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Add a new EVUTIL_UPCAST macro so that I do not need to keep figuring out the right offsetof magic over and over.
svn:r1160
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@ -39,6 +39,7 @@
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#include "defer-internal.h"
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#include "bufferevent-internal.h"
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#include "mm-internal.h"
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#include "util-internal.h"
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struct bufferevent_pair {
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struct bufferevent bev;
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@ -56,8 +57,7 @@ upcast(struct bufferevent *bev)
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struct bufferevent_pair *bev_p;
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if (bev->be_ops != &bufferevent_ops_pair)
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return NULL;
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bev_p = (void*)( ((char*)bev) -
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evutil_offsetof(struct bufferevent_pair, bev) );
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bev_p = EVUTIL_UPCAST(bev, struct bufferevent_pair, bev);
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assert(bev_p->bev.be_ops == &bufferevent_ops_pair);
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return bev_p;
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}
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@ -101,6 +101,9 @@ extern const char EVUTIL_TOLOWER_TABLE[];
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#define EVUTIL_TOLOWER(c) (EVUTIL_TOLOWER_TABLE[(ev_uint8_t)c])
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#define EVUTIL_TOUPPER(c) (EVUTIL_TOUPPER_TABLE[(ev_uint8_t)c])
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#define EVUTIL_UPCAST(ptr, type, field) \
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((type *)((char*)ptr) - evutil_offsetof(type, field))
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#ifdef __cplusplus
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}
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#endif
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