| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | /* |
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| 3 | * Implementation of the symbol table type. |
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| 4 | * |
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| 5 | * Author : Stephen Smalley, <stephen.smalley.work@gmail.com> |
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| 6 | */ |
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| 7 | #include <linux/kernel.h> |
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| 8 | #include <linux/string.h> |
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| 9 | #include <linux/errno.h> |
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| 10 | #include "symtab.h" |
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| 11 | |
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| 12 | static unsigned int symhash(const void *key) |
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| 13 | { |
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| 14 | const char *p, *keyp; |
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| 15 | unsigned int size; |
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| 16 | unsigned int val; |
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| 17 | |
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| 18 | val = 0; |
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| 19 | keyp = key; |
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| 20 | size = strlen(keyp); |
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| 21 | for (p = keyp; (p - keyp) < size; p++) |
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| 22 | val = (val << 4 | (val >> (8*sizeof(unsigned int)-4))) ^ (*p); |
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| 23 | return val; |
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| 24 | } |
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| 25 | |
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| 26 | static int symcmp(const void *key1, const void *key2) |
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| 27 | { |
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| 28 | const char *keyp1, *keyp2; |
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| 29 | |
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| 30 | keyp1 = key1; |
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| 31 | keyp2 = key2; |
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| 32 | return strcmp(keyp1, keyp2); |
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| 33 | } |
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| 34 | |
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| 35 | static const struct hashtab_key_params symtab_key_params = { |
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| 36 | .hash = symhash, |
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| 37 | .cmp = symcmp, |
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| 38 | }; |
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| 39 | |
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| 40 | int symtab_init(struct symtab *s, u32 size) |
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| 41 | { |
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| 42 | s->nprim = 0; |
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| 43 | return hashtab_init(h: &s->table, nel_hint: size); |
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| 44 | } |
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| 45 | |
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| 46 | int symtab_insert(struct symtab *s, char *name, void *datum) |
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| 47 | { |
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| 48 | return hashtab_insert(h: &s->table, key: name, datum, key_params: symtab_key_params); |
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| 49 | } |
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| 50 | |
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| 51 | void *symtab_search(struct symtab *s, const char *name) |
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| 52 | { |
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| 53 | return hashtab_search(h: &s->table, key: name, key_params: symtab_key_params); |
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| 54 | } |
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| 55 | |
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