newlib/libc/stdlib/labs.c

   1 /*
   2 FUNCTION
   3 <<labs>>---long integer absolute value
   4
   5 INDEX
   6         labs
   7
   8 SYNOPSIS
   9         #include <stdlib.h>
  10         long labs(long <[i]>);
  11
  12 DESCRIPTION
  13 <<labs>> returns
  14 @tex
  15 $|x|$,
  16 @end tex
  17 the absolute value of <[i]> (also called the magnitude
  18 of <[i]>).  That is, if <[i]> is negative, the result is the opposite
  19 of <[i]>, but if <[i]> is nonnegative the result is <[i]>.
  20
  21 The similar function <<abs>> uses and returns <<int>> rather than
  22 <<long>> values.
  23
  24 RETURNS
  25 The result is a nonnegative long integer.
  26
  27 PORTABILITY
  28 <<labs>> is ANSI.
  29
  30 No supporting OS subroutine calls are required.
  31 */
  32
  33 #include <stdlib.h>
  34
  35 long
  36 labs (long x)
  37 {
  38   if (x < 0)
  39     {
  40       x = -x;
  41     }
  42   return x;
  43 }