/*      $NetBSD: nsap_addr.c,v 1.6 2009/04/12 17:07:17 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.
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static const char rcsid[] = "Id: nsap_addr.c,v 1.5 2005/07/28 06:51:48 marka Exp";
#else
__RCSID("$NetBSD: nsap_addr.c,v 1.6 2009/04/12 17:07:17 christos Exp $");
#endif
#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 <assert.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;

        assert(ascii != NULL);
        assert(binary != NULL);

        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;

        assert(binary != NULL);

        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 = (u_int32_t)*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);
}

#undef inet_nsap_addr
#pragma weak inet_nsap_addr = __inet_nsap_addr
#undef inet_nsap_ntoa
#pragma weak inet_nsap_ntoa = __inet_nsap_ntoa