1/*********************************************************************** 2* * 3* This software is part of the ast package * 4* Copyright (c) 1985-2010 AT&T Intellectual Property * 5* and is licensed under the * 6* Common Public License, Version 1.0 * 7* by AT&T Intellectual Property * 8* * 9* A copy of the License is available at * 10* http://www.opensource.org/licenses/cpl1.0.txt * 11* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12* * 13* Information and Software Systems Research * 14* AT&T Research * 15* Florham Park NJ * 16* * 17* Glenn Fowler <gsf@research.att.com> * 18* David Korn <dgk@research.att.com> * 19* Phong Vo <kpv@research.att.com> * 20* * 21***********************************************************************/ 22#pragma prototyped 23/* 24 * Glenn Fowler 25 * AT&T Research 26 * 27 * hash table library 28 */ 29 30#include "hashlib.h" 31 32/* 33 * change table size and rehash 34 * size must be a power of 2 35 */ 36 37void 38hashsize(register Hash_table_t* tab, int size) 39{ 40 register Hash_bucket_t** old_s; 41 register Hash_bucket_t** new_s; 42 register Hash_bucket_t* old_b; 43 register Hash_bucket_t* new_b; 44 Hash_bucket_t** old_sx; 45 unsigned int index; 46 Hash_region_f region; 47 void* handle; 48 49 if (size > 0 && size != tab->size && !(size & (size - 1))) 50 { 51 if (region = tab->root->local->region) 52 { 53 handle = tab->root->local->handle; 54 new_s = (Hash_bucket_t**)(*region)(handle, NiL, sizeof(Hash_bucket_t*) * size, 0); 55 } 56 else new_s = newof(0, Hash_bucket_t*, size, 0); 57 if (!new_s) tab->flags |= HASH_FIXED; 58 else 59 { 60 old_sx = (old_s = tab->table) + tab->size; 61 tab->size = size; 62 while (old_s < old_sx) 63 { 64 old_b = *old_s++; 65 while (old_b) 66 { 67 new_b = old_b; 68 old_b = old_b->next; 69 index = new_b->hash; 70 HASHMOD(tab, index); 71 new_b->next = new_s[index]; 72 new_s[index] = new_b; 73 } 74 } 75 if ((tab->flags & (HASH_RESIZE|HASH_STATIC)) != HASH_STATIC) 76 { 77 if (region) (*region)(handle, tab->table, 0, 0); 78 else free(tab->table); 79 } 80 tab->table = new_s; 81 tab->flags |= HASH_RESIZE; 82 } 83 } 84} 85