From: Erik van der Kouwe <erik@minix3.org>
Date: Mon, 16 Aug 2010 17:06:08 +0000 (+0000)
Subject: Add fseeko function
X-Git-Tag: v3.1.8~71
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/doc/zpipe.c?a=commitdiff_plain;h=a3e4dcafe03612b5d9920beb27fa4994c1666c82;p=minix.git

Add fseeko function
---

diff --git a/include/stdio.h b/include/stdio.h
index 30559d0d9..0e61090b2 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -117,6 +117,7 @@ _PROTOTYPE( size_t fwrite,
 	(const void *_ptr, size_t _size, size_t _nmemb, FILE *_stream)	);
 _PROTOTYPE( int fgetpos, (FILE *_stream, fpos_t *_pos)			);
 _PROTOTYPE( int fseek, (FILE *_stream, long _offset, int _whence)	);
+_PROTOTYPE( int fseeko, (FILE *_stream, off_t _offset, int _whence)	);
 _PROTOTYPE( int fsetpos, (FILE *_stream, fpos_t *_pos)			);
 _PROTOTYPE( long ftell, (FILE *_stream)					);
 _PROTOTYPE( void rewind, (FILE *_stream)				);
diff --git a/lib/libc/stdio/fseek.c b/lib/libc/stdio/fseek.c
index 4e0d70948..ef6d47259 100644
--- a/lib/libc/stdio/fseek.c
+++ b/lib/libc/stdio/fseek.c
@@ -3,6 +3,7 @@
  */
 /* $Header$ */
 
+#include	<assert.h>
 #include	<stdio.h>
 
 #if	(SEEK_CUR != 1) || (SEEK_END != 2) || (SEEK_SET != 0)
@@ -17,6 +18,13 @@ off_t _lseek(int fildes, off_t offset, int whence);
 
 int
 fseek(FILE *stream, long int offset, int whence)
+{
+	assert(sizeof(offset) == sizeof(off_t));
+	return fseeko(stream, (off_t) offset, whence);
+}
+
+int
+fseeko(FILE *stream, off_t offset, int whence)
 {
 	int adjust = 0;
 	long pos;
diff --git a/man/man3/fseek.3 b/man/man3/fseek.3
index fe863bdac..53d22561a 100644
--- a/man/man3/fseek.3
+++ b/man/man3/fseek.3
@@ -3,20 +3,23 @@
 .TH FSEEK 3  "February 24, 1986"
 .AT 3
 .SH NAME
-fseek, ftell, rewind \- reposition a stream
+fseek, fseeko, ftell, rewind \- reposition a stream
 .SH SYNOPSIS
 .nf
 .ft B
 #include <stdio.h>
 
 int fseek(FILE *\fIstream\fP, long \fIoffset\fP, int \fIptrname\fP)
+int fseeko(FILE *\fIstream\fP, off_t \fIoffset\fP, int \fIptrname\fP)
 long ftell(FILE *\fIstream\fP)
 void rewind(FILE *\fIstream\fP)
 .ft R
 .fi
 .SH DESCRIPTION
 .B Fseek
-sets the position of the next input or output
+and
+.B fseeko
+set the position of the next input or output
 operation on the
 .IR stream .
 The new position is at the signed distance
@@ -28,7 +31,9 @@ according as
 has the value 0, 1, or 2.
 .PP
 .B Fseek
-undoes any effects of
+and
+.B fseeko
+undo any effects of
 .BR  ungetc (3).
 .PP
 .B Ftell
@@ -40,7 +45,9 @@ on some other systems it is a magic cookie,
 and the only foolproof way to obtain an 
 .I offset
 for
-.BR fseek .
+.BR fseek 
+and
+.BR fseeko .
 .PP
 .BR Rewind "(\fIstream\fR)"
 is equivalent to
@@ -50,4 +57,6 @@ is equivalent to
 .BR fopen (3).
 .SH DIAGNOSTICS
 .B Fseek
-returns \-1 for improper seeks, otherwise zero.
+and
+.B fseeko
+return \-1 for improper seeks, otherwise zero.