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Diffstat (limited to 'src/corelib/tools/qvsnprintf.cpp')
-rw-r--r-- | src/corelib/tools/qvsnprintf.cpp | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/src/corelib/tools/qvsnprintf.cpp b/src/corelib/tools/qvsnprintf.cpp new file mode 100644 index 0000000..31b8632 --- /dev/null +++ b/src/corelib/tools/qvsnprintf.cpp @@ -0,0 +1,133 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the QtCore module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qplatformdefs.h" + +#include "qbytearray.h" +#include "qstring.h" + +#include "string.h" + +QT_BEGIN_NAMESPACE + +#ifndef QT_VSNPRINTF + +/*! + \relates QByteArray + + A portable \c vsnprintf() function. Will call \c ::vsnprintf(), \c + ::_vsnprintf(), or \c ::vsnprintf_s depending on the system, or + fall back to an internal version. + + \a fmt is the \c printf() format string. The result is put into + \a str, which is a buffer of at least \a n bytes. + + The caller is responsible to call \c va_end() on \a ap. + + \warning Since vsnprintf() shows different behavior on certain + platforms, you should not rely on the return value or on the fact + that you will always get a 0 terminated string back. + + Ideally, you should never call this function but use QString::sprintf() + instead. + + \sa qsnprintf(), QString::sprintf() +*/ + +int qvsnprintf(char *str, size_t n, const char *fmt, va_list ap) +{ + if (!str || !fmt) + return -1; + + QString buf; + buf.vsprintf(fmt, ap); + + QByteArray ba = buf.toLocal8Bit(); + + if (n > 0) { + size_t blen = qMin(size_t(ba.length()), size_t(n - 1)); + memcpy(str, ba.constData(), blen); + str[blen] = '\0'; // make sure str is always 0 terminated + } + + return ba.length(); +} + +#else + +QT_BEGIN_INCLUDE_NAMESPACE +#include <stdio.h> +QT_END_INCLUDE_NAMESPACE + +int qvsnprintf(char *str, size_t n, const char *fmt, va_list ap) +{ + return QT_VSNPRINTF(str, n, fmt, ap); +} + +#endif + +/*! + \relates QByteArray + + A portable snprintf() function, calls qvsnprintf. + + \a fmt is the \c printf() format string. The result is put into + \a str, which is a buffer of at least \a n bytes. + + \warning Call this function only when you know what you are doing + since it shows different behavior on certain platforms. + Use QString::sprintf() to format a string instead. + + \sa qvsnprintf(), QString::sprintf() +*/ + +int qsnprintf(char *str, size_t n, const char *fmt, ...) +{ + va_list ap; + va_start(ap, fmt); + + int ret = qvsnprintf(str, n, fmt, ap); + va_end(ap); + + return ret; +} + +QT_END_NAMESPACE |