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



NAME
       ungetwc - push back a wide character onto a FILE stream

SYNOPSIS
       #include <wchar.h>

       wint_t ungetwc(wint_t wc, FILE *stream);

DESCRIPTION
       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.

RETURN VALUE
       The ungetwc() function returns wc when successful, or WEOF upon failure.

CONFORMING TO
       C99.

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

SEE ALSO
       fgetwc(3)

COLOPHON
       This  page  is  part of release 3.25 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)