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45 lines
1.6 KiB
C
45 lines
1.6 KiB
C
/* Copyright (C) 1993-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>.
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As a special exception, if you link the code in this file with
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files compiled with a GNU compiler to produce an executable,
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that does not cause the resulting executable to be covered by
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the GNU Lesser General Public License. This exception does not
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however invalidate any other reasons why the executable file
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might be covered by the GNU Lesser General Public License.
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This exception applies to code released by its copyright holders
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in files containing the exception. */
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#include "libioP.h"
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int
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ungetc (int c, FILE *fp)
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{
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int result;
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CHECK_FILE (fp, EOF);
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if (c == EOF)
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return EOF;
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if (!_IO_need_lock (fp))
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return _IO_sputbackc (fp, (unsigned char) c);
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_IO_acquire_lock (fp);
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result = _IO_sputbackc (fp, (unsigned char) c);
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_IO_release_lock (fp);
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return result;
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}
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libc_hidden_def (ungetc)
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strong_alias (ungetc, _IO_ungetc)
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