The fgetws() function shall read characters from the stream,
convert these to the corresponding wide-character codes, place them in the
wchar_t array pointed to by ws, until n-1 characters are
read, or a <newline> is read, converted, and transferred to ws,
or an end-of-file condition is encountered. The wide-character string,
ws, shall then be terminated with a null wide-character code.
If an error occurs, the resulting value of the file position indicator for the
stream is unspecified.
The fgetws() function may mark the st_atime field of the file
associated with stream for update. The st_atime field shall be
marked for update by the first successful execution of fgetc(),
fgets(), fgetwc(), fgetws(), fread(),
fscanf(), getc(), getchar(), gets(), or
scanf() using stream that returns data not supplied by a prior
call to ungetc() or ungetwc().
Upon successful completion, fgetws() shall return ws. If the
stream is at end-of-file, the end-of-file indicator for the stream shall be
set and fgetws() shall return a null pointer. If a read error occurs,
the error indicator for the stream shall be set, fgetws() shall return
a null pointer, and shall set errno to indicate the error.
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html