log_printf: Restructured log_printf for wrapping (espressif#7567)

Author: sanketwadekar

cores/esp32/esp32-hal-uart.c

@@ -496,21 +496,18 @@ int uartGetDebug()
  return s_uart_debug_nr;
 }
 
-int log_printf(const char *format, ...)
+int log_printfv(const char *format, va_list arg)
 {
  static char loc_buf[64];
  char * temp = loc_buf;
  int len;
- va_list arg;
  va_list copy;
- va_start(arg, format);
  va_copy(copy, arg);
  len = vsnprintf(NULL, 0, format, copy);
  va_end(copy);
  if(len >= sizeof(loc_buf)){
  temp = (char*)malloc(len+1);
  if(temp == NULL) {
- va_end(arg);
  return 0;
  }
  }
@@ -528,13 +525,22 @@ int log_printf(const char *format, ...)
  xSemaphoreGive(_uart_bus_array[s_uart_debug_nr].lock);
  }
 #endif
- va_end(arg);
  if(len >= sizeof(loc_buf)){
  free(temp);
  }
  return len;
 }
 
+int log_printf(const char *format, ...)
+{
+ int len;
+ va_list arg;
+ va_start(arg, format);
+ len = log_printfv(format, arg);
+ va_end(arg);
+ return len;
+}
+
 
 static void log_print_buf_line(const uint8_t *b, size_t len, size_t total_len){
  for(size_t i = 0; i<len; i++){