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) 04/30/85"; 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 } 33