141946Sbostic /*- 241946Sbostic * Copyright (c) 1990 The Regents of the University of California. 334828Sbostic * All rights reserved. 434828Sbostic * 541946Sbostic * %sccs.include.redist.c% 630423Smckusick */ 730423Smckusick 830423Smckusick #if defined(LIBC_SCCS) && !defined(lint) 9*56416Sbostic static char sccsid[] = "@(#)ffs.c 5.5 (Berkeley) 10/04/92"; 1034828Sbostic #endif /* LIBC_SCCS and not lint */ 1130423Smckusick 1242181Sbostic #include <string.h> 1342181Sbostic 1430423Smckusick /* 1530423Smckusick * ffs -- vax ffs instruction 1630423Smckusick */ 17*56416Sbostic int 1830423Smckusick ffs(mask) 1941946Sbostic register int mask; 2030423Smckusick { 2141946Sbostic register int bit; 2230423Smckusick 2330423Smckusick if (mask == 0) 2430423Smckusick return(0); 2541946Sbostic for (bit = 1; !(mask & 1); bit++) 2630423Smckusick mask >>= 1; 2741946Sbostic return(bit); 2830423Smckusick } 29