用于嵌入式Linux系统的标准C的库函数

				/*				FUNCTION				---long integer absolute value								INDEX					labs								ANSI_SYNOPSIS					#include 					long labs(long );								TRAD_SYNOPSIS					#include 					long labs()					long ;								DESCRIPTION				 returns				@tex				$|x|$,				@end tex				the absolute value of  (also called the magnitude				of ).  That is, if  is negative, the result is the opposite				of , but if  is nonnegative the result is .								The similar function  uses and returns  rather than				 values.								RETURNS				The result is a nonnegative long integer.								PORTABILITY				 is ANSI.								No supporting OS subroutine calls are required.				*/								#include 								long				_DEFUN (labs, (x),					long x)				{				  if (x < 0)				    {				      x = -x;				    }				  return x;				}