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PUTWC(3) Library Functions Manual PUTWC(3)

fputwc, putwc, putwchar
output a wide character to a stream

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

The fputwc() function writes the wide character wc to the output stream pointed to by stream.
putwc() acts essentially identically to fputwc(), but is a macro that expands in-line. It may evaluate stream more than once, so arguments given to putwc() should not be expressions with potential side effects.
putwchar() is identical to putwc() with an output stream of stdout.

The functions, fputwc(), putwc() and putwchar() return the wide character written. If an error occurs, the value WEOF is returned.

ferror(3), fopen(3), getwc(3), putc(3), stdio(3)

The functions fputwc(), putwc(), and putwchar(), conform to ISO/IEC 9899:1999 (“ISO C99”).
December 1, 2017 OpenBSD-current