cmd/bnu/stoa.c

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


#ident  "%Z%%M% %I% %E% SMI"    /* from SVR4 bnu:stoa.c 1.4 */

#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;
 */

GLOBAL char sbuf[SBUFSIZE];

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

/*
    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).
*/

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

    myadr = FALSE;

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

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

    if (!addr) {
        if ((addr = (struct netbuf *)malloc(sizeof(struct netbuf))) == NULL)
            return NULL;
        myadr = TRUE;
        addr->buf = NULL;
        addr->maxlen = 0;
        addr->len = 0;
    }

    /* 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;
    else
        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(s, buf, type)    /* read in an address */
char    *s, *buf;   /* source ASCII, result binary string */
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)) {
        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) {
        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(d, s, n)  /* safe memcpy for overlapping regions */
char    *d, *s;
int n;
{
    while (n--)
        *d++ = *s++;
    return;
}

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

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

    memcpy(dest, src, (int)len);
    return dest;
}

#endif /* TLI */