gistfile1.diff

diff --git a/src/test.cpp b/src/test.cpp
index e609fe2..ddbcee7 100644
--- a/src/test.cpp
+++ b/src/test.cpp
@@ -164,6 +164,10 @@ struct TestUtilities: public TestBase
 		UASSERT(is_yes("YeS") == true);
 		UASSERT(is_yes("") == false);
 		UASSERT(is_yes("FAlse") == false);
+		UASSERT(is_yes("-1") == true);
+		UASSERT(is_yes("0") == false);
+		UASSERT(is_yes("1") == true);
+		UASSERT(is_yes("2") == true);
 		const char *ends[] = {"abc", "c", "bc", NULL};
 		UASSERT(removeStringEnd("abc", ends) == "");
 		UASSERT(removeStringEnd("bc", ends) == "b");
diff --git a/src/util/string.h b/src/util/string.h
index 6c48ade..428b1ad 100644
--- a/src/util/string.h
+++ b/src/util/string.h
@@ -143,10 +143,23 @@ inline std::string lowercase(const std::string &s)
 	return s2;
 }
 
+inline bool is_nonzero_number(const std::string &s)
+{
+	for(size_t i=0; i<s.size(); i++){
+		if(i == 0 && s[i] == '-')
+			continue;
+		else if(s[i] >= '1' && s[i] <= '9')
+			return true;
+		else if(s[i] != '0')
+			return false;
+	}
+	return false;
+}
+
 inline bool is_yes(const std::string &s)
 {
 	std::string s2 = lowercase(trim(s));
-	if(s2 == "y" || s2 == "yes" || s2 == "true" || s2 == "1")
+	if(s2 == "y" || s2 == "yes" || s2 == "true" || is_nonzero_number(s2))
 		return true;
 	return false;
 }