[PATCH 113/114] Add implementation of inet_ntop function for Phoenix.

[Jakub Sejdak <jakub dot sejdak at phoesys dot com>]

From: Kuba Sejdak <jakub.sejdak@phoesys.com>

---
 newlib/libc/sys/phoenix/net/inet_ntop.c | 171 ++++++++++++++++++++++++++++++++
 1 file changed, 171 insertions(+)
 create mode 100644 newlib/libc/sys/phoenix/net/inet_ntop.c

diff --git a/newlib/libc/sys/phoenix/net/inet_ntop.c b/newlib/libc/sys/phoenix/net/inet_ntop.c
new file mode 100644
index 0000000..5ad0711
--- /dev/null
+++ b/newlib/libc/sys/phoenix/net/inet_ntop.c
@@ -0,0 +1,171 @@
+/* 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.
+ */
+
+/* Author: Paul Vixie, 1996 */
+/* Copied from Linux, modified for Phoenix-RTOS. */
+
+#include <arpa/inet.h>
+#include <arpa/nameser.h>
+#include <errno.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+#define SPRINTF(x) ((socklen_t) sprintf x)
+
+/*
+ * WARNING: Don't even consider trying to compile this on a system where
+ * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
+ */
+
+static const char *inet_ntop4(const u_char *src, char *dst, socklen_t size)
+{
+	static const char fmt[] = "%u.%u.%u.%u";
+	char tmp[sizeof "255.255.255.255"];
+
+	if (SPRINTF((tmp, fmt, src[0], src[1], src[2], src[3])) > size) {
+		errno = ENOSPC;
+		return NULL;
+	}
+
+	strcpy(dst, tmp);
+	return dst;
+}
+
+static const char *inet_ntop6(const u_char *src, char *dst, socklen_t size)
+{
+	/*
+	 * Note that int32_t and int16_t need only be "at least" large enough
+	 * to contain a value of the specified size.  On some systems, like
+	 * Crays, there is no such thing as an integer variable with 16 bits.
+	 * Keep this in mind if you think this function should have been coded
+	 * to use pointer overlays.  All the world's not a VAX.
+	 */
+	char tmp[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")], *tp;
+	struct {
+		int base, len;
+	} best, cur;
+	u_int words[NS_IN6ADDRSZ / NS_INT16SZ];
+	int i;
+	/*
+	 * Preprocess:
+	 *	Copy the input (bytewise) array into a wordwise array.
+	 *	Find the longest run of 0x00's in src[] for :: shorthanding.
+	 */
+	memset(words, '\0', sizeof words);
+
+	for (i = 0; i < NS_IN6ADDRSZ; i++)
+		words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
+
+	best.base = -1;
+	cur.base = -1;
+
+	for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
+		if (words[i] == 0) {
+			if (cur.base == -1)
+				cur.base = i, cur.len = 1;
+
+			else
+				cur.len++;
+		}
+
+		else {
+			if (cur.base != -1) {
+				if (best.base == -1 || cur.len > best.len)
+					best = cur;
+
+				cur.base = -1;
+			}
+		}
+	}
+
+	if (cur.base != -1) {
+		if (best.base == -1 || cur.len > best.len)
+			best = cur;
+	}
+
+	if (best.base != -1 && best.len < 2)
+		best.base = -1;
+
+	/*
+	 * Format the result.
+	 */
+	tp = tmp;
+
+	for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
+		/* Are we inside the best run of 0x00's? */
+		if (best.base != -1 && i >= best.base &&
+		        i < (best.base + best.len)) {
+			if (i == best.base)
+				*tp++ = ':';
+
+			continue;
+		}
+
+		/* Are we following an initial run of 0x00s or any real hex? */
+		if (i != 0)
+			*tp++ = ':';
+
+		/* Is this address an encapsulated IPv4? */
+		if (i == 6 && best.base == 0 &&
+		        (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) {
+			if (!inet_ntop4(src + 12, tp, sizeof tmp - (tp - tmp)))
+				return NULL;
+
+			tp += strlen(tp);
+			break;
+		}
+
+		tp += SPRINTF((tp, "%x", words[i]));
+	}
+
+	/* Was it a trailing run of 0x00's? */
+	if (best.base != -1 && (best.base + best.len) ==
+	        (NS_IN6ADDRSZ / NS_INT16SZ))
+		*tp++ = ':';
+
+	*tp++ = '\0';
+
+	/*
+	 * Check for overflow, copy, and we're done.
+	 */
+	if ((socklen_t)(tp - tmp) > size) {
+		errno = ENOSPC;
+		return NULL;
+	}
+
+	strcpy(dst, tmp);
+	return dst;
+}
+
+const char *inet_ntop(int af, const void *src, char *dst, socklen_t size)
+{
+	switch (af) {
+	case AF_INET:
+		return inet_ntop4(src, dst, size);
+
+	case AF_INET6:
+		return inet_ntop6(src, dst, size);
+
+	default:
+		errno = EAFNOSUPPORT;
+		return NULL;
+	}
+
+	/* NOTREACHED */
+}
-- 
2.5.0