net/FreeBSD/inet_neta.c

   1 /*
   2  * Copyright (c) 1996 by Internet Software Consortium.
   3  *
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
   9  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
  10  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
  11  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  12  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  13  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  14  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  15  * SOFTWARE.
  16  */
  17
  18 #if defined(LIBC_SCCS) && !defined(lint)
  19 static const char orig_rcsid[] = "From Id: inet_neta.c,v 8.2 1996/08/08 06:54:44 vixie Exp";
  20 #endif
  21 #include <sys/cdefs.h>
  22 __FBSDID("$FreeBSD: src/lib/libc/net/inet_neta.c,v 1.9 2003/01/01 18:48:43 schweikh Exp $");
  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 #ifdef SPRINTF_CHAR
  34 # define SPRINTF(x) strlen(sprintf/**/x)
  35 #else
  36 # define SPRINTF(x) ((size_t)sprintf x)
  37 #endif
  38
  39 /*
  40  * char *
  41  * inet_neta(src, dst, size)
  42  *      format an in_addr_t network number into presentation format.
  43  * return:
  44  *      pointer to dst, or NULL if an error occurred (check errno).
  45  * note:
  46  *      format of ``src'' is as for inet_network().
  47  * author:
  48  *      Paul Vixie (ISC), July 1996
  49  */
  50 char *
  51 inet_neta(src, dst, size)
  52         in_addr_t src;
  53         char *dst;
  54         size_t size;
  55 {
  56         char *odst = dst;
  57         char *tp;
  58
  59         while (src & 0xffffffff) {
  60                 u_char b = (src & 0xff000000) >> 24;
  61
  62                 src <<= 8;
  63                 if (b) {
  64                         if (size < sizeof "255.")
  65                                 goto emsgsize;
  66                         tp = dst;
  67                         dst += SPRINTF((dst, "%u", b));
  68                         if (src != 0L) {
  69                                 *dst++ = '.';
  70                                 *dst = '\0';
  71                         }
  72                         size -= (size_t)(dst - tp);
  73                 }
  74         }
  75         if (dst == odst) {
  76                 if (size < sizeof "0.0.0.0")
  77                         goto emsgsize;
  78                 strcpy(dst, "0.0.0.0");
  79         }
  80         return (odst);
  81
  82  emsgsize:
  83         errno = EMSGSIZE;
  84         return (NULL);
  85 }
  86
  87 /*
  88  * Weak aliases for applications that use certain private entry points,
  89  * and fail to include <arpa/inet.h>.
  90  */
  91 #undef inet_neta
  92 __weak_reference(__inet_neta, inet_neta);