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 | #endif |
71 | |
72 | /* |
73 | * Allocate a file buffer, or switch to unbuffered I/O. |
74 | * Per the ANSI C standard, ALL tty devices default to line buffered. |
75 | * |
76 | * As a side effect, we set __SOPT or __SNPT (en/dis-able fseek |
77 | * optimisation) right after the _fstat() that finds the buffer size. |
78 | */ |
79 | |
80 | int |
81 | _IO_wfile_doallocate (_IO_FILE *fp) |
82 | { |
83 | _IO_size_t size; |
84 | wchar_t *p; |
85 | |
86 | /* Allocate room for the external buffer. */ |
87 | if (fp->_IO_buf_base == NULL) |
88 | _IO_file_doallocate (fp); |
89 | |
90 | /* If narrow buffer is user allocated (set by setvbuf etc.), |
91 | use that size as the size of the wide buffer, when it is |
92 | allocated by _IO_file_doallocate, multiply that by size |
93 | of the wide character. */ |
94 | size = fp->_IO_buf_end - fp->_IO_buf_base; |
95 | if ((fp->_flags & _IO_USER_BUF)) |
96 | size = (size + sizeof (wchar_t) - 1) / sizeof (wchar_t); |
97 | p = malloc (size * sizeof (wchar_t)); |
98 | if (__glibc_unlikely (p == NULL)) |
99 | return EOF; |
100 | _IO_wsetb (fp, p, p + size, 1); |
101 | return 1; |
102 | } |
103 | |