130 lines
4.0 KiB
C++
130 lines
4.0 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qplatformdefs.h"
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#include "qbytearray.h"
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#include "qstring.h"
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#include "string.h"
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QT_BEGIN_NAMESPACE
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#if !defined(QT_VSNPRINTF) || defined(Q_CLANG_QDOC)
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/*!
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\relates QByteArray
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A portable \c vsnprintf() function. Will call \c ::vsnprintf(), \c
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::_vsnprintf(), or \c ::vsnprintf_s depending on the system, or
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fall back to an internal version.
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\a fmt is the \c printf() format string. The result is put into
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\a str, which is a buffer of at least \a n bytes.
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The caller is responsible to call \c va_end() on \a ap.
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\warning Since vsnprintf() shows different behavior on certain
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platforms, you should not rely on the return value or on the fact
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that you will always get a 0 terminated string back.
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Ideally, you should never call this function but use QString::asprintf()
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instead.
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\sa qsnprintf(), QString::asprintf()
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*/
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int qvsnprintf(char *str, size_t n, const char *fmt, va_list ap)
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{
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if (!str || !fmt)
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return -1;
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const QByteArray ba = QString::vasprintf(fmt, ap).toLocal8Bit();
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if (n > 0) {
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size_t blen = qMin(size_t(ba.length()), size_t(n - 1));
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memcpy(str, ba.constData(), blen);
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str[blen] = '\0'; // make sure str is always 0 terminated
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}
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return ba.length();
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}
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#else
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QT_BEGIN_INCLUDE_NAMESPACE
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#include <stdio.h>
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QT_END_INCLUDE_NAMESPACE
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int qvsnprintf(char *str, size_t n, const char *fmt, va_list ap)
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{
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return QT_VSNPRINTF(str, n, fmt, ap);
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}
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#endif
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/*!
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\target bytearray-qsnprintf
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\relates QByteArray
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A portable snprintf() function, calls qvsnprintf.
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\a fmt is the \c printf() format string. The result is put into
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\a str, which is a buffer of at least \a n bytes.
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\warning Call this function only when you know what you are doing
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since it shows different behavior on certain platforms.
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Use QString::asprintf() to format a string instead.
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\sa qvsnprintf(), QString::asprintf()
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*/
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int qsnprintf(char *str, size_t n, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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int ret = qvsnprintf(str, n, fmt, ap);
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va_end(ap);
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return ret;
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}
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QT_END_NAMESPACE
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