47 lines
1.2 KiB
C++
47 lines
1.2 KiB
C++
#include <cstdarg>
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//#include <stdarg.h>
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#include "mbed.h"
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#include "mbed/xprintf.h"
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#define STRING_STACK_LIMIT 120
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/* mbed Serial */
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Serial ser(UART_TX, UART_RX);
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/* TODO: Need small implementation for embedded */
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int xprintf(const char* format, ...)
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{
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/* copy from mbed/common/RawSerial.cpp */
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std::va_list arg;
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va_start(arg, format);
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int len = vsnprintf(NULL, 0, format, arg);
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if (len < STRING_STACK_LIMIT) {
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char temp[STRING_STACK_LIMIT];
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vsprintf(temp, format, arg);
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ser.puts(temp);
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} else {
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char *temp = new char[len + 1];
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vsprintf(temp, format, arg);
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ser.puts(temp);
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delete[] temp;
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}
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va_end(arg);
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return len;
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/* Fail: __builtin_va_arg_pack?
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* https://gcc.gnu.org/onlinedocs/gcc-4.3.5/gcc/Constructing-Calls.html#Constructing-Calls
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void *arg = __builtin_apply_args();
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void *ret = __builtin_apply((void*)(&(ser.printf)), arg, 100);
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__builtin_return(ret)
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*/
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/* Fail: varargs can not be passed to printf
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//int r = ser.printf("test %i\r\n", 123);
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va_list arg;
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va_start(arg, format);
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int r = ser.printf(format, arg);
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va_end(arg);
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return r;
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*/
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}
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