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76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
/* Copyright (C) 1993-2013 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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<http://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 "../libio/libioP.h"
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#include <limits.h>
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char *
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__gets_chk (char *buf, size_t size)
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{
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_IO_size_t count;
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int ch;
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char *retval;
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if (size == 0)
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__chk_fail ();
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_IO_acquire_lock (_IO_stdin);
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ch = _IO_getc_unlocked (_IO_stdin);
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if (ch == EOF)
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{
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retval = NULL;
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goto unlock_return;
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}
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if (ch == '\n')
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count = 0;
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else
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{
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/* This is very tricky since a file descriptor may be in the
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non-blocking mode. The error flag doesn't mean much in this
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case. We return an error only when there is a new error. */
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int old_error = _IO_stdin->_IO_file_flags & _IO_ERR_SEEN;
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_IO_stdin->_IO_file_flags &= ~_IO_ERR_SEEN;
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buf[0] = (char) ch;
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count = _IO_getline (_IO_stdin, buf + 1, size - 1, '\n', 0) + 1;
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if (_IO_stdin->_IO_file_flags & _IO_ERR_SEEN)
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{
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retval = NULL;
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goto unlock_return;
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}
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else
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_IO_stdin->_IO_file_flags |= old_error;
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}
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if (count >= size)
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__chk_fail ();
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buf[count] = 0;
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retval = buf;
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unlock_return:
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_IO_release_lock (_IO_stdin);
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return retval;
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}
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link_warning (__gets_chk, "the `gets' function is dangerous and should not be used.")
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