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sfgetm.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2007 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 an unsigned long value coded portably for a given range.
**
**    Written by Kiem-Phong Vo
*/

#if __STD_C
Sfulong_t sfgetm(reg Sfio_t* f, Sfulong_t m)
#else
Sfulong_t sfgetm(f, m)
reg Sfio_t* f;
Sfulong_t   m;
#endif
{
      Sfulong_t   v;
      reg uchar   *s, *ends, c;
      reg int           p;

      SFMTXSTART(f, (Sfulong_t)(-1));

      if(f->mode != SF_READ && _sfmode(f,SF_READ,0) < 0)
            SFMTXRETURN(f, (Sfulong_t)(-1));

      SFLOCK(f,0);

      for(v = 0;; )
      {     if(SFRPEEK(f,s,p) <= 0)
            {     f->flags |= SF_ERROR;
                  v = (Sfulong_t)(-1);
                  goto done;
            }
            for(ends = s+p; s < ends;)
            {     c = *s++;
                  v = (v << SF_BBITS) | SFBVALUE(c);
                  if((m >>= SF_BBITS) <= 0)
                  {     f->next = s;
                        goto done;
                  }
            }
            f->next = s;
      }
done:
      SFOPEN(f,0);
      SFMTXRETURN(f, v);
}

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