Appends len bytes of val to this.
If len is positive, val may contain embedded nuls and need not be nul-terminated. It is the caller's
responsibility to ensure that val has at least len addressable bytes.
If len is negative, val must be nul-terminated and len is considered to request the entire string
length. This makes append_len equivalent to append
.
| this | |
| val |
bytes to append |
| len |
number of bytes of |
|
this |