UNGETWC

UNGETWC

NAME SYNOPSIS DESCRIPTION RETURN VALUE CONFORMING TO SEE ALSO NOTES

NAME

ungetwc - push back a wide character onto a FILE stream

SYNOPSIS

#include 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 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

ISO/ANSI C, UNIX98

SEE ALSO

fgetwc(3)

NOTES

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