3a480dc910
This helper returns the number of registered callbacks for an hook. Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
88 lines
3.2 KiB
C
88 lines
3.2 KiB
C
/*
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* kmscon - Miscellaneous Helpers
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*
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* Copyright (c) 2011 David Herrmann <dh.herrmann@googlemail.com>
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* Copyright (c) 2011 University of Tuebingen
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* Miscellaneous Helpers
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* This provides several helper objects like memory-rings or similar.
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*/
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#ifndef KMSCON_MISC_H
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#define kMSCON_MISC_H
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#include <stdbool.h>
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#include <stdlib.h>
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/* ring buffer for arbitrary byte-streams */
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struct kmscon_ring;
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int kmscon_ring_new(struct kmscon_ring **out);
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void kmscon_ring_free(struct kmscon_ring *ring);
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bool kmscon_ring_is_empty(struct kmscon_ring *ring);
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int kmscon_ring_write(struct kmscon_ring *ring, const char *val, size_t len);
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const char *kmscon_ring_peek(struct kmscon_ring *ring, size_t *len);
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void kmscon_ring_drop(struct kmscon_ring *ring, size_t len);
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/* callback hooks */
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struct kmscon_hook;
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typedef void (*kmscon_hook_cb) (void *parent, void *arg, void *data);
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int kmscon_hook_new(struct kmscon_hook **out);
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void kmscon_hook_free(struct kmscon_hook *hook);
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unsigned int kmscon_hook_num(struct kmscon_hook *hook);
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int kmscon_hook_add(struct kmscon_hook *hook, kmscon_hook_cb cb, void *data);
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void kmscon_hook_rm(struct kmscon_hook *hook, kmscon_hook_cb cb, void *data);
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void kmscon_hook_call(struct kmscon_hook *hook, void *parent, void *arg);
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#define kmscon_hook_add_cast(hook, cb, data) \
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kmscon_hook_add((hook), (kmscon_hook_cb)(cb), (data))
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#define kmscon_hook_rm_cast(hook, cb, data) \
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kmscon_hook_rm((hook), (kmscon_hook_cb)(cb), (data))
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/* hash-tables */
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struct kmscon_hashtable;
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typedef unsigned int (*kmscon_hash_cb) (const void *data);
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typedef int (*kmscon_equal_cb) (const void *data1, const void *data2);
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typedef void (*kmscon_free_cb) (void *data);
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unsigned int kmscon_direct_hash(const void *data);
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int kmscon_direct_equal(const void *data1, const void *data2);
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int kmscon_hashtable_new(struct kmscon_hashtable **out,
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kmscon_hash_cb hash_cb,
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kmscon_equal_cb equal_cb,
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kmscon_free_cb free_key,
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kmscon_free_cb free_value);
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void kmscon_hashtable_free(struct kmscon_hashtable *tbl);
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int kmscon_hashtable_insert(struct kmscon_hashtable *tbl, void *key,
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void *data);
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bool kmscon_hashtable_find(struct kmscon_hashtable *tbl, void **out, void *key);
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#endif /* KMSCON_MISC_H */
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