+/* inet_ntop.c -- convert IPv4 and IPv6 addresses from binary to text form
+
+ Copyright (C) 2005-2006, 2008-2014 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, see <http://www.gnu.org/licenses/>. */
+
/*
* Copyright (c) 1996-1999 by Internet Software Consortium.
- * Copyright (c) 2005 Free Software Foundation, Inc.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* SOFTWARE.
*/
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
/* Specification. */
-#include "inet_ntop.h"
+#include <arpa/inet.h>
+
+/* Use this to suppress gcc's "...may be used before initialized" warnings.
+ Beware: The Code argument must not contain commas. */
+#ifndef IF_LINT
+# ifdef lint
+# define IF_LINT(Code) Code
+# else
+# define IF_LINT(Code) /* empty */
+# endif
+#endif
+
+#if HAVE_DECL_INET_NTOP
+
+# undef inet_ntop
+
+const char *
+rpl_inet_ntop (int af, const void *restrict src,
+ char *restrict dst, socklen_t cnt)
+{
+ return inet_ntop (af, src, dst, cnt);
+}
+
+#else
-#include <stdio.h>
-#include <string.h>
-#include <errno.h>
+# include <stdio.h>
+# include <string.h>
+# include <errno.h>
-#define NS_IN6ADDRSZ 16
-#define NS_INT16SZ 2
+# define NS_IN6ADDRSZ 16
+# define NS_INT16SZ 2
/*
* 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.
*/
-typedef int verify_int_size[2 * sizeof(int) - 7];
+typedef int verify_int_size[4 <= sizeof (int) ? 1 : -1];
-#if HAVE_IPV4
static const char *inet_ntop4 (const unsigned char *src, char *dst, socklen_t size);
-#endif
-#if HAVE_IPV6
+# if HAVE_IPV6
static const char *inet_ntop6 (const unsigned char *src, char *dst, socklen_t size);
-#endif
+# endif
/* char *
* inet_ntop(af, src, dst, size)
- * convert a network format address to presentation format.
+ * convert a network format address to presentation format.
* return:
- * pointer to presentation format address (`dst'), or NULL (see errno).
+ * pointer to presentation format address ('dst'), or NULL (see errno).
* author:
- * Paul Vixie, 1996.
+ * Paul Vixie, 1996.
*/
const char *
-inet_ntop(af, src, dst, size)
- int af;
- const void *src;
- char *dst;
- socklen_t size;
+inet_ntop (int af, const void *restrict src,
+ char *restrict dst, socklen_t cnt)
{
- switch (af) {
+ switch (af)
+ {
+# if HAVE_IPV4
+ case AF_INET:
+ return (inet_ntop4 (src, dst, cnt));
+# endif
-#if HAVE_IPV4
- case AF_INET:
- return (inet_ntop4(src, dst, size));
-#endif
+# if HAVE_IPV6
+ case AF_INET6:
+ return (inet_ntop6 (src, dst, cnt));
+# endif
-#if HAVE_IPV6
- case AF_INET6:
- return (inet_ntop6(src, dst, size));
-#endif
- default:
- errno = EAFNOSUPPORT;
- return (NULL);
- }
- /* NOTREACHED */
+ default:
+ errno = EAFNOSUPPORT;
+ return (NULL);
+ }
+ /* NOTREACHED */
}
-#if HAVE_IPV4
-
/* const char *
* inet_ntop4(src, dst, size)
- * format an IPv4 address
+ * format an IPv4 address
* return:
- * `dst' (as a const)
+ * 'dst' (as a const)
* notes:
- * (1) uses no statics
- * (2) takes a u_char* not an in_addr as input
+ * (1) uses no statics
+ * (2) takes a u_char* not an in_addr as input
* author:
- * Paul Vixie, 1996.
+ * Paul Vixie, 1996.
*/
static const char *
-inet_ntop4(src, dst, size)
- const unsigned char *src;
- char *dst;
- socklen_t size;
+inet_ntop4 (const unsigned 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);
- }
- return strcpy(dst, tmp);
-}
+ char tmp[sizeof "255.255.255.255"];
+ int len;
-#endif
+ len = sprintf (tmp, "%u.%u.%u.%u", src[0], src[1], src[2], src[3]);
+ if (len < 0)
+ return NULL;
-#if HAVE_IPV6
+ if (len > size)
+ {
+ errno = ENOSPC;
+ return NULL;
+ }
+
+ return strcpy (dst, tmp);
+}
+
+# if HAVE_IPV6
/* const char *
* inet_ntop6(src, dst, size)
- * convert IPv6 binary address into presentation (printable) format
+ * convert IPv6 binary address into presentation (printable) format
* author:
- * Paul Vixie, 1996.
+ * Paul Vixie, 1996.
*/
static const char *
-inet_ntop6(src, dst, size)
- const unsigned char *src;
- char *dst;
- socklen_t size;
+inet_ntop6 (const unsigned 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;
- unsigned 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 += 2)
- words[i / 2] = (src[i] << 8) | src[i + 1];
- 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);
- }
- return strcpy(dst, tmp);
+ /*
+ * 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;
+ unsigned 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 += 2)
+ words[i / 2] = (src[i] << 8) | src[i + 1];
+ best.base = -1;
+ cur.base = -1;
+ IF_LINT(best.len = 0);
+ IF_LINT(cur.len = 0);
+ 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;
+ }
+ {
+ int len = sprintf (tp, "%x", words[i]);
+ if (len < 0)
+ return NULL;
+ tp += len;
+ }
+ }
+ /* 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;
+ }
+
+ return strcpy (dst, tmp);
}
+# endif
+
#endif
projects / gnulib.git / blobdiff