vswprintf()
QNX SDP8.0C Library ReferenceAPIDeveloper
Write wide-character formatted output to a buffer (varargs)
Synopsis:
#include <wchar.h>
#include <stdarg.h>
int vswprintf( wchar_t * buf,
size_t n,
const wchar_t * format,
va_list arg );
Arguments:
- 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.
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
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().
Returns:
The number of wide characters written, excluding the terminating NUL, or a negative number if an error occurred (errno is set).
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Signal handler | Yes |
| Thread | Yes |
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