contrib/bind-9.2.4rc7/lib/bind/inet/inet_neta.c

   1 /*
   2  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (c) 1996,1999 by Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  15  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #if defined(LIBC_SCCS) && !defined(lint)
  19 static const char rcsid[] = "$Id: inet_neta.c,v 1.1.2.1 2004/03/09 09:17:27 marka Exp $";
  20 #endif
  21
  22 #include "port_before.h"
  23
  24 #include <sys/types.h>
  25 #include <sys/socket.h>
  26 #include <netinet/in.h>
  27 #include <arpa/inet.h>
  28
  29 #include <errno.h>
  30 #include <stdio.h>
  31 #include <string.h>
  32
  33 #include "port_after.h"
  34
  35 #ifdef SPRINTF_CHAR
  36 # define SPRINTF(x) strlen(sprintf/**/x)
  37 #else
  38 # define SPRINTF(x) ((size_t)sprintf x)
  39 #endif
  40
  41 /*
  42  * char *
  43  * inet_neta(src, dst, size)
  44  *      format a u_long network number into presentation format.
  45  * return:
  46  *      pointer to dst, or NULL if an error occurred (check errno).
  47  * note:
  48  *      format of ``src'' is as for inet_network().
  49  * author:
  50  *      Paul Vixie (ISC), July 1996
  51  */
  52 char *
  53 inet_neta(src, dst, size)
  54         u_long src;
  55         char *dst;
  56         size_t size;
  57 {
  58         char *odst = dst;
  59         char *tp;
  60
  61         while (src & 0xffffffff) {
  62                 u_char b = (src & 0xff000000) >> 24;
  63
  64                 src <<= 8;
  65                 if (b) {
  66                         if (size < sizeof "255.")
  67                                 goto emsgsize;
  68                         tp = dst;
  69                         dst += SPRINTF((dst, "%u", b));
  70                         if (src != 0L) {
  71                                 *dst++ = '.';
  72                                 *dst = '\0';
  73                         }
  74                         size -= (size_t)(dst - tp);
  75                 }
  76         }
  77         if (dst == odst) {
  78                 if (size < sizeof "0.0.0.0")
  79                         goto emsgsize;
  80                 strcpy(dst, "0.0.0.0");
  81         }
  82         return (odst);
  83
  84  emsgsize:
  85         errno = EMSGSIZE;
  86         return (NULL);
  87 }