gecko-dev/xpcom/ds/nsPrintfCString.cpp

136 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.
*/
#include "nsPrintfCString.h"
#include <stdarg.h>
#include "prprf.h"
nsPrintfCString::nsPrintfCString( const char* format, ... )
: mStart(mLocalBuffer),
mLength(0)
{
va_list ap;
size_t logical_capacity = kLocalBufferSize;
size_t physical_capacity = logical_capacity + 1;
va_start(ap, format);
mLength = PR_vsnprintf(mStart, physical_capacity, format, ap);
va_end(ap);
}
nsPrintfCString::nsPrintfCString( size_t n, const char* format, ... )
: mStart(mLocalBuffer),
mLength(0)
{
va_list ap;
// make sure there's at least |n| space
size_t logical_capacity = kLocalBufferSize;
if ( n > logical_capacity )
{
char* nonlocal_buffer = new char[n];
// if we got something, use it
if ( nonlocal_buffer )
{
mStart = nonlocal_buffer;
logical_capacity = n;
}
// else, it's the error case ... we'll use what space we have
// (since we can't throw)
}
size_t physical_capacity = logical_capacity + 1;
va_start(ap, format);
mLength = PR_vsnprintf(mStart, physical_capacity, format, ap);
va_end(ap);
}
nsPrintfCString::~nsPrintfCString()
{
if ( mStart != mLocalBuffer )
delete [] mStart;
}
PRUint32
nsPrintfCString::Length() const
{
return mLength;
}
#if 0
PRBool
nsPrintfCString::GetReadableFragment( nsReadableFragment<char>& aFragment, nsFragmentRequest aRequest ) const
{
switch ( aRequest )
{
case kFirstFragment:
case kLastFragment:
aFragment.mFragmentIdentifier = this;
// fall through
case kThisFragment:
aFragment.mStart = mStart;
aFragment.mEnd = mStart + mLength;
return PR_TRUE;
default:
return PR_FALSE;
}
}
#else
const char*
nsPrintfCString::GetReadableFragment( nsReadableFragment<char>& aFragment, nsFragmentRequest aRequest, PRUint32 aOffset ) const
{
switch ( aRequest )
{
case kFirstFragment:
case kLastFragment:
case kFragmentAt:
aFragment.mEnd = (aFragment.mStart = mStart) + mLength;
return mStart + aOffset;
case kPrevFragment:
case kNextFragment:
default:
return 0;
}
}
#endif