1 /* Copyright (C) 1993,96,97,98,99,2000,2001 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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
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. */
30 #define _IOFBF 0 /* Fully buffered. */
31 #define _IOLBF 1 /* Line buffered. */
32 #define _IONBF 2 /* No buffering. */
35 _IO_setvbuf (fp, buf, mode, size)
43 _IO_cleanup_region_start ((void (*) (void *)) _IO_funlockfile, fp);
48 fp->_IO_file_flags &= ~_IO_LINE_BUF|_IO_UNBUFFERED;
51 if (fp->_IO_buf_base == NULL)
53 /* There is no flag to distinguish between "fully buffered
54 mode has been explicitly set" as opposed to "line
55 buffering has not been explicitly set". In both
56 cases, _IO_LINE_BUF is off. If this is a tty, and
57 _IO_filedoalloc later gets called, it cannot know if
58 it should set the _IO_LINE_BUF flag (because that is
59 the default), or not (because we have explicitly asked
60 for fully buffered mode). So we make sure a buffer
61 gets allocated now, and explicitly turn off line
64 A possibly cleaner alternative would be to add an
65 extra flag, but then flags are a finite resource. */
66 if (_IO_DOALLOCATE (fp) < 0)
71 fp->_IO_file_flags &= ~_IO_LINE_BUF;
78 fp->_IO_file_flags &= ~_IO_UNBUFFERED;
79 fp->_IO_file_flags |= _IO_LINE_BUF;
87 fp->_IO_file_flags &= ~_IO_LINE_BUF;
88 fp->_IO_file_flags |= _IO_UNBUFFERED;
96 result = _IO_SETBUF (fp, buf, size) == NULL ? EOF : 0;
97 if (result == 0 && fp->_vtable_offset == 0 && fp->_mode == 0
98 && _IO_CHECK_WIDE (fp))
99 /* We also have to set the buffer using the wide char function. */
100 result = _IO_WSETBUF (fp, buf, size) == NULL ? EOF : 0;
103 _IO_funlockfile (fp);
104 _IO_cleanup_region_end (0);
109 weak_alias (_IO_setvbuf, setvbuf)