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int i;
ssize_t count = 0;

for (i = 0; i < 9; ++i)
  count += 
    sprintf(buf + count, "%02x ", ((u8 *)&slreg_num)[i]);
count += sprintf(buf + count, "\n");

...

errno_t sprintf_m(
  string_m buf, 
  const string_m fmt, 
  int *count, 
  ...
);

The sprintf_m() API separates out the return status of the function from information about the number of characters written. In this case, *count is set to the number of characters written in buf, while the return value indicates the return status. Returning the status as the return value of the function increases the likelihood that a programmer will check the return status of the function.

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