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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.

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svn:r1160
This commit is contained in:
Nick Mathewson 2009-04-12 22:02:54 +00:00
parent bbd6a332e1
commit 0b47b125cf
2 changed files with 5 additions and 2 deletions
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4
bufferevent_pair.c
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@ -39,6 +39,7 @@
#include "defer-internal.h" #include "defer-internal.h"
#include "bufferevent-internal.h" #include "bufferevent-internal.h"
#include "mm-internal.h" #include "mm-internal.h"
#include "util-internal.h"
struct bufferevent_pair { struct bufferevent_pair {
struct bufferevent bev; struct bufferevent bev;
@ -56,8 +57,7 @@ upcast(struct bufferevent *bev)
struct bufferevent_pair *bev_p; struct bufferevent_pair *bev_p;
if (bev->be_ops != &bufferevent_ops_pair) if (bev->be_ops != &bufferevent_ops_pair)
return NULL; return NULL;
bev_p = (void*)( ((char*)bev) - bev_p = EVUTIL_UPCAST(bev, struct bufferevent_pair, bev);
evutil_offsetof(struct bufferevent_pair, bev) );
assert(bev_p->bev.be_ops == &bufferevent_ops_pair); assert(bev_p->bev.be_ops == &bufferevent_ops_pair);
return bev_p; return bev_p;
} }

3
util-internal.h
View File

@ -101,6 +101,9 @@ extern const char EVUTIL_TOLOWER_TABLE[];
#define EVUTIL_TOLOWER(c) (EVUTIL_TOLOWER_TABLE[(ev_uint8_t)c]) #define EVUTIL_TOLOWER(c) (EVUTIL_TOLOWER_TABLE[(ev_uint8_t)c])
#define EVUTIL_TOUPPER(c) (EVUTIL_TOUPPER_TABLE[(ev_uint8_t)c]) #define EVUTIL_TOUPPER(c) (EVUTIL_TOUPPER_TABLE[(ev_uint8_t)c])
#define EVUTIL_UPCAST(ptr, type, field) \
((type *)((char*)ptr) - evutil_offsetof(type, field))
#ifdef __cplusplus #ifdef __cplusplus
} }
#endif #endif