/*      $NetBSD: nsap_addr.c,v 1.1.1.2 2012/09/09 16:07:50 christos Exp $       */

/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1996-1999 by Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "Id: nsap_addr.c,v 1.5 2005/07/28 06:51:48 marka Exp ";
#endif /* LIBC_SCCS and not lint */

#include "port_before.h"

#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>

#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>

#include <ctype.h>
#include <resolv.h>
#include <resolv_mt.h>

#include "port_after.h"

static char
xtob(int c) {
       return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
}

u_int
inet_nsap_addr(const char *ascii, u_char *binary, int maxlen) {
       u_char c, nib;
       u_int len = 0;

       if (ascii[0] != '0' || (ascii[1] != 'x' && ascii[1] != 'X'))
               return (0);
       ascii += 2;

       while ((c = *ascii++) != '\0' && len < (u_int)maxlen) {
               if (c == '.' || c == '+' || c == '/')
                       continue;
               if (!isascii(c))
                       return (0);
               if (islower(c))
                       c = toupper(c);
               if (isxdigit(c)) {
                       nib = xtob(c);
                       c = *ascii++;
                       if (c != '\0') {
                               c = toupper(c);
                               if (isxdigit(c)) {
                                       *binary++ = (nib << 4) | xtob(c);
                                       len++;
                               } else
                                       return (0);
                       }
                       else
                               return (0);
               }
               else
                       return (0);
       }
       return (len);
}

char *
inet_nsap_ntoa(int binlen, const u_char *binary, char *ascii) {
       int nib;
       int i;
       char *tmpbuf = inet_nsap_ntoa_tmpbuf;
       char *start;

       if (ascii)
               start = ascii;
       else {
               ascii = tmpbuf;
               start = tmpbuf;
       }

       *ascii++ = '0';
       *ascii++ = 'x';

       if (binlen > 255)
               binlen = 255;

       for (i = 0; i < binlen; i++) {
               nib = *binary >> 4;
               *ascii++ = nib + (nib < 10 ? '0' : '7');
               nib = *binary++ & 0x0f;
               *ascii++ = nib + (nib < 10 ? '0' : '7');
               if (((i % 2) == 0 && (i + 1) < binlen))
                       *ascii++ = '.';
       }
       *ascii = '\0';
       return (start);
}

/*! \file */