xref: /titanic_50/usr/src/lib/libast/common/string/fmtclock.c (revision 5c51f1241dbbdf2656d0e10011981411ed0c9673)
1 /***********************************************************************
2 *                                                                      *
3 *               This software is part of the ast package               *
4 *          Copyright (c) 1985-2008 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 }
64