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fputwc(3) — Linux manual page

NAME \|LIBRARY \|SYNOPSIS \|DESCRIPTION \|RETURN VALUE \|ERRORS \|ATTRIBUTES \|STANDARDS \|HISTORY \|NOTES \|SEE ALSO \|COLOPHON

fputwc(3)                Library Functions Manualfputwc(3)

NAME top

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

LIBRARY top

       Standard C library (libc,-lc)

SYNOPSIS top

#include <stdio.h>#include <wchar.h>wint_t fputwc(wchar_twc, FILE *stream);wint_t putwc(wchar_twc, FILE *stream);

DESCRIPTION top

       Thefputwc() function is the wide-character equivalent of thefputc(3) function.  It writes the wide characterwc tostream.  Ifferror(stream) becomes true, it returnsWEOF.  If a wide-character       conversion error occurs, it setserrno toEILSEQand returnsWEOF.       Otherwise, it returnswc.       Theputwc() function or macro functions identically tofputwc().       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, seeunlocked_stdio(3).

RETURN VALUE top

       On success,fputwc() function returnswc.  Otherwise,WEOFis       returned, anderrno is set to indicate the error.

ERRORS top

       Apart from the usual ones, there isEILSEQConversion ofwc to the stream's encoding fails.

ATTRIBUTES top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────────────┬───────────────┬─────────┐       │Interface│Attribute│Value│       ├──────────────────────────────────────┼───────────────┼─────────┤       │fputwc(),putwc()                    │ Thread safety │ MT-Safe │       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS top

       C11, POSIX.1-2008.

HISTORY top

       C99, POSIX.1-2001.

NOTES top

       The behavior offputwc() depends on theLC_CTYPEcategory of the       current locale.       In the absence of additional information passed to thefopen(3)       call, it is reasonable to expect thatfputwc() will actually write       the multibyte sequence corresponding to the wide characterwc.

COLOPHON top

       This page is part of theman-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 isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17fputwc(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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