ungetwc(3) - NetBSD Manual Pages

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UNGETWC(3)              NetBSD Library Functions Manual             UNGETWC(3)

ungetwc -- un-get wide character from input stream
Standard C Library (libc, -lc)
#include <stdio.h> #include <wchar.h> wint_t ungetwc(wint_t wc, FILE *stream);
The 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.
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.
fseek(3), getwc(3)
The ungetwc() function conforms to ISO/IEC 9899:1999 (``ISO C99'').
The current implementation uses a fixed sized ungetwc-buffer. NetBSD 10.99 October 24, 2001 NetBSD 10.99
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