/* FUNCTION <<ldiv>>---divide two long integers INDEX ldiv ANSI_SYNOPSIS #include <stdlib.h> ldiv_t ldiv(long <[n]>, long <[d]>); TRAD_SYNOPSIS #include <stdlib.h> ldiv_t ldiv(<[n]>, <[d]>) long <[n]>, <[d]>; DESCRIPTION Divide @tex $n/d$, @end tex @ifnottex <[n]>/<[d]>, @end ifnottex returning quotient and remainder as two long integers in a structure <<ldiv_t>>. RETURNS The result is represented with the structure . typedef struct . { . long quot; . long rem; . } ldiv_t; where the <<quot>> field represents the quotient, and <<rem>> the remainder. For nonzero <[d]>, if `<<<[r]> = ldiv(<[n]>,<[d]>);>>' then <[n]> equals `<<<[r]>.rem + <[d]>*<[r]>.quot>>'. To divide <<int>> rather than <<long>> values, use the similar function <<div>>. PORTABILITY <<ldiv>> is ANSI. No supporting OS subroutines are required. */ /* * Copyright (c) 1990 Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Chris Torek. * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 <_ansi.h> #include <stdlib.h> /* ldiv_t */ ldiv_t _DEFUN (ldiv, (num, denom), long num _AND long denom) { ldiv_t r; /* see div.c for comments */ r.quot = num / denom; r.rem = num % denom; if (num >= 0 && r.rem < 0) { ++r.quot; r.rem -= denom; } else if (num < 0 && r.rem > 0) { --r.quot; r.rem += denom; } return (r); }