/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */

#include "mt.h"
#include "uucp.h"

#ifdef TLI

#include <stdio.h>
#include <string.h>
#include <memory.h>
#include <malloc.h>
#include <sys/tiuser.h>
#include <ctype.h>
#define OCT     0
#define HEX     1
/*
 * #include <nsaddr.h>
 */
#define toupper(c)      (islower(c) ? _toupper(c) : (c))
#define todigit(c)      ((int)((c) - '0'))      /* char to digit */
#define toxdigit(c)     ((isdigit(c))?todigit(c):(toupper(c)-(int)'A'+10))
#define isodigit(c)     (isdigit(c) && ((c) != '9') && ((c) != '8'))
#define itoac(i)        (((i) > 9) ? ((char)((i)-10) + 'A'):((char)(i) + '0'))
#define MASK(n)         ((1 << (n)) - 1)

#define SBUFSIZE        128

/*
 * #define      TRUE    1
 * #define      FALSE   0
 */

/*      local static functions  */
static int dobase(char *, char *, int);
static void memcp(char *, char *, int);
static char *xfer(char *, char *, unsigned, unsigned);

/*
 *      stoa - convert string to address
 *
 *      If a string begins in \o or \O, the following address is octal
 *      "  "   "       "    " \x or \X, the following address is hex
 *
 *      If ok, return pointer to netbuf structure.
 *      A  NULL is returned on any error(s).
 */

/* Return netbuf ptr if success */
static struct netbuf *
stoa(char *str, struct netbuf *addr)
{
        int     myadr;          /* was netbuf struct allocated here ? */
        static  char *sbuf;

        myadr = FALSE;

        if (!str)
                return (NULL);
        while (*str && isspace(*str))   /* leading whites are OK */
                ++str;

        if (!str || !*str)      /* Nothing to convert */
                return (NULL);

        if (!addr) {
                if ((addr = malloc(sizeof (struct netbuf))) == NULL)
                        return (NULL);

                myadr = TRUE;
                addr->buf = NULL;
                addr->maxlen = 0;
                addr->len = 0;
        }

        if (sbuf == NULL) {
                sbuf = malloc(SBUFSIZE);
                if (sbuf == NULL)
                        return (NULL);
        }

        /* Now process the address */
        if (*str == '\\') {
                ++str;
                switch (*str) {

                case 'X':       /* hex */
                case 'x':
                        addr->len = dobase(++str, sbuf, HEX);
                        break;

                case 'o':       /* octal */
                case 'O':
                        addr->len = dobase(++str, sbuf, OCT);
                        break;

                default:        /* error */
                        addr->len = 0;
                        break;
                }
        }

        if (addr->len == 0) {   /* Error in conversion */
                if (myadr)
                        free(addr);
                return (NULL);
        }
        if ((addr->buf = xfer(addr->buf, sbuf, addr->len, addr->maxlen)) ==
                                                                        NULL)
                return (NULL);
        return (addr);
}

/*
 *      dobase :        converts a hex or octal ASCII string
 *              to a binary address. Only HEX or OCT may be used
 *              for type.
 *      return length of binary string (in bytes), 0 if error.
 *      The binary result is placed at buf.
 */

static int
dobase(char *s, char *buf, int type)
{
        int     bp = SBUFSIZE - 1;
        int     shift = 0;
        char    *end;

        for (end = s; *end && ((type == OCT) ? isodigit(*end) :
                                                        isxdigit(*end)); ++end)
                ;

        /*
         * any non-white, non-digits cause address to be rejected,
         * other fields are ignored
         */
        if ((*s == 0) || (end == s) || (!isspace(*end) && *end)) {
                (void) fprintf(stderr,
                                "dobase: Illegal trailer on address string\n");
                buf[0] = '\0';
                return (0);
        }
        --end;

        buf[bp] = '\0';

        while (bp > 0 && end >= s) {
                buf[bp] |= toxdigit(*end) << shift;
                if (type == OCT) {
                        if (shift > 5) {
                                buf[--bp] = (todigit(*end) >> (8 - shift))
                                        & MASK(shift-5);
                        }
                        if ((shift = (shift + 3) % 8) == 0)
                                buf[--bp] = 0;
                } else  /* hex */
                        if ((shift = (shift) ? 0 : 4) == 0)
                                buf[--bp] = 0;
                --end;
        }
        if (bp == 0) {
                (void) fprintf(stderr, "stoa: dobase: number to long\n");
                return (0);
        }

        /* need to catch end case to avoid extra 0's in front   */
        if (!shift)
                bp++;
        memcp(buf, &buf[bp], (SBUFSIZE - bp));
        return (SBUFSIZE - bp);
}

static void
memcp(char *d, char *s, int n)
{
        while (n--)
                *d++ = *s++;
}

/*
 * transfer block to a given destination or allocate one of the
 *      right size
 *      if max = 0 : ignore max
 */

static char *
xfer(char *dest, char *src, unsigned len, unsigned max)
{
        if (max && dest && max < len) {         /* No room */
                (void) fprintf(stderr, "xfer: destination not long enough\n");
                return (NULL);
        }
        if (!dest)
                if ((dest = malloc(len)) == NULL) {
                        (void) fprintf(stderr, "xfer: malloc failed\n");
                        return (NULL);
                }

        (void) memcpy(dest, src, (size_t)len);
        return (dest);
}
#endif /* TLI */