source: rtems/cpukit/libnetworking/libc/nsap_addr.c @ 96b39164

/*
 * Copyright (c) 1996, 1998 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM 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 char rcsid[] = "$Id$";
#endif /* LIBC_SCCS and not lint */

#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>

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

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

        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(binlen, binary, ascii)
        int binlen;
        register const u_char *binary;
        register char *ascii;
{
        register int nib;
        int i;
        static char tmpbuf[255*3];
        char *start;

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

        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);
}