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Member "cpio-2.13/gnu/fpending.c" (2 Jan 2017, 2481 Bytes) of package /linux/misc/cpio-2.13.tar.bz2:


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    1 /* fpending.c -- return the number of pending output bytes on a stream
    2    Copyright (C) 2000, 2004, 2006-2007, 2009-2017 Free Software Foundation,
    3    Inc.
    4 
    5    This program is free software: you can redistribute it and/or modify
    6    it under the terms of the GNU General Public License as published by
    7    the Free Software Foundation; either version 3 of the License, or
    8    (at your option) any later version.
    9 
   10    This program is distributed in the hope that it will be useful,
   11    but WITHOUT ANY WARRANTY; without even the implied warranty of
   12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   13    GNU General Public License for more details.
   14 
   15    You should have received a copy of the GNU General Public License
   16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
   17 
   18 /* Written by Jim Meyering. */
   19 
   20 #include <config.h>
   21 
   22 /* Specification.  */
   23 #include "fpending.h"
   24 
   25 #include "stdio-impl.h"
   26 
   27 /* Return the number of pending (aka buffered, unflushed)
   28    bytes on the stream, FP, that is open for writing.  */
   29 size_t
   30 __fpending (FILE *fp)
   31 {
   32   /* Most systems provide FILE as a struct and the necessary bitmask in
   33      <stdio.h>, because they need it for implementing getc() and putc() as
   34      fast macros.  */
   35 #if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
   36   return fp->_IO_write_ptr - fp->_IO_write_base;
   37 #elif defined __sferror || defined __DragonFly__ || defined __ANDROID__
   38   /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Android */
   39   return fp->_p - fp->_bf._base;
   40 #elif defined __EMX__                /* emx+gcc */
   41   return fp->_ptr - fp->_buffer;
   42 #elif defined __minix                /* Minix */
   43   return fp_->_ptr - fp_->_buf;
   44 #elif defined _IOERR                 /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, MSVC, NonStop Kernel */
   45   return (fp_->_ptr ? fp_->_ptr - fp_->_base : 0);
   46 #elif defined __UCLIBC__             /* uClibc */
   47   return (fp->__modeflags & __FLAG_WRITING ? fp->__bufpos - fp->__bufstart : 0);
   48 #elif defined __QNX__                /* QNX */
   49   return (fp->_Mode & 0x2000 /*_MWRITE*/ ? fp->_Next - fp->_Buf : 0);
   50 #elif defined __MINT__               /* Atari FreeMiNT */
   51   return fp->__bufp - fp->__buffer;
   52 #elif defined EPLAN9                 /* Plan9 */
   53   return fp->wp - fp->buf;
   54 #elif defined __VMS                  /* VMS */
   55   return (*fp)->_ptr - (*fp)->_base;
   56 #else
   57 # error "Please port gnulib fpending.c to your platform!"
   58   return 1;
   59 #endif
   60 }