Fossil

#include "config.h"

#ifdef FOSSIL_ENABLE_TCL

#include "th.h"
#include "tcl.h"

/*
** Has the decision about whether or not to use Tcl_EvalObjv already been made
** via the Makefile?
 */
#if !defined(USE_TCL_EVALOBJV)
/*
** Are we being compiled against Tcl 8.6b1 or b2?  This check is [mostly]
** wrong for at the following reason:
**
** 1. Technically, this check is completely useless when the stubs mechanism
**    is in use.  In that case, a runtime version check would be required and
**    that has not been implemented.
**
** However, if a particular user compiles and runs against Tcl 8.6b1 or b2,
** this will cause a fallback to using the "conservative" method of directly
** invoking a Tcl command.  In that case, potential crashes will be avoided if
** the user just so happened to compile or run against Tcl 8.6b1 or b2.
 */
#if (TCL_MAJOR_VERSION == 8) && (TCL_MINOR_VERSION == 6) && \
    (TCL_RELEASE_LEVEL == TCL_BETA_RELEASE) && (TCL_RELEASE_SERIAL < 3)
/*
** Workaround NRE-specific issue in Tcl_EvalObjCmd (SF bug #3399564) by using
** Tcl_EvalObjv instead of invoking the objProc directly.
 */
#  define USE_TCL_EVALOBJV    (1)
#else
/*
** We should be able to safely use Tcl_GetCommandInfoFromToken, when the need
** arises, to invoke a specific Tcl command "directly" with some arguments.
 */
#  define USE_TCL_EVALOBJV    (0)
#endif /* (TCL_MAJOR_VERSION > 8) ... */
#endif /* !defined(USE_TCL_EVALOBJV) */

/*
** These macros are designed to reduce the redundant code required to marshal
** arguments from TH1 to Tcl.
 */
#define USE_ARGV_TO_OBJV() \
  int objc;                \
  Tcl_Obj **objv;          \

  Th_Interp *interp,
  void *ctx,
  int argc,
  const char **argv,
  int *argl
){
  Tcl_Interp *tclInterp;
#if !defined(USE_TCL_EVALOBJV) || !USE_TCL_EVALOBJV
  Tcl_Command command;
  Tcl_CmdInfo cmdInfo;
#endif /* !defined(USE_TCL_EVALOBJV) || !USE_TCL_EVALOBJV */
  int rc = TH_OK;
  int nResult;
  const char *zResult;
#if !defined(USE_TCL_EVALOBJV) || !USE_TCL_EVALOBJV
  Tcl_Obj *objPtr;
#endif /* !defined(USE_TCL_EVALOBJV) || !USE_TCL_EVALOBJV */
  USE_ARGV_TO_OBJV();

  if( createTclInterp(interp, ctx)!=TH_OK ){
    return TH_ERROR;
  }
  if( argc<2 ){
    return Th_WrongNumArgs(interp, "tclInvoke command ?arg ...?");
  }
  tclInterp = GET_CTX_TCL_INTERP(ctx);
  if( !tclInterp || Tcl_InterpDeleted(tclInterp) ){
    Th_ErrorMessage(interp, "invalid Tcl interpreter", (const char *)"", 0);
    return TH_ERROR;
  }
  rc = notifyPreOrPostEval(0, interp, ctx, argc, argv, argl, rc);
  if( rc!=TH_OK ){
    return rc;
  }
  Tcl_Preserve((ClientData)tclInterp);
#if !defined(USE_TCL_EVALOBJV) || !USE_TCL_EVALOBJV
  objPtr = Tcl_NewStringObj(argv[1], argl[1]);
  Tcl_IncrRefCount(objPtr);
  command = Tcl_GetCommandFromObj(tclInterp, objPtr);
  if( !command || Tcl_GetCommandInfoFromToken(command, &cmdInfo)==0 ){
    Th_ErrorMessage(interp, "Tcl command not found:", argv[1], argl[1]);
    Tcl_DecrRefCount(objPtr);
    Tcl_Release((ClientData)tclInterp);
    return TH_ERROR;
  }
  if( !cmdInfo.objProc ){
    Th_ErrorMessage(interp, "cannot invoke Tcl command:", argv[1], argl[1]);
    Tcl_DecrRefCount(objPtr);
    Tcl_Release((ClientData)tclInterp);
    return TH_ERROR;
  }
  Tcl_DecrRefCount(objPtr);
#endif /* !defined(USE_TCL_EVALOBJV) || !USE_TCL_EVALOBJV */
  COPY_ARGV_TO_OBJV();
#if defined(USE_TCL_EVALOBJV) && USE_TCL_EVALOBJV
  rc = Tcl_EvalObjv(tclInterp, objc, objv, 0);
#else
  Tcl_ResetResult(tclInterp);
  rc = cmdInfo.objProc(cmdInfo.objClientData, tclInterp, objc, objv);
#endif /* defined(USE_TCL_EVALOBJV) && USE_TCL_EVALOBJV */
  FREE_ARGV_TO_OBJV();
  zResult = getTclResult(tclInterp, &nResult);
  Th_SetResult(interp, zResult, nResult);
  Tcl_Release((ClientData)tclInterp);
  rc = notifyPreOrPostEval(1, interp, ctx, argc, argv, argl, rc);
  return rc;
}