1/***********************************************************************
2*                                                                      *
3*               This software is part of the ast package               *
4*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
5*                      and is licensed under the                       *
6*                  Common Public License, Version 1.0                  *
7*                    by AT&T Intellectual Property                     *
8*                                                                      *
9*                A copy of the License is available at                 *
10*            http://www.opensource.org/licenses/cpl1.0.txt             *
11*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
12*                                                                      *
13*              Information and Software Systems Research               *
14*                            AT&T Research                             *
15*                           Florham Park NJ                            *
16*                                                                      *
17*                 Glenn Fowler <gsf@research.att.com>                  *
18*                  David Korn <dgk@research.att.com>                   *
19*                   Phong Vo <kpv@research.att.com>                    *
20*                                                                      *
21***********************************************************************/
22#include	"sfhdr.h"
23
24/*	Read an unsigned long value coded in a portable format.
25**
26**	Written by Kiem-Phong Vo
27*/
28
29#if __STD_C
30Sfulong_t sfgetu(Sfio_t* f)
31#else
32Sfulong_t sfgetu(f)
33Sfio_t*	f;
34#endif
35{
36	Sfulong_t	v;
37	uchar		*s, *ends, c;
38	int		p;
39	SFMTXDECL(f);
40
41	SFMTXENTER(f, (Sfulong_t)(-1));
42
43	if(f->mode != SF_READ && _sfmode(f,SF_READ,0) < 0)
44		SFMTXRETURN(f, (Sfulong_t)(-1));
45
46	SFLOCK(f,0);
47
48	for(v = 0;;)
49	{	if(SFRPEEK(f,s,p) <= 0)
50		{	f->flags |= SF_ERROR;
51			v = (Sfulong_t)(-1);
52			goto done;
53		}
54		for(ends = s+p; s < ends;)
55		{	c = *s++;
56			v = (v << SF_UBITS) | SFUVALUE(c);
57			if(!(c&SF_MORE))
58			{	f->next = s;
59				goto done;
60			}
61		}
62		f->next = s;
63	}
64done:
65	SFOPEN(f,0);
66	SFMTXRETURN(f, v);
67}
68