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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [libc/] [addr2ascii.c] - Rev 30
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/* * 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 $ * * $Id: addr2ascii.c,v 1.2 2001-09-27 12:01:53 chris 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; }
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