/***********************************************************************

*                                                                      *

*               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"

/*	Read an unsigned long value coded in a portable format.

**

**	Written by Kiem-Phong Vo

*/

#if __STD_C

Sfulong_t sfgetu(Sfio_t* f)

#else

Sfulong_t sfgetu(f)

Sfio_t*	f;

#endif

{

	Sfulong_t	v;

	uchar		*s, *ends, c;

	int		p;

	SFMTXDECL(f); /* declare a local stream variable for multithreading */

	SFMTXENTER(f, (Sfulong_t)(-1));

	if(f->mode != SF_READ && _sfmode(f,SF_READ,0) < 0)

		SFMTXRETURN(f, (Sfulong_t)(-1));

	SFLOCK(f,0);

	for(v = 0;;)

	{	if(SFRPEEK(f,s,p) <= 0)

		{	f->flags |= SF_ERROR;

			v = (Sfulong_t)(-1);

			goto done;

		}

		for(ends = s+p; s < ends;)

		{	c = *s++;

			v = (v << SF_UBITS) | SFUVALUE(c);

			if(!(c&SF_MORE))

			{	f->next = s;

				goto done;

			}

		}

		f->next = s;

	}

done:

	SFOPEN(f,0);

	SFMTXRETURN(f, v);

}