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 * Eclipse Public License, Version 1.0 *
7 * by AT&T Intellectual Property *
8 * *
9 * A copy of the License is available at *
10 * http://www.eclipse.org/org/documents/epl-v10.html *
11 * (with md5 checksum b35adb5213ca9657e911e9befb180842) *
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
sfgetu(Sfio_t * f)30 Sfulong_t sfgetu(Sfio_t* f)
31 #else
32 Sfulong_t sfgetu(f)
33 Sfio_t* f;
34 #endif
35 {
36 Sfulong_t v;
37 uchar *s, *ends, c;
38 int p;
39 SFMTXDECL(f); /* declare a local stream variable for multithreading */
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 }
64 done:
65 SFOPEN(f,0);
66 SFMTXRETURN(f, v);
67 }
68