buffer_getline_sa - read line from buffer
int buffer_getline_sa(buffer* b,stralloc* sa);
buffer_getline_sa appends data from the b
until a '\n' is
found, NOT overwriting the previous content of sa
. The new-line is also
appended to sa
If reading from the buffer or allocating memory fails, buffer_getline_sa returns
-1 and sets errno
appropriately. At that point sa
may be empty
or it may already contain a partial token.
-1 on error (setting errno), 0 on EOF, 1 when successful.
buffer_getline_sa appends instead of overwriting so it can be used on
non-blocking sockets (these signal error and set errno
to EAGAIN; in
this case you can simply call buffer_getline_sa again when select
indicate more data is available).