=pod

=head1 NAME

BIO_parse_hostserv - utility routines to parse a standard host and service
string

=head1 SYNOPSIS

 #include <openssl/bio.h>

 enum BIO_hostserv_priorities {
     BIO_PARSE_PRIO_HOST, BIO_PARSE_PRIO_SERV
 };
 int BIO_parse_hostserv(const char *hostserv, char **host, char **service,
                        enum BIO_hostserv_priorities hostserv_prio);

=head1 DESCRIPTION

BIO_parse_hostserv() will parse the information given in B<hostserv>,
create strings with the host name and service name and give those
back via B<host> and B<service>.  Those will need to be freed after
they are used.  B<hostserv_prio> helps determine if B<hostserv> shall
be interpreted primarily as a host name or a service name in ambiguous
cases.

The syntax the BIO_parse_hostserv() recognises is:

 host + ':' + service
 host + ':' + '*'
 host + ':'
        ':' + service
 '*'  + ':' + service
 host
 service

The host part can be a name or an IP address.  If it's a IPv6
address, it MUST be enclosed in brackets, such as '[::1]'.

The service part can  be a service name or its port number.

The returned values will depend on the given B<hostserv> string
and B<hostserv_prio>, as follows:

=for comment
The following is ONE verbatim block.  To make sure it's rendered as
one block and not several, the blank lines in between have one space.
They should be left as is.

 host + ':' + service  => *host = "host", *service = "service"
 host + ':' + '*'      => *host = "host", *service = NULL
 host + ':'            => *host = "host", *service = NULL
        ':' + service  => *host = NULL, *service = "service"
  '*' + ':' + service  => *host = NULL, *service = "service"
 
 in case no ':' is present in the string, the result depends on
 hostserv_prio, as follows:
 
 when hostserv_prio == BIO_PARSE_PRIO_HOST
 host                 => *host = "host", *service untouched
 
 when hostserv_prio == BIO_PARSE_PRIO_SERV
 service              => *host untouched, *service = "service"

=head1 SEE ALSO

L<BIO_ADDRINFO(3)>