FPUTWC(3)                                                               Linux Programmer's Manual                                                              FPUTWC(3)

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

SYNOPSIS
       #include <stdio.h>
       #include <wchar.h>

       wint_t fputwc(wchar_t wc, FILE *stream);
       wint_t putwc(wchar_t wc, FILE *stream);

DESCRIPTION
       The  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 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 nonlocking counterparts, see unlocked_stdio(3).

RETURN VALUE
       On success, fputwc() function returns wc.  Otherwise, WEOF is returned, and errno is set to indicate the error.

ERRORS
       Apart from the usual ones, there is

       EILSEQ Conversion of wc to the stream's encoding fails.

ATTRIBUTES
       For an explanation of the terms used in this section, see attributes(7).

       ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │Interface                                                                                                                             │ Attribute     │ Value   │
       ├──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │fputwc(), putwc()                                                                                                                     │ Thread safety │ MT-Safe │
       └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

CONFORMING TO
       POSIX.1-2001, POSIX.1-2008, C99.

NOTES
       The behavior of 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 fputwc() will actually write the multibyte sequence corre‐
       sponding to the wide character wc.

SEE ALSO
       fgetwc(3), fputws(3), unlocked_stdio(3)

GNU                                                                            2021-03-22                                                                      FPUTWC(3)