121 lines
4.3 KiB
C
121 lines
4.3 KiB
C
/* Copyright (C) 1993, 1997 Free Software Foundation, Inc.
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This file is part of the GNU IO Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2, or (at
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your option) any later version.
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This library is distributed in the hope that it will be useful, but
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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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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this library; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA.
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As a special exception, if you link this library with files
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compiled with a GNU compiler to produce an executable, this does
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not cause the resulting executable to be covered by the GNU General
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Public License. This exception does not however invalidate any
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other reasons why the executable file might be covered by the GNU
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General Public License. */
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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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*
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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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* 3. [rescinded 22 July 1999]
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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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*
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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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*/
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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 <sys/types.h>
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#include <sys/stat.h>
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#ifdef __STDC__
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#include <stdlib.h>
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#include <unistd.h>
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#endif
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#ifdef _LIBC
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# undef isatty
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# define isatty(Fd) __isatty (Fd)
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#endif
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/*
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* Allocate a file buffer, or switch to unbuffered I/O.
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* Per the ANSI C standard, ALL tty devices default to line buffered.
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*
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* As a side effect, we set __SOPT or __SNPT (en/dis-able fseek
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* optimisation) right after the _fstat() that finds the buffer size.
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*/
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int
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_IO_file_doallocate (fp)
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_IO_FILE *fp;
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{
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_IO_size_t size;
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int couldbetty;
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char *p;
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struct stat st;
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#if !defined(_LIBC) && !defined(__linux__)
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/* If _IO_cleanup_registration_needed is non-zero, we should call the
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function it points to. This is to make sure _IO_cleanup gets called
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on exit. We call it from _IO_file_doallocate, since that is likely
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to get called by any program that does buffered I/O. */
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if (_IO_cleanup_registration_needed)
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(*_IO_cleanup_registration_needed) ();
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#endif
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if (fp->_fileno < 0 || _IO_SYSSTAT (fp, &st) < 0)
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{
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couldbetty = 0;
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size = _IO_BUFSIZ;
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#if 0
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/* do not try to optimise fseek() */
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fp->_flags |= __SNPT;
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#endif
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}
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else
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{
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couldbetty = S_ISCHR (st.st_mode);
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#if _IO_HAVE_ST_BLKSIZE
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size = st.st_blksize <= 0 ? _IO_BUFSIZ : st.st_blksize;
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#else
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size = _IO_BUFSIZ;
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#endif
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}
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ALLOC_BUF (p, size, EOF);
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_IO_setb (fp, p, p + size, 1);
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if (couldbetty && isatty (fp->_fileno))
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fp->_flags |= _IO_LINE_BUF;
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return 1;
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}
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