libnsl/dial/stoa.c

	stoa.c revision e8031f0a8ed0e45c6d8847c5e09424e66fd34a4b
/*
 * 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   */

#pragma ident   "%Z%%M% %I% %E% SMI"

#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 */