/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2011 AT&T Intellectual Property *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#include "sfhdr.h"
/* Read a portably coded double value
**
** Written by Kiem-Phong Vo
*/
#if __STD_C
Sfdouble_t sfgetd(Sfio_t* f)
#else
Sfdouble_t sfgetd(f)
Sfio_t* f;
#endif
{
reg uchar *s, *ends, c;
reg int p, sign, exp;
Sfdouble_t v;
SFMTXDECL(f); /* declare a local stream variable for multithreading */
SFMTXENTER(f,-1.);
if((sign = sfgetc(f)) < 0 || (exp = (int)sfgetu(f)) < 0)
SFMTXRETURN(f, -1.);
if(f->mode != SF_READ && _sfmode(f,SF_READ,0) < 0)
SFMTXRETURN(f, -1.);
SFLOCK(f,0);
v = 0.;
for(;;)
{ /* fast read for data */
if(SFRPEEK(f,s,p) <= 0)
{ f->flags |= SF_ERROR;
v = -1.;
goto done;
}
for(ends = s+p; s < ends; )
{ c = *s++;
v += SFUVALUE(c);
v = ldexpl(v,-SF_PRECIS);
if(!(c&SF_MORE))
{ f->next = s;
goto done;
}
}
f->next = s;
}
done:
v = ldexpl(v,(sign&02) ? -exp : exp);
if(sign&01)
v = -v;
SFOPEN(f,0);
SFMTXRETURN(f, v);
}