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fmtelapsed.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1985-2006 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                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
/*
 * return pointer to formatted elapsed time for t 1/n secs
 * compatible with strelapsed()
 * return value length is at most 6
 */

#include <ast.h>

char*
fmtelapsed(register unsigned long t, register int n)
{
      register unsigned long  s;
      char*             buf;
      int               z;

      static int        amt[] = { 1, 60, 60, 24, 7, 4, 12, 20 };
      static char       chr[] = "smhdwMYS";

      if (t == 0L)
            return "0";
      if (t == ~0L)
            return "%";
      buf = fmtbuf(z = 7);
      s = t / n;
      if (s < 60)
            sfsprintf(buf, z, "%d.%02ds", s % 100, (t * 100 / n) % 100);
      else
      {
            for (n = 1; n < elementsof(amt) - 1; n++)
            {
                  if ((t = s / amt[n]) < amt[n + 1])
                        break;
                  s = t;
            }
            sfsprintf(buf, z, "%d%c%02d%c", (s / amt[n]) % 100, chr[n], s % amt[n], chr[n - 1]);
      }
      return buf;
}

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