vfwscanf()
QNX SDP8.0C Library ReferenceAPIDeveloper
Scan input from a file (varargs)
Synopsis:
#include <wchar.h>
#include <stdarg.h>
int vfwscanf( FILE * fp,
const wchar_t *format,
va_list arg );
Arguments:
- fp
- The stream that you want to read from.
- format
- A wide-character string that specifies the format of the input. For more information, see scanf(). The formatting string determines what additional arguments you need to provide.
- 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 vfwscanf() function scans input from the file designated by fp, under control of the argument format.
The vfwscanf() function is the wide-character version of
vfscanf(),
and is a varargs
version of
fwscanf().
Note:
The vfwscanf() function is generally considered unsafe for string handling;
it's safer to use
fgetws()
to get a line of input and then use
vswscanf()
to process the input.
Returns:
The number of input arguments for which values were successfully scanned and stored, or EOF if the scanning reached the end of the input stream before storing any values.
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Signal handler | No |
| Thread | Yes |
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