🌈style: 调整目录组织，tcpdump源代码放入src目录

src/addrtostr.c

@@ -0,0 +1,199 @@
+/*
+ * Copyright (c) 1999 Kungliga Tekniska Högskolan
+ * (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
+ *      Högskolan 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"
+#endif
+
+#include <netdissect-stdinc.h>
+#include "addrtostr.h"
+
+#include <stdio.h>
+#include <string.h>
+
+/*
+ *
+ */
+
+#ifndef IN6ADDRSZ
+#define IN6ADDRSZ   16   /* IPv6 T_AAAA */
+#endif
+
+#ifndef INT16SZ
+#define INT16SZ     2    /* word size */
+#endif
+
+const char *
+addrtostr (const void *src, char *dst, size_t size)
+{
+    const u_char *srcaddr = (const u_char *)src;
+    const char digits[] = "0123456789";
+    int i;
+    const char *orig_dst = dst;
+
+    if (size < INET_ADDRSTRLEN) {
+	errno = ENOSPC;
+	return NULL;
+    }
+    for (i = 0; i < 4; ++i) {
+    	int n = *srcaddr++;
+	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;
+}
+
+/*
+ * Convert IPv6 binary address into presentation (printable) format.
+ */
+const char *
+addrtostr6 (const void *src, char *dst, size_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.
+   */
+  const u_char *srcaddr = (const u_char *)src;
+  char  tmp [INET6_ADDRSTRLEN+1];
+  char *tp;
+  struct {
+    long base;
+    long len;
+  } best, cur;
+  u_long words [IN6ADDRSZ / INT16SZ];
+  u_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 < IN6ADDRSZ; i++)
+      words[i/2] |= (srcaddr[i] << ((1 - (i % 2)) << 3));
+
+  best.len = 0;
+  best.base = -1;
+  cur.len = 0;
+  cur.base  = -1;
+  for (i = 0; i < (IN6ADDRSZ / 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) && (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 < (IN6ADDRSZ / 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 (!addrtostr(srcaddr+12, tp, sizeof(tmp) - (tp - tmp)))
+      {
+        errno = ENOSPC;
+        return (NULL);
+      }
+      tp += strlen(tp);
+      break;
+    }
+    tp += sprintf (tp, "%lx", words[i]);
+  }
+
+  /* Was it a trailing run of 0x00's?
+   */
+  if (best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ))
+     *tp++ = ':';
+  *tp++ = '\0';
+
+  /* Check for overflow, copy, and we're done.
+   */
+  if ((size_t)(tp - tmp) > size)
+  {
+    errno = ENOSPC;
+    return (NULL);
+  }
+  return strcpy (dst, tmp);
+}