/* Retrieve information about a FILE stream.
- Copyright (C) 2007-2008 Free Software Foundation, Inc.
+ Copyright (C) 2007-2013 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
#include <stdlib.h>
+#include "stdio-impl.h"
+
const char *
freadptr (FILE *fp, size_t *sizep)
{
size_t size;
/* Keep this code in sync with freadahead! */
-#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 NULL;
size = fp->_IO_read_end - fp->_IO_read_ptr;
return NULL;
*sizep = size;
return (const char *) fp->_IO_read_ptr;
-#elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
- if ((fp->_flags & __SWR) != 0 || fp->_r < 0)
+#elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin */
+ if ((fp_->_flags & __SWR) != 0 || fp_->_r < 0)
return NULL;
- size = fp->_r;
+ size = fp_->_r;
if (size == 0)
return NULL;
*sizep = size;
- return (const char *) fp->_p;
+ return (const char *) fp_->_p;
#elif defined __EMX__ /* emx+gcc */
if ((fp->_flags & _IOWRT) != 0)
return NULL;
abort ();
*sizep = fp->_rcount;
return fp->_ptr;
-#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */
-# if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */
-# define fp_ ((struct { unsigned char *_ptr; \
- unsigned char *_base; \
- unsigned char *_end; \
- long _cnt; \
- int _file; \
- unsigned int _flag; \
- } *) fp)
- if ((fp_->_flag & _IOWRT) != 0)
+#elif defined __minix /* Minix */
+ if ((fp_->_flags & _IOWRITING) != 0)
return NULL;
- size = fp_->_cnt;
+ size = fp_->_count;
if (size == 0)
return NULL;
*sizep = size;
return (const char *) fp_->_ptr;
-# else
-# if defined _SCO_DS /* OpenServer */
-# define _flag __flag
-# define _ptr __ptr
-# define _cnt __cnt
-# endif
- if ((fp->_flag & _IOWRT) != 0)
- return NULL;
- size = fp->_cnt;
+#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, NonStop Kernel */
+ if ((fp_->_flag & _IOWRT) != 0)
+ return NULL;
+ size = fp_->_cnt;
if (size == 0)
return NULL;
*sizep = size;
- return (const char *) fp->_ptr;
-# endif
+ return (const char *) fp_->_ptr;
#elif defined __UCLIBC__ /* uClibc */
# ifdef __STDIO_BUFFERS
if (fp->__modeflags & __FLAG_WRITING)
return NULL;
*sizep = size;
return (const char *) fp->_Next;
+#elif defined __MINT__ /* Atari FreeMiNT */
+ if (!fp->__mode.__read)
+ return NULL;
+ size = fp->__get_limit - fp->__bufp;
+ if (size == 0)
+ return NULL;
+ *sizep = size;
+ return fp->__bufp;
+#elif defined EPLAN9 /* Plan9 */
+ if (fp->state == 4 /* WR */)
+ return NULL;
+ if (fp->rp >= fp->wp)
+ return NULL;
+ *sizep = fp->wp - fp->rp;
+ return fp->rp;
+#elif defined SLOW_BUT_NO_HACKS /* users can define this */
+ /* This implementation is correct on any ANSI C platform. It is just
+ awfully slow. */
+ return NULL;
#else
#error "Please port gnulib freadptr.c to your platform! Look at the definition of fflush, fread, getc, getc_unlocked on your system, then report this to bug-gnulib."
#endif