resolv/nsap_addr.c

   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 #if defined(LIBC_SCCS) && !defined(lint)
  19 static char rcsid[] = "$Id$";
  20 #endif /* LIBC_SCCS and not lint */
  21
  22 #include <sys/types.h>
  23 #include <sys/param.h>
  24 #include <sys/socket.h>
  25 #include <netinet/in.h>
  26 #include <arpa/nameser.h>
  27 #include <ctype.h>
  28 #include <resolv.h>
  29
  30 #include "../conf/portability.h"
  31
  32 #if !defined(isxdigit)  /* XXX - could be a function */
  33 static int
  34 isxdigit(c)
  35         register int c;
  36 {
  37         return ((c >= '0') && (c <= '9')) || ((c >= 'A') && (c <= 'F'));
  38 }
  39 #endif
  40
  41 static char
  42 xtob(c)
  43         register int c;
  44 {
  45         return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
  46 }
  47
  48 u_int
  49 inet_nsap_addr(ascii, binary, maxlen)
  50         const char *ascii;
  51         u_char *binary;
  52         int maxlen;
  53 {
  54         register u_char c, nib;
  55         u_int len = 0;
  56
  57         while ((c = *ascii++) != '\0' && (int) len < maxlen) {
  58                 if (c == '.' || c == '+' || c == '/')
  59                         continue;
  60                 if (!isascii(c))
  61                         return (0);
  62                 if (islower(c))
  63                         c = toupper(c);
  64                 if (isxdigit(c)) {
  65                         nib = xtob(c);
  66                         if (c = *ascii++) {
  67                                 c = toupper(c);
  68                                 if (isxdigit(c)) {
  69                                         *binary++ = (nib << 4) | xtob(c);
  70                                         len++;
  71                                 } else
  72                                         return (0);
  73                         }
  74                         else
  75                                 return (0);
  76                 }
  77                 else
  78                         return (0);
  79         }
  80         return (len);
  81 }
  82
  83 char *
  84 inet_nsap_ntoa(binlen, binary, ascii)
  85         int binlen;
  86         register const u_char *binary;
  87         register char *ascii;
  88 {
  89         register int nib;
  90         int i;
  91         static char tmpbuf[255*3];
  92         char *start;
  93
  94         if (ascii)
  95                 start = ascii;
  96         else {
  97                 ascii = tmpbuf;
  98                 start = tmpbuf;
  99         }
 100
 101         if (binlen > 255)
 102                 binlen = 255;
 103
 104         for (i = 0; i < binlen; i++) {
 105                 nib = *binary >> 4;
 106                 *ascii++ = nib + (nib < 10 ? '0' : '7');
 107                 nib = *binary++ & 0x0f;
 108                 *ascii++ = nib + (nib < 10 ? '0' : '7');
 109                 if (((i % 2) == 0 && (i + 1) < binlen))
 110                         *ascii++ = '.';
 111         }
 112         *ascii = '\0';
 113         return (start);
 114 }