newlib/libc/time/difftime.c

   1 /*
   2  * difftime.c
   3  * Original Author:     G. Haley
   4  */
   5
   6 /*
   7 FUNCTION
   8 <<difftime>>---subtract two times
   9
  10 INDEX
  11         difftime
  12
  13 SYNOPSIS
  14         #include <time.h>
  15         double difftime(time_t <[tim1]>, time_t <[tim2]>);
  16
  17 DESCRIPTION
  18 Subtracts the two times in the arguments: `<<<[tim1]> - <[tim2]>>>'.
  19
  20 RETURNS
  21 The difference (in seconds) between <[tim2]> and <[tim1]>, as a <<double>>.
  22
  23 PORTABILITY
  24 ANSI C requires <<difftime>>, and defines its result to be in seconds
  25 in all implementations.
  26
  27 <<difftime>> requires no supporting OS subroutines.
  28 */
  29
  30 #include <time.h>
  31
  32 double
  33 difftime (time_t tim1,
  34         time_t tim2)
  35 {
  36   return (double)(tim1 - tim2);
  37 }