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      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 /*
     19  * Portions copyright (c) 1999, 2000
     20  * Intel Corporation.
     21  * All rights reserved.
     22  *
     23  * Redistribution and use in source and binary forms, with or without
     24  * modification, are permitted provided that the following conditions
     25  * are met:
     26  *
     27  * 1. Redistributions of source code must retain the above copyright
     28  *    notice, this list of conditions and the following disclaimer.
     29  *
     30  * 2. Redistributions in binary form must reproduce the above copyright
     31  *    notice, this list of conditions and the following disclaimer in the
     32  *    documentation and/or other materials provided with the distribution.
     33  *
     34  * 3. All advertising materials mentioning features or use of this software
     35  *    must display the following acknowledgement:
     36  *
     37  *    This product includes software developed by Intel Corporation and
     38  *    its contributors.
     39  *
     40  * 4. Neither the name of Intel Corporation or its contributors may be
     41  *    used to endorse or promote products derived from this software
     42  *    without specific prior written permission.
     43  *
     44  * THIS SOFTWARE IS PROVIDED BY INTEL CORPORATION AND CONTRIBUTORS ``AS IS''
     45  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     47  * ARE DISCLAIMED.  IN NO EVENT SHALL INTEL CORPORATION OR CONTRIBUTORS BE
     48  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     49  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     50  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     51  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     52  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     53  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     54  * THE POSSIBILITY OF SUCH DAMAGE.
     55  *
     56  */
     57 
     58 #if defined(LIBC_SCCS) && !defined(lint)
     59 static const char orig_rcsid[] = "From Id: inet_neta.c,v 8.2 1996/08/08 06:54:44 vixie Exp";
     60 static const char rcsid[] = "$Id: inet_neta.c,v 1.1.1.1 2003/11/19 01:51:29 kyu3 Exp $";
     61 #endif
     62 
     63 #include <sys/types.h>
     64 #include <sys/socket.h>
     65 #include <netinet/in.h>
     66 #include <arpa/inet.h>
     67 
     68 #include <errno.h>
     69 #include <stdio.h>
     70 #include <string.h>
     71 
     72 #ifdef SPRINTF_CHAR
     73 # define SPRINTF(x) strlen(sprintf/**/x)
     74 #else
     75 # define SPRINTF(x) ((size_t)sprintf x)
     76 #endif
     77 
     78 /*
     79  * char *
     80  * inet_neta(src, dst, size)
     81  *	format a u_long network number into presentation format.
     82  * return:
     83  *	pointer to dst, or NULL if an error occurred (check errno).
     84  * note:
     85  *	format of ``src'' is as for inet_network().
     86  * author:
     87  *	Paul Vixie (ISC), July 1996
     88  */
     89 char *
     90 inet_neta(
     91 	u_long src,
     92 	char *dst,
     93 	size_t size
     94 	)
     95 {
     96 	char *odst = dst;
     97 	char *tp;
     98 
     99 	while (src & 0xffffffff) {
    100 		u_char b = (u_char)((src & 0xff000000) >> 24);
    101 
    102 		src <<= 8;
    103 		if (b) {
    104 			if (size < sizeof "255.")
    105 				goto emsgsize;
    106 			tp = dst;
    107 			dst += SPRINTF((dst, "%u", b));
    108 			if (src != 0L) {
    109 				*dst++ = '.';
    110 				*dst = '\0';
    111 			}
    112 			size -= (size_t)(dst - tp);
    113 		}
    114 	}
    115 	if (dst == odst) {
    116 		if (size < sizeof "0.0.0.0")
    117 			goto emsgsize;
    118 		strcpy(dst, "0.0.0.0");
    119 	}
    120 	return (odst);
    121 
    122  emsgsize:
    123 	errno = EMSGSIZE;
    124 	return (NULL);
    125 }
    126