net/FreeBSD/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 1.2.18.1 2005/04/27 05:00:53 sra Exp $";
  20 #endif
  21 #include <sys/cdefs.h>
  22 __FBSDID("$FreeBSD: src/lib/libc/inet/inet_neta.c,v 1.3 2007/06/03 17:20:26 ume Exp $");
  23
  24 #include "port_before.h"
  25
  26 #include <sys/types.h>
  27 #include <sys/socket.h>
  28 #include <netinet/in.h>
  29 #include <arpa/inet.h>
  30
  31 #include <errno.h>
  32 #include <stdio.h>
  33 #include <string.h>
  34
  35 #include "port_after.h"
  36
  37 #ifdef SPRINTF_CHAR
  38 # define SPRINTF(x) strlen(sprintf/**/x)
  39 #else
  40 # define SPRINTF(x) ((size_t)sprintf x)
  41 #endif
  42
  43 /*%
  44  * char *
  45  * inet_neta(src, dst, size)
  46  *      format an in_addr_t network number into presentation format.
  47  * return:
  48  *      pointer to dst, or NULL if an error occurred (check errno).
  49  * note:
  50  *      format of ``src'' is as for inet_network().
  51  * author:
  52  *      Paul Vixie (ISC), July 1996
  53  */
  54 char *
  55 inet_neta(src, dst, size)
  56         in_addr_t src;
  57         char *dst;
  58         size_t size;
  59 {
  60         char *odst = dst;
  61         char *tp;
  62
  63         while (src & 0xffffffff) {
  64                 u_char b = (src & 0xff000000) >> 24;
  65
  66                 src <<= 8;
  67                 if (b) {
  68                         if (size < sizeof "255.")
  69                                 goto emsgsize;
  70                         tp = dst;
  71                         dst += SPRINTF((dst, "%u", b));
  72                         if (src != 0L) {
  73                                 *dst++ = '.';
  74                                 *dst = '\0';
  75                         }
  76                         size -= (size_t)(dst - tp);
  77                 }
  78         }
  79         if (dst == odst) {
  80                 if (size < sizeof "0.0.0.0")
  81                         goto emsgsize;
  82                 strcpy(dst, "0.0.0.0");
  83         }
  84         return (odst);
  85
  86  emsgsize:
  87         errno = EMSGSIZE;
  88         return (NULL);
  89 }
  90
  91 /*
  92  * Weak aliases for applications that use certain private entry points,
  93  * and fail to include <arpa/inet.h>.
  94  */
  95 #undef inet_neta
  96 __weak_reference(__inet_neta, inet_neta);
  97
  98 /*! \file */