degesch: add & use strncasecmp_ascii()

common.c

@@ -70,6 +70,17 @@ str_vector_find (const struct str_vector *v, const char *s)
 	return -1;
 }
 
+static int
+strncasecmp_ascii (const char *a, const char *b, size_t n)
+{
+	int x;
+	while (n-- && (*a || *b))
+		if ((x = tolower_ascii (*(const unsigned char *) a++)
+			- tolower_ascii (*(const unsigned char *) b++)))
+			return x;
+	return 0;
+}
+
 // --- Logging -----------------------------------------------------------------
 
 static void