Libc-320.tar.gz

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

diff --git a/net/FreeBSD/inet_net_ntop.c b/net/FreeBSD/inet_net_ntop.c
new file mode 100644 (file)
index 0000000..b97428a
--- /dev/null
+++ b/net/FreeBSD/inet_net_ntop.c
@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 1996 by Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static const char orig_rcsid[] = "From Id: inet_net_ntop.c,v 8.2 1996/08/08 06:54:44 vixie Exp";
+#endif
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: src/lib/libc/net/inet_net_ntop.c,v 1.7 2002/03/22 21:52:29 obrien Exp $");
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#ifdef SPRINTF_CHAR
+# define SPRINTF(x) strlen(sprintf/**/x)
+#else
+# define SPRINTF(x) ((size_t)sprintf x)
+#endif
+
+static char *  inet_net_ntop_ipv4(const u_char *src, int bits, char *dst,
+                   size_t size);
+
+/*
+ * char *
+ * inet_net_ntop(af, src, bits, dst, size)
+ *     convert network number from network to presentation format.
+ *     generates CIDR style result always.
+ * return:
+ *     pointer to dst, or NULL if an error occurred (check errno).
+ * author:
+ *     Paul Vixie (ISC), July 1996
+ */
+char *
+inet_net_ntop(af, src, bits, dst, size)
+       int af;
+       const void *src;
+       int bits;
+       char *dst;
+       size_t size;
+{
+       switch (af) {
+       case AF_INET:
+               return (inet_net_ntop_ipv4(src, bits, dst, size));
+       default:
+               errno = EAFNOSUPPORT;
+               return (NULL);
+       }
+}
+
+/*
+ * static char *
+ * inet_net_ntop_ipv4(src, bits, dst, size)
+ *     convert IPv4 network number from network to presentation format.
+ *     generates CIDR style result always.
+ * return:
+ *     pointer to dst, or NULL if an error occurred (check errno).
+ * note:
+ *     network byte order assumed.  this means 192.5.5.240/28 has
+ *     0x11110000 in its fourth octet.
+ * author:
+ *     Paul Vixie (ISC), July 1996
+ */
+static char *
+inet_net_ntop_ipv4(src, bits, dst, size)
+       const u_char *src;
+       int bits;
+       char *dst;
+       size_t size;
+{
+       char *odst = dst;
+       char *t;
+       u_int m;
+       int b;
+
+       if (bits < 0 || bits > 32) {
+               errno = EINVAL;
+               return (NULL);
+       }
+       if (bits == 0) {
+               if (size < sizeof "0")
+                       goto emsgsize;
+               *dst++ = '0';
+               *dst = '\0';
+       }
+
+       /* Format whole octets. */
+       for (b = bits / 8; b > 0; b--) {
+               if (size < sizeof "255.")
+                       goto emsgsize;
+               t = dst;
+               dst += SPRINTF((dst, "%u", *src++));
+               if (b > 1) {
+                       *dst++ = '.';
+                       *dst = '\0';
+               }
+               size -= (size_t)(dst - t);
+       }
+
+       /* Format partial octet. */
+       b = bits % 8;
+       if (b > 0) {
+               if (size < sizeof ".255")
+                       goto emsgsize;
+               t = dst;
+               if (dst != odst)
+                       *dst++ = '.';
+               m = ((1 << b) - 1) << (8 - b);
+               dst += SPRINTF((dst, "%u", *src & m));
+               size -= (size_t)(dst - t);
+       }
+
+       /* Format CIDR /width. */
+       if (size < sizeof "/32")
+               goto emsgsize;
+       dst += SPRINTF((dst, "/%u", bits));
+       return (odst);
+
+ emsgsize:
+       errno = EMSGSIZE;
+       return (NULL);
+}
+
+/*
+ * Weak aliases for applications that use certain private entry points,
+ * and fail to include <arpa/inet.h>.
+ */
+#undef inet_net_ntop
+__weak_reference(__inet_net_ntop, inet_net_ntop);