lib/roken/copyhostent.c

   1 /*
   2  * Copyright (c) 1999 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <config.h>
  35
  36 #include "roken.h"
  37
  38 /*
  39  * return a malloced copy of `h'
  40  */
  41
  42 ROKEN_LIB_FUNCTION struct hostent * ROKEN_LIB_CALL
  43 copyhostent (const struct hostent *h)
  44 {
  45     struct hostent *res;
  46     char **p;
  47     int i, n;
  48
  49     res = malloc (sizeof (*res));
  50     if (res == NULL)
  51         return NULL;
  52     res->h_name      = NULL;
  53     res->h_aliases   = NULL;
  54     res->h_addrtype  = h->h_addrtype;
  55     res->h_length    = h->h_length;
  56     res->h_addr_list = NULL;
  57     res->h_name = strdup (h->h_name);
  58     if (res->h_name == NULL) {
  59         freehostent (res);
  60         return NULL;
  61     }
  62     for (n = 0, p = h->h_aliases; *p != NULL; ++p)
  63         ++n;
  64     res->h_aliases = malloc ((n + 1) * sizeof(*res->h_aliases));
  65     if (res->h_aliases == NULL) {
  66         freehostent (res);
  67         return NULL;
  68     }
  69     for (i = 0; i < n + 1; ++i)
  70         res->h_aliases[i] = NULL;
  71     for (i = 0; i < n; ++i) {
  72         res->h_aliases[i] = strdup (h->h_aliases[i]);
  73         if (res->h_aliases[i] == NULL) {
  74             freehostent (res);
  75             return NULL;
  76         }
  77     }
  78
  79     for (n = 0, p = h->h_addr_list; *p != NULL; ++p)
  80         ++n;
  81     res->h_addr_list = malloc ((n + 1) * sizeof(*res->h_addr_list));
  82     if (res->h_addr_list == NULL) {
  83         freehostent (res);
  84         return NULL;
  85     }
  86     for (i = 0; i < n + 1; ++i) {
  87         res->h_addr_list[i] = NULL;
  88     }
  89     for (i = 0; i < n; ++i) {
  90         res->h_addr_list[i] = malloc (h->h_length);
  91         if (res->h_addr_list[i] == NULL) {
  92             freehostent (res);
  93             return NULL;
  94         }
  95         memcpy (res->h_addr_list[i], h->h_addr_list[i], h->h_length);
  96     }
  97     return res;
  98 }
  99