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Rewrite casting to be more safe.

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Patrick Pelissier committed 2017-02-27 20:47:47 +01:00
1 parent 6c888f9b68
commit bf9714e00a
1 file changed
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m-i-list.h
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@@ -84,11 +84,9 @@
/* /*
* From a pointer to a 'field_type' 'field' of a 'type'structure, * From a pointer to a 'field_type' 'field' of a 'type'structure,
* return pointer to the structure. * return pointer to the structure.
* Note: Lot of cast. Can be unsafe.
*/ */
#define ILISTI_TYPE_FROM_FIELD(type, ptr, field_type, field) \ #define ILISTI_TYPE_FROM_FIELD(type, ptr, field_type, field) \
( ( (void)((ptr) == (field_type*)(ptr))) , \ ((type *)(void*)( (char *)M_ASSIGN_CAST(field_type*, (ptr)) - offsetof(type, field) ))
((type *)(void*)( (char *)(ptr) - offsetof(type, field) )) )
#define ILISTI_DEF2(name, type, oplist, check_instance) \ #define ILISTI_DEF2(name, type, oplist, check_instance) \
typedef struct M_C3(ilist_head_, name, _s) M_C3(ilist_, name, _t)[1]; \ typedef struct M_C3(ilist_head_, name, _s) M_C3(ilist_, name, _t)[1]; \