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 portably for a given range.
25**
26**	Written by Kiem-Phong Vo
27*/
28
29#if __STD_C
30Sfulong_t sfgetm(Sfio_t* f, Sfulong_t m)
31#else
32Sfulong_t sfgetm(f, m)
33Sfio_t*		f;
34Sfulong_t	m;
35#endif
36{
37	Sfulong_t	v;
38	reg uchar	*s, *ends, c;
39	reg int		p;
40	SFMTXDECL(f);
41
42	SFMTXENTER(f, (Sfulong_t)(-1));
43
44	if(f->mode != SF_READ && _sfmode(f,SF_READ,0) < 0)
45		SFMTXRETURN(f, (Sfulong_t)(-1));
46
47	SFLOCK(f,0);
48
49	for(v = 0;; )
50	{	if(SFRPEEK(f,s,p) <= 0)
51		{	f->flags |= SF_ERROR;
52			v = (Sfulong_t)(-1);
53			goto done;
54		}
55		for(ends = s+p; s < ends;)
56		{	c = *s++;
57			v = (v << SF_BBITS) | SFBVALUE(c);
58			if((m >>= SF_BBITS) <= 0)
59			{	f->next = s;
60				goto done;
61			}
62		}
63		f->next = s;
64	}
65done:
66	SFOPEN(f,0);
67	SFMTXRETURN(f, v);
68}
69