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108 lines
3.9 KiB
C
108 lines
3.9 KiB
C
/* Copyright (C) 1993-2017 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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/*
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Copyright (C) 1990 The Regents of the University of California.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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4. Neither the name of the University nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.*/
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/* Modified for GNU iostream by Per Bothner 1991, 1992. */
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#include "libioP.h"
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#include <device-nrs.h>
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#include <sys/stat.h>
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#include <stdlib.h>
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#include <unistd.h>
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/* Return the result of isatty, without changing errno. */
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static int
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local_isatty (int fd)
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{
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int save_errno = errno;
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int res = __isatty (fd);
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__set_errno (save_errno);
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return res;
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}
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/* Allocate a file buffer, or switch to unbuffered I/O. Streams for
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TTY devices default to line buffered. */
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int
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_IO_file_doallocate (_IO_FILE *fp)
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{
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_IO_size_t size;
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char *p;
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struct stat64 st;
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size = _IO_BUFSIZ;
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if (fp->_fileno >= 0 && __builtin_expect (_IO_SYSSTAT (fp, &st), 0) >= 0)
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{
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if (S_ISCHR (st.st_mode))
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{
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/* Possibly a tty. */
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if (
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#ifdef DEV_TTY_P
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DEV_TTY_P (&st) ||
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#endif
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local_isatty (fp->_fileno))
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fp->_flags |= _IO_LINE_BUF;
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}
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#if _IO_HAVE_ST_BLKSIZE
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if (st.st_blksize > 0 && st.st_blksize < _IO_BUFSIZ)
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size = st.st_blksize;
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#endif
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}
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p = malloc (size);
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if (__glibc_unlikely (p == NULL))
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return EOF;
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_IO_setb (fp, p, p + size, 1);
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return 1;
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}
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libc_hidden_def (_IO_file_doallocate)
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