| #ifndef lint |
| static char Rcs_Id[] = |
| "$Id$"; |
| #endif |
| |
| /* |
| * hash.c - a simple hash function for ispell |
| * |
| * Pace Willisson, 1983 |
| * |
| * Copyright 1992, 1993, Geoff Kuenning, Granada Hills, CA |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. All modifications to the source code must be clearly marked as |
| * such. Binary redistributions based on modified source code |
| * must be clearly marked as modified versions in the documentation |
| * and/or other materials provided with the distribution. |
| * 4. All advertising materials mentioning features or use of this software |
| * must display the following acknowledgment: |
| * This product includes software developed by Geoff Kuenning and |
| * other unpaid contributors. |
| * 5. The name of Geoff Kuenning may not be used to endorse or promote |
| * products derived from this software without specific prior |
| * written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY GEOFF KUENNING AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL GEOFF KUENNING OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| /* |
| * $Log$ |
| * Revision 1.1 2007/01/09 23:57:18 lattner |
| * initial recheckin of mibench |
| * |
| * Revision 1.1.1.1 2007/01/09 02:58:51 evancheng |
| * Add selected tests from MiBench 1.0 to LLVM test suite. |
| * |
| * Revision 1.20 1994/01/25 07:11:34 geoff |
| * Get rid of all old RCS log lines in preparation for the 3.1 release. |
| * |
| */ |
| |
| #include "config.h" |
| #include "ispell.h" |
| #include "proto.h" |
| |
| int hash P ((ichar_t * word, int hashtblsize)); |
| |
| /* |
| * The following hash algorithm is due to Ian Dall, with slight modifications |
| * by Geoff Kuenning to reflect the results of testing with the English |
| * dictionaries actually distributed with ispell. |
| */ |
| #define HASHSHIFT 5 |
| |
| #ifdef NO_CAPITALIZATION_SUPPORT |
| #define HASHUPPER(c) c |
| #else /* NO_CAPITALIZATION_SUPPORT */ |
| #define HASHUPPER(c) mytoupper(c) |
| #endif /* NO_CAPITALIZATION_SUPPORT */ |
| |
| int hash (s, hashtblsize) |
| register ichar_t * s; |
| register int hashtblsize; |
| { |
| register long h = 0; |
| register int i; |
| |
| #ifdef ICHAR_IS_CHAR |
| for (i = 4; i-- && *s != 0; ) |
| h = (h << 8) | HASHUPPER (*s++); |
| #else /* ICHAR_IS_CHAR */ |
| for (i = 2; i-- && *s != 0; ) |
| h = (h << 16) | HASHUPPER (*s++); |
| #endif /* ICHAR_IS_CHAR */ |
| while (*s != 0) |
| { |
| /* |
| * We have to do circular shifts the hard way, since C doesn't |
| * have them even though the hardware probably does. Oh, well. |
| */ |
| h = (h << HASHSHIFT) |
| | ((h >> (32 - HASHSHIFT)) & ((1 << HASHSHIFT) - 1)); |
| h ^= HASHUPPER (*s++); |
| } |
| return (unsigned long) h % hashtblsize; |
| } |