68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
#ifndef PI
|
|
# define PI 3.1415926535897932384626433832795029L
|
|
#endif
|
|
|
|
/*
|
|
* Note that all floating point calculations are rounded with .5 going up.
|
|
* Since C automatically truncates, adding .5 to every calculation does
|
|
* rounding for us nicely.
|
|
*
|
|
* To indicate unavailable data
|
|
* 999 is used for temperature
|
|
* x<0 is used for rh, pressure, and windspeed
|
|
*/
|
|
|
|
/* Calculations */
|
|
int rh_C(int temp_C, int dewpt_C);
|
|
int rh_F(int temp_F, int dewpt_F);
|
|
int heatindex_C(int temp_C, int rh);
|
|
int heatindex_F(int temp_F, int rh);
|
|
int windchill_C(int temp_C, int windspeed); /* knots */
|
|
int windchill_F(int temp_F, int windspeed); /* knots */
|
|
|
|
/* Length Conversions */
|
|
int in2cm(int in);
|
|
float m2mi(int meters);
|
|
|
|
/* Windspeed Conversions */
|
|
int knots2mph(int knots);
|
|
int knots2kph(int knots);
|
|
int knots2mps(int knots);
|
|
int knots2beaufort(int knots);
|
|
int kph2knots(int kph);
|
|
int mps2knots(int mps);
|
|
|
|
/* Temperature Conversions */
|
|
int temp_C2F(int temp_C);
|
|
int temp_F2C(int temp_F);
|
|
|
|
/* Pressure Conversions */
|
|
float inHg2mmHg(float inHg);
|
|
float inHg2hPa(float inHg);
|
|
float inHg2atm(float inHg);
|
|
float hPa2inHg(float hPa);
|
|
|
|
/* Time Conversions */
|
|
time_t mkgmtime(struct tm *tm);
|
|
int utc2local(int hm, int *mon, int *day, int *year, int *wday);
|
|
int local2utc(int hm, int *mon, int *day, int *year, int *wday);
|
|
void fix_date(int *month, int *day, int *year, int *wday);
|
|
int hm2min(int hm);
|
|
|
|
/* Letter Case (destructive!) */
|
|
char *str_upper(char *str);
|
|
char *str_lower(char *str);
|
|
|
|
/* Angle conversions */
|
|
double rad2deg(double angle);
|
|
double deg2rad(double angle);
|
|
|
|
/* Date conversions */
|
|
int mdy2doy(int mn, int dy, int y);
|
|
double mdy2jd(int year, int month, int day);
|
|
double jd2jcent(double jd);
|
|
double jcent2jd(double t);
|
|
|
|
/* Lat/Long conversions */
|
|
int str2dd(char *s, double *lat, double *lon);
|