author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 04 Oct 2010 02:56:42 +0300 | |
changeset 68 | ff3fc7722556 |
parent 0 | e4d67989cc36 |
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/*- |
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* Copyright (c) 2005 David Schultz <das@FreeBSD.ORG> |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* © Portions copyright (c) 2005-2006 Nokia Corporation. All rights reserved. |
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*/ |
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|
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#include <sys/cdefs.h> |
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#ifndef __SYMBIAN32__ |
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__FBSDID("$FreeBSD: src/lib/libc/string/strcspn.c,v 1.5 2005/04/02 18:52:44 das Exp $"); |
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#endif |
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|
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#include <sys/types.h> |
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#include <limits.h> |
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#include <string.h> |
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|
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#define IDX(c) ((u_char)(c) / LONG_BIT) |
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#define BIT(c) ((u_long)1 << ((u_char)(c) % LONG_BIT)) |
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|
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EXPORT_C |
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size_t |
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strcspn(const char *s, const char *charset) |
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{ |
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/* |
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* NB: idx and bit are temporaries whose use causes gcc 3.4.2 to |
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* generate better code. Without them, gcc gets a little confused. |
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*/ |
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const char *s1; |
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u_long bit; |
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u_long tbl[(UCHAR_MAX + 1) / LONG_BIT]; |
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int idx; |
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|
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if(*s == '\0') |
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return (0); |
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|
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#if LONG_BIT == 64 /* always better to unroll on 64-bit architectures */ |
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tbl[0] = 1; |
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tbl[3] = tbl[2] = tbl[1] = 0; |
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#else |
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for (tbl[0] = idx = 1; idx < sizeof(tbl) / sizeof(tbl[0]); idx++) |
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tbl[idx] = 0; |
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#endif |
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for (; *charset != '\0'; charset++) { |
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idx = IDX(*charset); |
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bit = BIT(*charset); |
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tbl[idx] |= bit; |
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} |
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|
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for(s1 = s; ; s1++) { |
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idx = IDX(*s1); |
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bit = BIT(*s1); |
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if ((tbl[idx] & bit) != 0) |
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break; |
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} |
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return (s1 - s); |
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} |