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Man Pages


Manual Reference Pages  -  UNGETWC (3)

NAME

ungetwc - un-get wide character from input stream

CONTENTS

Library
Synopsis
Description
Return Values
See Also
Standards

LIBRARY


.Lb libc

SYNOPSIS


.In stdio.h
.In wchar.h wint_t ungetwc wint_t wc FILE *stream

DESCRIPTION

The ungetwc function pushes the wide character wc (converted to an
.Vt wchar_t ) back onto the input stream pointed to by stream. The pushed-backed wide characters will be returned by subsequent reads on the stream (in reverse order). A successful intervening call, using the same stream, to one of the file positioning functions fseek(3), fsetpos(3), or rewind(3) will discard the pushed back wide characters.

One wide character of push-back is guaranteed, but as long as there is sufficient memory, an effectively infinite amount of pushback is allowed.

If a character is successfully pushed-back, the end-of-file indicator for the stream is cleared.

RETURN VALUES

The ungetwc function returns the wide character pushed-back after the conversion, or WEOF if the operation fails. If the value of the argument c character equals WEOF, the operation will fail and the stream will remain unchanged.

SEE ALSO

fseek(3), getwc(3)

STANDARDS

The ungetwc function conforms to -isoC-99.
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