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Annotation of 43BSDReno/lib/libc/stdlib/div.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1990 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * This code is derived from software contributed to Berkeley by
                      6:  * Chris Torek.
                      7:  *
                      8:  * Redistribution and use in source and binary forms are permitted
                      9:  * provided that: (1) source distributions retain this entire copyright
                     10:  * notice and comment, and (2) distributions including binaries display
                     11:  * the following acknowledgement:  ``This product includes software
                     12:  * developed by the University of California, Berkeley and its contributors''
                     13:  * in the documentation or other materials provided with the distribution
                     14:  * and in all advertising materials mentioning features or use of this
                     15:  * software. Neither the name of the University nor the names of its
                     16:  * contributors may be used to endorse or promote products derived
                     17:  * from this software without specific prior written permission.
                     18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     19:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     20:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     21:  */
                     22: 
                     23: #if defined(LIBC_SCCS) && !defined(lint)
                     24: static char sccsid[] = "@(#)div.c      5.1 (Berkeley) 5/16/90";
                     25: #endif /* LIBC_SCCS and not lint */
                     26: 
                     27: #include <stdlib.h>            /* div_t */
                     28: 
                     29: /*
                     30:  * I AM NOT SURE THIS IS COMPLETELY PORTABLE
                     31:  * (or that it is even right)
                     32:  */
                     33: div_t
                     34: div(num, denom)
                     35:        int num, denom;
                     36: {
                     37:        div_t r;
                     38: 
                     39:        /* avoid deep thought */
                     40:        if (num > 0 && denom < 0) {
                     41:                num = -num;
                     42:                denom = -denom;
                     43:        }
                     44:        r.quot = num / denom;
                     45:        r.rem = num % denom;
                     46:        if (num < 0 && denom > 0) {
                     47:                /*
                     48:                 * Machine division and remainer may work either way.  The
                     49:                 * ANSI standard says that |r.quot| < |n/d| (where n/d
                     50:                 * computed in infinite precision).  If the remainder is
                     51:                 * positive, we got the `wrong' answer, so fix it.
                     52:                 */
                     53:                if (r.rem > 0) {
                     54:                        r.quot++;
                     55:                        r.rem -= denom;
                     56:                }
                     57:        }
                     58:        return (r);
                     59: }

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