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 } 24