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Where is the formatting buffer for printf?

I am working on a limited embedded system.

We are currently using a snprintfbuffer, then with a different statement we print a buffer for the serial port:

  char temp_buffer[256];
  int bytes_written = snprintf(temp_buffer, sizeof(temp_buffer),
                      "Solar system has %d planets\n",
                      10);
  if (bytes_written > 0)
  {
    Serial_Port_Output(temp_buffer, bytes_written);
  }

I want to switch to printffor direct recording to the serial port. In our compiler documentation, I intercepted a function call to output data to use the serial port. (The interface uses a block record: address and number of characters).

A function printfmay use a character buffer for formatting, such as integer or floating text.

Questions:

  • Where is the buffer that it printfuses for formatting? (Other questioning minds want to know before I make a change.)
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