Libc-320.tar.gz

[apple/libc.git] / net / FreeBSD / addr2ascii.c

diff --git a/net/FreeBSD/addr2ascii.c b/net/FreeBSD/addr2ascii.c
new file mode 100644 (file)
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--- /dev/null
+++ b/net/FreeBSD/addr2ascii.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright 1996 Massachusetts Institute of Technology
+ *
+ * Permission to use, copy, modify, and distribute this software and
+ * its documentation for any purpose and without fee is hereby
+ * granted, provided that both the above copyright notice and this
+ * permission notice appear in all copies, that both the above
+ * copyright notice and this permission notice appear in all
+ * supporting documentation, and that the name of M.I.T. not be used
+ * in advertising or publicity pertaining to distribution of the
+ * software without specific, written prior permission.  M.I.T. makes
+ * no representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied
+ * warranty.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
+ * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
+ * SHALL M.I.T. 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.
+ *
+ *     $ANA: addr2ascii.c,v 1.1 1996/06/13 18:41:46 wollman Exp $
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: src/lib/libc/net/addr2ascii.c,v 1.2 2002/03/22 21:52:28 obrien Exp $");
+
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <errno.h>
+#include <string.h>
+
+#include <net/if_dl.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+/*-
+ * Convert a network address from binary to printable numeric format.
+ * This API is copied from INRIA's IPv6 implementation, but it is a
+ * bit bogus in two ways:
+ *
+ *     1) There is no value in passing both an address family and
+ *        an address length; either one should imply the other,
+ *        or we should be passing sockaddrs instead.
+ *     2) There should by contrast be /added/ a length for the buffer
+ *        that we pass in, so that programmers are spared the need to
+ *        manually calculate (read: ``guess'') the maximum length.
+ *
+ * Flash: the API is also the same in the NRL implementation, and seems to
+ * be some sort of standard, so we appear to be stuck with both the bad
+ * naming and the poor choice of arguments.
+ */
+char *
+addr2ascii(af, addrp, len, buf)
+       int af;
+       const void *addrp;
+       int len;                /* should be size_t XXX */
+       char *buf;              /* XXX should pass length of buffer */
+{
+       static char staticbuf[64]; /* 64 for AF_LINK > 16 for AF_INET */
+
+       if (!buf)
+               buf = staticbuf;
+
+       switch(af) {
+       case AF_INET:
+               if (len != sizeof(struct in_addr)) {
+                       errno = ENAMETOOLONG;
+                       return 0;
+               }
+               strcpy(buf, inet_ntoa(*(const struct in_addr *)addrp));
+               break;
+
+       case AF_LINK:
+               if (len != sizeof(struct sockaddr_dl)) {
+                       errno = ENAMETOOLONG;
+                       return 0;
+               }
+               strcpy(buf, link_ntoa((const struct sockaddr_dl *)addrp));
+               break;
+                       
+       default:
+               errno = EPROTONOSUPPORT;
+               return 0;
+       }
+       return buf;
+}