fputwc, putwc - write a wide character to a FILE stream

#include <stdio.h>

#include <wchar.h>
 I wint_t fputwc(wchar_t  wc , FILE * stream );
I wint_t putwc(wchar_t  wc , FILE * stream );

The R fputwc () function is the wide-character equivalent of the fputc(3) function. It writes the wide character wc to stream. If ferror(stream) becomes true, it returns WEOF. If a wide-character conversion error occurs, it sets errno to EILSEQ and returns WEOF. Otherwise it returns wc.

The R putwc () function or macro functions identically to R fputwc (). It may be implemented as a macro, and may evaluate its argument more than once. There is no reason ever to use it.

For non-locking counterparts, see unlocked_stdio(3).

The R fputwc () function returns wc if no error occurred, or WEOF to indicate an error.

Apart from the usual ones, there is

EILSEQ

C99, POSIX.1-2001.

The behavior of R fputwc () depends on the LC_CTYPE category of the current locale.

In the absence of additional information passed to the fopen(3) call, it is reasonable to expect that R fputwc () will actually write the multibyte sequence corresponding to the wide character wc.

fgetwc(3), fputws(3), unlocked_stdio(3)