1 /* Retrieve information about a FILE stream.
2 Copyright (C) 2007-2018 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program 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
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
22 #include "stdio-impl.h"
24 /* Don't use glibc's __freading function in glibc < 2.7, see
25 <https://sourceware.org/bugzilla/show_bug.cgi?id=4359> */
26 #if !(HAVE___FREADING && (!defined __GLIBC__ || defined __UCLIBC__ || __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7)))
31 /* Most systems provide FILE as a struct and the necessary bitmask in
32 <stdio.h>, because they need it for implementing getc() and putc() as
34 # if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1
35 /* GNU libc, BeOS, Haiku, Linux libc5 */
36 return ((fp
->_flags
& _IO_NO_WRITES
) != 0
37 || ((fp
->_flags
& (_IO_NO_READS
| _IO_CURRENTLY_PUTTING
)) == 0
38 && fp
->_IO_read_base
!= NULL
));
39 # elif defined __sferror || defined __DragonFly__ || defined __ANDROID__
40 /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Minix 3, Android */
41 return (fp_
->_flags
& __SRD
) != 0;
42 # elif defined __EMX__ /* emx+gcc */
43 return (fp
->_flags
& _IOREAD
) != 0;
44 # elif defined __minix /* Minix */
45 return (fp
->_flags
& _IOREADING
) != 0;
46 # elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, MSVC, NonStop Kernel, OpenVMS */
47 # if defined __sun /* Solaris */
48 return (fp_
->_flag
& _IOREAD
) != 0 && (fp_
->_flag
& _IOWRT
) == 0;
50 return (fp_
->_flag
& _IOREAD
) != 0;
52 # elif defined __UCLIBC__ /* uClibc */
53 return (fp
->__modeflags
& (__FLAG_READONLY
| __FLAG_READING
)) != 0;
54 # elif defined __QNX__ /* QNX */
55 return ((fp
->_Mode
& 0x2 /* _MOPENW */) == 0
56 || (fp
->_Mode
& 0x1000 /* _MREAD */) != 0);
57 # elif defined __MINT__ /* Atari FreeMiNT */
58 if (!fp
->__mode
.__write
)
60 if (!fp
->__mode
.__read
)
62 # ifdef _IO_CURRENTLY_GETTING /* Flag added on 2009-02-28 */
63 return (fp
->__flags
& _IO_CURRENTLY_GETTING
) != 0;
65 return (fp
->__buffer
< fp
->__get_limit
/*|| fp->__bufp == fp->__put_limit ??*/);
67 # elif defined EPLAN9 /* Plan9 */
68 if (fp
->state
== 0 /* CLOSED */ || fp
->state
== 4 /* WR */)
70 return (fp
->state
== 3 /* RD */ && (fp
->bufl
== 0 || fp
->rp
< fp
->wp
));
72 # error "Please port gnulib freading.c to your platform!"