Joshua Brindle | 13cd4c8 | 2008-08-19 15:30:36 -0400 | [diff] [blame] | 1 | |
| 2 | /* Author : Stephen Smalley, <sds@epoch.ncsc.mil> */ |
| 3 | |
| 4 | /* FLASK */ |
| 5 | |
| 6 | /* |
| 7 | * A double-ended queue is a singly linked list of |
| 8 | * elements of arbitrary type that may be accessed |
| 9 | * at either end. |
| 10 | */ |
| 11 | |
| 12 | #ifndef _QUEUE_H_ |
| 13 | #define _QUEUE_H_ |
| 14 | |
| 15 | typedef void *queue_element_t; |
| 16 | |
| 17 | typedef struct queue_node *queue_node_ptr_t; |
| 18 | |
| 19 | typedef struct queue_node { |
| 20 | queue_element_t element; |
| 21 | queue_node_ptr_t next; |
| 22 | } queue_node_t; |
| 23 | |
| 24 | typedef struct queue_info { |
| 25 | queue_node_ptr_t head; |
| 26 | queue_node_ptr_t tail; |
| 27 | } queue_info_t; |
| 28 | |
| 29 | typedef queue_info_t *queue_t; |
| 30 | |
| 31 | queue_t queue_create(void); |
| 32 | int queue_insert(queue_t, queue_element_t); |
| 33 | int queue_push(queue_t, queue_element_t); |
| 34 | queue_element_t queue_remove(queue_t); |
| 35 | queue_element_t queue_head(queue_t); |
| 36 | void queue_destroy(queue_t); |
| 37 | |
| 38 | /* |
| 39 | Applies the specified function f to each element in the |
| 40 | specified queue. |
| 41 | |
| 42 | In addition to passing the element to f, queue_map |
| 43 | passes the specified void* pointer to f on each invocation. |
| 44 | |
| 45 | If f returns a non-zero status, then queue_map will cease |
| 46 | iterating through the hash table and will propagate the error |
| 47 | return to its caller. |
| 48 | */ |
| 49 | int queue_map(queue_t, int (*f) (queue_element_t, void *), void *); |
| 50 | |
| 51 | /* |
| 52 | Same as queue_map, except that if f returns a non-zero status, |
| 53 | then the element will be removed from the queue and the g |
| 54 | function will be applied to the element. |
| 55 | */ |
| 56 | void queue_map_remove_on_error(queue_t, |
| 57 | int (*f) (queue_element_t, void *), |
| 58 | void (*g) (queue_element_t, void *), void *); |
| 59 | |
| 60 | #endif |
| 61 | |
| 62 | /* FLASK */ |