Fix precision bug of ftoa while exp is greater than 23

config.default.json.example

@@ -3,7 +3,7 @@
   "server_name" : "brubeck_debug",
   "dumpfile" : "./brubeck.dump",
   "capacity" : 15,
-  "expire" : 5,
+  "expire" : 20,
   "http" : ":8080",
 
   "backends" : [

src/utils.c

@@ -112,7 +112,7 @@ void url_to_inaddr2(struct sockaddr_in *addr, const char *url, int port)
 
 #define FLOAT_PRECISION 4
 
-int brubeck_itoa(char *ptr, uint32_t number)
+int brubeck_itoa(char *ptr, uint64_t number)
 {
 	char *origin = ptr;
 	int size;

src/utils.h

@@ -15,7 +15,7 @@ void sock_enlarge_in(int fd);
 
 char *find_substr(const char *s, const char *find, size_t slen);
 
-int brubeck_itoa(char *ptr, uint32_t number);
+int brubeck_itoa(char *ptr, uint64_t number);
 int brubeck_ftoa(char *outbuf, float f);
 
 static inline int starts_with(const char *str, const char *prefix)

tests/ftoa.c

@@ -18,4 +18,5 @@ void test_ftoa(void)
 	check_eq(1234.567, "1234.567");
 	check_eq(99999.999, "100000");
 	check_eq(0.999, "0.999");
+	check_eq(43427902563.12, "43427901440");
 }