net.subproj/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 1.3 2000/06/09 04:01:52 wsanchez 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
  33 #if !defined(isxdigit)  /* XXX - could be a function */
  34 static int
  35 isxdigit(c)
  36         register int c;
  37 {
  38         return ((c >= '0') && (c <= '9')) || ((c >= 'A') && (c <= 'F'));
  39 }
  40 #endif
  41
  42 static char
  43 xtob(c)
  44         register int c;
  45 {
  46         return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
  47 }
  48
  49 u_int
  50 inet_nsap_addr(ascii, binary, maxlen)
  51         const char *ascii;
  52         u_char *binary;
  53         int maxlen;
  54 {
  55         register u_char c, nib;
  56         u_int len = 0;
  57
  58         while ((c = *ascii++) != '\0' && len < maxlen) {
  59                 if (c == '.' || c == '+' || c == '/')
  60                         continue;
  61                 if (!isascii(c))
  62                         return (0);
  63                 if (islower(c))
  64                         c = toupper(c);
  65                 if (isxdigit(c)) {
  66                         nib = xtob(c);
  67                         if (c = *ascii++) {
  68                                 c = toupper(c);
  69                                 if (isxdigit(c)) {
  70                                         *binary++ = (nib << 4) | xtob(c);
  71                                         len++;
  72                                 } else
  73                                         return (0);
  74                         }
  75                         else
  76                                 return (0);
  77                 }
  78                 else
  79                         return (0);
  80         }
  81         return (len);
  82 }
  83
  84 char *
  85 inet_nsap_ntoa(binlen, binary, ascii)
  86         int binlen;
  87         register const u_char *binary;
  88         register char *ascii;
  89 {
  90         register int nib;
  91         int i;
  92         static char tmpbuf[255*3];
  93         char *start;
  94
  95         if (ascii)
  96                 start = ascii;
  97         else {
  98                 ascii = tmpbuf;
  99                 start = tmpbuf;
 100         }
 101
 102         if (binlen > 255)
 103                 binlen = 255;
 104
 105         for (i = 0; i < binlen; i++) {
 106                 nib = *binary >> 4;
 107                 *ascii++ = nib + (nib < 10 ? '0' : '7');
 108                 nib = *binary++ & 0x0f;
 109                 *ascii++ = nib + (nib < 10 ? '0' : '7');
 110                 if (((i % 2) == 0 && (i + 1) < binlen))
 111                         *ascii++ = '.';
 112         }
 113         *ascii = '\0';
 114         return (start);
 115 }