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libsrc/session.cxx

Go to the documentation of this file.

/**********************************************************************
 * Copyright 2002 Jeff Rush <jrush@taupro.com>
 * Original Copyright 1979-2002 Udanax.com
 *
 * This file is part of the Udanax xanalogical storage system.
 *
 * Udanax is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Udanax is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Udanax; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 **********************************************************************/

/* Modification History:
 * $Log: session.cxx,v $
 * Revision 1.10  2004/09/11 13:59:21  jrush
 * Changed all fprintf's to stderr to use the Nana library L() macro.  Also
 * removed a 2-3 minor compiler warnings.
 *
 * Revision 1.9  2004/09/04 16:02:18  jrush
 * Added Doxygen headers before each and every function definition.
 *
 * Revision 1.8  2002/07/14 08:35:24  jrush
 * Replace gerror(), qerror() with assert()
 *
 * Revision 1.7  2002/05/28 04:22:29  jrush
 * Adjusted source files to comply with GPL licensing.
 *
 * Revision 1.6  2002/04/12 11:56:43  jrush
 * Reorganized include file layout, renamed xanadu.h to udanax.h and
 * typecontext/typecrumcontext to C++ class Context/CrumContext.
 *
 * Revision 1.5  2002/04/10 18:01:54  jrush
 * Renamed class typeisa to IStreamAddr.
 *
 * Revision 1.4  2002/04/09 21:45:46  jrush
 * Renamed class 'tumbler' to 'Tumbler', for consistency with Python sources,
 * and changed typeisa from typedef to a subclass, in preparation for cleaning
 * up the type/class tree.
 *
 * Revision 1.3  2002/04/06 20:42:50  jrush
 * Switch from sess->alloc() style to new(sess) Object parameterized allocator.
 *
 * Revision 1.2  2002/04/06 19:51:30  jrush
 * Renamed TRUE/FALSE constant use to the C++ standard of true/false.
 *
 * Revision 1.1  2002/04/06 17:01:48  jrush
 * Renamed file task.cxx to the more meaningful session.cxx
 *
 * Revision 1.3  2002/04/06 15:01:17  jrush
 * Changed INT to just 'int'.
 *
 * Revision 1.2  2002/02/14 09:27:43  jrush
 * Cleaned up source:
 *
 * 1. ran thru the indent tool to achieve a standard look,
 * 2. added structured comments at top for use with DOxygen reporting
 *    as well as CVS keywords,
 * 3. fixed compiler warnings re ambiguous assign/compares,
 *    needed casts and unused/uninitialized variables,
 * 4. fixed funcs that didn't specify a return type,
 * 5. centralized prototypes in protos.h, removing incomplete ones,
 * 6. cleaned up use of bool/BOOLEAN type to suit C++ type,
 * 7. fixed initializer nesting in tumbler constants,
 * 8. renamed vars that conflict with C++ keywords (new, this),
 * 9. fixed global/extern confusion re some global vars.
 *
 */

#include "udanax.h"

Session::Session()
{
    inp           = stdin;
    outp          = stdout;
    errp          = stderr;
    tempspacehead = NULL;
    tempspacetail = NULL;

    /* tumblerclear(&account); */
}

    bool
Session::getaccount(
    IStreamAddr *accountptr)
{
    tumblerclear((Tumbler *) accountptr);
    return true;

    /* prompt (sess, "account? "); */

    /* gettumbler (sess, accountptr) && validaccount(sess, accountptr); L("in get account \n");
     * return(true); */
}

    void *
operator new(
    size_t   nbytes,
    Session *sess)          
{
    return sess->alloc(nbytes);
}

    int *
Session::alloc(
    int nbytes)
{
    Session::typetthingheader *head = tempspacehead;

    Session::typetthingheader *xthis = (Session::typetthingheader *) eallocwithtag((unsigned) (sizeof(Session::typetthingheader) + nbytes), SESSTAG);

    assert((((unsigned) xthis) & 1) == 0); // ERROR: ealloc returned unaligned pointer

    xthis->tnext = head;
    xthis->tlast = NULL;

    if (head)
        head->tlast = xthis;

    tempspacehead = xthis;

    ++xthis;
    assert((((unsigned) xthis) & 1) == 0); // ERROR: talloc trying to return unaligned pointer

    return (int *) xthis;
}

    void
Session::free()
{
    Session::typetthingheader *p;

    Session::typetthingheader *ptr;
    for (ptr = tempspacehead; ptr; ptr = p) {
        p = ptr->tnext;
        checkpointer("Session::free: ", (char *) ptr);

        /*
         * if (ptr > (char *) 0x1b0000)
         *     assert(0); // Session::free: ptr pointing into stack region
         */

        efree((char *)ptr);
    }
    tempspacehead = NULL;
}

    void
Session::freeexplicit(
    char *ptr)
{
    checkpointer("Session::freeexplicit: ", ptr);

    Session::typetthingheader *header = (Session::typetthingheader *) ptr;

    --header;

    if (header->tnext)
        header->tnext->tlast = header->tlast;

    if (header->tlast)
        header->tlast->tnext = header->tnext;

    if (header == tempspacehead)
        tempspacehead = header->tnext;

    efree((char *)header);
}

    void
Session::freeitemset(
    typeitemset itemset)
{
    typeitem *nextitem;

    for (; itemset; itemset = nextitem) {
        checkitem("Session::freeitemset: ", itemset);

        nextitem = (typeitem *) ((typeitemheader *) itemset)->next;

        if (((typeitemheader *) itemset)->itemid == VSPECID)
            freeitemset((typeitemset) ((typevspec *) itemset)->vspanset);

        freeexplicit((char *)itemset);
    }
}

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