| 1 | /* Retrieve information about a FILE stream.
|
|---|
| 2 | Copyright (C) 2007-2022 Free Software Foundation, Inc.
|
|---|
| 3 |
|
|---|
| 4 | This file is free software: you can redistribute it and/or modify
|
|---|
| 5 | it under the terms of the GNU Lesser General Public License as
|
|---|
| 6 | published by the Free Software Foundation, either version 3 of the
|
|---|
| 7 | License, or (at your option) any later version.
|
|---|
| 8 |
|
|---|
| 9 | This file 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 Lesser General Public License for more details.
|
|---|
| 13 |
|
|---|
| 14 | You should have received a copy of the GNU Lesser General Public License
|
|---|
| 15 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
|---|
| 16 |
|
|---|
| 17 | #include <config.h>
|
|---|
| 18 |
|
|---|
| 19 | /* Specification. */
|
|---|
| 20 | #include "fwriting.h"
|
|---|
| 21 |
|
|---|
| 22 | #include "stdio-impl.h"
|
|---|
| 23 |
|
|---|
| 24 | /* This file is not used on systems that have the __fwriting function,
|
|---|
| 25 | namely glibc >= 2.2, Solaris >= 7, UnixWare >= 7.1.4.MP4, Cygwin >= 1.7.34,
|
|---|
| 26 | Android API >= 29, musl libc. */
|
|---|
| 27 |
|
|---|
| 28 | bool
|
|---|
| 29 | fwriting (FILE *fp)
|
|---|
| 30 | {
|
|---|
| 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
|
|---|
| 33 | fast macros. */
|
|---|
| 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_READS | _IO_CURRENTLY_PUTTING)) != 0;
|
|---|
| 37 | #elif defined __sferror || defined __DragonFly__ || defined __ANDROID__
|
|---|
| 38 | /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin < 1.7.34, Minix 3, Android */
|
|---|
| 39 | return (fp_->_flags & __SWR) != 0;
|
|---|
| 40 | #elif defined __EMX__ /* emx+gcc */
|
|---|
| 41 | return (fp->_flags & _IOWRT) != 0;
|
|---|
| 42 | #elif defined __minix /* Minix */
|
|---|
| 43 | return (fp->_flags & _IOWRITING) != 0;
|
|---|
| 44 | #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, UnixWare, mingw, MSVC, NonStop Kernel, OpenVMS */
|
|---|
| 45 | return (fp_->_flag & _IOWRT) != 0;
|
|---|
| 46 | #elif defined __UCLIBC__ /* uClibc */
|
|---|
| 47 | return (fp->__modeflags & __FLAG_WRITING) != 0;
|
|---|
| 48 | #elif defined __QNX__ /* QNX */
|
|---|
| 49 | return ((fp->_Mode & 0x1 /* _MOPENR */) == 0
|
|---|
| 50 | || (fp->_Mode & 0x2000 /* _MWRITE */) != 0);
|
|---|
| 51 | #elif defined __MINT__ /* Atari FreeMiNT */
|
|---|
| 52 | if (!fp->__mode.__read)
|
|---|
| 53 | return 1;
|
|---|
| 54 | if (!fp->__mode.__write)
|
|---|
| 55 | return 0;
|
|---|
| 56 | # ifdef _IO_CURRENTLY_PUTTING /* Flag added on 2009-02-28 */
|
|---|
| 57 | return (fp->__flags & _IO_CURRENTLY_PUTTING) != 0;
|
|---|
| 58 | # else
|
|---|
| 59 | return (fp->__buffer < fp->__put_limit /*|| fp->__bufp == fp->__get_limit ??*/);
|
|---|
| 60 | # endif
|
|---|
| 61 | #elif defined EPLAN9 /* Plan9 */
|
|---|
| 62 | if (fp->state == 0 /* CLOSED */ || fp->state == 3 /* RD */)
|
|---|
| 63 | return 0;
|
|---|
| 64 | return (fp->state == 4 /* WR */ && (fp->bufl == 0 || fp->wp < fp->rp));
|
|---|
| 65 | #else
|
|---|
| 66 | # error "Please port gnulib fwriting.c to your platform!"
|
|---|
| 67 | #endif
|
|---|
| 68 | }
|
|---|
