new file

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@6575 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/roken/inet_ntop.c

@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 1999 Kungliga Tekniska H<>gskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the Kungliga Tekniska
+ *      H<>gskolan and its contributors.
+ * 
+ * 4. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+RCSID("$Id$");
+#endif
+
+#include <errno.h>
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#ifdef HAVE_NETINET_IN6_H
+#include <netinet/in6.h>
+#endif
+#ifdef HAVE_NETINET6_IN6_H
+#include <netinet6/in6.h>
+#endif
+
+#include <roken.h>
+
+/*
+ *
+ */
+
+static const char *
+inet_ntop_v4 (const void *src, char *dst, size_t size)
+{
+    const char digits[] = "0123456789";
+    int i;
+    struct in_addr *addr = (struct in_addr *)src;
+    u_long a = addr->s_addr;
+    const char *orig_dst = dst;
+
+    if (size < INET_ADDRSTRLEN) {
+	errno = ENOSPC;
+	return NULL;
+    }
+    for (i = 0; i < 4; ++i) {
+	int n = (a >> (24 - i * 8)) & 0xFF;
+	int non_zerop = 0;
+
+	if (non_zerop || n / 100 > 0) {
+	    *dst++ = digits[n / 100];
+	    n %= 100;
+	    non_zerop = 1;
+	}
+	if (non_zerop || n / 10 > 0) {
+	    *dst++ = digits[n / 10];
+	    n %= 10;
+	    non_zerop = 1;
+	}
+	*dst++ = digits[n];
+	if (i != 3)
+	    *dst++ = '.';
+    }
+    *dst++ = '\0';
+    return orig_dst;
+}
+
+#ifdef HAVE_IPV6
+static const char *
+inet_ntop_v6 (const void *src, char *dst, size_t size)
+{
+    const char xdigits[] = "0123456789abcdef";
+    int i;
+    const struct in6_addr *addr = (struct in6_addr *)src;
+    const u_char *ptr = addr->s6_addr;
+    const char *orig_dst = dst;
+
+    if (size < INET6_ADDRSTRLEN) {
+	errno = ENOSPC;
+	return NULL;
+    }
+    for (i = 0; i < 8; ++i) {
+	int non_zerop = 1;
+
+	if (non_zerop || (ptr[0] >> 4)) {
+	    *dst++ = xdigits[ptr[0] >> 4];
+	    non_zerop = 1;
+	}
+	if (non_zerop || (ptr[0] & 0x0F)) {
+	    *dst++ = xdigits[ptr[0] & 0x0F];
+	    non_zerop = 1;
+	}
+	if (non_zerop || (ptr[1] >> 4)) {
+	    *dst++ = xdigits[ptr[1] >> 4];
+	    non_zerop = 1;
+	}
+	if (non_zerop || (ptr[1] & 0x0F)) {
+	    *dst++ = xdigits[ptr[1] & 0x0F];
+	    non_zerop = 1;
+	}
+	if (i != 7)
+	    *dst++ = ':';
+	ptr += 2;
+    }
+    *dst++ = '\0';
+    return orig_dst;
+}
+#endif /* HAVE_IPV6 */
+
+const char *
+inet_ntop(int af, const void *src, char *dst, size_t size)
+{
+    switch (af) {
+    case AF_INET :
+	return inet_ntop_v4 (src, dst, size);
+#ifdef HAVE_IPV6
+    case AF_INET6 :
+	return inet_ntop_v6 (src, dst, size);
+#endif
+    default :
+	errno = EAFNOSUPPORT;
+	return NULL;
+    }
+}