1: /*
    2:  * Copyright (c) 1996,1999 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 rcsid[] = "$BINDId: inet_neta.c,v 1.6 1999/01/08 19:23:45 vixie Exp $";
   20: #endif
   21: 
   22: #include <sys/types.h>
   23: #include <sys/socket.h>
   24: #include <netinet/in.h>
   25: #include <arpa/inet.h>
   26: 
   27: #include <errno.h>
   28: #include <stdio.h>
   29: #include <string.h>
   30: 
   31: #ifdef SPRINTF_CHAR
   32: # define SPRINTF(x) strlen(sprintf/**/x)
   33: #else
   34: # define SPRINTF(x) ((size_t)sprintf x)
   35: #endif
   36: 
   37: /*
   38:  * char *
   39:  * inet_neta(src, dst, size)
   40:  *      format a u_long network number into presentation format.
   41:  * return:
   42:  *      pointer to dst, or NULL if an error occurred (check errno).
   43:  * note:
   44:  *      format of ``src'' is as for inet_network().
   45:  * author:
   46:  *      Paul Vixie (ISC), July 1996
   47:  */
   48: char *
   49: inet_neta(src, dst, size)
   50:         u_int32_t src;
   51:         char *dst;
   52:         size_t size;
   53: {
   54:         char *odst = dst;
   55:         char *tp;
   56: 
   57:         while (src & 0xffffffff) {
   58:                 u_char b = (src & 0xff000000) >> 24;
   59: 
   60:                 src <<= 8;
   61:                 if (b) {
   62:                         if (size < sizeof "255.")
   63:                                 goto emsgsize;
   64:                         tp = dst;
   65:                         dst += SPRINTF((dst, "%u", b));
   66:                         if (src != 0L) {
   67:                                 *dst++ = '.';
   68:                                 *dst = '\0';
   69:                         }
   70:                         size -= (size_t)(dst - tp);
   71:                 }
   72:         }
   73:         if (dst == odst) {
   74:                 if (size < sizeof "0.0.0.0")
   75:                         goto emsgsize;
   76:                 strcpy(dst, "0.0.0.0");
   77:         }
   78:         return (odst);
   79: 
   80:  emsgsize:
   81:         __set_errno (EMSGSIZE);
   82:         return (NULL);
   83: }