#include "inet_aton.h"#ifdef __cplusplusextern "C" {#endif/* * Copyright (C) 1996-2001  Internet Software Consortium. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.*/#ifndef HAVE_INET_NTOP#define NS_INT16SZ       2#define NS_INADDRSZ     4#define NS_IN6ADDRSZ    16/* * 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. *//* char * * isc_net_ntop(af, src, dst, size) *      convert a network format address to presentation format. * return: *      pointer to presentation format address (`dst'), or NULL (see errno). * author: *      Paul Vixie, 1996. */intinet_ntop(int af, const void *src, char *dst, size_t size) {    switch ( af ) {        case AF_INET:            return(inet_ntop4(src, dst, size));#ifdef HAVE_IPV6        case AF_INET6:            return(inet_ntop6(src, dst, size));#endif        default:            return 0;    }    /* NOTREACHED */}/* const char * * inet_ntop4(src, dst, size) *      format an IPv4 address * return: *      `dst' (as a const) * notes: *      (1) uses no statics *      (2) takes a unsigned char* not an in_addr as input * author: *      Paul Vixie, 1996. */intinet_ntop4(const unsigned char *src, char *dst, size_t size) {    static const char *fmt = "%u.%u.%u.%u";    char tmp[sizeof "255.255.255.255"];    if ( (size_t)sprintf(tmp, fmt, src[0], src[1], src[2], src[3]) >= size ) {        return 0;    }    strcpy(dst, tmp);    return 1;}/* const char * * isc_inet_ntop6(src, dst, size) *      convert IPv6 binary address into presentation (printable) format * author: *      Paul Vixie, 1996. */#ifdef HAVE_IPV6intinet_ntop6(const unsigned char *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.     */    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++ )        words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));    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 0;            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 ( (size_t)(tp - tmp) > size ) {        errno = ENOSPC;        return 0;    }    strcpy(dst, tmp);    return 1;}#endif /* HAVE_IPV6 */#endif /* HAVE_INET_NTOP */#ifdef __cplusplus} /* end extern "C" */#endif