Section (3) ungetwc
ungetwc — push back a wide character onto a FILE stream
ungetwc() function is
the wide-character equivalent of the ungetc(3) function. It
pushes back a wide character onto
stream and returns it.
WEOF, it returns
wc is an invalid wide
character, it sets
EILSEQ and returns
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.
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.
For an explanation of the terms used in this section, see attributes(7).
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