Imported Upstream version 93u+upstream

1 files changed, 59 insertions, 0 deletions

diff --git a/src/lib/libast/sfio/sftell.c b/src/lib/libast/sfio/sftell.c
new file mode 100644
index 0000000..49c183c
--- /dev/null
+++ b/src/lib/libast/sfio/sftell.c
@@ -0,0 +1,59 @@
+/***********************************************************************
+*                                                                      *
+*               This software is part of the ast package               *
+*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
+*                      and is licensed under the                       *
+*                 Eclipse Public License, Version 1.0                  *
+*                    by AT&T Intellectual Property                     *
+*                                                                      *
+*                A copy of the License is available at                 *
+*          http://www.eclipse.org/org/documents/epl-v10.html           *
+*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
+*                                                                      *
+*              Information and Software Systems Research               *
+*                            AT&T Research                             *
+*                           Florham Park NJ                            *
+*                                                                      *
+*                 Glenn Fowler <gsf@research.att.com>                  *
+*                  David Korn <dgk@research.att.com>                   *
+*                   Phong Vo <kpv@research.att.com>                    *
+*                                                                      *
+***********************************************************************/
+#include	"sfhdr.h"
+
+/*	Tell the current location in a given stream
+**
+**	Written by Kiem-Phong Vo.
+*/
+
+#if __STD_C
+Sfoff_t sftell(Sfio_t* f)
+#else
+Sfoff_t sftell(f)
+Sfio_t	*f;
+#endif
+{	
+	reg int	mode;
+	Sfoff_t	p;
+	SFMTXDECL(f);
+
+	SFMTXENTER(f, (Sfoff_t)(-1));
+
+	/* set the stream to the right mode */
+	if((mode = f->mode&SF_RDWR) != (int)f->mode && _sfmode(f,mode,0) < 0)
+		SFMTXRETURN(f, (Sfoff_t)(-1));
+
+	/* throw away ungetc data */
+	if(f->disc == _Sfudisc)
+		(void)sfclose((*_Sfstack)(f,NIL(Sfio_t*)));
+
+	if(f->flags&SF_STRING)
+		SFMTXRETURN(f, (Sfoff_t)(f->next-f->data));
+
+	/* let sfseek() handle the hard case */
+	if(f->extent >= 0 && (f->flags&(SF_SHARE|SF_APPENDWR)) )
+		p = sfseek(f,(Sfoff_t)0,SEEK_CUR);
+	else	p = f->here + ((f->mode&SF_WRITE) ? f->next-f->data : f->next-f->endb);
+
+	SFMTXRETURN(f,p);
+}