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Annotation of 42BSD/usr.lib/lib2648/emptyrow.c, revision 1.1.1.1

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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