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85 lines
1.5 KiB
C
85 lines
1.5 KiB
C
#ifndef EL__UTIL_MATH_H
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#define EL__UTIL_MATH_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* It's evil to include this directly, elinks.h includes it for you
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* at the right time. */
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/* These macros will evaluate twice their arguments.
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* Ie. MIN(a+b, c+d) will do 3 additions...
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* Please prefer to use int_min() and int_max() if possible. */
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/* FreeBSD needs this. */
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#ifdef MIN
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#undef MIN
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#endif
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#ifdef MAX
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#undef MAX
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#endif
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#define MIN(x, y) ((x) < (y) ? (x) : (y))
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#define MAX(x, y) ((x) > (y) ? (x) : (y))
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static inline int
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int_min(int x, int y)
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{
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if (x < y) return x;
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return y;
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}
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static inline int
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int_max(int x, int y)
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{
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if (x > y) return x;
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return y;
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}
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/** Limit @a what pointed value to upper bound @a limit. */
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static inline void
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int_upper_bound(int *what, int limit)
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{
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if (*what > limit) *what = limit;
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}
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/** Limit @a what pointed value to lower bound @a limit. */
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static inline void
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int_lower_bound(int *what, int limit)
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{
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if (*what < limit) *what = limit;
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}
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/** Limit @a what pointed value to lower bound @a lower_limit and to
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* upper bound @a upper_limit. */
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static inline void
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int_bounds(int *what, int lower_limit,
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int upper_limit)
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{
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if (*what < lower_limit)
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*what = lower_limit;
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else if (*what > upper_limit)
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*what = upper_limit;
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}
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/** Swap values @a a and @a b, both of type @a type.
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* This is supposed to evaluate at compile time, giving no performance hit. */
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#define swap_values(type, a, b) \
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do { \
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type swap_register_ = (a); \
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(a) = (b); \
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(b) = (swap_register_); \
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} while (0)
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#ifdef __cplusplus
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}
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#endif
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#endif
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