putwc(3) -- Linux man page
NAMEfputwc - write a wide character to a FILE stream
#include <wchar.h> wint_t fputwc(wchar_t wc, FILE *stream); wint_t putwc(wchar_t wc, FILE *stream);
DESCRIPTIONThe fputwc function is the wide-character equivalent of the fputc 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 putwc function or macro functions identically to 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).
RETURN VALUEThe fputwc function returns wc if no error occurred, or WEOF to indicate an error.
ERRORSApart from the usual ones, there is
- Conversion of wc to the stream's encoding fails.
CONFORMING TOISO/ANSI C, UNIX98
NOTESThe behaviour of fputwc depends on the LC_CTYPE category of the current locale.
SEE ALSOfgetwc(3), fputws(3), unlocked_stdio(3)