Added functions fseeko() and ftello() (from susv2).

Fixed fgetpos() and fsetpos() for offsets > 2GB.

PR:		8637
Submitted by:	 Dan Nelson <dnelson@emsphone.com> (adjusted by me a little)

6 files changed, 83 insertions, 15 deletions

diff --git a/lib/libc/stdio/Makefile.inc b/lib/libc/stdio/Makefile.inc
index fc9b803..09a6030 100644
--- a/lib/libc/stdio/Makefile.inc
+++ b/lib/libc/stdio/Makefile.inc
@@ -1,5 +1,5 @@
 #	@(#)Makefile.inc	8.3 (Berkeley) 4/17/94
-#	$Id: Makefile.inc,v 1.14 1998/04/11 07:40:41 jb Exp $
+#	$Id: Makefile.inc,v 1.15 1998/05/08 05:17:11 jb Exp $
 
 # stdio sources
 .PATH: ${.CURDIR}/../libc/stdio
@@ -28,6 +28,7 @@ MLINKS+=fopen.3 fdopen.3 fopen.3 freopen.3
 MLINKS+=fputs.3 puts.3
 MLINKS+=fread.3 fwrite.3
 MLINKS+=fseek.3 fgetpos.3 fseek.3 fsetpos.3 fseek.3 ftell.3 fseek.3 rewind.3
+MLINKS+=fseek.3 fseeko.3 fseek.3 ftello.3
 MLINKS+=funopen.3 fropen.3 funopen.3 fwopen.3
 MLINKS+=getc.3 fgetc.3 getc.3 getchar.3 getc.3 getw.3
 MLINKS+=mktemp.3 mkdtemp.3 mktemp.3 mkstemp.3
diff --git a/lib/libc/stdio/fgetpos.c b/lib/libc/stdio/fgetpos.c
index 7cac82e..eed7b13 100644
--- a/lib/libc/stdio/fgetpos.c
+++ b/lib/libc/stdio/fgetpos.c
@@ -39,7 +39,7 @@
 static char sccsid[] = "@(#)fgetpos.c	8.1 (Berkeley) 6/4/93";
 #endif
 static const char rcsid[] =
-		"$Id: fgetpos.c,v 1.5 1997/02/22 15:01:53 peter Exp $";
+		"$Id: fgetpos.c,v 1.6 1998/04/11 07:40:42 jb Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <stdio.h>
@@ -52,7 +52,7 @@ fgetpos(fp, pos)
 {
 	int retval;
 	FLOCKFILE(fp);
-	retval = (*pos = ftell(fp)) == (fpos_t)-1;
+	retval = (*pos = ftello(fp)) == (fpos_t)-1;
 	FUNLOCKFILE(fp);
 	return(retval);
 }
diff --git a/lib/libc/stdio/fseek.3 b/lib/libc/stdio/fseek.3
index 5dd79e9..064130a 100644
--- a/lib/libc/stdio/fseek.3
+++ b/lib/libc/stdio/fseek.3
@@ -41,8 +41,10 @@
 .Sh NAME
 .Nm fgetpos ,
 .Nm fseek ,
+.Nm fseeko ,
 .Nm fsetpos ,
 .Nm ftell ,
+.Nm ftello ,
 .Nm rewind
 .Nd reposition a stream
 .Sh SYNOPSIS
@@ -57,6 +59,10 @@
 .Fn fgetpos "FILE *stream" "fpos_t *pos"
 .Ft int
 .Fn fsetpos "FILE *stream" "const fpos_t *pos"
+.Ft int
+.Fn fseeko "FILE *stream" "off_t offset" "int whence"
+.Ft off_t
+.Fn ftello "FILE *stream"
 .Sh DESCRIPTION
 The
 .Fn fseek
@@ -106,6 +112,22 @@ except that the error indicator for the stream is also cleared
 .Xr clearerr 3 ) .
 .Pp
 The
+.Fn fseeko
+function is identical to
+.Fn fseek ,
+but take an
+.Fa off_t
+argument
+instead of a
+.Fa long .
+Likewise, the
+.Fn ftello
+function is identical to
+.Fn ftell ,
+but returns
+.Fa off_t .
+.Pp
+The
 .Fn fgetpos
 and
 .Fn fsetpos
@@ -115,8 +137,8 @@ are alternate interfaces equivalent to
 and
 .Fn fseek
 (with whence set to
-.Dv SEEK_SET
-), setting and storing the current value of
+.Dv SEEK_SET ) ,
+setting and storing the current value of
 the file offset into or from the object referenced by 
 .Fa pos .
 On some
@@ -133,10 +155,14 @@ returns no value.
 Upon successful completion,
 .Fn fgetpos ,
 .Fn fseek ,
+.Fn fseeko ,
+and
 .Fn fsetpos
 return 0,
 and
 .Fn ftell
+and
+.Fn ftello
 returns the current offset.
 Otherwise, \-1 is returned and the global variable errno is set to
 indicate the error.
@@ -157,14 +183,21 @@ was not
 .Dv SEEK_END ,
 or
 .Dv SEEK_CUR .
+.It Bq Er EOVERFLOW
+For 
+.Fn ftell ,
+the resulting file offset would be a value which
+cannot be represented correctly in an object of type long.
 .El
 .Pp
-The function
+The functions
 .Fn fgetpos ,
 .Fn fseek ,
+.Fn fseeko ,
 .Fn fsetpos ,
-and 
-.Fn ftell
+.Fn ftell ,
+and
+.Fn ftello
 may also fail and set
 .Va errno
 for any of the errors specified for the routines
@@ -186,3 +219,10 @@ and
 functions
 conform to
 .St -ansiC .
+.Pp
+The
+.Fn fseeko 
+and
+.Fn ftello
+functions conform to
+.St -susv2 .
diff --git a/lib/libc/stdio/fseek.c b/lib/libc/stdio/fseek.c
index 808d3ae..7d7254a 100644
--- a/lib/libc/stdio/fseek.c
+++ b/lib/libc/stdio/fseek.c
@@ -39,7 +39,7 @@
 static char sccsid[] = "@(#)fseek.c	8.3 (Berkeley) 1/2/94";
 #endif
 static const char rcsid[] =
-		"$Id: fseek.c,v 1.6 1997/02/22 15:02:05 peter Exp $";
+		"$Id: fseek.c,v 1.7 1998/04/11 07:40:44 jb Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <sys/types.h>
@@ -53,14 +53,23 @@ static const char rcsid[] =
 
 #define	POS_ERR	(-(fpos_t)1)
 
+int
+fseek(fp, offset, whence)
+	register FILE *fp;
+	long offset;
+	int whence;
+{
+	return (fseeko(fp, offset, whence));
+}
+
 /*
  * Seek the given file to the given offset.
  * `Whence' must be one of the three SEEK_* macros.
  */
 int
-fseek(fp, offset, whence)
+fseeko(fp, offset, whence)
 	register FILE *fp;
-	long offset;
+	off_t offset;
 	int whence;
 {
 	register fpos_t (*seekfn) __P((void *, fpos_t, int));
diff --git a/lib/libc/stdio/fsetpos.c b/lib/libc/stdio/fsetpos.c
index d521a20..72a4bf2 100644
--- a/lib/libc/stdio/fsetpos.c
+++ b/lib/libc/stdio/fsetpos.c
@@ -39,9 +39,10 @@
 static char sccsid[] = "@(#)fsetpos.c	8.1 (Berkeley) 6/4/93";
 #endif
 static const char rcsid[] =
-		"$Id$";
+		"$Id: fsetpos.c,v 1.5 1997/02/22 15:02:06 peter Exp $";
 #endif /* LIBC_SCCS and not lint */
 
+#include <sys/types.h>
 #include <stdio.h>
 
 /*
@@ -52,5 +53,5 @@ fsetpos(iop, pos)
 	FILE *iop;
 	const fpos_t *pos;
 {
-	return (fseek(iop, (long)*pos, SEEK_SET));
+	return (fseeko(iop, (off_t)*pos, SEEK_SET));
 }
diff --git a/lib/libc/stdio/ftell.c b/lib/libc/stdio/ftell.c
index 34da271..552ed21 100644
--- a/lib/libc/stdio/ftell.c
+++ b/lib/libc/stdio/ftell.c
@@ -39,21 +39,38 @@
 static char sccsid[] = "@(#)ftell.c	8.2 (Berkeley) 5/4/95";
 #endif
 static const char rcsid[] =
-		"$Id: ftell.c,v 1.8 1997/03/11 11:40:40 peter Exp $";
+		"$Id: ftell.c,v 1.9 1998/04/11 07:40:44 jb Exp $";
 #endif /* LIBC_SCCS and not lint */
 
+#include <sys/types.h>
 #include <stdio.h>
 #include <errno.h>
 #include "local.h"
 #include "libc_private.h"
 
 /*
- * ftell: return current offset.
+ * standard ftell function.
  */
 long
 ftell(fp)
 	register FILE *fp;
 {
+	register off_t rv;
+	rv = ftello(fp);
+	if ((long)rv != rv) {
+		errno = EOVERFLOW;
+		return (-1);
+	}
+	return (rv);
+}
+
+/*
+ * ftello: return current offset.
+ */
+off_t
+ftello(fp)
+	register FILE *fp;
+{
 	register fpos_t pos;
 
 	if (fp->_seek == NULL) {