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 a long value coded in a portable format.
25**
26**	Written by Kiem-Phong Vo
27*/
28
29#if __STD_C
30Sflong_t sfgetl(Sfio_t* f)
31#else
32Sflong_t sfgetl(f)
33Sfio_t*	f;
34#endif
35{
36	Sflong_t	v;
37	uchar		*s, *ends, c;
38	int		p;
39	SFMTXDECL(f);
40
41	SFMTXENTER(f,(Sflong_t)(-1));
42
43	if(f->mode != SF_READ && _sfmode(f,SF_READ,0) < 0)
44		SFMTXRETURN(f, (Sflong_t)(-1));
45	SFLOCK(f,0);
46
47	for(v = 0;;)
48	{	if(SFRPEEK(f,s,p) <= 0)
49		{	f->flags |= SF_ERROR;
50			v = (Sflong_t)(-1);
51			goto done;
52		}
53		for(ends = s+p; s < ends;)
54		{	c = *s++;
55			if(c&SF_MORE)
56				v = ((Sfulong_t)v << SF_UBITS) | SFUVALUE(c);
57			else
58			{	/* special translation for this byte */
59				v = ((Sfulong_t)v << SF_SBITS) | SFSVALUE(c);
60				f->next = s;
61				v = (c&SF_SIGN) ? -v-1 : v;
62				goto done;
63			}
64		}
65		f->next = s;
66	}
67done :
68	SFOPEN(f,0);
69	SFMTXRETURN(f, v);
70}
71