getwc()

QNX SDP8.0C Library ReferenceAPIDeveloper

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 pointYes
Signal handlerNo
ThreadYes
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