94 lines
2.2 KiB
C++
94 lines
2.2 KiB
C++
// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
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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_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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