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UNGETWC(3) Linux Programmer's Manual UNGETWC(3)
ungetwc - push back a wide character onto a FILE stream
wint_t ungetwc(wint_t wc, FILE *stream);
The ungetwc function is the wide-character equivalent of the ungetc 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 avail-
able for future wide character read operations. The file-position indicator is decre-
mented 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
The ungetwc function returns wc when successful, or WEOF upon failure.
ISO/ANSI C, UNIX98
The behaviour of ungetwc depends on the LC_CTYPE category of the current locale.
GNU 1999-09-19 UNGETWC(3)
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