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common: add ARRAY_SIZE() macro

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This commit is contained in:
Alejandro Mery 2012-05-12 13:38:59 +02:00
parent e36d38660b
commit 4977886293
1 changed files with 5 additions and 0 deletions
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common.h
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@ -32,6 +32,11 @@
#define container_of(P,T,M) (T *)((char *)(P) - offsetof(T, M))
#endif
/** calculate number of elements of an array */
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(A) (sizeof(A)/sizeof((A)[0]))
#endif
/** shortcut to printf to stderr */
#define errf(...) fprintf(stderr, __VA_ARGS__)