Move printing log prefix into a separate function

Reduces code size a bit and makes it cleaner

PUBLISHED_FROM=c08064102dc64f59dcdc1f80655f32e1ed94c850

mongoose.c

@@ -361,23 +361,24 @@ FILE *cs_log_file = NULL;
 double cs_log_ts;
 #endif
 
-void cs_log_printf(const char *fmt, ...) {
-  va_list ap;
-#ifdef CS_LOG_TS_DIFF
-  double now = cs_time();
-#endif
-
+void cs_log_print_prefix(const char *func) {
   if (cs_log_file == NULL) cs_log_file = stderr;
+  fprintf(cs_log_file, "%-20s ", func);
 #ifdef CS_LOG_TS_DIFF
-  fprintf(cs_log_file, "%7u ", (unsigned int) ((now - cs_log_ts) * 1000000));
+  {
+    double now = cs_time();
+    fprintf(cs_log_file, "%7u ", (unsigned int) ((now - cs_log_ts) * 1000000));
+    cs_log_ts = now;
+  }
 #endif
+}
+
+void cs_log_printf(const char *fmt, ...) {
+  va_list ap;
   va_start(ap, fmt);
   vfprintf(cs_log_file, fmt, ap);
   va_end(ap);
   fputc('\n', cs_log_file);
-#ifdef CS_LOG_TS_DIFF
-  cs_log_ts = now;
-#endif
   fflush(cs_log_file);
 }
 #endif /* !CS_DISABLE_STDIO */

mongoose.h

@@ -646,19 +646,20 @@ void cs_log_set_level(enum cs_log_level level);
 void cs_log_set_file(FILE *file);
 
 extern enum cs_log_level cs_log_level;
+void cs_log_print_prefix(const char *func);
 void cs_log_printf(const char *fmt, ...);
 
-#define LOG(l, x)                      \
-  if (cs_log_level >= l) {             \
-    cs_log_printf("%-20s ", __func__); \
-    cs_log_printf x;                   \
+#define LOG(l, x)                  \
+  if (cs_log_level >= l) {         \
+    cs_log_print_prefix(__func__); \
+    cs_log_printf x;               \
   }
 
 #ifndef CS_NDEBUG
 
 #define DBG(x)                            \
   if (cs_log_level >= LL_VERBOSE_DEBUG) { \
-    cs_log_printf("%-20s ", __func__);    \
+    cs_log_print_prefix(__func__);        \
     cs_log_printf x;                      \
   }