[213b6a2b9d] Make level parsing honor EIAS.

1 files changed, 46 insertions, 72 deletions

diff --git a/generic/tclProc.c b/generic/tclProc.c
index ac65bde..9770d26 100644
--- a/generic/tclProc.c
+++ b/generic/tclProc.c
@@ -808,94 +808,68 @@ TclObjGetFrame(
     register Interp *iPtr = (Interp *) interp;
     int curLevel, level, result;
     CallFrame *framePtr;
-    const char *name;
+    const char *name = NULL;
 
     /*
      * Parse object to figure out which level number to go to.
      */
 
-    result = 1;
+    result = 0;
     curLevel = iPtr->varFramePtr->level;
-    if (objPtr == NULL) {
-	name = "1";
-	goto haveLevel1;
-    }
 
-    name = TclGetString(objPtr);
-    if (objPtr->typePtr == &levelReferenceType) {
-	if (objPtr->internalRep.twoPtrValue.ptr1) {
-	    level = curLevel - PTR2INT(objPtr->internalRep.twoPtrValue.ptr2);
-	} else {
-	    level = PTR2INT(objPtr->internalRep.twoPtrValue.ptr2);
-	}
-	if (level < 0) {
-	    goto levelError;
-	}
-	/* TODO: Consider skipping the typePtr checks */
-    } else if (objPtr->typePtr == &tclIntType
-#ifndef TCL_WIDE_INT_IS_LONG
-	    || objPtr->typePtr == &tclWideIntType
-#endif
-	    ) {
-	if (TclGetIntFromObj(NULL, objPtr, &level) != TCL_OK || level < 0) {
-	    goto levelError;
-	}
-	level = curLevel - level;
-    } else if (*name == '#') {
-	if (Tcl_GetInt(interp, name+1, &level) != TCL_OK || level < 0) {
-	    goto levelError;
-	}
-
-	/*
-	 * Cache for future reference.
-	 */
-
-	TclFreeIntRep(objPtr);
-	objPtr->typePtr = &levelReferenceType;
-	objPtr->internalRep.twoPtrValue.ptr1 = (void *) 0;
-	objPtr->internalRep.twoPtrValue.ptr2 = INT2PTR(level);
-    } else if (isdigit(UCHAR(*name))) { /* INTL: digit */
-	if (Tcl_GetInt(interp, name, &level) != TCL_OK) {
-	    return -1;
-	}
-
-	/*
-	 * Cache for future reference.
-	 */
+    /*
+     * Check for integer first, since that has potential to spare us
+     * a generation of a stringrep.
+     */
 
-	TclFreeIntRep(objPtr);
-	objPtr->typePtr = &levelReferenceType;
-	objPtr->internalRep.twoPtrValue.ptr1 = (void *) 1;
-	objPtr->internalRep.twoPtrValue.ptr2 = INT2PTR(level);
+    if (objPtr == NULL) {
+	/* Do nothing */
+    } else if (TCL_OK == Tcl_GetIntFromObj(NULL, objPtr, &level)
+	    && (level >= 0)) {
 	level = curLevel - level;
+	result = 1;
+    } else if (objPtr->typePtr == &levelReferenceType) {
+	level = PTR2INT(objPtr->internalRep.twoPtrValue.ptr1);
+	result = 1;
     } else {
-	/*
-	 * Don't cache as the object *isn't* a level reference (might even be
-	 * NULL...)
-	 */
+	name = TclGetString(objPtr);
+	if (name[0] == '#') {
+	    if (TCL_OK == Tcl_GetInt(NULL, name+1, &level) && level >= 0) {
+		TclFreeIntRep(objPtr);
+		objPtr->typePtr = &levelReferenceType;
+		objPtr->internalRep.twoPtrValue.ptr1 = INT2PTR(level);
+		result = 1;
+	    } else {
+		result = -1;
+	    }
+	} else if (isdigit(UCHAR(name[0]))) { /* INTL: digit */
+	    /*
+	     * If this were an integer, we'd have succeeded already.
+	     * Docs say we have to treat this as a 'bad level'  error.
+	     */
+	    result = -1;
+	}
+    }
 
-    haveLevel1:
+    if (result == 0) {
 	level = curLevel - 1;
-	result = 0;
+	name = "1";
     }
-
-    /*
-     * Figure out which frame to use, and return it to the caller.
-     */
-
-    for (framePtr = iPtr->varFramePtr; framePtr != NULL;
-	    framePtr = framePtr->callerVarPtr) {
-	if (framePtr->level == level) {
-	    break;
+    if (result != -1) {
+	if (level >= 0) {
+	    for (framePtr = iPtr->varFramePtr; framePtr != NULL;
+		    framePtr = framePtr->callerVarPtr) {
+		if (framePtr->level == level) {
+		    *framePtrPtr = framePtr;
+		    return result;
+		}
+	    }
+	}
+	if (name == NULL) {
+	    name = TclGetString(objPtr);
 	}
     }
-    if (framePtr == NULL) {
-	goto levelError;
-    }
-    *framePtrPtr = framePtr;
-    return result;
 
-  levelError:
     Tcl_SetObjResult(interp, Tcl_ObjPrintf("bad level \"%s\"", name));
     Tcl_SetErrorCode(interp, "TCL", "VALUE", "STACKLEVEL", NULL);
     return -1;