-/* An fseek() function that, together with fflush(), is POSIX compliant.
- Copyright (C) 2007 Free Software Foundation, Inc.
+/* An fseeko() function that, together with fflush(), is POSIX compliant.
+ Copyright (C) 2007-2011 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
/* Get off_t and lseek. */
#include <unistd.h>
+#include "stdio-impl.h"
+
+int
+fseeko (FILE *fp, off_t offset, int whence)
#undef fseeko
#if !HAVE_FSEEKO
+# undef fseek
# define fseeko fseek
#endif
-
-int
-rpl_fseeko (FILE *fp, off_t offset, int whence)
{
+#if LSEEK_PIPE_BROKEN
+ /* mingw gives bogus answers rather than failure on non-seekable files. */
+ if (lseek (fileno (fp), 0, SEEK_CUR) == -1)
+ return EOF;
+#endif
+
/* These tests are based on fpurge.c. */
-#if defined _IO_ferror_unlocked /* GNU libc, BeOS */
+#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
if (fp->_IO_read_end == fp->_IO_read_ptr
&& fp->_IO_write_ptr == fp->_IO_write_base
&& fp->_IO_save_base == NULL)
-#elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
-# if defined __NetBSD__ || defined __OpenBSD__ /* NetBSD, OpenBSD */
- /* See <http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup>
- and <http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup> */
-# define fp_ub ((struct { struct __sbuf _ub; } *) fp->_ext._base)->_ub
-# else /* FreeBSD, MacOS X, Cygwin */
-# define fp_ub fp->_ub
+#elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
+# if defined __SL64 && defined __SCLE /* Cygwin */
+ if ((fp->_flags & __SL64) == 0)
+ {
+ /* Cygwin 1.5.0 through 1.5.24 failed to open stdin in 64-bit
+ mode; but has an fseeko that requires 64-bit mode. */
+ FILE *tmp = fopen ("/dev/null", "r");
+ if (!tmp)
+ return -1;
+ fp->_flags |= __SL64;
+ fp->_seek64 = tmp->_seek64;
+ fclose (tmp);
+ }
# endif
- if (fp->_p == fp->_bf._base
- && fp->_r == 0
- && fp->_w == ((fp->_flags & (__SLBF | __SNBF)) == 0 /* fully buffered? */
- ? fp->_bf._size
- : 0)
+ if (fp_->_p == fp_->_bf._base
+ && fp_->_r == 0
+ && fp_->_w == ((fp_->_flags & (__SLBF | __SNBF | __SRD)) == 0 /* fully buffered and not currently reading? */
+ ? fp_->_bf._size
+ : 0)
&& fp_ub._base == NULL)
-#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
-# if defined __sun && defined __sparc && defined _LP64 /* Solaris/SPARC 64-bit */
-# define fp_ ((struct { unsigned char *_ptr; \
- unsigned char *_base; \
- unsigned char *_end; \
- long _cnt; \
- } *) fp)
+#elif defined __EMX__ /* emx+gcc */
+ if (fp->_ptr == fp->_buffer
+ && fp->_rcount == 0
+ && fp->_wcount == 0
+ && fp->_ungetc_count == 0)
+#elif defined __minix /* Minix */
+ if (fp_->_ptr == fp_->_buf
+ && (fp_->_ptr == NULL || fp_->_count == 0))
+#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, NonStop Kernel */
if (fp_->_ptr == fp_->_base
&& (fp_->_ptr == NULL || fp_->_cnt == 0))
-# else
- if (fp->_ptr == fp->_base
- && (fp->_ptr == NULL || fp->_cnt == 0))
-# endif
+#elif defined __UCLIBC__ /* uClibc */
+ if (((fp->__modeflags & __FLAG_WRITING) == 0
+ || fp->__bufpos == fp->__bufstart)
+ && ((fp->__modeflags & (__FLAG_READONLY | __FLAG_READING)) == 0
+ || fp->__bufpos == fp->__bufread))
+#elif defined __QNX__ /* QNX */
+ if ((fp->_Mode & 0x2000 /* _MWRITE */ ? fp->_Next == fp->_Buf : fp->_Next == fp->_Rend)
+ && fp->_Rback == fp->_Back + sizeof (fp->_Back)
+ && fp->_Rsave == NULL)
+#elif defined __MINT__ /* Atari FreeMiNT */
+ if (fp->__bufp == fp->__buffer
+ && fp->__get_limit == fp->__bufp
+ && fp->__put_limit == fp->__bufp
+ && !fp->__pushed_back)
#else
#error "Please port gnulib fseeko.c to your platform! Look at the code in fpurge.c, then report this to bug-gnulib."
#endif
{
+ /* We get here when an fflush() call immediately preceded this one (or
+ if ftell() has created buffers but no I/O has occurred on a
+ newly-opened stream). We know there are no buffers. */
off_t pos = lseek (fileno (fp), offset, whence);
if (pos == -1)
- {
-#if defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
- fp->_flags &= ~__SOFF;
+ {
+#if defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
+ fp_->_flags &= ~__SOFF;
#endif
- return -1;
- }
- else
- {
-#if defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
- fp->_offset = pos;
- fp->_flags |= __SOFF;
+ return -1;
+ }
+
+#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+ fp->_flags &= ~_IO_EOF_SEEN;
+ fp->_offset = pos;
+#elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
+# if defined __CYGWIN__
+ /* fp_->_offset is typed as an integer. */
+ fp_->_offset = pos;
+# else
+ /* fp_->_offset is an fpos_t. */
+ {
+ /* Use a union, since on NetBSD, the compilation flags
+ determine whether fpos_t is typedef'd to off_t or a struct
+ containing a single off_t member. */
+ union
+ {
+ fpos_t f;
+ off_t o;
+ } u;
+ u.o = pos;
+ fp_->_offset = u.f;
+ }
+# endif
+ fp_->_flags |= __SOFF;
+ fp_->_flags &= ~__SEOF;
+#elif defined __EMX__ /* emx+gcc */
+ fp->_flags &= ~_IOEOF;
+#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, NonStop Kernel */
+ fp->_flag &= ~_IOEOF;
+#elif defined __MINT__ /* Atari FreeMiNT */
+ fp->__offset = pos;
+ fp->__eof = 0;
#endif
- return 0;
- }
+ return 0;
}
- else
- return fseeko (fp, offset, whence);
+ return fseeko (fp, offset, whence);
}
projects / gnulib.git / blobdiff