UNGETWC(3) | Library Functions Manual | UNGETWC(3) |
ungetwc
—
#include <stdio.h>
#include <wchar.h>
wint_t
ungetwc
(wint_t
wc, FILE
*stream);
ungetwc
() function pushes the wide character
wc (converted to an 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.
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.
ungetwc
() function conforms to
ISO/IEC 9899:1999 (“ISO C99”).
October 24, 2001 | NetBSD 9.2 |