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fmtscale.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2010 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>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * Glenn Fowler
 * AT&T Research
 *
 * return number n scaled to metric multiples of k { 1000 1024 }
 * return string length is at most 5 chars + terminating nul
 */

#include <ast.h>
#include <lclib.h>

char*
fmtscale(register Sfulong_t n, int k)
{
      register Sfulong_t      m;
      int               r;
      int               z;
      const char*       u;
      char              suf[3];
      char*             s;
      char*             buf;
      Lc_numeric_t*           p = (Lc_numeric_t*)LCINFO(AST_LC_NUMERIC)->data;

      static const char scale[] = "bkMGTPE";

      u = scale;
      if (n < 1000)
            r = 0;
      else
      {
            m = 0;
            while (n >= k && *(u + 1))
            {
                  m = n;
                  n /= k;
                  u++;
            }
            if ((r = (10 * (m % k) + (k / 2)) / k) > 9)
            {
                  r = 0;
                  n++;
            }
            if (k == 1024 && n >= 1000)
            {
                  n = 1;
                  r = 0;
                  u++;
            }
      }
      buf = fmtbuf(z = 8);
      s = suf;
      if (u > scale)
      {
            if (k == 1024)
            {
                  *s++ = *u == 'k' ? 'K' : *u;
                  *s++ = 'i';
            }
            else
                  *s++ = *u;
      }
      *s = 0;
      if (n > 0 && n < 10)
            sfsprintf(buf, z, "%I*u%c%d%s", sizeof(n), n, p->decimal >= 0 ? p->decimal : '.', r, suf);
      else
      {
            if (r >= 5)
                  n++;
            sfsprintf(buf, z, "%I*u%s", sizeof(n), n, suf);
      }
      return buf;
}

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