author | Jon Tibble <meths@btinternet.com> |
Thu, 09 Dec 2010 22:32:39 +0100 | |
changeset 13255 | 4afa820d78b9 |
parent 13105 | 48f2dbca79a2 |
permissions | -rw-r--r-- |
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/* |
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* CDDL HEADER START |
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* |
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* The contents of this file are subject to the terms of the |
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* Common Development and Distribution License (the "License"). |
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* You may not use this file except in compliance with the License. |
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* |
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE |
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* or http://www.opensolaris.org/os/licensing. |
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* See the License for the specific language governing permissions |
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* and limitations under the License. |
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* |
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* When distributing Covered Code, include this CDDL HEADER in each |
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE. |
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* If applicable, add the following below this CDDL HEADER, with the |
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* fields enclosed by brackets "[]" replaced with your own identifying |
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* information: Portions Copyright [yyyy] [name of copyright owner] |
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* |
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* CDDL HEADER END |
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*/ |
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|
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/* |
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* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. |
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*/ |
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|
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#include "lint.h" |
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#include <string.h> |
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#include <strings.h> |
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#include <sys/types.h> |
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|
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static int |
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ffs_impl(uint64_t bits) |
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{ |
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int i = 1; |
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uint32_t bits32; |
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|
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if (bits == 0) |
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return (0); |
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|
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if ((bits32 = (uint32_t)bits) == 0) { |
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bits32 = (uint32_t)(bits >> 32); |
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i += 32; |
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} |
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|
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if ((bits32 & 0xffff) == 0) { |
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bits32 >>= 16; |
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i += 16; |
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} |
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if ((bits32 & 0xff) == 0) { |
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bits32 >>= 8; |
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i += 8; |
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} |
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if ((bits32 & 0xf) == 0) { |
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bits32 >>= 4; |
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i += 4; |
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} |
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if ((bits32 & 0x3) == 0) { |
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bits32 >>= 2; |
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i += 2; |
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} |
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if ((bits32 & 0x1) == 0) |
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i += 1; |
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|
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return (i); |
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} |
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|
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int |
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ffs(int bits) |
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{ |
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return (ffs_impl((uint64_t)(uint_t)bits)); |
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} |
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|
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int |
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ffsl(long bits) |
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{ |
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return (ffs_impl((uint64_t)(ulong_t)bits)); |
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} |
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|
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int |
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ffsll(long long bits) |
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{ |
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return (ffs_impl((uint64_t)(u_longlong_t)bits)); |
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} |