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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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ungetwc(3) Library Functions Manual ungetwc(3)
ungetwc - push back a wide character onto a FILE stream
Standard C library (libc, -lc)
#include <wchar.h>
wint_t ungetwc(wint_t wc, FILE *stream);
The ungetwc() function is the wide-character equivalent of the
ungetc(3) function. It pushes back a wide character onto stream
and returns it.
If wc is WEOF, it returns WEOF. If wc is an invalid wide
character, it sets errno to EILSEQ and returns WEOF.
If wc is a valid wide character, it is pushed back onto the stream
and thus becomes available for future wide-character read
operations. The file-position indicator is decremented by one or
more. The end-of-file indicator is cleared. The backing storage
of the file is not affected.
Note: wc need not be the last wide-character read from the stream;
it can be any other valid wide character.
If the implementation supports multiple push-back operations in a
row, the pushed-back wide characters will be read in reverse
order; however, only one level of push-back is guaranteed.
The ungetwc() function returns wc when successful, or WEOF upon
failure.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│ ungetwc() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
C11, POSIX.1-2008.
POSIX.1-2001, C99.
The behavior of ungetwc() depends on the LC_CTYPE category of the
current locale.
fgetwc(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
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⟨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-
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man-pages@man7.org
Linux man-pages 6.15 2025-05-17 ungetwc(3)
Pages that refer to this page: fgetc(3), fgetwc(3), gets(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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