use static

Signed-off-by: 李昂 <liang6516@outlook.com>

package/pika_libc/pika_vsnprintf.c

@@ -486,18 +486,20 @@ struct scaling_factor {
                     // to divide by it
 };
 
-double apply_scaling(double num, struct scaling_factor normalization) {
+static double apply_scaling(double num, struct scaling_factor normalization) {
     return normalization.multiply ? num * normalization.raw_factor
                                   : num / normalization.raw_factor;
 }
 
-double unapply_scaling(double normalized, struct scaling_factor normalization) {
+static double unapply_scaling(double normalized,
+                              struct scaling_factor normalization) {
     return normalization.multiply ? normalized / normalization.raw_factor
                                   : normalized * normalization.raw_factor;
 }
 
-struct scaling_factor update_normalization(struct scaling_factor sf,
-                                           double extra_multiplicative_factor) {
+static struct scaling_factor update_normalization(
+    struct scaling_factor sf,
+    double extra_multiplicative_factor) {
     struct scaling_factor result;
     if (sf.multiply) {
         result.multiply = true;
@@ -1256,7 +1258,10 @@ static int __vsnprintf(out_fct_type out,
  *
  * @return The number of characters actually written to buffer.
  */
-int pika_vsnprintf(char* buf, rt_size_t size, const char* fmt, va_list args) {
+static int pika_vsnprintf(char* buf,
+                          rt_size_t size,
+                          const char* fmt,
+                          va_list args) {
     return __vsnprintf(out_buffer, buf, size, fmt, args);
 }