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UNGETWC(3) Linux Programmer's Manual UNGETWC(3)
ungetwc - push back a wide character onto a FILE stream
#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.
C99.
The behavior of ungetwc() depends on the LC_CTYPE category of the current
locale.
fgetwc(3)
This page is part of release 3.32 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/.
GNU 1999-09-19 UNGETWC(3)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface