1 files changed, 89 insertions, 0 deletions
diff --git a/common-address.c b/common-address.c
new file mode 100644
index 0000000..8ad8712
--- /dev/null
+++ b/common-address.c
@@ -0,0 +1,89 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+int
+parse_coord(char *s, double *lat_min, double *lat_max, double *lon_min, double *lon_max)
+{
+        int withsign = 0, neg;
+	long int tmp;
+	double prec;
+
+	errno = 0;
+
+	if (s[0] == ':') {
+		*lat_min = -90;
+		*lat_max = +90;
+	} else {
+		prec = 1;
+		withsign = (s[0] == '-' || s[0] == '+');
+		neg = s[0] == '-';
+		s = &s[withsign];
+		tmp = 0;
+		if (isdigit(s[withsign])) {
+			tmp = strtol(s, &s, 0);
+			if (errno || tmp > INT_MAX)
+				return -1;
+		}
+		*lat_min = (double)tmp;
+		if (s[0] == '.') {
+			for (s++; isdigit(*s); s++) {
+				*lat_min *= 10;
+				*lat_min += (double)(*s & 15);
+				prec *= 10;
+			}
+			*lat_min /= prec;
+		}
+		if (!withsign && (s[0] == 'N' || s[0] == 'S')) {
+			neg = s[0] == 'S';
+			s = &s[1];
+		}
+		if (neg)
+			*lat_min = -*lat_min;
+		prec = (1 / prec) / 2;
+		*lat_max = *lat_min + prec;
+		*lat_min -= prec;
+		if (s[0] != ':')
+			return -1;
+	}
+
+	s = &s[1];
+
+	if (!s[0]) {
+		*lon_min = -180;
+		*lon_max = +180;
+	} else {
+		prec = 1;
+		withsign = (s[0] == '-' || s[0] == '+');
+		neg = s[0] == '-';
+		s = &s[withsign];
+		tmp = 0;
+		if (isdigit(s[withsign])) {
+			tmp = strtol(s, &s, 0);
+			if (errno || tmp > INT_MAX)
+				return -1;
+		}
+		*lon_min = (double)tmp;
+		if (s[0] == '.') {
+			for (s++; isdigit(*s); s++) {
+				*lon_min *= 10;
+				*lon_min += (double)(*s & 15);
+				prec *= 10;
+			}
+			*lon_min /= prec;
+		}
+		if (!withsign && (s[0] == 'E' || s[0] == 'W')) {
+			neg = s[0] == 'W';
+			s = &s[1];
+		}
+		if (neg)
+			*lon_min = -*lon_min;
+		prec = (1 / prec) / 2;
+		*lon_max = *lon_min + prec;
+		*lon_min -= prec;
+		if (s[0])
+			return -1;
+	}
+
+	return 0;
+}