/* 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(). */ /* libc_hidden_proto(ungetwc) */ 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)