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Diffstat (limited to 'libc/libio/filedoalloc.c')
| -rw-r--r-- | libc/libio/filedoalloc.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/libc/libio/filedoalloc.c b/libc/libio/filedoalloc.c new file mode 100644 index 000000000..ca02dbeb3 --- /dev/null +++ b/libc/libio/filedoalloc.c @@ -0,0 +1,124 @@ +/* Copyright (C) 1993, 1997, 2001, 2002 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. + + As a special exception, if you link the code in this file with + files compiled with a GNU compiler to produce an executable, + that does not cause the resulting executable to be covered by + the GNU Lesser General Public License. This exception does not + however invalidate any other reasons why the executable file + might be covered by the GNU Lesser General Public License. + This exception applies to code released by its copyright holders + in files containing the exception. */ + +/* + Copyright (C) 1990 The Regents of the University of California. + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + 1. Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + 2. Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + 4. Neither the name of the University nor the names of its contributors + may be used to endorse or promote products derived from this software + without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + SUCH DAMAGE.*/ + +/* Modified for GNU iostream by Per Bothner 1991, 1992. */ + +#ifndef _POSIX_SOURCE +# define _POSIX_SOURCE +#endif +#include "libioP.h" +#include <sys/types.h> +#include <sys/stat.h> +#ifdef __STDC__ +#include <stdlib.h> +#include <unistd.h> +#endif + +#ifdef _LIBC +# undef isatty +# define isatty(Fd) __isatty (Fd) + +# include <device-nrs.h> +#endif + +/* + * Allocate a file buffer, or switch to unbuffered I/O. + * Per the ANSI C standard, ALL tty devices default to line buffered. + * + * As a side effect, we set __SOPT or __SNPT (en/dis-able fseek + * optimisation) right after the _fstat() that finds the buffer size. + */ + +int +_IO_file_doallocate (fp) + _IO_FILE *fp; +{ + _IO_size_t size; + char *p; + struct _G_stat64 st; + +#ifndef _LIBC + /* If _IO_cleanup_registration_needed is non-zero, we should call the + function it points to. This is to make sure _IO_cleanup gets called + on exit. We call it from _IO_file_doallocate, since that is likely + to get called by any program that does buffered I/O. */ + if (__builtin_expect (_IO_cleanup_registration_needed != NULL, 0)) + (*_IO_cleanup_registration_needed) (); +#endif + + size = _IO_BUFSIZ; + if (fp->_fileno >= 0 && __builtin_expect (_IO_SYSSTAT (fp, &st), 0) >= 0) + { + if (S_ISCHR (st.st_mode)) + { + /* Possibly a tty. */ + if ( +#ifdef DEV_TTY_P + DEV_TTY_P (&st) || +#endif + isatty (fp->_fileno)) + fp->_flags |= _IO_LINE_BUF; + } +#if _IO_HAVE_ST_BLKSIZE + if (st.st_blksize > 0) + size = st.st_blksize; +#endif + } + ALLOC_BUF (p, size, EOF); + INTUSE(_IO_setb) (fp, p, p + size, 1); + return 1; +} +INTDEF(_IO_file_doallocate) |