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#include <u.h>
#include <libc.h>
#include "dat.h"
Place nowhere = {
Undef, Undef
};
static void
setlat(Place *p, double lat)
{
p->lat = lat;
}
static void
setlon(Place *p, double lon)
{
p->lon = lon;
}
static int
printlatlon(char *p, int n, double lat, char po, char ne)
{
char c;
double d;
int deg, min, sec;
if(lat > 0)
c = po;
else if(lat < 0){
c = ne;
lat = -lat;
} else
c = ' ';
sec = 3600 * modf(lat, &d);
deg = d;
min = sec/60;
sec = sec % 60;
return snprint(p, n, "%#3.3d°%#2.2d′%#2.2d″%c", deg, min, sec, c);
}
int
placeconv(Fmt *fp)
{
char str[256];
int n;
Place pl;
pl = va_arg(fp->args, Place);
n = 0;
n += printlatlon(str+n, sizeof(str)-n, pl.lat, 'N', 'S');
n += snprint(str+n, sizeof(str)-n, ", ");
printlatlon(str+n, sizeof(str)-n, pl.lon, 'E', 'W');
return fmtstrcpy(fp, str);
}
int
strtolatlon(char *p, char **ep, Place *pl)
{
double latlon;
int neg = 0;
while(*p == '0') p++;
latlon = strtod(p, &p);
if(latlon < 0){
latlon = -latlon;
neg = 1;
}
if(*p == ':'){
p++;
while(*p == '0') p++;
latlon += strtod(p, &p)/60.0;
if(*p == ':'){
p++;
while(*p == '0') p++;
latlon += strtod(p, &p)/3600.0;
}
}
switch (*p++){
case 'N':
case 'n':
if(neg) latlon = -latlon;
if(pl->lat != Undef)
return -1;
setlat(pl, latlon);
break;
case 'S':
case 's':
if(!neg) latlon = -latlon;
if(pl->lat != Undef)
return -1;
setlat(pl, latlon);
break;
case 'E':
case 'e':
if(neg) latlon = -latlon;
if(pl->lon != Undef)
return -1;
setlon(pl, latlon);
break;
case 'W':
case 'w':
if(!neg) latlon = -latlon;
if(pl->lon != Undef)
return -1;
setlon(pl, latlon);
break;
case '\0':
case ' ':
case '\t':
case '\n':
p--;
if(neg) latlon = -latlon;
if(pl->lat == Undef){
setlat(pl, latlon);
} else if(pl->lon == Undef){
latlon = -latlon;
setlon(pl, latlon);
} else return -1;
break;
default:
return -1;
}
if(ep)
*ep = p;
return 0;
}
Place
strtopos(char *p, char **ep)
{
Place pl = nowhere;
if(strtolatlon(p, &p, &pl) < 0)
return nowhere;
while(*p == ' ' || *p == '\t' || *p == '\n')
p++;
if(strtolatlon(p, &p, &pl) < 0)
return nowhere;
if(ep)
*ep = p;
return pl;
}
static void
rtcset(long t) /* We may use this some day */
{
static int fd;
long r;
int n;
char buf[32];
if(fd <= 0 && (fd = open("#r/rtc", ORDWR)) < 0){
fprint(2, "Can't open #r/rtc: %r\n");
return;
}
n = read(fd, buf, sizeof buf - 1);
if(n <= 0){
fprint(2, "Can't read #r/rtc: %r\n");
return;
}
buf[n] = '\0';
r = strtol(buf, nil, 0);
if(r <= 0){
fprint(2, "ridiculous #r/rtc: %ld\n", r);
return;
}
if(r - t > 1 || t - r > 0){
seek(fd, 0, 0);
fprint(fd, "%ld", t);
fprint(2, "correcting #r/rtc: %ld → %ld\n", r, t);
}
seek(fd, 0, 0);
}
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