external/bsd/libbind/dist/inet/nsap_addr.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (c) 1996-1999 by Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  17  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 #if defined(LIBC_SCCS) && !defined(lint)
  21 static const char rcsid[] = "Id: nsap_addr.c,v 1.5 2005/07/28 06:51:48 marka Exp";
  22 #endif /* LIBC_SCCS and not lint */
  23
  24 #include "port_before.h"
  25
  26 #include <sys/types.h>
  27 #include <sys/param.h>
  28 #include <sys/socket.h>
  29
  30 #include <netinet/in.h>
  31 #include <arpa/inet.h>
  32 #include <arpa/nameser.h>
  33
  34 #include <ctype.h>
  35 #include <resolv.h>
  36 #include <resolv_mt.h>
  37
  38 #include "port_after.h"
  39
  40 static char
  41 xtob(int c) {
  42         return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
  43 }
  44
  45 u_int
  46 inet_nsap_addr(const char *ascii, u_char *binary, int maxlen) {
  47         u_char c, nib;
  48         u_int len = 0;
  49
  50         if (ascii[0] != '0' || (ascii[1] != 'x' && ascii[1] != 'X'))
  51                 return (0);
  52         ascii += 2;
  53
  54         while ((c = *ascii++) != '\0' && len < (u_int)maxlen) {
  55                 if (c == '.' || c == '+' || c == '/')
  56                         continue;
  57                 if (!isascii(c))
  58                         return (0);
  59                 if (islower(c))
  60                         c = toupper(c);
  61                 if (isxdigit(c)) {
  62                         nib = xtob(c);
  63                         c = *ascii++;
  64                         if (c != '\0') {
  65                                 c = toupper(c);
  66                                 if (isxdigit(c)) {
  67                                         *binary++ = (nib << 4) | xtob(c);
  68                                         len++;
  69                                 } else
  70                                         return (0);
  71                         }
  72                         else
  73                                 return (0);
  74                 }
  75                 else
  76                         return (0);
  77         }
  78         return (len);
  79 }
  80
  81 char *
  82 inet_nsap_ntoa(int binlen, const u_char *binary, char *ascii) {
  83         int nib;
  84         int i;
  85         char *tmpbuf = inet_nsap_ntoa_tmpbuf;
  86         char *start;
  87
  88         if (ascii)
  89                 start = ascii;
  90         else {
  91                 ascii = tmpbuf;
  92                 start = tmpbuf;
  93         }
  94
  95         *ascii++ = '0';
  96         *ascii++ = 'x';
  97
  98         if (binlen > 255)
  99                 binlen = 255;
 100
 101         for (i = 0; i < binlen; i++) {
 102                 nib = *binary >> 4;
 103                 *ascii++ = nib + (nib < 10 ? '0' : '7');
 104                 nib = *binary++ & 0x0f;
 105                 *ascii++ = nib + (nib < 10 ? '0' : '7');
 106                 if (((i % 2) == 0 && (i + 1) < binlen))
 107                         *ascii++ = '.';
 108         }
 109         *ascii = '\0';
 110         return (start);
 111 }
 112
 113 /*! \file */