faster-cavernloglog-selectwalls-datawalls-data-hanging-as-warning
Last change
on this file since 91a758c was
ed953f1,
checked in by Olly Betts <olly@…>, 2 months ago
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Adjust annotations to work with older clang
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-
Property mode set to
100644
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File size:
1.7 KB
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Rev | Line | |
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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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[30ec602] | 28 | #ifdef __clang__ |
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[ed953f1] | 29 | __attribute__((no_sanitize("unsigned-integer-overflow"))) |
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[30ec602] | 30 | #endif |
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[693388e] | 31 | int |
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| 32 | hash_string(const char *p) |
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| 33 | { |
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| 34 | int hash; |
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[4c07c51] | 35 | SVX_ASSERT(p); |
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[693388e] | 36 | for (hash = 0; *p; p++) |
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| 37 | hash = (hash * HASH_PRIME + *(const unsigned char*)p) & 0x7fff; |
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| 38 | return hash; |
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| 39 | } |
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| 40 | |
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[30ec602] | 41 | #ifdef __clang__ |
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[ed953f1] | 42 | __attribute__((no_sanitize("unsigned-integer-overflow"))) |
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[30ec602] | 43 | #endif |
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[693388e] | 44 | int |
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| 45 | hash_lc_string(const char *p) |
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| 46 | { |
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| 47 | int hash; |
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[4c07c51] | 48 | SVX_ASSERT(p); |
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[693388e] | 49 | for (hash = 0; *p; p++) |
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| 50 | hash = (hash * HASH_PRIME + tolower(*(const unsigned char*)p)) & 0x7fff; |
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| 51 | return hash; |
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| 52 | } |
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[e1b99fc] | 53 | |
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[30ec602] | 54 | #ifdef __clang__ |
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[ed953f1] | 55 | __attribute__((no_sanitize("unsigned-integer-overflow"))) |
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[30ec602] | 56 | #endif |
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[e1b99fc] | 57 | int |
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| 58 | hash_data(const char *p, size_t len) |
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| 59 | { |
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| 60 | int hash; |
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[4c07c51] | 61 | SVX_ASSERT(p); |
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[e1b99fc] | 62 | for (hash = 0; len--; p++) |
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| 63 | hash = (hash * HASH_PRIME + *(const unsigned char*)p) & 0x7fff; |
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| 64 | return hash; |
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| 65 | } |
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