Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Implementation of the symbol table type. |
| 3 | * |
| 4 | * Author : Stephen Smalley, <sds@epoch.ncsc.mil> |
| 5 | */ |
| 6 | #include <linux/kernel.h> |
| 7 | #include <linux/slab.h> |
| 8 | #include <linux/string.h> |
| 9 | #include <linux/errno.h> |
| 10 | #include "symtab.h" |
| 11 | |
| 12 | static unsigned int symhash(struct hashtab *h, void *key) |
| 13 | { |
| 14 | char *p, *keyp; |
| 15 | unsigned int size; |
| 16 | unsigned int val; |
| 17 | |
| 18 | val = 0; |
| 19 | keyp = key; |
| 20 | size = strlen(keyp); |
| 21 | for (p = keyp; (p - keyp) < size; p++) |
| 22 | val = (val << 4 | (val >> (8*sizeof(unsigned int)-4))) ^ (*p); |
| 23 | return val & (h->size - 1); |
| 24 | } |
| 25 | |
| 26 | static int symcmp(struct hashtab *h, void *key1, void *key2) |
| 27 | { |
| 28 | char *keyp1, *keyp2; |
| 29 | |
| 30 | keyp1 = key1; |
| 31 | keyp2 = key2; |
| 32 | return strcmp(keyp1, keyp2); |
| 33 | } |
| 34 | |
| 35 | |
| 36 | int symtab_init(struct symtab *s, unsigned int size) |
| 37 | { |
| 38 | s->table = hashtab_create(symhash, symcmp, size); |
| 39 | if (!s->table) |
| 40 | return -1; |
| 41 | s->nprim = 0; |
| 42 | return 0; |
| 43 | } |
| 44 | |