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688903eb | 1 | /* Copyright (C) 1993-2018 Free Software Foundation, Inc. |
41bdb6e2 | 2 | This file is part of the GNU C Library. |
96aa2d94 | 3 | |
41bdb6e2 AJ |
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. | |
96aa2d94 | 8 | |
41bdb6e2 AJ |
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 | |
40a55d20 | 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
41bdb6e2 | 12 | Lesser General Public License for more details. |
96aa2d94 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. | |
96aa2d94 | 17 | |
41bdb6e2 AJ |
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. */ | |
96aa2d94 RM |
26 | |
27 | /* | |
aeb25823 AJ |
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. | |
aec84f53 | 43 | |
aeb25823 AJ |
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.*/ | |
96aa2d94 RM |
55 | |
56 | /* Modified for GNU iostream by Per Bothner 1991, 1992. */ | |
57 | ||
96aa2d94 | 58 | #include "libioP.h" |
abc40bb2 | 59 | #include <device-nrs.h> |
96aa2d94 | 60 | #include <sys/stat.h> |
96aa2d94 | 61 | #include <stdlib.h> |
68dbb3a6 | 62 | #include <unistd.h> |
68dbb3a6 | 63 | |
abc40bb2 | 64 | /* Return the result of isatty, without changing errno. */ |
aec84f53 UD |
65 | static int |
66 | local_isatty (int fd) | |
67 | { | |
68 | int save_errno = errno; | |
abc40bb2 | 69 | int res = __isatty (fd); |
aec84f53 UD |
70 | __set_errno (save_errno); |
71 | return res; | |
72 | } | |
73 | ||
abc40bb2 FW |
74 | /* Allocate a file buffer, or switch to unbuffered I/O. Streams for |
75 | TTY devices default to line buffered. */ | |
96aa2d94 | 76 | int |
9d46370c | 77 | _IO_file_doallocate (_IO_FILE *fp) |
96aa2d94 | 78 | { |
40a55d20 | 79 | _IO_size_t size; |
40a55d20 | 80 | char *p; |
c8450f70 | 81 | struct stat64 st; |
96aa2d94 | 82 | |
91099cf4 UD |
83 | size = _IO_BUFSIZ; |
84 | if (fp->_fileno >= 0 && __builtin_expect (_IO_SYSSTAT (fp, &st), 0) >= 0) | |
96aa2d94 | 85 | { |
91099cf4 UD |
86 | if (S_ISCHR (st.st_mode)) |
87 | { | |
88 | /* Possibly a tty. */ | |
89 | if ( | |
90 | #ifdef DEV_TTY_P | |
11c0b1e3 | 91 | DEV_TTY_P (&st) || |
96aa2d94 | 92 | #endif |
aec84f53 | 93 | local_isatty (fp->_fileno)) |
91099cf4 UD |
94 | fp->_flags |= _IO_LINE_BUF; |
95 | } | |
63fb8f9a | 96 | #if defined _STATBUF_ST_BLKSIZE |
705a79f8 | 97 | if (st.st_blksize > 0 && st.st_blksize < _IO_BUFSIZ) |
91099cf4 | 98 | size = st.st_blksize; |
96aa2d94 RM |
99 | #endif |
100 | } | |
8a29509d PP |
101 | p = malloc (size); |
102 | if (__glibc_unlikely (p == NULL)) | |
103 | return EOF; | |
d18ea0c5 | 104 | _IO_setb (fp, p, p + size, 1); |
96aa2d94 RM |
105 | return 1; |
106 | } | |
d18ea0c5 | 107 | libc_hidden_def (_IO_file_doallocate) |