1 | /* Copyright (C) 1993-2016 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, see |
16 | <http://www.gnu.org/licenses/>. |
17 | |
18 | As a special exception, if you link the code in this file with |
19 | files compiled with a GNU compiler to produce an executable, |
20 | that does not cause the resulting executable to be covered by |
21 | the GNU Lesser General Public License. This exception does not |
22 | however invalidate any other reasons why the executable file |
23 | might be covered by the GNU Lesser General Public License. |
24 | This exception applies to code released by its copyright holders |
25 | in files containing the exception. */ |
26 | |
27 | /* |
28 | Copyright (C) 1990 The Regents of the University of California. |
29 | All rights reserved. |
30 | |
31 | Redistribution and use in source and binary forms, with or without |
32 | modification, are permitted provided that the following conditions |
33 | are met: |
34 | |
35 | 1. Redistributions of source code must retain the above copyright |
36 | notice, this list of conditions and the following disclaimer. |
37 | 2. Redistributions in binary form must reproduce the above copyright |
38 | notice, this list of conditions and the following disclaimer in the |
39 | documentation and/or other materials provided with the distribution. |
40 | 4. Neither the name of the University nor the names of its contributors |
41 | may be used to endorse or promote products derived from this software |
42 | without specific prior written permission. |
43 | |
44 | THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
45 | ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
46 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
47 | ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
48 | FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
49 | DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
50 | OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
51 | HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
52 | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
53 | OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
54 | SUCH DAMAGE.*/ |
55 | |
56 | /* Modified for GNU iostream by Per Bothner 1991, 1992. */ |
57 | |
58 | #ifndef _POSIX_SOURCE |
59 | # define _POSIX_SOURCE |
60 | #endif |
61 | #include "libioP.h" |
62 | #include <sys/types.h> |
63 | #include <sys/stat.h> |
64 | #include <stdlib.h> |
65 | #include <unistd.h> |
66 | |
67 | #ifdef _LIBC |
68 | # undef isatty |
69 | # define isatty(Fd) __isatty (Fd) |
70 | |
71 | # include <device-nrs.h> |
72 | #endif |
73 | |
74 | |
75 | static int |
76 | local_isatty (int fd) |
77 | { |
78 | int save_errno = errno; |
79 | int res = isatty (fd); |
80 | __set_errno (save_errno); |
81 | return res; |
82 | } |
83 | |
84 | |
85 | /* |
86 | * Allocate a file buffer, or switch to unbuffered I/O. |
87 | * Per the ANSI C standard, ALL tty devices default to line buffered. |
88 | * |
89 | * As a side effect, we set __SOPT or __SNPT (en/dis-able fseek |
90 | * optimisation) right after the _fstat() that finds the buffer size. |
91 | */ |
92 | |
93 | int |
94 | _IO_file_doallocate (_IO_FILE *fp) |
95 | { |
96 | _IO_size_t size; |
97 | char *p; |
98 | struct stat64 st; |
99 | |
100 | #ifndef _LIBC |
101 | /* If _IO_cleanup_registration_needed is non-zero, we should call the |
102 | function it points to. This is to make sure _IO_cleanup gets called |
103 | on exit. We call it from _IO_file_doallocate, since that is likely |
104 | to get called by any program that does buffered I/O. */ |
105 | if (__glibc_unlikely (_IO_cleanup_registration_needed != NULL)) |
106 | (*_IO_cleanup_registration_needed) (); |
107 | #endif |
108 | |
109 | size = _IO_BUFSIZ; |
110 | if (fp->_fileno >= 0 && __builtin_expect (_IO_SYSSTAT (fp, &st), 0) >= 0) |
111 | { |
112 | if (S_ISCHR (st.st_mode)) |
113 | { |
114 | /* Possibly a tty. */ |
115 | if ( |
116 | #ifdef DEV_TTY_P |
117 | DEV_TTY_P (&st) || |
118 | #endif |
119 | local_isatty (fp->_fileno)) |
120 | fp->_flags |= _IO_LINE_BUF; |
121 | } |
122 | #if _IO_HAVE_ST_BLKSIZE |
123 | if (st.st_blksize > 0) |
124 | size = st.st_blksize; |
125 | #endif |
126 | } |
127 | p = malloc (size); |
128 | if (__glibc_unlikely (p == NULL)) |
129 | return EOF; |
130 | _IO_setb (fp, p, p + size, 1); |
131 | return 1; |
132 | } |
133 | libc_hidden_def (_IO_file_doallocate) |
134 | |