| /* fpending.c -- return the number of pending output bytes on a stream |
| Copyright (C) 2000, 2004, 2006-2007, 2009-2021 Free Software Foundation, |
| Inc. |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| |
| /* Written by Jim Meyering. */ |
| |
| #include <config.h> |
| |
| /* Specification. */ |
| #include "fpending.h" |
| |
| #include "stdio-impl.h" |
| |
| /* This file is not used on systems that already have the __fpending function, |
| namely glibc >= 2.2, Solaris >= 7, UnixWare >= 7.1.4.MP4, Cygwin >= 1.7.34, |
| Android API >= 23. */ |
| |
| /* Return the number of pending (aka buffered, unflushed) |
| bytes on the stream, FP, that is open for writing. */ |
| size_t |
| __fpending (FILE *fp) |
| { |
| /* Most systems provide FILE as a struct and the necessary bitmask in |
| <stdio.h>, because they need it for implementing getc() and putc() as |
| fast macros. */ |
| #if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 |
| /* GNU libc, BeOS, Haiku, Linux libc5 */ |
| return fp->_IO_write_ptr - fp->_IO_write_base; |
| #elif defined __sferror || defined __DragonFly__ || defined __ANDROID__ |
| /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin < 1.7.34, Minix 3, Android */ |
| return fp->_p - fp->_bf._base; |
| #elif defined __EMX__ /* emx+gcc */ |
| return fp->_ptr - fp->_buffer; |
| #elif defined __minix /* Minix */ |
| return fp_->_ptr - fp_->_buf; |
| #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, UnixWare, mingw, MSVC, NonStop Kernel, OpenVMS */ |
| return (fp_->_ptr ? fp_->_ptr - fp_->_base : 0); |
| #elif defined __UCLIBC__ /* uClibc */ |
| return (fp->__modeflags & __FLAG_WRITING ? fp->__bufpos - fp->__bufstart : 0); |
| #elif defined __QNX__ /* QNX */ |
| return (fp->_Mode & 0x2000 /*_MWRITE*/ ? fp->_Next - fp->_Buf : 0); |
| #elif defined __MINT__ /* Atari FreeMiNT */ |
| return fp->__bufp - fp->__buffer; |
| #elif defined EPLAN9 /* Plan9 */ |
| return fp->wp - fp->buf; |
| #else |
| # error "Please port gnulib fpending.c to your platform!" |
| return 1; |
| #endif |
| } |