1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 3 #ifndef _COMMONLIB_RATIONAL_H_ 4 #define _COMMONLIB_RATIONAL_H_ 5 6 #include <stddef.h> 7 8 /* 9 * Calculate the best rational approximation for a given fraction, 10 * with the restriction of maximum numerator and denominator. 11 * For example, to find the approximation of 3.1415 with 5 bit denominator 12 * and 8 bit numerator fields: 13 * 14 * rational_best_approximation(31415, 10000, 15 * (1 << 8) - 1, (1 << 5) - 1, &n, &d); 16 */ 17 void rational_best_approximation( 18 unsigned long numerator, unsigned long denominator, 19 unsigned long max_numerator, unsigned long max_denominator, 20 unsigned long *best_numerator, unsigned long *best_denominator); 21 22 #endif /* _COMMONLIB_RATIONAL_H_ */ 23