ardupilot/libraries/Desktop/support/util.h

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#define ft2m(x) ((x) * 0.3048)
#define kt2mps(x) ((x) * 0.514444444)
#define sqr(x) ((x)*(x))
void set_nonblocking(int fd);
double normalise(double v, double min, double max);
double normalise180(double v);