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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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fputwc(3) Library Functions Manual fputwc(3)
fputwc, putwc - write a wide character to a FILE stream
Standard C library (libc, -lc)
#include <stdio.h>
#include <wchar.h>
wint_t fputwc(wchar_t wc, FILE *stream);
wint_t putwc(wchar_t wc, FILE *stream);
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).
On success, fputwc() function returns wc. Otherwise, WEOF is
returned, and errno is set to indicate the error.
Apart from the usual ones, there is
EILSEQ Conversion of wc to the stream's encoding fails.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│ fputwc(), putwc() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
C11, POSIX.1-2008.
C99, POSIX.1-2001.
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 corresponding to the wide character wc.
fgetwc(3), fputws(3), unlocked_stdio(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 fputwc(3)
Pages that refer to this page: curs_add_wch(3x), fgetwc(3), fputws(3), printf(3), puts(3), putwchar(3), wchar_t(3type), wint_t(3type), wprintf(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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