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sfgetd.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2009 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              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);

      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);
}

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