diff options
Diffstat (limited to 'REORG.TODO/inet/inet_netof.c')
| -rw-r--r-- | REORG.TODO/inet/inet_netof.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/REORG.TODO/inet/inet_netof.c b/REORG.TODO/inet/inet_netof.c new file mode 100644 index 0000000000..ef6281d29f --- /dev/null +++ b/REORG.TODO/inet/inet_netof.c @@ -0,0 +1,50 @@ +/* + * Copyright (c) 1983, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/param.h> +#include <netinet/in.h> +#include <arpa/inet.h> + +/* + * Return the network number from an internet + * address; handles class a/b/c network #'s. + */ +in_addr_t +inet_netof (struct in_addr in) +{ + u_int32_t i = ntohl(in.s_addr); + + if (IN_CLASSA(i)) + return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT); + else if (IN_CLASSB(i)) + return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT); + else + return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT); +} +libc_hidden_def (inet_netof) |