Add inet_ntop()

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4366 42af7a65-404d-4744-a932-0658087f49c3

ChangeLog

@@ -2444,4 +2444,5 @@
 	  RS-232 and SDIO due to pin conflicts.
 	* lib/string/lib_strcasestr.c:  Add strcasestr().
 	* lib/stdio/lib_avsprintf.c:  Add avsprintf().
+	* lib/net/lib_inetntop.c:  Add inet_ntop().
 

include/arpa/inet.h

@@ -49,6 +49,13 @@
 /****************************************************************************
  * Public Type Definitions
  ****************************************************************************/
+/*  Length of the string form for IP address (excludes NULL termination) */
+
+#define INET_ADDRSTRLEN 16
+
+/*  Length of the string form for IPv6 address (excludes NULL termination) */
+
+#define INET6_ADDRSTRLEN 46
 
 /* This macro to convert a 16/32-bit constant values quantity from host byte
  * order to network byte order.  The 16-bit version of this macro is required

lib/net/Make.defs

@@ -33,4 +33,4 @@
 #
 ############################################################################
 
-NET_SRCS = lib_htons.c lib_htonl.c lib_inetntoa.c lib_etherntoa.c lib_inetaddr.c
+NET_SRCS = lib_htons.c lib_htonl.c lib_inetntoa.c lib_inetntop.c lib_etherntoa.c lib_inetaddr.c

lib/net/lib_inetntoa.c

@@ -1,8 +1,8 @@
 /****************************************************************************
  * lib/net/lib_inetntoa.c
  *
- *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2008, 2011-2012 Gregory Nutt. All rights reserved.
- *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -41,6 +41,8 @@
 #include <stdio.h>
 #include <arpa/inet.h>
 
+#ifndef CONFIG_NET_IPv6
+
 /****************************************************************************
  * Global Functions
  ****************************************************************************/
@@ -59,7 +61,7 @@
 #ifdef CONFIG_CAN_PASS_STRUCTS
 FAR char *inet_ntoa(struct in_addr in)
 {
-  static char buffer[18];
+  static char buffer[INET_ADDRSTRLEN+2];
   FAR char *ptr = (FAR char*)&in.s_addr;
   sprintf(buffer, "%d.%d.%d.%d", ptr[0], ptr[1], ptr[2], ptr[3]);
   return buffer;
@@ -67,10 +69,11 @@ FAR char *inet_ntoa(struct in_addr in)
 #else
 FAR char *_inet_ntoa(in_addr_t in)
 {
-  static char buffer[18];
+  static char buffer[NET_ADDRSTRLEN+2];
   FAR char *ptr = (FAR char*)&in;
   sprintf(buffer, "%d.%d.%d.%d", ptr[0], ptr[1], ptr[2], ptr[3]);
   return buffer;
 }
 #endif
+#endif /* !CONFIG_NET_IPv6 */
 

lib/net/lib_inetntop.c

@@ -0,0 +1,194 @@
+/****************************************************************************
+ * lib/net/lib_inetntop.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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. Neither the name NuttX 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 COPYRIGHT HOLDERS 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
+ * COPYRIGHT OWNER 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/socket.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include <arpa/inet.h>
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: inet_ntop
+ *
+ * Description:
+ *  The inet_ntop() function converts a numeric address into a text string
+ *  suitable for presentation.
+ *
+ * Input Parameters:
+ *   af   - The af argument specifies the family of the address. This can be
+ *          AF_INET or AF_INET6.
+ *   src  - The src argument points to a buffer holding an address of the
+ *          specified type.  The address must be in network byte order.
+ *   dst  - The dst argument points to a buffer where the function stores
+ *          the resulting text string; it shall not be NULL.
+ *   size - The size argument specifies the size of this buffer, which must
+ *          be large enough to hold the text string (INET_ADDRSTRLEN
+ *          characters for IPv4, INET6_ADDRSTRLEN characters for IPv6).
+ *
+ * Returned Value:
+ *   inet_ntop() returns a pointer to the buffer containing the text string
+ *   if the conversion succeeds.  Otherwise, NULL is returned and the errno
+ *   is set to indicate the error.  There follow errno values may be set:
+ *
+ *   EAFNOSUPPORT - The af argument is invalid.
+ *   ENOSPC - The size of the inet_ntop() result buffer is inadequate
+ *
+ ****************************************************************************/
+
+FAR const char *inet_ntop(int af, FAR const void *src, FAR char *dst, socklen_t size)
+{
+  int errval;
+#ifndef CONFIG_NET_IPv6
+  FAR char *ptr;
+
+  DEBUGASSERT(src && dst);
+
+  if (af != AF_INET)
+    {
+      errval = EAFNOSUPPORT;
+      goto errout;
+    }
+
+  if (size < INET_ADDRSTRLEN)
+    {
+      errval = ENOSPC;
+      goto errout;
+    }
+
+  ptr = (FAR char*)src;
+  sprintf(dst, "%d.%d.%d.%d", ptr[0], ptr[1], ptr[2], ptr[3]);
+  return dst;
+#else
+  FAR const in6_addr *in6_addr;
+  uint16_t warray[8];
+  int offset;
+  int entry;
+  int count;
+  int maxentry;
+  int maxcount;
+ 
+  if (af != AF_INET6)
+    {
+      errval = EAFNOSUPPORT;
+      goto errout;
+    }
+
+  if (size < INET6_ADDRSTRLEN)
+    {
+      errval = ENOSPC;
+      goto errout;
+    }
+
+  in6_addr = (FAR const in6_addr *)src;
+  entry    = -1;
+  maxentry = -1;
+  maxcount = 0;
+  offset   = 0;
+
+  while (offset < 8)
+    {
+      warray[offset] = ntohs(in6_addr->s6_addr16[offset]);
+      if (warray[offset] == 0)
+        {
+          entry = offset;
+          count = 1;
+          offset++;
+
+          while (offset < 8)
+            {
+              warray[offset] = ntohs(in6_addr->s6_addr16[offset]);
+              if (warray[offset] != 0)
+                {
+                  break;
+                }
+              offset++;
+              count++;
+            }
+
+          if (count > maxcount)
+            {
+              maxentry = entry;
+              maxcount = count;
+            }
+        }
+      offset++;
+    }
+
+  offset = 0;
+  dst[0] = '\0';
+
+  while (offset < 8)
+    {
+      if (offset == maxentry)
+        {
+          size -= (socklen_t)snprintf((char *)(&dst[strlen(dst)]), (size_t)size, ":");
+          offset += maxcount;
+          if (offset >= 8)
+            {
+              size -= (socklen_t)snprintf((char *)(&dst[strlen(dst)]), (size_t)size, ":");
+            }
+        }
+      else
+        {
+          if (offset > 0)
+            {
+              size -= (socklen_t)snprintf((char *)(&dst[strlen(dst)]), (size_t)size, ":");
+            }
+          size -= (socklen_t)snprintf((char *)(&dst[strlen(dst)]), (size_t)size, "%x", (unsigned int)warray[offset]);
+          offset++;
+        }
+    }
+
+    return dst;
+#endif
+
+errout:
+    set_errno(errval);
+    memset(dst, 0, size);
+    return NULL;
+}
+