provisions above, a recipient
|
|
* may use your version of this file under either the MPL or the
|
|
* GPL.
|
|
*/
|
|
|
|
#ifndef nsPrintfCString_h___
|
|
#define nsPrintfCString_h___
|
|
|
|
#include "nsAWritableString.h"
|
|
|
|
|
|
/**
|
|
* |nsPrintfCString| lets you use a formated |printf| string as an |nsAReadableCString|.
|
|
*
|
|
* myCStr += nsPrintfCString("%f", 13.917);
|
|
* // ...a general purpose substitute for |AppendFloat|
|
|
*
|
|
* For longer patterns, you'll want to use the constructor that takes a length
|
|
*
|
|
* nsPrintfCString(128, "%f, %f, %f, %f, %f, %f, %f, %i, %f", x, y, z, 3.2, j, k, l, 3, 3.1);
|
|
*
|
|
* Exceding the default size (which you must specify in the constructor, it is not determined)
|
|
* causes an allocation, so avoid that. If your formatted string exceeds the allocated space, it is
|
|
* cut off at the size of the buffer, no error is reported (and no out-of-bounds writing occurs).
|
|
* This class is intended to be useful for numbers and short
|
|
* strings, not arbitrary formatting of other strings (e.g., with %s). There is currently no
|
|
* wide version of this class, since wide |printf| is not generally available. That means
|
|
* to get a wide version of your formatted data, you must, e.g.,
|
|
*
|
|
* CopyASCIItoUCS2(nsPrintfCString("%f", 13.917"), myStr);
|
|
*
|
|
* That's another good reason to avoid this class for anything but numbers ... as strings can be
|
|
* much more efficiently handled with |NS_LITERAL_[C]STRING| and |nsLiteral[C]String|.
|
|
*/
|
|
|
|
class nsPrintfCString
|
|
: public nsAReadableCString
|
|
{
|
|
enum { kLocalBufferSize=15 };
|
|
// ought to be large enough for most things ... a |long long| needs at most 20 (so you'd better ask)
|
|
// pinkerton suggests 7. We should measure and decide what's appropriate
|
|
|
|
|
|
public:
|
|
explicit nsPrintfCString( const char* format, ... );
|
|
nsPrintfCString( size_t n, const char* format, ...);
|
|
~nsPrintfCString();
|
|
|
|
virtual PRUint32 Length() const;
|
|
|
|
protected:
|
|
virtual const char* GetReadableFragment( nsReadableFragment<char>& aFragment, nsFragmentRequest aRequest, PRUint32 aOffset ) const;
|
|
// virtual PRBool GetReadableFragment( nsReadableFragment<char>& aFragment, nsFragmentRequest aRequest ) const;
|
|
|
|
private:
|
|
char* mStart;
|
|
PRUint32 mLength;
|
|
char mLocalBuffer[ kLocalBufferSize + 1 ];
|
|
};
|
|
|
|
#endif // !defined(nsPrintfCString_h___)
|