i32 csdbg::util::va_size ( const i8 *  fmt, va_list  args  )

static

Compute the size of a printf-style format string expanded with the values of a variable argument list.

Parameters

[in]	fmt	a printf-style format string
[in]	args	a variable argument list (as a va_list variable)

Returns

the computed size (not including the trailing '\0')

Exceptions

csdbg::exception

Definition at line 489 of file util.cpp.

References unlikely.

Referenced by csdbg::string::format(), and va_format().

{
  if ( unlikely(fmt == NULL) ) {
    va_end(args);
    throw exception("invalid argument: fmt (=%p)", fmt);
  }

  i32 retval = vsnprintf(NULL, 0, fmt, args);
  va_end(args);
  if ( unlikely(retval < 0) )
    throw exception("vsnprintf failed with retval %d", retval);

  return retval;
}

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