fgetws()

Read a string of wide characters from a stream

Synopsis:

#include <wchar.h>

wchar_t * fgetws( wchar_t * buf, 
                  int n, 
                  FILE * fp );

Arguments:

buf

A pointer to a buffer in which fgetws() can store the wide characters that it reads.

n

The maximum number of characters to read.

fp

The stream from which to read the characters.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The fgetws() function reads a string of wide characters from the stream specified by fp, and stores them in the array specified by buf.

It stops reading wide characters when one of the following occurs:

• The end-of-file is reached.
• A newline ('\n') character is read.
• n-1 characters have been read.

The fgetws() function places a NUL at the end of the string.

---

Don't assume all strings have newline characters. A newline character isn't present when more than n-1 characters occur before the newline. Also, a newline character might not appear as the last character in a file when the end-of-file is reached.

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Returns:

NULL

Failure; the stream is at the end-of-file or an error occurred (errno is set).

buf

Success.

---

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 file descriptor for fp 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

See also:

errno, feof(), ferror(), fgets(), fputwc(), fputws(), fwide(), gets()