Re: segmentation fault in t_splay() calling Tcl_Alloc()

From: Anthony Davis (adavis_at_addpower.com)
Date: 10/07/03 

Date: 7 Oct 2003 08:25:34 -0700

> Does your program call malloc()/free() itself besides Tcl_Alloc()?
> Have you checked the pointers there?

No I do not have any explicit calls to malloc()/free() anywhere in the
application, I use only Tcl_Alloc and Tcl_Free().

The call to Tcl_Alloc is actually being made from within
Tcl_NewStringObj if this makes a difference at all.

Here is the code snippet where the error occurs:

  /* the function PVK_read() is a third party function for reading a
   * proprietary data file, it returns a char*. szResult is previously
   * allocated with Tcl_Alloc the length defined in the file's
dictionary +1
   */
  if(PVX_ERROR==(int)(cbBytesRead=PVK_read(pclFilePtr->fh,szResult,
                                       
pclFilePtr->pvkinf->rsz,nPvxRdId))){
    PclSetObjResultPvxError(interp,"pclread");
    return TCL_ERROR;
  }

  szResult[cbBytesRead+1]='\0';
  /* segmentation fault is on this line in Tcl_NewStringObj */
  Tcl_SetObjResult(interp,Tcl_NewStringObj(szResult,strlen(szResult)));
  Tcl_Free(szResult);
  return TCL_OK;

Hope this helps, I would be glad to find out it is something I am
doing wrong if there is anything you can see let me know.
Anthony

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