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Annotation of 43BSDReno/old/lib2648/emptyrow.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1980 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  */
                      6: 
                      7: #ifndef lint
                      8: static char sccsid[] = "@(#)emptyrow.c 5.1 (Berkeley) 4/30/85";
                      9: #endif not lint
                     10: 
                     11: /*
                     12:  * emptyrow: returns true if row r of m is all zeros.
                     13:  *
                     14:  * Note that we assume the garbage at the end of the
                     15:  * row is all zeros.
                     16:  */
                     17: 
                     18: #include "bit.h"
                     19: 
                     20: emptyrow(m, rows, cols, r)
                     21: bitmat m;
                     22: int rows, cols, r;
                     23: {
                     24:        char *top, *bot;
                     25: 
                     26:        bot = &m[r*((cols+7)>>3)];
                     27:        top = bot + ((cols-1) >> 3);
                     28:        while (bot <= top)
                     29:                if (*bot++)
                     30:                        return(0);
                     31:        return (1);
                     32: }

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