1: /* Copyright (C) 1993, 1997, 2001, 2002 Free Software Foundation, Inc.
    2:    This file is part of the GNU C Library.
    3: 
    4:    The GNU C Library is free software; you can redistribute it and/or
    5:    modify it under the terms of the GNU Lesser General Public
    6:    License as published by the Free Software Foundation; either
    7:    version 2.1 of the License, or (at your option) any later version.
    8: 
    9:    The GNU C Library is distributed in the hope that it will be useful,
   10:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   11:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   12:    Lesser General Public License for more details.
   13: 
   14:    You should have received a copy of the GNU Lesser General Public
   15:    License along with the GNU C Library; if not, write to the Free
   16:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   17:    02111-1307 USA.
   18: 
   19:    As a special exception, if you link the code in this file with
   20:    files compiled with a GNU compiler to produce an executable,
   21:    that does not cause the resulting executable to be covered by
   22:    the GNU Lesser General Public License.  This exception does not
   23:    however invalidate any other reasons why the executable file
   24:    might be covered by the GNU Lesser General Public License.
   25:    This exception applies to code released by its copyright holders
   26:    in files containing the exception.  */
   27: 
   28: /*
   29:    Copyright (C) 1990 The Regents of the University of California.
   30:    All rights reserved.
   31: 
   32:    Redistribution and use in source and binary forms, with or without
   33:    modification, are permitted provided that the following conditions
   34:    are met:
   35: 
   36:    1. Redistributions of source code must retain the above copyright
   37:       notice, this list of conditions and the following disclaimer.
   38:    2. Redistributions in binary form must reproduce the above copyright
   39:       notice, this list of conditions and the following disclaimer in the
   40:       documentation and/or other materials provided with the distribution.
   41:    4. Neither the name of the University nor the names of its contributors
   42:       may be used to endorse or promote products derived from this software
   43:       without specific prior written permission.
   44:    
   45:    THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   46:    ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   47:    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   48:    ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   49:    FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   50:    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   51:    OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   52:    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   53:    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   54:    OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   55:    SUCH DAMAGE.*/
   56: 
   57: /* Modified for GNU iostream by Per Bothner 1991, 1992. */
   58: 
   59: #ifndef _POSIX_SOURCE
   60: # define _POSIX_SOURCE
   61: #endif
   62: #include "libioP.h"
   63: #include <sys/types.h>
   64: #include <sys/stat.h>
   65: #ifdef __STDC__
   66: #include <stdlib.h>
   67: #include <unistd.h>
   68: #endif
   69: 
   70: #ifdef _LIBC
   71: # undef isatty
   72: # define isatty(Fd) __isatty (Fd)
   73: 
   74: # include <device-nrs.h>
   75: #endif
   76: 
   77: /*
   78:  * Allocate a file buffer, or switch to unbuffered I/O.
   79:  * Per the ANSI C standard, ALL tty devices default to line buffered.
   80:  *
   81:  * As a side effect, we set __SOPT or __SNPT (en/dis-able fseek
   82:  * optimisation) right after the _fstat() that finds the buffer size.
   83:  */
   84: 
   85: int
   86: _IO_file_doallocate (fp)
   87:      _IO_FILE *fp;
   88: {
   89:   _IO_size_t size;
   90:   char *p;
   91:   struct _G_stat64 st;
   92: 
   93: #ifndef _LIBC
   94:   /* If _IO_cleanup_registration_needed is non-zero, we should call the
   95:      function it points to.  This is to make sure _IO_cleanup gets called
   96:      on exit.  We call it from _IO_file_doallocate, since that is likely
   97:      to get called by any program that does buffered I/O. */
   98:   if (__builtin_expect (_IO_cleanup_registration_needed != NULL, 0))
   99:     (*_IO_cleanup_registration_needed) ();
  100: #endif
  101: 
  102:   size = _IO_BUFSIZ;
  103:   if (fp->_fileno >= 0 && __builtin_expect (_IO_SYSSTAT (fp, &st), 0) >= 0)
  104:     {
  105:       if (S_ISCHR (st.st_mode))
  106:         {
  107:           /* Possibly a tty.  */
  108:           if (
  109: #ifdef DEV_TTY_P
  110:               DEV_TTY_P (&st) ||
  111: #endif
  112:               isatty (fp->_fileno))
  113:             fp->_flags |= _IO_LINE_BUF;
  114:         }
  115: #if _IO_HAVE_ST_BLKSIZE
  116:       if (st.st_blksize > 0)
  117:         size = st.st_blksize;
  118: #endif
  119:     }
  120:   ALLOC_BUF (p, size, EOF);
  121:   INTUSE(_IO_setb) (fp, p, p + size, 1);
  122:   return 1;
  123: }
  124: INTDEF(_IO_file_doallocate)