newlib-cygwin/newlib/libc/stdio/ftell.c

169 lines
4.3 KiB
C
Raw Normal View History

2000-02-18 03:39:52 +08:00
/*
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
FUNCTION
<<ftell>>, <<ftello>>---return position in a stream or file
2000-02-18 03:39:52 +08:00
INDEX
ftell
INDEX
ftello
2003-08-22 Jeff Johnston <jjohnstn@redhat.com> * libc/include/sys/reent.h: Add _GLOBAL_REENT macro. * libc/stdio: Globally remove/replace all references to fp->_data. Replace with _REENT or _GLOBAL_REENT where appropriate. * libc/stdio/asprintf.c: Ditto. * libc/stdio/fclose.c: Ditto. * libc/stdio/fvwrite.c: Ditto. * libc/stdio/makebuf.c: Ditto. * libc/stdio/refill.c: Ditto. * libc/stdio/local.h: Ditto. * libc/stdio/setvbuf.c: Ditto. * libc/stdio/sscanf.c: Ditto. * libc/stdio/stdio.c: Ditto. * libc/stdio/ungetc.c: Ditto. * libc/stdio/vfscanf.c: Ditto. * libc/stdio/vsscanf.c: Ditto. * libc/stdio/fopen.c: Ditto. Also use _fseek_r in _fopen_r. * libc/stdio/vasprintf.c: Ditto. Also call _vfprintf_r directly. * libc/stdio/vsnprintf.c: Ditto. * libc/stdio/vsprintf.c: Ditto. * libc/stdio/fcloseall.c(fcloseall): Use _GLOBAL_REENT macro instead of _REENT to walk file list. * libc/stdio/fflush.c: Ditto. * libc/stdio/fgetpos.c: Add reentrant version and have regular version call reentrant version with _REENT argument. * libc/stdio/fsetpos.c: Ditto. * libc/stdio/fseek.c: Ditto. * libc/stdio/fseeko.c: Ditto. * libc/stdio/ftell.c: Ditto. * libc/stdio/ftello.c: Ditto. * libc/stdio/freopen.c: Ditto. * libc/stdio/findfp.c: Use _GLOBAL_REENT pointer when adding new files to chain. Also use _GLOBAL_REENT pointer for cleaning up. * libc/stdio/fiprintf.c: Reformatted to minimize duplicate code. * libc/stdio/siprintf.c: Ditto. * libc/stdio/iprintf.c: Ditto. * libc/stdio/fprintf.c: Ditto. * libc/stdio/printf.c: Ditto. * libc/stdio/snprintf.c: Call _vfprintf_r directly. * libc/stdio/sprintf.c: Ditto. * libc/stdio/vprintf.c: Ditto. Also add _REENT_ONLY check. * libc/stdio/rewind.c: Call _fseek_r directly. * libc/stdio/tmpfile.c: Call _fopen_r and _remove_r directly. * libc/stdio/vfprintf.c (_VFPRINTF_R): Change _r routines to use data pointer. (get_arg): Add extra struct _reent pointer argument. * libc/stdio64/fgetpos64.c: Add _r versions, remove any reference to fp->_data. * libc/stdio64/fopen64.c: Ditto. * libc/stdio64/freopen64.c: Ditto. * libc/stdio64/fsetpos64.c: Ditto. * libc/stdio64/ftello64.c: Ditto. * libc/stdio64/local64.h: Ditto. * libc/stdio64/stdio64.c: Ditto. * libc/stdio64/fseeko64.c: Ditto plus use _fstat_r instead of _fstat64_r for the meantime.
2003-08-23 02:52:25 +08:00
INDEX
_ftell_r
INDEX
_ftello_r
2000-02-18 03:39:52 +08:00
ANSI_SYNOPSIS
#include <stdio.h>
long ftell(FILE *<[fp]>);
off_t ftello(FILE *<[fp]>);
2003-08-22 Jeff Johnston <jjohnstn@redhat.com> * libc/include/sys/reent.h: Add _GLOBAL_REENT macro. * libc/stdio: Globally remove/replace all references to fp->_data. Replace with _REENT or _GLOBAL_REENT where appropriate. * libc/stdio/asprintf.c: Ditto. * libc/stdio/fclose.c: Ditto. * libc/stdio/fvwrite.c: Ditto. * libc/stdio/makebuf.c: Ditto. * libc/stdio/refill.c: Ditto. * libc/stdio/local.h: Ditto. * libc/stdio/setvbuf.c: Ditto. * libc/stdio/sscanf.c: Ditto. * libc/stdio/stdio.c: Ditto. * libc/stdio/ungetc.c: Ditto. * libc/stdio/vfscanf.c: Ditto. * libc/stdio/vsscanf.c: Ditto. * libc/stdio/fopen.c: Ditto. Also use _fseek_r in _fopen_r. * libc/stdio/vasprintf.c: Ditto. Also call _vfprintf_r directly. * libc/stdio/vsnprintf.c: Ditto. * libc/stdio/vsprintf.c: Ditto. * libc/stdio/fcloseall.c(fcloseall): Use _GLOBAL_REENT macro instead of _REENT to walk file list. * libc/stdio/fflush.c: Ditto. * libc/stdio/fgetpos.c: Add reentrant version and have regular version call reentrant version with _REENT argument. * libc/stdio/fsetpos.c: Ditto. * libc/stdio/fseek.c: Ditto. * libc/stdio/fseeko.c: Ditto. * libc/stdio/ftell.c: Ditto. * libc/stdio/ftello.c: Ditto. * libc/stdio/freopen.c: Ditto. * libc/stdio/findfp.c: Use _GLOBAL_REENT pointer when adding new files to chain. Also use _GLOBAL_REENT pointer for cleaning up. * libc/stdio/fiprintf.c: Reformatted to minimize duplicate code. * libc/stdio/siprintf.c: Ditto. * libc/stdio/iprintf.c: Ditto. * libc/stdio/fprintf.c: Ditto. * libc/stdio/printf.c: Ditto. * libc/stdio/snprintf.c: Call _vfprintf_r directly. * libc/stdio/sprintf.c: Ditto. * libc/stdio/vprintf.c: Ditto. Also add _REENT_ONLY check. * libc/stdio/rewind.c: Call _fseek_r directly. * libc/stdio/tmpfile.c: Call _fopen_r and _remove_r directly. * libc/stdio/vfprintf.c (_VFPRINTF_R): Change _r routines to use data pointer. (get_arg): Add extra struct _reent pointer argument. * libc/stdio64/fgetpos64.c: Add _r versions, remove any reference to fp->_data. * libc/stdio64/fopen64.c: Ditto. * libc/stdio64/freopen64.c: Ditto. * libc/stdio64/fsetpos64.c: Ditto. * libc/stdio64/ftello64.c: Ditto. * libc/stdio64/local64.h: Ditto. * libc/stdio64/stdio64.c: Ditto. * libc/stdio64/fseeko64.c: Ditto plus use _fstat_r instead of _fstat64_r for the meantime.
2003-08-23 02:52:25 +08:00
long _ftell_r(struct _reent *<[ptr]>, FILE *<[fp]>);
off_t _ftello_r(struct _reent *<[ptr]>, FILE *<[fp]>);
2000-02-18 03:39:52 +08:00
TRAD_SYNOPSIS
#include <stdio.h>
long ftell(<[fp]>)
FILE *<[fp]>;
off_t ftello(<[fp]>)
FILE *<[fp]>;
2003-08-22 Jeff Johnston <jjohnstn@redhat.com> * libc/include/sys/reent.h: Add _GLOBAL_REENT macro. * libc/stdio: Globally remove/replace all references to fp->_data. Replace with _REENT or _GLOBAL_REENT where appropriate. * libc/stdio/asprintf.c: Ditto. * libc/stdio/fclose.c: Ditto. * libc/stdio/fvwrite.c: Ditto. * libc/stdio/makebuf.c: Ditto. * libc/stdio/refill.c: Ditto. * libc/stdio/local.h: Ditto. * libc/stdio/setvbuf.c: Ditto. * libc/stdio/sscanf.c: Ditto. * libc/stdio/stdio.c: Ditto. * libc/stdio/ungetc.c: Ditto. * libc/stdio/vfscanf.c: Ditto. * libc/stdio/vsscanf.c: Ditto. * libc/stdio/fopen.c: Ditto. Also use _fseek_r in _fopen_r. * libc/stdio/vasprintf.c: Ditto. Also call _vfprintf_r directly. * libc/stdio/vsnprintf.c: Ditto. * libc/stdio/vsprintf.c: Ditto. * libc/stdio/fcloseall.c(fcloseall): Use _GLOBAL_REENT macro instead of _REENT to walk file list. * libc/stdio/fflush.c: Ditto. * libc/stdio/fgetpos.c: Add reentrant version and have regular version call reentrant version with _REENT argument. * libc/stdio/fsetpos.c: Ditto. * libc/stdio/fseek.c: Ditto. * libc/stdio/fseeko.c: Ditto. * libc/stdio/ftell.c: Ditto. * libc/stdio/ftello.c: Ditto. * libc/stdio/freopen.c: Ditto. * libc/stdio/findfp.c: Use _GLOBAL_REENT pointer when adding new files to chain. Also use _GLOBAL_REENT pointer for cleaning up. * libc/stdio/fiprintf.c: Reformatted to minimize duplicate code. * libc/stdio/siprintf.c: Ditto. * libc/stdio/iprintf.c: Ditto. * libc/stdio/fprintf.c: Ditto. * libc/stdio/printf.c: Ditto. * libc/stdio/snprintf.c: Call _vfprintf_r directly. * libc/stdio/sprintf.c: Ditto. * libc/stdio/vprintf.c: Ditto. Also add _REENT_ONLY check. * libc/stdio/rewind.c: Call _fseek_r directly. * libc/stdio/tmpfile.c: Call _fopen_r and _remove_r directly. * libc/stdio/vfprintf.c (_VFPRINTF_R): Change _r routines to use data pointer. (get_arg): Add extra struct _reent pointer argument. * libc/stdio64/fgetpos64.c: Add _r versions, remove any reference to fp->_data. * libc/stdio64/fopen64.c: Ditto. * libc/stdio64/freopen64.c: Ditto. * libc/stdio64/fsetpos64.c: Ditto. * libc/stdio64/ftello64.c: Ditto. * libc/stdio64/local64.h: Ditto. * libc/stdio64/stdio64.c: Ditto. * libc/stdio64/fseeko64.c: Ditto plus use _fstat_r instead of _fstat64_r for the meantime.
2003-08-23 02:52:25 +08:00
long _ftell_r(<[ptr]>, <[fp]>)
struct _reent *<[ptr]>;
FILE *<[fp]>;
off_t _ftello_r(<[ptr]>, <[fp]>)
struct _reent *<[ptr]>;
FILE *<[fp]>;
2000-02-18 03:39:52 +08:00
DESCRIPTION
Objects of type <<FILE>> can have a ``position'' that records how much
of the file your program has already read. Many of the <<stdio>> functions
depend on this position, and many change it as a side effect.
The result of <<ftell>>/<<ftello>> is the current position for a file
2000-02-18 03:39:52 +08:00
identified by <[fp]>. If you record this result, you can later
use it with <<fseek>>/<<fseeko>> to return the file to this
position. The difference between <<ftell>> and <<ftello>> is that
<<ftell>> returns <<long>> and <<ftello>> returns <<off_t>>.
2000-02-18 03:39:52 +08:00
In the current implementation, <<ftell>>/<<ftello>> simply uses a character
2000-02-18 03:39:52 +08:00
count to represent the file position; this is the same number that
would be recorded by <<fgetpos>>.
RETURNS
<<ftell>>/<<ftello>> return the file position, if possible. If they cannot do
this, they return <<-1L>>. Failure occurs on streams that do not support
2000-02-18 03:39:52 +08:00
positioning; the global <<errno>> indicates this condition with the
value <<ESPIPE>>.
PORTABILITY
<<ftell>> is required by the ANSI C standard, but the meaning of its
result (when successful) is not specified beyond requiring that it be
acceptable as an argument to <<fseek>>. In particular, other
conforming C implementations may return a different result from
<<ftell>> than what <<fgetpos>> records.
<<ftello>> is defined by the Single Unix specification.
2000-02-18 03:39:52 +08:00
No supporting OS subroutines are required.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "%W% (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */
/*
* ftell: return current offset.
*/
#include <stdio.h>
#include <errno.h>
#include "local.h"
long
2003-08-22 Jeff Johnston <jjohnstn@redhat.com> * libc/include/sys/reent.h: Add _GLOBAL_REENT macro. * libc/stdio: Globally remove/replace all references to fp->_data. Replace with _REENT or _GLOBAL_REENT where appropriate. * libc/stdio/asprintf.c: Ditto. * libc/stdio/fclose.c: Ditto. * libc/stdio/fvwrite.c: Ditto. * libc/stdio/makebuf.c: Ditto. * libc/stdio/refill.c: Ditto. * libc/stdio/local.h: Ditto. * libc/stdio/setvbuf.c: Ditto. * libc/stdio/sscanf.c: Ditto. * libc/stdio/stdio.c: Ditto. * libc/stdio/ungetc.c: Ditto. * libc/stdio/vfscanf.c: Ditto. * libc/stdio/vsscanf.c: Ditto. * libc/stdio/fopen.c: Ditto. Also use _fseek_r in _fopen_r. * libc/stdio/vasprintf.c: Ditto. Also call _vfprintf_r directly. * libc/stdio/vsnprintf.c: Ditto. * libc/stdio/vsprintf.c: Ditto. * libc/stdio/fcloseall.c(fcloseall): Use _GLOBAL_REENT macro instead of _REENT to walk file list. * libc/stdio/fflush.c: Ditto. * libc/stdio/fgetpos.c: Add reentrant version and have regular version call reentrant version with _REENT argument. * libc/stdio/fsetpos.c: Ditto. * libc/stdio/fseek.c: Ditto. * libc/stdio/fseeko.c: Ditto. * libc/stdio/ftell.c: Ditto. * libc/stdio/ftello.c: Ditto. * libc/stdio/freopen.c: Ditto. * libc/stdio/findfp.c: Use _GLOBAL_REENT pointer when adding new files to chain. Also use _GLOBAL_REENT pointer for cleaning up. * libc/stdio/fiprintf.c: Reformatted to minimize duplicate code. * libc/stdio/siprintf.c: Ditto. * libc/stdio/iprintf.c: Ditto. * libc/stdio/fprintf.c: Ditto. * libc/stdio/printf.c: Ditto. * libc/stdio/snprintf.c: Call _vfprintf_r directly. * libc/stdio/sprintf.c: Ditto. * libc/stdio/vprintf.c: Ditto. Also add _REENT_ONLY check. * libc/stdio/rewind.c: Call _fseek_r directly. * libc/stdio/tmpfile.c: Call _fopen_r and _remove_r directly. * libc/stdio/vfprintf.c (_VFPRINTF_R): Change _r routines to use data pointer. (get_arg): Add extra struct _reent pointer argument. * libc/stdio64/fgetpos64.c: Add _r versions, remove any reference to fp->_data. * libc/stdio64/fopen64.c: Ditto. * libc/stdio64/freopen64.c: Ditto. * libc/stdio64/fsetpos64.c: Ditto. * libc/stdio64/ftello64.c: Ditto. * libc/stdio64/local64.h: Ditto. * libc/stdio64/stdio64.c: Ditto. * libc/stdio64/fseeko64.c: Ditto plus use _fstat_r instead of _fstat64_r for the meantime.
2003-08-23 02:52:25 +08:00
_DEFUN (_ftell_r, (ptr, fp),
struct _reent *ptr _AND
2000-02-18 03:39:52 +08:00
register FILE * fp)
{
_fpos_t pos;
2000-02-18 03:39:52 +08:00
_flockfile(fp);
2000-02-18 03:39:52 +08:00
/* Ensure stdio is set up. */
CHECK_INIT (fp);
if (fp->_seek == NULL)
{
2003-08-22 Jeff Johnston <jjohnstn@redhat.com> * libc/include/sys/reent.h: Add _GLOBAL_REENT macro. * libc/stdio: Globally remove/replace all references to fp->_data. Replace with _REENT or _GLOBAL_REENT where appropriate. * libc/stdio/asprintf.c: Ditto. * libc/stdio/fclose.c: Ditto. * libc/stdio/fvwrite.c: Ditto. * libc/stdio/makebuf.c: Ditto. * libc/stdio/refill.c: Ditto. * libc/stdio/local.h: Ditto. * libc/stdio/setvbuf.c: Ditto. * libc/stdio/sscanf.c: Ditto. * libc/stdio/stdio.c: Ditto. * libc/stdio/ungetc.c: Ditto. * libc/stdio/vfscanf.c: Ditto. * libc/stdio/vsscanf.c: Ditto. * libc/stdio/fopen.c: Ditto. Also use _fseek_r in _fopen_r. * libc/stdio/vasprintf.c: Ditto. Also call _vfprintf_r directly. * libc/stdio/vsnprintf.c: Ditto. * libc/stdio/vsprintf.c: Ditto. * libc/stdio/fcloseall.c(fcloseall): Use _GLOBAL_REENT macro instead of _REENT to walk file list. * libc/stdio/fflush.c: Ditto. * libc/stdio/fgetpos.c: Add reentrant version and have regular version call reentrant version with _REENT argument. * libc/stdio/fsetpos.c: Ditto. * libc/stdio/fseek.c: Ditto. * libc/stdio/fseeko.c: Ditto. * libc/stdio/ftell.c: Ditto. * libc/stdio/ftello.c: Ditto. * libc/stdio/freopen.c: Ditto. * libc/stdio/findfp.c: Use _GLOBAL_REENT pointer when adding new files to chain. Also use _GLOBAL_REENT pointer for cleaning up. * libc/stdio/fiprintf.c: Reformatted to minimize duplicate code. * libc/stdio/siprintf.c: Ditto. * libc/stdio/iprintf.c: Ditto. * libc/stdio/fprintf.c: Ditto. * libc/stdio/printf.c: Ditto. * libc/stdio/snprintf.c: Call _vfprintf_r directly. * libc/stdio/sprintf.c: Ditto. * libc/stdio/vprintf.c: Ditto. Also add _REENT_ONLY check. * libc/stdio/rewind.c: Call _fseek_r directly. * libc/stdio/tmpfile.c: Call _fopen_r and _remove_r directly. * libc/stdio/vfprintf.c (_VFPRINTF_R): Change _r routines to use data pointer. (get_arg): Add extra struct _reent pointer argument. * libc/stdio64/fgetpos64.c: Add _r versions, remove any reference to fp->_data. * libc/stdio64/fopen64.c: Ditto. * libc/stdio64/freopen64.c: Ditto. * libc/stdio64/fsetpos64.c: Ditto. * libc/stdio64/ftello64.c: Ditto. * libc/stdio64/local64.h: Ditto. * libc/stdio64/stdio64.c: Ditto. * libc/stdio64/fseeko64.c: Ditto plus use _fstat_r instead of _fstat64_r for the meantime.
2003-08-23 02:52:25 +08:00
ptr->_errno = ESPIPE;
_funlockfile(fp);
2000-02-18 03:39:52 +08:00
return -1L;
}
/* Find offset of underlying I/O object, then
adjust for buffered bytes. */
fflush(fp); /* may adjust seek offset on append stream */
if (fp->_flags & __SOFF)
pos = fp->_offset;
else
{
pos = (*fp->_seek) (fp->_cookie, (_fpos_t) 0, SEEK_CUR);
2000-02-18 03:39:52 +08:00
if (pos == -1L)
{
_funlockfile(fp);
return pos;
}
2000-02-18 03:39:52 +08:00
}
if (fp->_flags & __SRD)
{
/*
* Reading. Any unread characters (including
* those from ungetc) cause the position to be
* smaller than that in the underlying object.
*/
pos -= fp->_r;
if (HASUB (fp))
pos -= fp->_ur;
}
else if (fp->_flags & __SWR && fp->_p != NULL)
{
/*
* Writing. Any buffered characters cause the
* position to be greater than that in the
* underlying object.
*/
pos += fp->_p - fp->_bf._base;
}
_funlockfile(fp);
2000-02-18 03:39:52 +08:00
return pos;
}
2003-08-22 Jeff Johnston <jjohnstn@redhat.com> * libc/include/sys/reent.h: Add _GLOBAL_REENT macro. * libc/stdio: Globally remove/replace all references to fp->_data. Replace with _REENT or _GLOBAL_REENT where appropriate. * libc/stdio/asprintf.c: Ditto. * libc/stdio/fclose.c: Ditto. * libc/stdio/fvwrite.c: Ditto. * libc/stdio/makebuf.c: Ditto. * libc/stdio/refill.c: Ditto. * libc/stdio/local.h: Ditto. * libc/stdio/setvbuf.c: Ditto. * libc/stdio/sscanf.c: Ditto. * libc/stdio/stdio.c: Ditto. * libc/stdio/ungetc.c: Ditto. * libc/stdio/vfscanf.c: Ditto. * libc/stdio/vsscanf.c: Ditto. * libc/stdio/fopen.c: Ditto. Also use _fseek_r in _fopen_r. * libc/stdio/vasprintf.c: Ditto. Also call _vfprintf_r directly. * libc/stdio/vsnprintf.c: Ditto. * libc/stdio/vsprintf.c: Ditto. * libc/stdio/fcloseall.c(fcloseall): Use _GLOBAL_REENT macro instead of _REENT to walk file list. * libc/stdio/fflush.c: Ditto. * libc/stdio/fgetpos.c: Add reentrant version and have regular version call reentrant version with _REENT argument. * libc/stdio/fsetpos.c: Ditto. * libc/stdio/fseek.c: Ditto. * libc/stdio/fseeko.c: Ditto. * libc/stdio/ftell.c: Ditto. * libc/stdio/ftello.c: Ditto. * libc/stdio/freopen.c: Ditto. * libc/stdio/findfp.c: Use _GLOBAL_REENT pointer when adding new files to chain. Also use _GLOBAL_REENT pointer for cleaning up. * libc/stdio/fiprintf.c: Reformatted to minimize duplicate code. * libc/stdio/siprintf.c: Ditto. * libc/stdio/iprintf.c: Ditto. * libc/stdio/fprintf.c: Ditto. * libc/stdio/printf.c: Ditto. * libc/stdio/snprintf.c: Call _vfprintf_r directly. * libc/stdio/sprintf.c: Ditto. * libc/stdio/vprintf.c: Ditto. Also add _REENT_ONLY check. * libc/stdio/rewind.c: Call _fseek_r directly. * libc/stdio/tmpfile.c: Call _fopen_r and _remove_r directly. * libc/stdio/vfprintf.c (_VFPRINTF_R): Change _r routines to use data pointer. (get_arg): Add extra struct _reent pointer argument. * libc/stdio64/fgetpos64.c: Add _r versions, remove any reference to fp->_data. * libc/stdio64/fopen64.c: Ditto. * libc/stdio64/freopen64.c: Ditto. * libc/stdio64/fsetpos64.c: Ditto. * libc/stdio64/ftello64.c: Ditto. * libc/stdio64/local64.h: Ditto. * libc/stdio64/stdio64.c: Ditto. * libc/stdio64/fseeko64.c: Ditto plus use _fstat_r instead of _fstat64_r for the meantime.
2003-08-23 02:52:25 +08:00
#ifndef _REENT_ONLY
long
_DEFUN (ftell, (fp),
register FILE * fp)
{
return _ftell_r (_REENT, fp);
}
#endif /* !_REENT_ONLY */