Printf.h

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#pragma once
#include "Print.h"
#include "dlna_config.h"
namespace tiny_dlna {
 
class Printf {
 public:
  Printf(Print& out) { p_print = &out; }
 
  size_t printf(const char* fmt, ...) {
    char buf[MAX_PRINTF_SIZE];
    va_list args;
    va_start(args, fmt);
    int n = vsnprintf(buf, sizeof(buf), fmt, args);
    va_end(args);
    if (n <= 0) return 0;
    // vsnprintf returns the number of characters that would have been
    // written if the buffer were large enough. Assert buffer was sufficient.
    assert(n < (int)sizeof(buf));
    int toWrite = n;
    if (toWrite >= (int)sizeof(buf)) toWrite = (int)sizeof(buf) - 1;
    // Return the actual bytes written by the Print object (which may expand
    // characters when using wrappers like EscapingPrint)
    size_t written = p_print->write((const uint8_t*)buf, (size_t)toWrite);
    return written;
  }
 
 protected:
  Print* p_print = nullptr;
};
 
}  // namespace tiny_dlna