1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #if defined(LIBC_SCCS) && !defined(lint) 9 static char sccsid[] = "@(#)ffs.c 5.5 (Berkeley) 10/04/92"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 #include <string.h> 13 14 /* 15 * ffs -- vax ffs instruction 16 */ 17 int 18 ffs(mask) 19 register int mask; 20 { 21 register int bit; 22 23 if (mask == 0) 24 return(0); 25 for (bit = 1; !(mask & 1); bit++) 26 mask >>= 1; 27 return(bit); 28 } 29