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Annotation of 42BSD/usr.lib/lib2648/emptyrow.c, revision 1.1

1.1     ! root        1: /*     emptyrow.c      4.1     83/03/09        */
        !             2: /*
        !             3:  * emptyrow: returns true if row r of m is all zeros.
        !             4:  *
        !             5:  * Note that we assume the garbage at the end of the
        !             6:  * row is all zeros.
        !             7:  */
        !             8: 
        !             9: #include "bit.h"
        !            10: 
        !            11: emptyrow(m, rows, cols, r)
        !            12: bitmat m;
        !            13: int rows, cols, r;
        !            14: {
        !            15:        char *top, *bot;
        !            16: 
        !            17:        bot = &m[r*((cols+7)>>3)];
        !            18:        top = bot + ((cols-1) >> 3);
        !            19:        while (bot <= top)
        !            20:                if (*bot++)
        !            21:                        return(0);
        !            22:        return (1);
        !            23: }

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