common/mbed/xprintf.cpp

   1 #include <cstdarg>
   2 //#include <stdarg.h>
   3 #include "mbed.h"
   4 #include "mbed/xprintf.h"
   5
   6
   7 #define STRING_STACK_LIMIT    120
   8
   9 //TODO
  10 int xprintf(const char* format, ...) { return 0; }
  11
  12 #if 0
  13 /* mbed Serial */
  14 Serial ser(UART_TX, UART_RX);
  15
  16 /* TODO: Need small implementation for embedded */
  17 int xprintf(const char* format, ...)
  18 {
  19     /* copy from mbed/common/RawSerial.cpp */
  20     std::va_list arg;
  21     va_start(arg, format);
  22     int len = vsnprintf(NULL, 0, format, arg);
  23     if (len < STRING_STACK_LIMIT) {
  24         char temp[STRING_STACK_LIMIT];
  25         vsprintf(temp, format, arg);
  26         ser.puts(temp);
  27     } else {
  28         char *temp = new char[len + 1];
  29         vsprintf(temp, format, arg);
  30         ser.puts(temp);
  31         delete[] temp;
  32     }
  33     va_end(arg);
  34     return len;
  35
  36 /* Fail: __builtin_va_arg_pack?
  37  * https://gcc.gnu.org/onlinedocs/gcc-4.3.5/gcc/Constructing-Calls.html#Constructing-Calls
  38     void *arg = __builtin_apply_args();
  39     void *ret = __builtin_apply((void*)(&(ser.printf)), arg, 100);
  40     __builtin_return(ret)
  41 */
  42 /* Fail: varargs can not be passed to printf
  43     //int r = ser.printf("test %i\r\n", 123);
  44     va_list arg;
  45     va_start(arg, format);
  46     int r = ser.printf(format, arg);
  47     va_end(arg);
  48     return r;
  49 */
  50 }
  51 #endif