3 files changed, 16 insertions, 0 deletions
diff --git a/shared/consts.h b/shared/consts.h
index cd6dff1..11e6d14 100644
--- a/shared/consts.h
+++ b/shared/consts.h
@@ -35,6 +35,10 @@
 /** max time between ping and answer */
 #define W2_PING_TIMEOUT (5e3)
 
+/** default map width/height */
+#define W2_MAP_DEFAULT_HEIGHT 5
+#define W2_MAP_DEFAULT_WIDTH 5
+
 /** front-facing distance sensor pinout */
 #define W2_FRONT_SENSOR_PIN 5
 /** battery voltage sensor pinout */
diff --git a/shared/util.c b/shared/util.c
index 68503e8..641b4d9 100644
--- a/shared/util.c
+++ b/shared/util.c
@@ -6,3 +6,11 @@ unsigned long w2_util_exp_mov_avg(unsigned long current_avg, unsigned long new_m
 }
 
 int w2_sign(int n) { return (n > 0) - (n < 0); }
+
+unsigned int w2_newline_count(char *str, unsigned int len) {
+	unsigned int newlines = 0;
+	for (unsigned int i = 0; i < len; i++)
+		if (str[i] == '\n') newlines++;
+	return newlines;
+}
+
diff --git a/shared/util.h b/shared/util.h
index 230c3e4..806af3a 100644
--- a/shared/util.h
+++ b/shared/util.h
@@ -6,5 +6,9 @@
 #define W2_MAX(a, b) (((a) > (b)) ? (a) : (b))
 #define W2_RANGE(min, val, max) W2_MIN(max, W2_MAX(val, min))
 
+/** calculate exponential moving average */
 unsigned long w2_util_exp_mov_avg(unsigned long current_avg, unsigned long new_meas);
+/** return the sign of a number (-1 or 1) */
 int w2_sign(int n);
+/** return amount of newline characters */
+unsigned int w2_newline_count(char *str, unsigned int len);