/* Retrieve information about a FILE stream.
- Copyright (C) 2007-2011 Free Software Foundation, Inc.
+ Copyright (C) 2007-2021 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
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 <http://www.gnu.org/licenses/>. */
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdlib.h>
#include "stdio-impl.h"
+#if defined __DragonFly__
+/* Defined in libc, but not declared in <stdio.h>. */
+extern size_t __sreadahead (FILE *);
+#endif
+
+/* This file is not used on systems that have the __freadahead function,
+ namely musl libc. */
+
size_t
freadahead (FILE *fp)
{
-#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+#if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1
+ /* GNU libc, BeOS, Haiku, Linux libc5 */
if (fp->_IO_write_ptr > fp->_IO_write_base)
return 0;
return (fp->_IO_read_end - fp->_IO_read_ptr)
+ (fp->_flags & _IO_IN_BACKUP ? fp->_IO_save_end - fp->_IO_save_base :
0);
-#elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
+#elif defined __sferror || defined __DragonFly__ || defined __ANDROID__
+ /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Minix 3, Android */
if ((fp_->_flags & __SWR) != 0 || fp_->_r < 0)
return 0;
# if defined __DragonFly__
/* equivalent to
(fp->_ungetc_count == 0 ? fp->_rcount : fp->_ungetc_count - fp->_rcount) */
return (fp->_rcount > 0 ? fp->_rcount : fp->_ungetc_count - fp->_rcount);
-#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, NonStop Kernel */
+#elif defined __minix /* Minix */
+ if ((fp_->_flags & _IOWRITING) != 0)
+ return 0;
+ return fp_->_count;
+#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, UnixWare, mingw, MSVC, NonStop Kernel, OpenVMS */
if ((fp_->_flag & _IOWRT) != 0)
return 0;
return fp_->_cnt;
return (fp->__pushed_back
? fp->__get_limit - fp->__pushback_bufp + 1
: fp->__get_limit - fp->__bufp);
+#elif defined EPLAN9 /* Plan9 */
+ if (fp->state == 4 /* WR */ || fp->rp >= fp->wp)
+ return 0;
+ return fp->wp - fp->rp;
#elif defined SLOW_BUT_NO_HACKS /* users can define this */
abort ();
return 0;