1 /***********************************************************************
2 * *
3 * This software is part of the ast package *
4 * Copyright (c) 1985-2010 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
sfgetm(Sfio_t * f,Sfulong_t m)30 Sfulong_t sfgetm(Sfio_t* f, Sfulong_t m)
31 #else
32 Sfulong_t sfgetm(f, m)
33 Sfio_t* f;
34 Sfulong_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 }
65 done:
66 SFOPEN(f,0);
67 SFMTXRETURN(f, v);
68 }
69