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42 #include "qplatformdefs.h"
44 #include "qbytearray.h"
56 A portable \c vsnprintf() function. Will call \c ::vsnprintf(), \c
57 ::_vsnprintf(), or \c ::vsnprintf_s depending on the system, or
58 fall back to an internal version.
60 \a fmt is the \c printf() format string. The result is put into
61 \a str, which is a buffer of at least \a n bytes.
63 The caller is responsible to call \c va_end() on \a ap.
65 \warning Since vsnprintf() shows different behavior on certain
66 platforms, you should not rely on the return value or on the fact
67 that you will always get a 0 terminated string back.
69 Ideally, you should never call this function but use QString::sprintf()
72 \sa qsnprintf(), QString::sprintf()
75 int qvsnprintf(char *str, size_t n, const char *fmt, va_list ap)
81 buf.vsprintf(fmt, ap);
83 QByteArray ba = buf.toLocal8Bit();
86 size_t blen = qMin(size_t(ba.length()), size_t(n - 1));
87 memcpy(str, ba.constData(), blen);
88 str[blen] = '\0'; // make sure str is always 0 terminated
96 QT_BEGIN_INCLUDE_NAMESPACE
98 QT_END_INCLUDE_NAMESPACE
100 int qvsnprintf(char *str, size_t n, const char *fmt, va_list ap)
102 return QT_VSNPRINTF(str, n, fmt, ap);
110 A portable snprintf() function, calls qvsnprintf.
112 \a fmt is the \c printf() format string. The result is put into
113 \a str, which is a buffer of at least \a n bytes.
115 \warning Call this function only when you know what you are doing
116 since it shows different behavior on certain platforms.
117 Use QString::sprintf() to format a string instead.
119 \sa qvsnprintf(), QString::sprintf()
122 int qsnprintf(char *str, size_t n, const char *fmt, ...)
127 int ret = qvsnprintf(str, n, fmt, ap);