112 lines
3.7 KiB
C
112 lines
3.7 KiB
C
/* Copyright (C) 1993, 1997, 2001 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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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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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* Modified for GNU iostream by Per Bothner 1991, 1992. */
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#ifndef _POSIX_SOURCE
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# define _POSIX_SOURCE
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#endif
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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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# include <device-nrs.h>
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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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char *p;
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struct _G_stat64 st;
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#ifndef _LIBC
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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 (__builtin_expect (_IO_cleanup_registration_needed != NULL, 0))
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(*_IO_cleanup_registration_needed) ();
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#endif
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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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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)
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size = st.st_blksize;
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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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return 1;
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}
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