XCU5: Add fseeko() and ftello() functions which provide the functionality of
fseek() and ftell(), respectively, but operate on file offsets of type off_t.
This commit is contained in:
kleink
parent
2f244ea9d9
commit
dae360611f
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@ -1,4 +1,4 @@
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/* $NetBSD: stdio.h,v 1.33 2000/06/26 15:52:36 kleink Exp $ */
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/* $NetBSD: stdio.h,v 1.34 2000/07/08 13:46:33 kleink Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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@ -328,6 +328,20 @@ char *tempnam __P((const char *, const char *));
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__END_DECLS
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#endif
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/*
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* X/Open CAE Specification Issue 5 Version 2
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*/
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#if (!defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE)) || \
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(_XOPEN_SOURCE - 0) >= 500 || defined(_LARGEFILE_SOURCE)
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#ifndef off_t
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typedef __off_t off_t;
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#define off_t off_t
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#endif 7* off_t */
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int fseeko __P((FILE *, off_t, int));
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off_t ftello __P((FILE *));
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#endif /* (!_POSIX_SOURCE && !_XOPEN_SOURCE) || ... */
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/*
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* Routines that are purely local.
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*/
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@ -1,4 +1,4 @@
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/* $NetBSD: namespace.h,v 1.56 2000/07/05 12:03:50 kleink Exp $ */
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/* $NetBSD: namespace.h,v 1.57 2000/07/08 13:46:34 kleink Exp $ */
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/*-
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* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
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@ -45,6 +45,8 @@
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#define err _err
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#define errx _errx
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#define fork _fork
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#define fseeko _fseeko
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#define ftello _ftello
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#define inet_aton _inet_aton
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#define inet_pton _inet_pton
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#define sbrk _sbrk
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@ -1,4 +1,4 @@
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# $NetBSD: shlib_version,v 1.92 2000/07/05 16:08:28 veego Exp $
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# $NetBSD: shlib_version,v 1.93 2000/07/08 13:46:34 kleink Exp $
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# Remember to update distrib/sets/lists/base/shl.* when changing
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#
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# things we wish to do on next major version bump:
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@ -6,4 +6,4 @@
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# - libc/net: resolver update to BIND8/9?
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#
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major=12
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minor=63
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minor=64
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@ -1,5 +1,5 @@
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# from: @(#)Makefile.inc 5.7 (Berkeley) 6/27/91
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# $NetBSD: Makefile.inc,v 1.18 1998/08/30 23:29:18 perry Exp $
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# $NetBSD: Makefile.inc,v 1.19 2000/07/08 13:46:35 kleink Exp $
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# stdio sources
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.PATH: ${.CURDIR}/stdio
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@ -9,10 +9,10 @@ CPPFLAGS+=-DFLOATING_POINT
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SRCS+= asprintf.c clrerr.c fclose.c fdopen.c feof.c ferror.c fflush.c \
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fgetc.c fgetln.c fgetpos.c fgets.c fileno.c findfp.c flags.c \
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fopen.c fprintf.c fpurge.c fputc.c fputs.c fread.c freopen.c \
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fscanf.c fseek.c fsetpos.c ftell.c funopen.c fvwrite.c \
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fwalk.c fwrite.c getc.c getchar.c gettemp.c getw.c makebuf.c \
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mkdtemp.c mkstemp.c perror.c printf.c putc.c putchar.c puts.c \
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putw.c refill.c remove.c rewind.c rget.c scanf.c setbuf.c \
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fscanf.c fseek.c fseeko.c fsetpos.c ftell.c ftello.c funopen.c \
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fvwrite.c fwalk.c fwrite.c getc.c getchar.c gettemp.c getw.c \
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makebuf.c mkdtemp.c mkstemp.c perror.c printf.c putc.c putchar.c \
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puts.c putw.c refill.c remove.c rewind.c rget.c scanf.c setbuf.c \
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setbuffer.c setvbuf.c snprintf.c sscanf.c stdio.c tmpfile.c \
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ungetc.c vasprintf.c vfprintf.c vfscanf.c vprintf.c vscanf.c \
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vsnprintf.c vsscanf.c wbuf.c wsetup.c
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@ -21,6 +21,9 @@ SRCS+= asprintf.c clrerr.c fclose.c fdopen.c feof.c ferror.c fflush.c \
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SRCS+= gets.c sprintf.c vsprintf.c tempnam.c tmpnam.c mktemp.c
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.endif
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# namespace purity wrappers
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SRCS+= _fseeko.c _ftello.c
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MAN+= fclose.3 ferror.3 fflush.3 fgetln.3 fgets.3 fopen.3 fputs.3 \
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fread.3 fseek.3 funopen.3 getc.3 mktemp.3 perror.3 printf.3 putc.3 \
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remove.3 scanf.3 setbuf.3 stdio.3 tmpnam.3 ungetc.3
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@ -31,7 +34,8 @@ MLINKS+=fgets.3 gets.3
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MLINKS+=fopen.3 fdopen.3 fopen.3 freopen.3
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MLINKS+=fputs.3 puts.3
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MLINKS+=fread.3 fwrite.3
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MLINKS+=fseek.3 fgetpos.3 fseek.3 fsetpos.3 fseek.3 ftell.3 fseek.3 rewind.3
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MLINKS+=fseek.3 fgetpos.3 fseek.3 fseeko.3 fseek.3 fsetpos.3 fseek.3 ftell.3 \
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fseek.3 ftello.3 fseek.3 rewind.3
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MLINKS+=funopen.3 fropen.3 funopen.3 fwopen.3
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MLINKS+=getc.3 fgetc.3 getc.3 getchar.3 getc.3 getw.3
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MLINKS+=mktemp.3 mkdtemp.3 mktemp.3 mkstemp.3
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@ -0,0 +1,49 @@
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/* $NetBSD: _fseeko.c,v 1.1 2000/07/08 13:46:35 kleink Exp $ */
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/*
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* Copyright (c) 1996 Christos Zoulas. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Christos Zoulas.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifdef __indr_reference
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__indr_reference(_fseeko, fseeko)
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#else
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#include <stdio.h>
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int _fseeko __P((FILE *, off_t, int)); /* XXX */
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int
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fseeko(stream, offset, whence)
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FILE *stream;
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off_t offset;
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int whence;
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{
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return _fseeko(stream, offset, whence);
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}
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#endif
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@ -0,0 +1,47 @@
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/* $NetBSD: _ftello.c,v 1.1 2000/07/08 13:46:35 kleink Exp $ */
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/*
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* Copyright (c) 1996 Christos Zoulas. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Christos Zoulas.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifdef __indr_reference
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__indr_reference(_ftello, ftello)
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#else
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#include <stdio.h>
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off_t _ftello __P((FILE *)); /* XXX */
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off_t
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ftello(stream)
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FILE *stream;
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{
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return _ftello(stream);
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}
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#endif
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@ -1,4 +1,4 @@
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.\" $NetBSD: fseek.3,v 1.12 1999/03/08 10:27:34 kleink Exp $
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.\" $NetBSD: fseek.3,v 1.13 2000/07/08 13:46:35 kleink Exp $
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.\"
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.\" Copyright (c) 1990, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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@ -43,8 +43,10 @@
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.Sh NAME
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.Nm fgetpos ,
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.Nm fseek ,
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.Nm fseeko ,
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.Nm fsetpos ,
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.Nm ftell ,
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.Nm ftello ,
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.Nm rewind
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.Nd reposition a stream
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.Sh LIBRARY
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@ -53,8 +55,12 @@
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.Fd #include <stdio.h>
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.Ft int
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.Fn fseek "FILE *stream" "long offset" "int whence"
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.Ft int
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.Fn fseeko "FILE *stream" "off_t offset" "int whence"
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.Ft long
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.Fn ftell "FILE *stream"
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.Ft off_t
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.Fn ftell "FILE *stream"
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.Ft void
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.Fn rewind "FILE *stream"
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.Ft int
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@ -197,3 +203,9 @@ and
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functions
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conform to
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.St -ansiC .
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The
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.Fn fseeko
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and
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.Fn ftello
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functions conform to
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.St -xcu5 .
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@ -0,0 +1,271 @@
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/* $NetBSD: fseeko.c,v 1.1 2000/07/08 13:46:35 kleink Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: fseeko.c,v 1.1 2000/07/08 13:46:35 kleink Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "local.h"
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#include "reentrant.h"
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#define POS_ERR (-(fpos_t)1)
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/*
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* Seek the given file to the given offset.
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* `Whence' must be one of the three SEEK_* macros.
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*/
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int
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fseeko(fp, offset, whence)
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FILE *fp;
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off_t offset;
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int whence;
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{
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fpos_t (*seekfn) __P((void *, fpos_t, int));
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fpos_t target, curoff;
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size_t n;
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struct stat st;
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int havepos;
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_DIAGASSERT(fp != NULL);
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#ifdef __GNUC__
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/* This outrageous construct just to shut up a GCC warning. */
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(void) &curoff;
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#endif
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/* make sure stdio is set up */
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if (!__sdidinit)
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__sinit();
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FLOCKFILE(fp);
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/*
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* Have to be able to seek.
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*/
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if ((seekfn = fp->_seek) == NULL) {
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errno = ESPIPE; /* historic practice */
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FUNLOCKFILE(fp);
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return (-1);
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}
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/*
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* Change any SEEK_CUR to SEEK_SET, and check `whence' argument.
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* After this, whence is either SEEK_SET or SEEK_END.
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*/
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switch (whence) {
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case SEEK_CUR:
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/*
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* In order to seek relative to the current stream offset,
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* we have to first find the current stream offset a la
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* ftell (see ftell for details).
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*/
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__sflush(fp); /* may adjust seek offset on append stream */
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if (fp->_flags & __SOFF)
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curoff = fp->_offset;
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else {
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curoff = (*seekfn)(fp->_cookie, (fpos_t)0, SEEK_CUR);
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if (curoff == POS_ERR) {
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FUNLOCKFILE(fp);
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return (-1);
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}
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}
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if (fp->_flags & __SRD) {
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curoff -= fp->_r;
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if (HASUB(fp))
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curoff -= fp->_ur;
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} else if (fp->_flags & __SWR && fp->_p != NULL)
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curoff += fp->_p - fp->_bf._base;
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offset += curoff;
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whence = SEEK_SET;
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havepos = 1;
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break;
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case SEEK_SET:
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case SEEK_END:
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curoff = 0; /* XXX just to keep gcc quiet */
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havepos = 0;
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break;
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default:
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errno = EINVAL;
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FUNLOCKFILE(fp);
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return (-1);
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}
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/*
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* Can only optimise if:
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* reading (and not reading-and-writing);
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* not unbuffered; and
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* this is a `regular' Unix file (and hence seekfn==__sseek).
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* We must check __NBF first, because it is possible to have __NBF
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* and __SOPT both set.
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*/
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if (fp->_bf._base == NULL)
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__smakebuf(fp);
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if (fp->_flags & (__SWR | __SRW | __SNBF | __SNPT))
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goto dumb;
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if ((fp->_flags & __SOPT) == 0) {
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if (seekfn != __sseek ||
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fp->_file < 0 || fstat(fp->_file, &st) ||
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!S_ISREG(st.st_mode)) {
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fp->_flags |= __SNPT;
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goto dumb;
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}
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fp->_blksize = st.st_blksize;
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fp->_flags |= __SOPT;
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}
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/*
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* We are reading; we can try to optimise.
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* Figure out where we are going and where we are now.
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*/
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if (whence == SEEK_SET)
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target = offset;
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else {
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if (fstat(fp->_file, &st))
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goto dumb;
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target = st.st_size + offset;
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}
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if (!havepos) {
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if (fp->_flags & __SOFF)
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curoff = fp->_offset;
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else {
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curoff = (*seekfn)(fp->_cookie, (fpos_t)0, SEEK_CUR);
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if (curoff == POS_ERR)
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goto dumb;
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}
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curoff -= fp->_r;
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if (HASUB(fp))
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curoff -= fp->_ur;
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}
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/*
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* Compute the number of bytes in the input buffer (pretending
|
||||
* that any ungetc() input has been discarded). Adjust current
|
||||
* offset backwards by this count so that it represents the
|
||||
* file offset for the first byte in the current input buffer.
|
||||
*/
|
||||
if (HASUB(fp)) {
|
||||
curoff += fp->_r; /* kill off ungetc */
|
||||
n = fp->_up - fp->_bf._base;
|
||||
curoff -= n;
|
||||
n += fp->_ur;
|
||||
} else {
|
||||
n = fp->_p - fp->_bf._base;
|
||||
curoff -= n;
|
||||
n += fp->_r;
|
||||
}
|
||||
|
||||
/*
|
||||
* If the target offset is within the current buffer,
|
||||
* simply adjust the pointers, clear EOF, undo ungetc(),
|
||||
* and return. (If the buffer was modified, we have to
|
||||
* skip this; see fgetln.c.)
|
||||
*/
|
||||
if ((fp->_flags & __SMOD) == 0 &&
|
||||
target >= curoff && target < curoff + n) {
|
||||
int o = (int)(target - curoff);
|
||||
|
||||
fp->_p = fp->_bf._base + o;
|
||||
fp->_r = n - o;
|
||||
if (HASUB(fp))
|
||||
FREEUB(fp);
|
||||
fp->_flags &= ~__SEOF;
|
||||
FUNLOCKFILE(fp);
|
||||
return (0);
|
||||
}
|
||||
|
||||
/*
|
||||
* The place we want to get to is not within the current buffer,
|
||||
* but we can still be kind to the kernel copyout mechanism.
|
||||
* By aligning the file offset to a block boundary, we can let
|
||||
* the kernel use the VM hardware to map pages instead of
|
||||
* copying bytes laboriously. Using a block boundary also
|
||||
* ensures that we only read one block, rather than two.
|
||||
*/
|
||||
curoff = target & ~(fp->_blksize - 1);
|
||||
if ((*seekfn)(fp->_cookie, curoff, SEEK_SET) == POS_ERR)
|
||||
goto dumb;
|
||||
fp->_r = 0;
|
||||
fp->_p = fp->_bf._base;
|
||||
if (HASUB(fp))
|
||||
FREEUB(fp);
|
||||
fp->_flags &= ~__SEOF;
|
||||
n = (int)(target - curoff);
|
||||
if (n) {
|
||||
if (__srefill(fp) || fp->_r < n)
|
||||
goto dumb;
|
||||
fp->_p += n;
|
||||
fp->_r -= n;
|
||||
}
|
||||
FUNLOCKFILE(fp);
|
||||
return (0);
|
||||
|
||||
/*
|
||||
* We get here if we cannot optimise the seek ... just
|
||||
* do it. Allow the seek function to change fp->_bf._base.
|
||||
*/
|
||||
dumb:
|
||||
if (__sflush(fp) ||
|
||||
(*seekfn)(fp->_cookie, (fpos_t)offset, whence) == POS_ERR) {
|
||||
FUNLOCKFILE(fp);
|
||||
return (-1);
|
||||
}
|
||||
/* success: clear EOF indicator and discard ungetc() data */
|
||||
if (HASUB(fp))
|
||||
FREEUB(fp);
|
||||
fp->_p = fp->_bf._base;
|
||||
fp->_r = 0;
|
||||
/* fp->_w = 0; */ /* unnecessary (I think...) */
|
||||
fp->_flags &= ~__SEOF;
|
||||
FUNLOCKFILE(fp);
|
||||
return (0);
|
||||
}
|
||||
|
|
@ -0,0 +1,102 @@
|
|||
/* $NetBSD: ftello.c,v 1.1 2000/07/08 13:46:35 kleink Exp $ */
|
||||
|
||||
/*-
|
||||
* Copyright (c) 1990, 1993
|
||||
* The Regents of the University of California. All rights reserved.
|
||||
*
|
||||
* This code is derived from software contributed to Berkeley by
|
||||
* Chris Torek.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. All advertising materials mentioning features or use of this software
|
||||
* must display the following acknowledgement:
|
||||
* This product includes software developed by the University of
|
||||
* California, Berkeley and its contributors.
|
||||
* 4. Neither the name of the University nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*/
|
||||
|
||||
#include <sys/cdefs.h>
|
||||
#if defined(LIBC_SCCS) && !defined(lint)
|
||||
__RCSID("$NetBSD: ftello.c,v 1.1 2000/07/08 13:46:35 kleink Exp $");
|
||||
#endif /* LIBC_SCCS and not lint */
|
||||
|
||||
#include "namespace.h"
|
||||
#include <assert.h>
|
||||
#include <errno.h>
|
||||
#include <stdio.h>
|
||||
#include "local.h"
|
||||
#include "reentrant.h"
|
||||
|
||||
/*
|
||||
* ftell: return current offset.
|
||||
*/
|
||||
off_t
|
||||
ftello(fp)
|
||||
FILE *fp;
|
||||
{
|
||||
fpos_t pos;
|
||||
|
||||
|
||||
FLOCKFILE(fp);
|
||||
|
||||
if (fp->_seek == NULL) {
|
||||
FUNLOCKFILE(fp);
|
||||
errno = ESPIPE; /* historic practice */
|
||||
return ((off_t)-1);
|
||||
}
|
||||
|
||||
/*
|
||||
* Find offset of underlying I/O object, then
|
||||
* adjust for buffered bytes.
|
||||
*/
|
||||
__sflush(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);
|
||||
if (pos == (fpos_t)-1) {
|
||||
FUNLOCKFILE(fp);
|
||||
return (pos);
|
||||
}
|
||||
}
|
||||
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);
|
||||
return (pos);
|
||||
}
|
||||
Loading…
Reference in New Issue