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Diffstat (limited to 'util.h')
| -rw-r--r-- | util.h | 80 |
1 files changed, 80 insertions, 0 deletions
@@ -0,0 +1,80 @@ +/* + * Copyright (c) 2007,2008 Paulo Cesar Pereira de Andrade + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + * + * Author: Paulo Cesar Pereira de Andrade + */ + +/* Generic hash table */ + +#ifndef _util_h +#define _util_h + +/* + * Types + */ +typedef struct _hash_key hash_key; +typedef struct _hash_entry hash_entry; +typedef struct _hash_table hash_table; +typedef int (*hash_compare)(hash_key *left, hash_key *right); + +struct _hash_key { + char *value; + unsigned int length; +}; + +struct _hash_entry { + hash_key *key; + hash_entry *next; +}; + +struct _hash_table { + hash_entry **entries; + unsigned int count; /* length of entries */ + unsigned int length; /* sum of entries */ + hash_compare compare; + + struct { + int offset; + hash_entry *entry; + } iter; +}; + +/* + * Prototypes + */ +hash_table *hash_new(unsigned int length, hash_compare compare); +hash_entry *hash_put(hash_table *hash, hash_entry *entry); +hash_entry *hash_get(hash_table *hash, hash_key *name); +hash_entry * hash_check(hash_table *hash, char *name, unsigned int length); +void hash_rem(hash_table *hash, hash_entry *entry); +/* Removes from hash table but doesn't release any memory */ +hash_entry *hash_rem_no_free(hash_table *hash, hash_entry *entry); +void hash_rehash(hash_table *hash, unsigned int length); +hash_entry *hash_iter_first(hash_table *hash); +hash_entry *hash_iter_next(hash_table *hash); + +/* Frees all data. When casting to another type, use the + * iterator to free extra data */ +void hash_clr(hash_table *hash); +void hash_del(hash_table *hash); + +#endif /* _util_h */ |