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 a portably coded double value
25 **
26 ** Written by Kiem-Phong Vo
27 */
28
29 #if __STD_C
sfgetd(Sfio_t * f)30 Sfdouble_t sfgetd(Sfio_t* f)
31 #else
32 Sfdouble_t sfgetd(f)
33 Sfio_t* f;
34 #endif
35 {
36 reg uchar *s, *ends, c;
37 reg int p, sign, exp;
38 Sfdouble_t v;
39 SFMTXDECL(f); /* declare a local stream variable for multithreading */
40
41 SFMTXENTER(f,-1.);
42
43 if((sign = sfgetc(f)) < 0 || (exp = (int)sfgetu(f)) < 0)
44 SFMTXRETURN(f, -1.);
45
46 if(f->mode != SF_READ && _sfmode(f,SF_READ,0) < 0)
47 SFMTXRETURN(f, -1.);
48
49 SFLOCK(f,0);
50
51 v = 0.;
52 for(;;)
53 { /* fast read for data */
54 if(SFRPEEK(f,s,p) <= 0)
55 { f->flags |= SF_ERROR;
56 v = -1.;
57 goto done;
58 }
59
60 for(ends = s+p; s < ends; )
61 { c = *s++;
62 v += SFUVALUE(c);
63 v = ldexpl(v,-SF_PRECIS);
64 if(!(c&SF_MORE))
65 { f->next = s;
66 goto done;
67 }
68 }
69 f->next = s;
70 }
71
72 done:
73 v = ldexpl(v,(sign&02) ? -exp : exp);
74 if(sign&01)
75 v = -v;
76
77 SFOPEN(f,0);
78 SFMTXRETURN(f, v);
79 }
80