diff options
Diffstat (limited to 'lib/inet_ntop.c')
| -rw-r--r-- | lib/inet_ntop.c | 150 |
1 files changed, 86 insertions, 64 deletions
diff --git a/lib/inet_ntop.c b/lib/inet_ntop.c index 537b59f..823d345 100644 --- a/lib/inet_ntop.c +++ b/lib/inet_ntop.c @@ -1,10 +1,10 @@ /* inet_ntop.c -- convert IPv4 and IPv6 addresses from binary to text form - Copyright (C) 2005, 2006 Free Software Foundation, Inc. + Copyright (C) 2005-2006, 2008-2016 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) + the Free Software Foundation; either version 3, or (at your option) any later version. This program is distributed in the hope that it will be useful, @@ -13,8 +13,7 @@ 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, write to the Free Software Foundation, - Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + along with this program; if not, see <http://www.gnu.org/licenses/>. */ /* * Copyright (c) 1996-1999 by Internet Software Consortium. @@ -36,54 +35,73 @@ #include <config.h> /* Specification. */ -#include "inet_ntop.h" +#include <arpa/inet.h> -#include <stdio.h> -#include <string.h> -#include <errno.h> - -#ifndef EAFNOSUPPORT -# define EAFNOSUPPORT EINVAL +/* 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 -#define NS_IN6ADDRSZ 16 -#define NS_INT16SZ 2 +#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> + +# 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]; static const char *inet_ntop4 (const unsigned char *src, char *dst, socklen_t size); -#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 (int af, const void *restrict src, - char *restrict dst, socklen_t cnt) + char *restrict dst, socklen_t cnt) { switch (af) { -#if HAVE_IPV4 +# if HAVE_IPV4 case AF_INET: return (inet_ntop4 (src, dst, cnt)); -#endif +# endif -#if HAVE_IPV6 +# if HAVE_IPV6 case AF_INET6: return (inet_ntop6 (src, dst, cnt)); -#endif +# endif default: errno = EAFNOSUPPORT; @@ -94,14 +112,14 @@ inet_ntop (int af, const void *restrict src, /* 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 (const unsigned char *src, char *dst, socklen_t size) @@ -122,13 +140,13 @@ inet_ntop4 (const unsigned char *src, char *dst, socklen_t size) return strcpy (dst, tmp); } -#if HAVE_IPV6 +# 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 (const unsigned char *src, char *dst, socklen_t size) @@ -158,29 +176,31 @@ inet_ntop6 (const unsigned char *src, char *dst, socklen_t size) 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++; - } + { + 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; + cur.base = -1; + } + } } if (cur.base != -1) { if (best.base == -1 || cur.len > best.len) - best = cur; + best = cur; } if (best.base != -1 && best.len < 2) best.base = -1; @@ -193,28 +213,28 @@ inet_ntop6 (const unsigned char *src, char *dst, socklen_t size) { /* 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; - } + { + if (i == best.base) + *tp++ = ':'; + continue; + } /* Are we following an initial run of 0x00s or any real hex? */ if (i != 0) - *tp++ = ':'; + *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; - } + (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; + int len = sprintf (tp, "%x", words[i]); + if (len < 0) + return NULL; + tp += len; } } /* Was it a trailing run of 0x00's? */ @@ -235,4 +255,6 @@ inet_ntop6 (const unsigned char *src, char *dst, socklen_t size) return strcpy (dst, tmp); } +# endif + #endif |