llabs.c

Newlib 嵌入式 C库 标准实现代码

/*
FUNCTION
<<llabs>>---compute the absolute value of an long long integer.

INDEX
        llabs

ANSI_SYNOPSIS
        #include <stdlib.h>
        long long llabs(long long j);

TRAD_SYNOPSIS
        #include <stdlib.h>
        long long llabs(<[j]>)
        long long <[j]>;

DESCRIPTION
The <<llabs>> function computes the absolute value of the long long integer 
argument <[j]> (also called the magnitude of <[j]>).

The similar function <<labs>> uses and returns <<long>> rather than
<<long long>> values.

RETURNS
A nonnegative long long integer.

PORTABILITY
<<llabs>> is ISO 9899 (C99) compatable.

No supporting OS subroutines are required.
*/

/*-
 * Copyright (c) 2001 Mike Barcroft <[e-mail]>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <stdlib.h>

long long
_DEFUN(llabs, (j),
       long long j)
{
	return (j < 0 ? -j : j);
}