1 // SPDX-License-Identifier: BSD-3-Clause 2 /* 3 * Copyright (c) 1994-2009 Red Hat, Inc. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * 2. Redistributions in binary form must reproduce the above copyright notice, 13 * this list of conditions and the following disclaimer in the documentation 14 * and/or other materials provided with the distribution. 15 * 16 * 3. Neither the name of the copyright holder nor the names of its 17 * contributors may be used to endorse or promote products derived from this 18 * software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 FUNCTION 35 <<abs>>---integer absolute value (magnitude) 36 37 INDEX 38 abs 39 40 ANSI_SYNOPSIS 41 #include <stdlib.h> 42 int abs(int <[i]>); 43 44 TRAD_SYNOPSIS 45 #include <stdlib.h> 46 int abs(<[i]>) 47 int <[i]>; 48 49 DESCRIPTION 50 <<abs>> returns 51 @tex 52 $|x|$, 53 @end tex 54 the absolute value of <[i]> (also called the magnitude 55 of <[i]>). That is, if <[i]> is negative, the result is the opposite 56 of <[i]>, but if <[i]> is nonnegative the result is <[i]>. 57 58 The similar function <<labs>> uses and returns <<long>> rather than <<int>> values. 59 60 RETURNS 61 The result is a nonnegative integer. 62 63 PORTABILITY 64 <<abs>> is ANSI. 65 66 No supporting OS subroutines are required. 67 */ 68 69 #include "_ansi.h" 70 #include <stdlib.h> 71 72 int 73 _DEFUN (abs, (i), int i) 74 { 75 return (i < 0) ? -i : i; 76 } 77