source: rtems/cpukit/libnetworking/libc/inet_neta.c @ 9d647dfc

/*
 * Copyright (c) 1996 by 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static const char orig_rcsid[] = "From Id: inet_neta.c,v 8.2 1996/08/08 06:54:44 vixie Exp";
static const char rcsid[] = "$Id$";
#endif

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <errno.h>
#include <stdio.h>
#include <string.h>

#ifdef SPRINTF_CHAR
# define SPRINTF(x) strlen(sprintf/**/x)
#else
# define SPRINTF(x) ((size_t)sprintf x)
#endif

/*
 * char *
 * inet_neta(src, dst, size)
 *      format a u_long network number into presentation format.
 * return:
 *      pointer to dst, or NULL if an error occurred (check errno).
 * note:
 *      format of ``src'' is as for inet_network().
 * author:
 *      Paul Vixie (ISC), July 1996
 */
char *
inet_neta(src, dst, size)
        u_long src;
        char *dst;
        size_t size;
{
        char *odst = dst;
        char *tp;

        while (src & 0xffffffff) {
                u_char b = (src & 0xff000000) >> 24;

                src <<= 8;
                if (b) {
                        if (size < sizeof "255.")
                                goto emsgsize;
                        tp = dst;
                        dst += SPRINTF((dst, "%u", b));
                        if (src != 0L) {
                                *dst++ = '.';
                                *dst = '\0';
                        }
                        size -= (size_t)(dst - tp);
                }
        }
        if (dst == odst) {
                if (size < sizeof "0.0.0.0")
                        goto emsgsize;
                strcpy(dst, "0.0.0.0");
        }
        return (odst);

 emsgsize:
        errno = EMSGSIZE;
        return (NULL);
}