bson_strdupv_printf()
Synopsis
char *
bson_strdupv_printf (const char *format,
                     va_list     args) BSON_GNUC_PRINTF (1, 0);Parameters
| format | A printf style format string. | 
| args | A va_list. | 
Description
This function is like bson_strdup_printf() except takes a va_list of parameters.
Returns
A newly allocated string that should be freed with bson_free().