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