Integrate new IP type from Tom Ivar Helbekkmo.

src/backend/utils/adt/inet_net_ntop.c

@@ -0,0 +1,137 @@
+/*
+ * 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 rcsid[] = "$Id: inet_net_ntop.c,v 1.1 1998/10/03 05:40:48 momjian Exp $";
+
+#endif
+
+#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(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(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);
+}