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Write wide-character formatted output to a buffer (varargs)
#include <wchar.h>
#include <stdarg.h>
int vswprintf( wchar_t * buf,
size_t n,
const wchar_t * format,
va_list arg );
- buf
- A pointer to the buffer where you want to function to store the formatted
string.
- n
- The maximum number of wide characters to store in the buffer, including
a terminating null character.
- format
- A wide-character string that specifies the format of the output.
The formatting string determines what additional arguments you need to
provide.
For more information, see
printf().
- arg
- A variable-argument list of the additional arguments, which you
must have initialized with the
va_start()
macro.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The vswprintf() function formats data under control of the
format control string, and writes the result to buf.
The vswprint() function is the wide-character version of
vsprintf(),
and is a “varargs” version of
swprintf().
The number of wide characters written, excluding the terminating
NUL, or a negative number if an error occurred
(errno
is set).
ANSI,
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Read the Caveats |
Thread |
Yes |
It's safe to call vswprintf() in a signal
handler if the data isn't floating point.
fprintf(),
fwprintf(),
printf(),
snprintf(),
sprintf(),
swprintf(),
va_start(),
vfprintf(),
vfwprintf(),
vprintf(),
vsnprintf(),
vsprintf(),
vwprintf(),
wprintf()
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