NEWS.stable: log cherry-pick [e446f25]->[c092018] relocatable-shell: Update suggested...

[gnulib.git] / lib / freading.c

diff --git a/lib/freading.c b/lib/freading.c
index 15ad069..dee4325 100644 (file)
--- a/lib/freading.c
+++ b/lib/freading.c
@@ -1,28 +1,29 @@
 /* Retrieve information about a FILE stream.
-   Copyright (C) 2007 Free Software Foundation, Inc.
+   Copyright (C) 2007-2014 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
+   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 2, or (at your option)
-   any later version.
+   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, write to the Free Software Foundation,
-   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
 /* Specification.  */
 #include "freading.h"
 
-/* Don't use glibc's __freading function, see
+#include "stdio-impl.h"
+
+/* Don't use glibc's __freading function in glibc < 2.7, see
    <http://sourceware.org/bugzilla/show_bug.cgi?id=4359>  */
-#if !(HAVE___FREADING && !defined __GLIBC__)
+#if !(HAVE___FREADING && (!defined __GLIBC__ || defined __UCLIBC__ || __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7)))
 
 bool
 freading (FILE *fp)
@@ -30,18 +31,44 @@ freading (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_ferror_unlocked     /* GNU libc, BeOS */
+# if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
   return ((fp->_flags & _IO_NO_WRITES) != 0
-         || ((fp->_flags & _IO_NO_READS) == 0
-             && (fp->_flags & _IO_CURRENTLY_PUTTING) == 0
-             && fp->_IO_read_base != NULL));
-#elif defined __sferror             /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
-  return (fp->_flags & __SRD) != 0;
-#elif defined _IOERR                /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
+          || ((fp->_flags & (_IO_NO_READS | _IO_CURRENTLY_PUTTING)) == 0
+              && fp->_IO_read_base != NULL));
+# elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin */
+  return (fp_->_flags & __SRD) != 0;
+# elif defined __EMX__               /* emx+gcc */
+  return (fp->_flags & _IOREAD) != 0;
+# elif defined __minix               /* Minix */
+  return (fp->_flags & _IOREADING) != 0;
+# elif defined _IOERR                /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, NonStop Kernel */
+#  if defined __sun                  /* Solaris */
+  return (fp->_flag & _IOREAD) != 0 && (fp->_flag & _IOWRT) == 0;
+#  else
   return (fp->_flag & _IOREAD) != 0;
-#else
- #error "Please port gnulib freading.c to your platform!"
-#endif
+#  endif
+# elif defined __UCLIBC__            /* uClibc */
+  return (fp->__modeflags & (__FLAG_READONLY | __FLAG_READING)) != 0;
+# elif defined __QNX__               /* QNX */
+  return ((fp->_Mode & 0x2 /* _MOPENW */) == 0
+          || (fp->_Mode & 0x1000 /* _MREAD */) != 0);
+# elif defined __MINT__              /* Atari FreeMiNT */
+  if (!fp->__mode.__write)
+    return 1;
+  if (!fp->__mode.__read)
+    return 0;
+#  ifdef _IO_CURRENTLY_GETTING /* Flag added on 2009-02-28 */
+  return (fp->__flags & _IO_CURRENTLY_GETTING) != 0;
+#  else
+  return (fp->__buffer < fp->__get_limit /*|| fp->__bufp == fp->__put_limit ??*/);
+#  endif
+# elif defined EPLAN9                /* Plan9 */
+  if (fp->state == 0 /* CLOSED */ || fp->state == 4 /* WR */)
+    return 0;
+  return (fp->state == 3 /* RD */ && (fp->bufl == 0 || fp->rp < fp->wp));
+# else
+#  error "Please port gnulib freading.c to your platform!"
+# endif
 }
 
 #endif