| 1 | /* fpending.c -- return the number of pending output bytes on a stream
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| 2 | Copyright (C) 2000, 2004, 2006-2007, 2009-2022 Free Software Foundation,
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| 3 | Inc.
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| 4 |
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| 5 | This program is free software: you can redistribute it and/or modify
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| 6 | it under the terms of the GNU General Public License as published by
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| 7 | the Free Software Foundation, either version 3 of the License, or
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| 8 | (at your option) any later version.
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| 9 |
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| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU General Public License
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| 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 17 |
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| 18 | /* Written by Jim Meyering. */
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| 19 |
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| 20 | #include <config.h>
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| 21 |
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| 22 | /* Specification. */
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| 23 | #include "fpending.h"
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| 24 |
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| 25 | #include "stdio-impl.h"
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| 26 |
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| 27 | /* This file is not used on systems that already have the __fpending function,
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| 28 | namely glibc >= 2.2, Solaris >= 7, UnixWare >= 7.1.4.MP4, Cygwin >= 1.7.34,
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| 29 | Android API >= 23. */
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| 30 |
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| 31 | /* Return the number of pending (aka buffered, unflushed)
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| 32 | bytes on the stream, FP, that is open for writing. */
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| 33 | size_t
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| 34 | __fpending (FILE *fp)
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| 35 | {
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| 36 | /* Most systems provide FILE as a struct and the necessary bitmask in
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| 37 | <stdio.h>, because they need it for implementing getc() and putc() as
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| 38 | fast macros. */
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| 39 | #if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1
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| 40 | /* GNU libc, BeOS, Haiku, Linux libc5 */
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| 41 | return fp->_IO_write_ptr - fp->_IO_write_base;
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| 42 | #elif defined __sferror || defined __DragonFly__ || defined __ANDROID__
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| 43 | /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin < 1.7.34, Minix 3, Android */
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| 44 | return fp->_p - fp->_bf._base;
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| 45 | #elif defined __EMX__ /* emx+gcc */
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| 46 | return fp->_ptr - fp->_buffer;
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| 47 | #elif defined __minix /* Minix */
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| 48 | return fp_->_ptr - fp_->_buf;
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| 49 | #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, UnixWare, mingw, MSVC, NonStop Kernel, OpenVMS */
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| 50 | return (fp_->_ptr ? fp_->_ptr - fp_->_base : 0);
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| 51 | #elif defined __UCLIBC__ /* uClibc */
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| 52 | return (fp->__modeflags & __FLAG_WRITING ? fp->__bufpos - fp->__bufstart : 0);
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| 53 | #elif defined __QNX__ /* QNX */
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| 54 | return (fp->_Mode & 0x2000 /*_MWRITE*/ ? fp->_Next - fp->_Buf : 0);
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| 55 | #elif defined __MINT__ /* Atari FreeMiNT */
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| 56 | return fp->__bufp - fp->__buffer;
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| 57 | #elif defined EPLAN9 /* Plan9 */
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| 58 | return fp->wp - fp->buf;
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| 59 | #else
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| 60 | # error "Please port gnulib fpending.c to your platform!"
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| 61 | return 1;
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| 62 | #endif
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| 63 | }
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