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#include <u.h>
#include <libc.h>
typedef struct DMS DMS;
struct DMS
{
vlong d; /* degrees (°) */
vlong m; /* minutes (') */
double s; /* seconds (") */
};
#pragma varargck type "D" DMS
int
Dfmt(Fmt *f)
{
DMS dms;
dms = va_arg(f->args, DMS);
if(dms.d < 0){
dms.m = -dms.m;
dms.s = -dms.s;
}
return fmtprint(f, "%lld°%lld'%g\"", dms.d, dms.m, dms.s);
}
DMS
deg2dms(double deg)
{
DMS dms;
dms.d = deg;
deg -= dms.d;
dms.m = deg = deg*60;
deg -= dms.m;
dms.s = deg*60;
return dms;
}
double
dms2deg(DMS dms)
{
return dms.d + dms.m/60.0 + dms.s/3600.0;
}
void
usage(void)
{
fprint(2, "usage: %s deg\n", argv0);
exits("usage");
}
void
main(int argc, char *argv[])
{
DMS dms;
Rune r;
char *s;
double degs;
fmtinstall('D', Dfmt);
ARGBEGIN{
default: usage();
}ARGEND;
if(argc != 1)
usage();
s = argv[0];
degs = strtod(s, &s);
if(*s != 0){
memset(&dms, 0, sizeof(DMS));
while(*s != 0){
s += chartorune(&r, s);
switch(r){
case L'°':
dms.d = degs;
degs = strtod(s, &s);
break;
case '\'':
dms.m = dms.d < 0? -degs: degs;
degs = strtod(s, &s);
break;
case '\"':
dms.s = dms.d < 0? -degs: degs;
break;
default:
sysfatal("unknown format");
}
}
degs = dms2deg(dms);
print("%g°\n", degs);
}else{
dms = deg2dms(degs);
print("%D\n", dms);
}
exits(0);
}
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