RELEASE/1.1RELEASE/1.2debug-cidebug-ci-sanitisersstereowalls-data
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[693388e] | 1 | /* hash.c */ |
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| 2 | /* String hashing function */ |
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[e1b99fc] | 3 | /* Copyright (C) 1995-2002 Olly Betts |
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[693388e] | 4 | * |
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| 5 | * This program is free software; you can redistribute it and/or modify |
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| 6 | * it under the terms of the GNU General Public License as published by |
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| 7 | * the Free Software Foundation; either version 2 of the License, or |
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| 8 | * (at your option) any later version. |
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| 9 | * |
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| 10 | * This program is distributed in the hope that it will be useful, |
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 13 | * GNU General Public License for more details. |
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| 14 | * |
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| 15 | * You should have received a copy of the GNU General Public License |
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| 16 | * along with this program; if not, write to the Free Software |
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[ecbc6c18] | 17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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[693388e] | 18 | */ |
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| 19 | |
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| 20 | #include <ctype.h> |
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| 21 | |
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[63dc4eb] | 22 | #include "debug.h" |
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[693388e] | 23 | #include "hash.h" |
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| 24 | |
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| 25 | /* some (preferably prime) number for the hashing function */ |
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| 26 | #define HASH_PRIME 29363 |
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| 27 | |
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| 28 | int |
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| 29 | hash_string(const char *p) |
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| 30 | { |
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| 31 | int hash; |
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[4c07c51] | 32 | SVX_ASSERT(p); |
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[693388e] | 33 | for (hash = 0; *p; p++) |
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| 34 | hash = (hash * HASH_PRIME + *(const unsigned char*)p) & 0x7fff; |
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| 35 | return hash; |
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| 36 | } |
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| 37 | |
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| 38 | int |
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| 39 | hash_lc_string(const char *p) |
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| 40 | { |
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| 41 | int hash; |
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[4c07c51] | 42 | SVX_ASSERT(p); |
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[693388e] | 43 | for (hash = 0; *p; p++) |
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| 44 | hash = (hash * HASH_PRIME + tolower(*(const unsigned char*)p)) & 0x7fff; |
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| 45 | return hash; |
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| 46 | } |
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[e1b99fc] | 47 | |
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| 48 | int |
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| 49 | hash_data(const char *p, size_t len) |
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| 50 | { |
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| 51 | int hash; |
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[4c07c51] | 52 | SVX_ASSERT(p); |
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[e1b99fc] | 53 | for (hash = 0; len--; p++) |
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| 54 | hash = (hash * HASH_PRIME + *(const unsigned char*)p) & 0x7fff; |
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| 55 | return hash; |
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| 56 | } |
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