Nils O. Selåsdal
125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
#ifndef UC_UTILS_H_
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#define UC_UTILS_H_
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#include <stddef.h>
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#include <stdio.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 UC_STATIC_ASSERT(expr)\
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typedef int STATIC_ASSERT_FAILED[(expr) ? 1 : -1]
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//MAX of a and b
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#define UC_MAX(a,b) \
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({ __typeof__ (a) _amx = (a); \
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__typeof__ (b) _bmx = (b); \
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_amx > _bmx ? _amx : _bmx; })
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//min of a and b
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#define UC_MIN(a,b) \
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({ __typeof__ (a) _amn = (a); \
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__typeof__ (b) _bmn = (b); \
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_amn < _bmn ? _amn : _bmn; })
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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 UC_CONTAINER_OF(ptr, type, member) ({ \
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typeof( ((type *)0)->member ) *__mptr = (ptr); \
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(type *)((void *)(unsigned char *)__mptr - offsetof(type, member) ); })
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//the void* cast is to suppress alignment warnings
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//Same as UC_CONTAINER_OF, but for a const pointer to avoid gcc warnings..
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#define UC_CONST_CONTAINER_OF(ptr, type, member) ({ \
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const typeof( ((const type *)0)->member ) *__mptr = (ptr); \
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(const type *)((const void *)(const unsigned char *)__mptr - offsetof(const type, member) ); })
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/** Align a value.
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* @param val value to align
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* @param align alignment, must be power of 2
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* @return the aligned val
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*/
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#define UC_ALIGN(val,align) (((val)+(align)-1UL)&~((align)-1UL))
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/**
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* Test if x is a power of 2
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*
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* @param x value, must be an unsigned type
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* @return 1 if x is a power of 20, 0 if it is not
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*/
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#define UC_IS_POW2(x) ((x) && !((x) & (x) - 1))
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/**
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* Expands @x and turns it into a string.
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*/
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#define UC_STRINGIFY(x) UC_STRINGIFY_HLP(x)
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#define UC_STRINGIFY_HLP(x) #x
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/** Macro that expands to a string for the current file:line
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*/
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#define UC_SRC_LOCATION __FILE__ ":" UC_STRINGIFY(__LINE__)
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#ifdef DEBUG
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#define TRACEF(fmt, ...)\
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do { \
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fprintf(stdout, "%s (%s)\t" fmt, UC_SRC_LOCATION, __FUNCTION__, ##__VA_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, ...) do {} while(0)
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#endif
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/**
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* Round up x / y
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* (e.g 100/9 == 12, 3/2 == 2)
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* x + y must not overflow.
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*
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* @param x numerator, must be positive
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* @param y denominator
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* @return x/y rounded up
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*/
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#define UC_DIV_ROUND_UP(x, y) (((x) + ((y) - 1))/(y))
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/**
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* Round x up to nearest multiple of y
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* e.g. UC_ROUND_UP(30,48) == 48
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* e.g. UC_ROUND_UP(49,48) == 96
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*
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* @param x numerator, must be positive
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* @param y denominator
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* @return x rounded up to nearest multiple of y
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*/
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#define UC_ROUND_UP(x, y) (UC_DIV_ROUND_UP(x, y) * (y))
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/**
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* Round x down to nearest multiple of y
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* e.g. UC_ROUND_UP(30,48) == 0
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* e.g. UC_ROUND_UP(49,48) == 48
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*
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* @param x numerator, must be positive
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* @param y denominator
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* @return x rounded down nearest multiple of y
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*/
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#define UC_ROUND_DOWN(x, y) ((x) / (y) * (y))
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/** Indicate the variable is unused.
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*/
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#define UC_UNUSED(x) x __attribute__((unused))
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#endif
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