UNGETWCSection: Linux Programmer's Manual (3)
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NAMEungetwc - push back a wide character onto a FILE stream
#include <wchar.h> wint_t ungetwc(wint_t wc, FILE *stream);
DESCRIPTIONThe 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.
RETURN VALUEThe ungetwc() function returns wc when successful, or WEOF upon failure.
NOTESThe behavior of ungetwc() depends on the LC_CTYPE category of the current locale.
COLOPHONThis page is part of release 3.21 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.