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defs.h: add offsetofend macro

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Analogous to offsetof but returns structure offset after the specified
field.  Useful for checking whether specific field is present in obtained
data or specifying amount of data to copy based on the (last) field needed.

* defs.h (offsetofend): New macro.
This commit is contained in:
Eugene Syromyatnikov 2016-09-03 14:41:33 +03:00
parent d212c95b84
commit 6e6c11d9dd
1 changed files with 5 additions and 0 deletions
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defs.h
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@ -68,6 +68,11 @@ const char *strerror(int);
extern char *stpcpy(char *dst, const char *src); extern char *stpcpy(char *dst, const char *src);
#endif #endif
#ifndef offsetofend
# define offsetofend(type, member) \
(offsetof(type, member) + sizeof(((type *)NULL)->member))
#endif
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
/* macros */ /* macros */