net/nsap_addr.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 #if defined(LIBC_SCCS) && !defined(lint)
  23 static char rcsid[] = "$Id: nsap_addr.c,v 1.4 2002/05/17 21:00:31 bbraun Exp $";
  24 #endif /* LIBC_SCCS and not lint */
  25
  26 #include <sys/param.h>
  27 #include <sys/socket.h>
  28 #include <netinet/in.h>
  29 #include <arpa/nameser.h>
  30 #include <ctype.h>
  31 #include <resolv.h>
  32 #include <stdlib.h>
  33
  34 #if !defined(isxdigit)  /* XXX - could be a function */
  35 static int
  36 isxdigit(c)
  37         register int c;
  38 {
  39         return ((c >= '0') && (c <= '9')) || ((c >= 'A') && (c <= 'F'));
  40 }
  41 #endif
  42
  43 static char
  44 xtob(c)
  45         register int c;
  46 {
  47         return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
  48 }
  49
  50 u_int
  51 inet_nsap_addr(ascii, binary, maxlen)
  52         const char *ascii;
  53         u_char *binary;
  54         int maxlen;
  55 {
  56         register u_char c, nib;
  57         u_int len = 0;
  58
  59         while ((c = *ascii++) != '\0' && len < maxlen) {
  60                 if (c == '.' || c == '+' || c == '/')
  61                         continue;
  62                 if (!isascii(c))
  63                         return (0);
  64                 if (islower(c))
  65                         c = toupper(c);
  66                 if (isxdigit(c)) {
  67                         nib = xtob(c);
  68                         if (c = *ascii++) {
  69                                 c = toupper(c);
  70                                 if (isxdigit(c)) {
  71                                         *binary++ = (nib << 4) | xtob(c);
  72                                         len++;
  73                                 } else
  74                                         return (0);
  75                         }
  76                         else
  77                                 return (0);
  78                 }
  79                 else
  80                         return (0);
  81         }
  82         return (len);
  83 }
  84
  85 char *
  86 inet_nsap_ntoa(binlen, binary, ascii)
  87         int binlen;
  88         register const u_char *binary;
  89         register char *ascii;
  90 {
  91         register int nib;
  92         int i;
  93         static char *tmpbuf = NULL;
  94         char *start;
  95
  96         if( tmpbuf == NULL ) {
  97                 tmpbuf = malloc(255*3);
  98                 if( tmpbuf == NULL )
  99                         return NULL;
 100         }
 101
 102         if (ascii)
 103                 start = ascii;
 104         else {
 105                 ascii = tmpbuf;
 106                 start = tmpbuf;
 107         }
 108
 109         if (binlen > 255)
 110                 binlen = 255;
 111
 112         for (i = 0; i < binlen; i++) {
 113                 nib = *binary >> 4;
 114                 *ascii++ = nib + (nib < 10 ? '0' : '7');
 115                 nib = *binary++ & 0x0f;
 116                 *ascii++ = nib + (nib < 10 ? '0' : '7');
 117                 if (((i % 2) == 0 && (i + 1) < binlen))
 118                         *ascii++ = '.';
 119         }
 120         *ascii = '\0';
 121         return (start);
 122 }