Fix edge case bug in numlen, dropping use of math.h functions

(Specifically, numlen when called with INT_MIN gave an incorrect
result, because abs(INT_MIN) == INT_MIN < 0.)

1 files changed, 5 insertions, 4 deletions

diff --git a/common/util.c b/common/util.c
index 60f2f160..bd7bed2d 100644
--- a/common/util.c
+++ b/common/util.c
@@ -12,11 +12,12 @@ int wrap(int i, int max) {
 }
 
 int numlen(int n) {
-        if (n == 0) {
-                return 1;
+        int j = n <= 0 ? 1 : 0;
+        while (n) {
+                j++;
+                n /= 10;
         }
-        // Account for the '-' in negative numbers.
-        return log10(abs(n)) + (n > 0 ? 1 : 2);
+        return j;
 }
 
 uint32_t parse_color(const char *color) {