Deep bug -- LINUX5250

Hi all,

A client of mine using the xt5250 and tn5250 applications compiled from
source (version 0.15.6) has encountered a reproduceable crash with core
dump.  From their informal observation, it appears that the problem
occurs when they are three "screens" deep (you know, those little AS400
ASCII "windows").  Here is the message that appears when tn5250 is run
out of a terminal:

        Assertion tn5250_attribute (attr) failed at wtd.c, line 329.  A
        borted (core dumped)

Sure enough, that part of the code looks to be an assertion:

    298 /****i* lib5250/tn5250_wtd_context_write_field
    299  * NAME
    300  *    tn5250_wtd_context_write_field
    301  * SYNOPSIS
    302  *    tn5250_wtd_context_write_field (This, field, attr);
    303  * INPUTS
    304  *    Tn5250WTDContext *   This       -
    305  *    Tn5250Field *        field      -
    306  *    unsigned char        attr       -
    307  * DESCRIPTION
    308  *    Write the SF order and the field's information.
    309  *****/
    310 static void tn5250_wtd_context_write_field (Tn5250WTDContext
*This, Tn5250Field *field, unsigned char attr)
    311 {
    312    TN5250_LOG (("Writing SF order in stream data.\n"));
    313 
    314    tn5250_wtd_context_putc (This, SF);
    315 
    316    /* Put the field format word. */
    317    if (field->FFW != 0) {
    318       tn5250_wtd_context_putc (This, (unsigned char)(field->FFW
>> 8));
    319       tn5250_wtd_context_putc (This, (unsigned char)(field->FFW
& 0x00ff));
    320 
    321       /* Put the field control word(s). */
    322       if (field->FCW != 0) {
    323          tn5250_wtd_context_putc (This, (unsigned
char)(field->FCW >> 8));
    324          tn5250_wtd_context_putc (This, (unsigned
char)(field->FCW & 0x00ff));
    325       }
    326    }
    327 
    328    /* Put the screen attribute. */
*-> 329    TN5250_ASSERT (tn5250_attribute (attr));
    330    tn5250_wtd_context_putc (This, attr);
    331 
    332    /* Put the field length. */
    333    tn5250_wtd_context_putc (This, (unsigned char)(field->length
>> 8));
    334    tn5250_wtd_context_putc (This, (unsigned char)(field->length
& 0x00ff));
    335 }


Anyone have any ideas what might be causing this error?  Has this
already been found and solved (new to the list)?  How difficult would
this be to debug?

Jason


-- 
  __________________________________  __________________________
 /         Jason Bechtel            \/  Phone:  (419) 861-3331  \
/       Unique Systems, Inc.         \    FAX:  (419) 861-3340   \
) 6920 Spring Valley Drive, Ste. 106 (                           (
\        Holland, OH 43528           / mailto:jason@uniqsys.com  /
 \__________________________________/\__________________________/
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