#include <u.h>#include <libc.h> #define between(x,min,max)	(((min-1-x) & (x-max-1))>>8) intenc16chr(int o){	int c; 	c  = between(o,  0,  9) & ('0'+o);	c |= between(o, 10, 15) & ('A'+(o-10));	return c;} intdec16chr(int c){	int o; 	o  = between(c, '0', '9') & (1+(c-'0'));	o |= between(c, 'A', 'F') & (1+10+(c-'A'));	o |= between(c, 'a', 'f') & (1+10+(c-'a'));	return o-1;}