qvsnprintf.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qplatformdefs.h"
 
#include "qbytearray.h"
#include "qstring.h"
 
#include "string.h"
 
QT_BEGIN_NAMESPACE
 
#if !defined(QT_VSNPRINTF) || defined(Q_QDOC)
 
int qvsnprintf(char *str, size_t n, const char *fmt, va_list ap)
{
    if (!str || !fmt)
        return -1;
 
    const QByteArray ba = QString::vasprintf(fmt, ap).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
 
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