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ffsl.c revision 1.2.4.2 
      1  1.2.4.2  perseant /*	$NetBSD: ffsl.c,v 1.2.4.2 2025/08/02 05:18:34 perseant Exp $	*/
      2  1.2.4.2  perseant 
      3  1.2.4.2  perseant /*-
      4  1.2.4.2  perseant  * Copyright (c) 2024 The NetBSD Foundation, Inc.
      5  1.2.4.2  perseant  * All rights reserved.
      6  1.2.4.2  perseant  *
      7  1.2.4.2  perseant  * Redistribution and use in source and binary forms, with or without
      8  1.2.4.2  perseant  * modification, are permitted provided that the following conditions
      9  1.2.4.2  perseant  * are met:
     10  1.2.4.2  perseant  * 1. Redistributions of source code must retain the above copyright
     11  1.2.4.2  perseant  *    notice, this list of conditions and the following disclaimer.
     12  1.2.4.2  perseant  * 2. Redistributions in binary form must reproduce the above copyright
     13  1.2.4.2  perseant  *    notice, this list of conditions and the following disclaimer in the
     14  1.2.4.2  perseant  *    documentation and/or other materials provided with the distribution.
     15  1.2.4.2  perseant  *
     16  1.2.4.2  perseant  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  1.2.4.2  perseant  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  1.2.4.2  perseant  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  1.2.4.2  perseant  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  1.2.4.2  perseant  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  1.2.4.2  perseant  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  1.2.4.2  perseant  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  1.2.4.2  perseant  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  1.2.4.2  perseant  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  1.2.4.2  perseant  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  1.2.4.2  perseant  * POSSIBILITY OF SUCH DAMAGE.
     27  1.2.4.2  perseant  */
     28  1.2.4.2  perseant 
     29  1.2.4.2  perseant #include <sys/cdefs.h>
     30  1.2.4.2  perseant __RCSID("$NetBSD: ffsl.c,v 1.2.4.2 2025/08/02 05:18:34 perseant Exp $");
     31  1.2.4.2  perseant 
     32  1.2.4.2  perseant #include <sys/bitops.h>
     33  1.2.4.2  perseant 
     34  1.2.4.2  perseant #include <limits.h>
     35  1.2.4.2  perseant #include <strings.h>
     36  1.2.4.2  perseant 
     37  1.2.4.2  perseant #undef	ffsl			/* paranoia */
     38  1.2.4.2  perseant 
     39  1.2.4.2  perseant int
     40  1.2.4.2  perseant ffsl(long x)
     41  1.2.4.2  perseant {
     42  1.2.4.2  perseant 
     43  1.2.4.2  perseant #ifdef _LP64
     44  1.2.4.2  perseant 	__CTASSERT(CHAR_BIT*sizeof(x) == 64);
     45  1.2.4.2  perseant 	return ffs64(x);
     46  1.2.4.2  perseant #else
     47  1.2.4.2  perseant 	__CTASSERT(CHAR_BIT*sizeof(x) == 32);
     48  1.2.4.2  perseant 	return ffs32((uint32_t)x);
     49  1.2.4.2  perseant #endif
     50  1.2.4.2  perseant }
     51