usr/src/lib/libast/common/string/fmtclock.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #pragma prototyped
  23 /*
  24  * return pointer to formatted clock() tics t
  25  * return value length is at most 6
  26  */
  27
  28 #include <ast.h>
  29 #include <tm.h>
  30
  31 char*
  32 fmtclock(register Sfulong_t t)
  33 {
  34         register int            u;
  35         char*                   buf;
  36         int                     z;
  37
  38         static unsigned int     clk_tck;
  39
  40         if (!clk_tck)
  41         {
  42 #ifdef CLOCKS_PER_SEC
  43                 clk_tck = CLOCKS_PER_SEC;
  44 #else
  45                 if (!(clk_tck = (unsigned int)strtoul(astconf("CLK_TCK", NiL, NiL), NiL, 10)))
  46                         clk_tck = 60;
  47 #endif
  48         }
  49         if (t == 0)
  50                 return "0";
  51         if (t == ((Sfulong_t)~0))
  52                 return "%";
  53         t = (t * 1000000) / clk_tck;
  54         if (t < 1000)
  55                 u = 'u';
  56         else if ((t /= 1000) < 1000)
  57                 u = 'm';
  58         else
  59                 return fmtelapsed(t / 10, 100);
  60         buf = fmtbuf(z = 7);
  61         sfsprintf(buf, z, "%I*u%cs", sizeof(t), t, u);
  62         return buf;
  63 }