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r_offsetof: use offsetof (#10957)

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It cannot be portably implemented in standard C. The null pointer dereference is a common implementation but actually an undefined behavior which asan will report runtime error: member access within null pointer of type ...
This commit is contained in:
Fangrui Song 2018-08-07 03:28:06 -07:00 committed by radare
parent e569149450
commit ca300e73db
1 changed files with 2 additions and 1 deletions
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3
libr/include/r_types.h
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@ -4,6 +4,7 @@
// defines like IS_DIGIT, etc'
#include "r_util/r_str_util.h"
#include "r_userconf.h"
#include <stddef.h>
// TODO: fix this to make it crosscompile-friendly: R_SYS_OSTYPE ?
/* operating system */
@ -330,7 +331,7 @@ static inline void *r_new_copy(int size, void *data) {
#endif
#undef r_offsetof
#define r_offsetof(type, member) ((unsigned long) &((type*)0)->member)
#define r_offsetof(type, member) offsetof(type, member)
#define R_BETWEEN(x,y,z) (((y)>=(x)) && ((y)<=(z)))
#define R_ROUND(x,y) ((x)%(y))?(x)+((y)-((x)%(y))):(x)