1  /*
       2   * Format clock_t-typed values.
       3   * Copyright (c) 2018-2022 The strace developers.
       4   * All rights reserved.
       5   *
       6   * SPDX-License-Identifier: GPL-2.0-or-later
       7   */
       8  
       9  #include "tests.h"
      10  #include <inttypes.h>
      11  #include <math.h>
      12  #include <stdint.h>
      13  #include <stdio.h>
      14  #include <unistd.h>
      15  
      16  const char *
      17  clock_t_str(uint64_t val, char *str, size_t str_size)
      18  {
      19  	static long clk_tck;
      20  	static int precision;
      21  
      22  	if (!clk_tck) {
      23  		clk_tck = sysconf(_SC_CLK_TCK);
      24  		precision = clk_tck > 1 ? MIN((int) ceil(log10(clk_tck - 1)), 9)
      25  					: 0;
      26  	}
      27  
      28  	if ((clk_tck > 0) && val) {
      29  		snprintf(str, str_size, "%" PRIu64 " /* %" PRIu64 ".%0*u s */",
      30  			 val, val / clk_tck, precision,
      31  			 (unsigned) round(((double) (val % clk_tck) / clk_tck)
      32  					  * pow(10, precision)));
      33  	} else {
      34  		snprintf(str, str_size, "%" PRIu64, val);
      35  	}
      36  
      37  	return str;
      38  }