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/* Copyright (C) 2004 Manuel Novoa III <mjn3@codepoet.org>
*
* GNU Library General Public License (LGPL) version 2 or later.
*
* Dedicated to Toni. See uClibc/DEDICATION.mjn3 for details.
*/
#include "_stdio.h"
/* Note: This is the application-callable ungetwc. If wscanf calls this, it
* should also set stream->__ungot[1] to 0 if this is the only ungot, as well
* as reset stream->__ungot_width[1] for use by _stdio_adjpos().
*/
wint_t ungetwc(wint_t c, register FILE *stream)
{
__STDIO_AUTO_THREADLOCK_VAR;
__STDIO_AUTO_THREADLOCK(stream);
__STDIO_STREAM_VALIDATE(stream); /* debugging only */
/* Note: Even if c == WEOF, we need to initialize/verify the
* stream's orientation and ensure the stream is in reading
* mode (if readable and properly oriented). */
if ((!__STDIO_STREAM_IS_WIDE_READING(stream)
&& __STDIO_STREAM_TRANS_TO_READ(stream, __FLAG_WIDE))
|| ((stream->__modeflags & __FLAG_UNGOT)
&& ((stream->__modeflags & 1) || stream->__ungot[1]))
|| (c == WEOF)
) {
c = WEOF;
} else {
/* In the wide case, getc macros should already be disabled. */
/* __STDIO_STREAM_DISABLE_GETC(stream); */
/* Flag this as a user ungot, as scanf does the necessary fixup. */
stream->__ungot[1] = 1;
stream->__ungot[(++stream->__modeflags) & 1] = c;
/* Note: ungot_width is handled by fgetwc. */
__STDIO_STREAM_CLEAR_EOF(stream); /* Must clear end-of-file flag. */
}
__STDIO_STREAM_VALIDATE(stream);
__STDIO_AUTO_THREADUNLOCK(stream);
return c;
}
libc_hidden_def(ungetwc)
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