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77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
#ifndef _STX_COMMON_H_
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#define _STX_COMMON_H_
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#include <stddef.h>
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#include <stdlib.h>
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#define STX_BEGIN_MACRO {
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#define STX_END_MACRO }
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/*****************************************
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* Circular linked list definitions
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*/
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typedef struct _stx_clist {
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struct _stx_clist *next;
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struct _stx_clist *prev;
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} stx_clist_t;
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/* Insert element "_e" into the list, before "_l" */
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#define STX_CLIST_INSERT_BEFORE(_e,_l) \
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STX_BEGIN_MACRO \
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(_e)->next = (_l); \
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(_e)->prev = (_l)->prev; \
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(_l)->prev->next = (_e); \
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(_l)->prev = (_e); \
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STX_END_MACRO
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/* Insert element "_e" into the list, after "_l" */
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#define STX_CLIST_INSERT_AFTER(_e,_l) \
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STX_BEGIN_MACRO \
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(_e)->next = (_l)->next; \
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(_e)->prev = (_l); \
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(_l)->next->prev = (_e); \
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(_l)->next = (_e); \
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STX_END_MACRO
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/* Append an element "_e" to the end of the list "_l" */
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#define STX_CLIST_APPEND_LINK(_e,_l) STX_CLIST_INSERT_BEFORE(_e,_l)
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/* Remove the element "_e" from it's circular list */
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#define STX_CLIST_REMOVE_LINK(_e) \
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STX_BEGIN_MACRO \
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(_e)->prev->next = (_e)->next; \
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(_e)->next->prev = (_e)->prev; \
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STX_END_MACRO
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/* Return the head/tail of the list */
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#define STX_CLIST_HEAD(_l) (_l)->next
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#define STX_CLIST_TAIL(_l) (_l)->prev
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/* Return non-zero if the given circular list "_l" is empty, */
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/* zero if the circular list is not empty */
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#define STX_CLIST_IS_EMPTY(_l) \
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((_l)->next == (_l))
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/* Initialize a circular list */
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#define STX_CLIST_INIT_CLIST(_l) \
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STX_BEGIN_MACRO \
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(_l)->next = (_l); \
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(_l)->prev = (_l); \
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STX_END_MACRO
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/*****************************************
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* Useful macros
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*/
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#ifndef offsetof
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#define offsetof(type, identifier) ((size_t)&(((type *)0)->identifier))
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#endif
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#define STX_MIN(a, b) (((a) < (b)) ? (a) : (b))
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#endif /* !_STX_COMMON_H_ */
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