Nils Olav Selåsdal
57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
#ifndef UCORE_UTILS_H_
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#define UCORE_UTILS_H_
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#include <stddef.h>
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//Gnerate a compiler error if the compile time
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//constant expression fails
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#define STATIC_ASSERT(expr) \
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do { \
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enum { assert_static__ = 1/(expr) }; \
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} while (0)
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#ifdef DEBUG
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#define TRACEF(fmt, args...)
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do { \
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fprintf(stdout, "%s:%d (%s)\t" fmt, __FILE__, __LINE__, __FUNCTION__, ##args);\
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fflush(stdout);\
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} while(0)
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#else
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#define TRACEF(fmt, ...)
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#endif
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//MAX of a and b
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#define UC_MAX(a,b) \
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({ __typeof__ (a) _a = (a); \
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__typeof__ (b) _b = (b); \
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_a > _b ? _a : _b; })
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//min of a and b
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#define UC_MIN(a,b) \
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({ __typeof__ (a) _a = (a); \
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__typeof__ (b) _b = (b); \
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_a < _b ? _a : _b; })
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#define ARRAY_SIZE(a) (sizeof(a) / sizeof(*a))
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//given 'ptr' as a pointer to a struct 'member',
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//find the struct that ptr is the member of, where
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//'type' is the type of the containing struct
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//e.g.
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//struct foo {
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// int i;
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// struct bar zap;
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//};
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// ...
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//struct bar *p = ..; //the local p is a pointer to
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//a 'zap' member inside a struct foo.
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//give us the struct foo*:
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//struct foo *f = CONTAINER_OF(p, struct foo, zap);
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#define CONTAINER_OF(ptr, type, member) ({ \
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typeof( ((type *)0)->member ) *__mptr = (ptr); \
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(type *)( (void *)__mptr - offsetof(type, member) ); })
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#define UC_ALIGN(val,align) (((val)+(align)-1UL)&~((align)-1UL))
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#endif
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