StdLib/BsdSocketLib/nsap_addr.c

   1 /*
   2  * Copyright (c) 1996, 1998 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 #include <sys/types.h>
  19 #include <sys/param.h>
  20 #include <sys/socket.h>
  21 #include <netinet/in.h>
  22 #include <arpa/inet.h>
  23 #include <arpa/nameser.h>
  24 #include <ctype.h>
  25 #include <resolv.h>
  26
  27 static char
  28 xtob(
  29         register int c
  30         )
  31 {
  32         return (char)(c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
  33 }
  34
  35 u_int
  36 inet_nsap_addr(
  37         const char *ascii,
  38         u_char *binary,
  39         int maxlen
  40         )
  41 {
  42         u_char c, nib;
  43         u_int len = 0;
  44
  45         while ((c = *ascii++) != '\0' && len < (u_int)maxlen) {
  46                 if (c == '.' || c == '+' || c == '/')
  47                         continue;
  48                 if (!isascii(c))
  49                         return (0);
  50                 if (islower(c))
  51                         c = (u_char)( toupper(c));
  52                 if (isxdigit(c)) {
  53                         nib = xtob(c);
  54                         c = *ascii++;
  55                         if (c != '\0') {
  56                                 c = (u_char)( toupper(c));
  57                                 if (isxdigit(c)) {
  58                                         *binary++ = (nib << 4) | xtob(c);
  59                                         len++;
  60                                 } else
  61                                         return (0);
  62                         }
  63                         else
  64                                 return (0);
  65                 }
  66                 else
  67                         return (0);
  68         }
  69         return (len);
  70 }
  71
  72 char *
  73 inet_nsap_ntoa(
  74         int binlen,
  75         register const u_char *binary,
  76         register char *ascii
  77         )
  78 {
  79         register int nib;
  80         int i;
  81         static char tmpbuf[255*3];
  82         char *start;
  83
  84         if (ascii)
  85                 start = ascii;
  86         else {
  87                 ascii = tmpbuf;
  88                 start = tmpbuf;
  89         }
  90
  91         if (binlen > 255)
  92                 binlen = 255;
  93
  94         for (i = 0; i < binlen; i++) {
  95                 nib = *binary >> 4;
  96                 *ascii++ = (char)( nib + (nib < 10 ? '0' : '7'));
  97                 nib = *binary++ & 0x0f;
  98                 *ascii++ = (char)( nib + (nib < 10 ? '0' : '7'));
  99                 if (((i % 2) == 0 && (i + 1) < binlen))
 100                         *ascii++ = '.';
 101         }
 102         *ascii = '\0';
 103         return (start);
 104 }