mirror of
git://git.code.sf.net/p/cdesktopenv/code
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59 lines
2.1 KiB
C
59 lines
2.1 KiB
C
/***********************************************************************
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* *
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* This software is part of the ast package *
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* Copyright (c) 1985-2011 AT&T Intellectual Property *
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* and is licensed under the *
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* Eclipse Public License, Version 1.0 *
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* by AT&T Intellectual Property *
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* *
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* A copy of the License is available at *
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* http://www.eclipse.org/org/documents/epl-v10.html *
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* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
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* *
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* Information and Software Systems Research *
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* AT&T Research *
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* Florham Park NJ *
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* *
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* Glenn Fowler <gsf@research.att.com> *
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* David Korn <dgk@research.att.com> *
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* Phong Vo <kpv@research.att.com> *
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* *
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***********************************************************************/
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#include "sfhdr.h"
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/* Return the length of a double value if coded in a portable format
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**
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** Written by Kiem-Phong Vo
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*/
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#if __STD_C
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int _sfdlen(Sfdouble_t v)
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#else
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int _sfdlen(v)
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Sfdouble_t v;
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#endif
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{
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#define N_ARRAY (16*sizeof(Sfdouble_t))
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reg int n, w;
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Sfdouble_t x;
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int exp;
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if(v < 0)
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v = -v;
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/* make the magnitude of v < 1 */
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if(v != 0.)
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v = frexpl(v,&exp);
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else exp = 0;
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for(w = 1; w <= N_ARRAY; ++w)
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{ /* get 2^SF_PRECIS precision at a time */
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n = (int)(x = ldexpl(v,SF_PRECIS));
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v = x-n;
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if(v <= 0.)
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break;
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}
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return 1 + sfulen(exp) + w;
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}
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