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

NAME         top

       ungetwc - push back a wide character onto a FILE stream

SYNOPSIS         top

       #include <wchar.h>

       wint_t ungetwc(wint_t wc, FILE *stream);

DESCRIPTION         top

       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

       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.

RETURN VALUE         top

       The ungetwc() function returns wc when successful, or WEOF upon

ATTRIBUTES         top

       For an explanation of the terms used in this section, see

       │Interface Attribute     Value   │
       │ungetwc() │ Thread safety │ MT-Safe │

CONFORMING TO         top

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

NOTES         top

       The behavior of ungetwc() depends on the LC_CTYPE category of the
       current locale.

SEE ALSO         top


COLOPHON         top

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GNU                              2015-08-08                       UNGETWC(3)