Ziele Untersuchung
mit Columbo Integrität von
Datenbanken Interaktion und
Portierbarkeit Ergonomie der
Schnittstellen

Angebot Produkte Projekt Beratung

Mittel Analytik Modellierung Sprachen Algebra Logik Hardware Denken Kreativität

Zusammenhänge Gesellschaft Wirtschaft Branche Firma


products/sources/formale Sprachen/C/iPerf/compat/ Datei vom 30.0.2026 mit Größe 5 kB

Quelle inet_ntop.c Sprache: C

#include "inet_aton.h"
#ifdef __cplusplus
extern "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.
*/
int
inet_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.
*/
int
inet_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_IPV6
int
inet_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

quality91%

¤ Dauer der Verarbeitung: 0.1 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.