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[gnulib.git] / lib / freadahead.c

diff --git a/lib/freadahead.c b/lib/freadahead.c
index 610de87..01b0810 100644 (file)
--- a/lib/freadahead.c
+++ b/lib/freadahead.c
@@ -1,5 +1,5 @@
 /* Retrieve information about a FILE stream.
-   Copyright (C) 2007-2008 Free Software Foundation, Inc.
+   Copyright (C) 2007-2014 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
@@ -19,22 +19,27 @@
 /* Specification.  */
 #include "freadahead.h"
 
+#include <stdlib.h>
 #include "stdio-impl.h"
 
 size_t
 freadahead (FILE *fp)
 {
-#if defined _IO_ferror_unlocked || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Linux libc5 */
+#if 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 */
+         + (fp->_flags & _IO_IN_BACKUP ? fp->_IO_save_end - fp->_IO_save_base :
+            0);
+#elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin */
   if ((fp_->_flags & __SWR) != 0 || fp_->_r < 0)
     return 0;
+# if defined __DragonFly__
+  return __sreadahead (fp);
+# else
   return fp_->_r
-        + (HASUB (fp) ? fp_->_ur : 0);
+         + (HASUB (fp) ? fp_->_ur : 0);
+# endif
 #elif defined __EMX__               /* emx+gcc */
   if ((fp->_flags & _IOWRT) != 0)
     return 0;
@@ -43,7 +48,11 @@ freadahead (FILE *fp)
   /* 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 */
+#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, mingw, NonStop Kernel */
   if ((fp_->_flag & _IOWRT) != 0)
     return 0;
   return fp_->_cnt;
@@ -52,7 +61,7 @@ freadahead (FILE *fp)
   if (fp->__modeflags & __FLAG_WRITING)
     return 0;
   return (fp->__bufread - fp->__bufpos)
-        + (fp->__modeflags & __FLAG_UNGOT ? 1 : 0);
+         + (fp->__modeflags & __FLAG_UNGOT ? 1 : 0);
 # else
   return 0;
 # endif
@@ -62,9 +71,22 @@ freadahead (FILE *fp)
   /* fp->_Buf <= fp->_Next <= fp->_Rend,
      and fp->_Rend may be overridden by fp->_Rsave. */
   return ((fp->_Rsave ? fp->_Rsave : fp->_Rend) - fp->_Next)
-        + (fp->_Mode & 0x4000 /* _MBYTE */
-           ? (fp->_Back + sizeof (fp->_Back)) - fp->_Rback
-           : 0);
+         + (fp->_Mode & 0x4000 /* _MBYTE */
+            ? (fp->_Back + sizeof (fp->_Back)) - fp->_Rback
+            : 0);
+#elif defined __MINT__              /* Atari FreeMiNT */
+  if (!fp->__mode.__read)
+    return 0;
+  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;
 #else
  #error "Please port gnulib freadahead.c to your platform! Look at the definition of fflush, fread, ungetc on your system, then report this to bug-gnulib."
 #endif