common/inet/nsap_addr.c

/*
 * 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 */