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RedHat 9 (Linux i386) - man page for ungetwc (redhat section 3)

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 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
       guaranteed.

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

CONFORMING TO
       ISO/ANSI C, UNIX98

SEE ALSO
       fgetwc(3)

NOTES
       The behaviour of ungetwc depends on the LC_CTYPE category of the current locale.

GNU					    1999-09-19				       UNGETWC(3)


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