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| ****************************************************************************/ |
| |
| #include "qplatformdefs.h" |
| |
| #include "qbytearray.h" |
| #include "qstring.h" |
| |
| #include "string.h" |
| |
| QT_BEGIN_NAMESPACE |
| |
| #if !defined(QT_VSNPRINTF) || defined(Q_CLANG_QDOC) |
| |
| /*! |
| \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::asprintf() |
| instead. |
| |
| \sa qsnprintf(), QString::asprintf() |
| */ |
| |
| 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 |
| |
| /*! |
| \target bytearray-qsnprintf |
| \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::asprintf() to format a string instead. |
| |
| \sa qvsnprintf(), QString::asprintf() |
| */ |
| |
| 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 |