libssh2_knownhost_writeline - convert a known host to a line for
struct libssh2_knownhost *known,
char *buffer, size_t buflen,
Converts a single known host to a single line of output for storage,
using the ’type’ output format.
known identifies which particular known host
buffer points to an allocated buffer
buflen is the size of the buffer. See RETURN VALUE about the size.
outlen must be a pointer to a size_t variable that will get the output
length of the stored data chunk. The number does not included the
type specifies what file type it is, and LIBSSH2_KNOWNHOST_FILE_OPENSSH
is the only currently supported format.
Returns a regular libssh2 error code, where negative values are error
codes and 0 indicates success.
If the provided buffer is deemed too small to fit the data libssh2
wants to store in it, LIBSSH2_ERROR_BUFFER_TOO_SMALL will be returned.
The application is then advised to call the function again with a
larger buffer. The outlen size will then hold the requested size.
Added in libssh2 1.2