72 lines
1.3 KiB
C
72 lines
1.3 KiB
C
/*
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* ListMacs.h
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*
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* Macros for some simple list operations
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*
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* The parameters for the macros are :
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*
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* psHead the pointer to the start of the list
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* psEntry the pointer to the list entry
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* TYPE the type of the list structure (not a pointer to it)
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*
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*/
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#ifndef _listmacs_h
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#define _listmacs_h
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// initialise a list
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#define LIST_INIT(psHead) psHead = NULL
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// add an entry to the start of a list
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#define LIST_ADD(psHead, psEntry) \
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(psEntry)->psNext = (psHead); \
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(psHead) = (psEntry)
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// add an entry to a list
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#define LIST_ADDEND(psHead, psEntry, TYPE) \
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{ \
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TYPE *psPrev, *psCurr; \
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\
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psPrev = NULL; \
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for(psCurr = (psHead); psCurr; psCurr = psCurr->psNext) \
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{ \
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psPrev = psCurr; \
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} \
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if (psPrev) \
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{ \
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psPrev->psNext = (psEntry); \
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} \
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else \
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{ \
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(psEntry)->psNext = NULL; \
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(psHead) = (psEntry); \
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} \
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}
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// remove an entry from a list
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#define LIST_REMOVE(psHead, psEntry, TYPE) \
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{ \
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TYPE *psPrev, *psCurr; \
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\
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psPrev = NULL; \
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for(psCurr = (psHead); psCurr; psCurr = psCurr->psNext) \
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{ \
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if (psCurr == (psEntry)) \
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{ \
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break; \
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} \
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psPrev = psCurr; \
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} \
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ASSERT( psCurr!=NULL, "LIST_REMOVE: " __FILE__ "(%d): entry not found", __LINE__ ); \
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if (psPrev == NULL) \
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{ \
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(psHead) = (psHead)->psNext; \
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} \
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else if (psCurr != NULL) \
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{ \
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psPrev->psNext = psCurr->psNext; \
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} \
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}
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#endif
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