Read a wide character from a stream
Synopsis:
#include <wchar.h>
wint_t getwc( FILE * fp );
Arguments:
- fp
- The stream from which you want to read a wide character.
Library:
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
Description:
The getwc() function reads the next wide character from the
specified stream.
Returns:
- If successful, getwc() returns the next character from fp,
cast as (wint_t)(wchar_t).
- If the end-of-file indicator for the stream is set or the stream is at the end of the file,
getwc() sets the end-of-file indicator and returns WEOF.
- If an error occurred, getwc() sets the error indicator for the stream, sets
errno,
and returns WEOF.
Note:
Use
feof()
or
ferror()
to distinguish an end-of-file condition from an error.
Errors:
- EAGAIN
- The O_NONBLOCK flag is set for fp and
would have been blocked by this operation.
- EBADF
- The fp stream isn't valid for reading.
- EINTR
- A signal terminated the read operation; no data was transferred.
- EIO
- Either a physical I/O error has occurred, or the process is in the background and is being ignored or blocked.
- EOVERFLOW
- Cannot read at or beyond the offset maximum for this stream.
Classification:
ANSI,
POSIX 1003.1
| Safety: |
|
|---|
| Cancellation point |
Yes |
| Interrupt handler |
No |
| Signal handler |
No |
| Thread |
Yes |