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Diffstat (limited to 'src/commonlib/include/commonlib/rational.h')
| -rw-r--r-- | src/commonlib/include/commonlib/rational.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/commonlib/include/commonlib/rational.h b/src/commonlib/include/commonlib/rational.h new file mode 100644 index 000000000000..f172e0b191ec --- /dev/null +++ b/src/commonlib/include/commonlib/rational.h @@ -0,0 +1,22 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#ifndef _COMMONLIB_RATIONAL_H_ +#define _COMMONLIB_RATIONAL_H_ + +#include <stddef.h> + +/* + * Calculate the best rational approximation for a given fraction, + * with the restriction of maximum numerator and denominator. + * For example, to find the approximation of 3.1415 with 5 bit denominator + * and 8 bit numerator fields: + * + * rational_best_approximation(31415, 10000, + * (1 << 8) - 1, (1 << 5) - 1, &n, &d); + */ +void rational_best_approximation( + unsigned long numerator, unsigned long denominator, + unsigned long max_numerator, unsigned long max_denominator, + unsigned long *best_numerator, unsigned long *best_denominator); + +#endif /* _COMMONLIB_RATIONAL_H_ */ |