void
TclSetupEnv(
Tcl_Interp *interp) /* Interpreter whose "env" array is to be
* managed. */
{
Tcl_DString envString;
char *p1, *p2;
int i;
/*
* Synchronize the values in the environ array with the contents of the
* Tcl "env" variable. To do this:
* 1) Remove the trace that fires when the "env" var is unset.
* 2) Unset the "env" variable.
* 3) If there are no environ variables, create an empty "env" array.
* Otherwise populate the array with current values.
* 4) Add a trace that synchronizes the "env" array.
*/
Tcl_UntraceVar2(interp, "env", NULL,
TCL_GLOBAL_ONLY | TCL_TRACE_WRITES | TCL_TRACE_UNSETS |
TCL_TRACE_READS | TCL_TRACE_ARRAY, EnvTraceProc, NULL);
Tcl_UnsetVar2(interp, "env", NULL, TCL_GLOBAL_ONLY);
if (environ[0] == NULL) {
Tcl_Obj *varNamePtr;
TclNewLiteralStringObj(varNamePtr, "env");
Tcl_IncrRefCount(varNamePtr);
TclArraySet(interp, varNamePtr, NULL);
Tcl_DecrRefCount(varNamePtr);
} else {
Tcl_MutexLock(&envMutex);
for (i = 0; environ[i] != NULL; i++) {
p1 = Tcl_ExternalToUtfDString(NULL, environ[i], -1, &envString);
p2 = strchr(p1, '=');
if (p2 == NULL) {
/*
* This condition seem to happen occasionally under some
* versions of Solaris, or when encoding accidents swallow the
* '='; ignore the entry.
*/
continue;
}
p2++;
p2[-1] = '\0';
Tcl_SetVar2(interp, "env", p1, p2, TCL_GLOBAL_ONLY);
Tcl_DStringFree(&envString);
}
Tcl_MutexUnlock(&envMutex);
}
Tcl_TraceVar2(interp, "env", NULL,
TCL_GLOBAL_ONLY | TCL_TRACE_WRITES | TCL_TRACE_UNSETS |
TCL_TRACE_READS | TCL_TRACE_ARRAY, EnvTraceProc, NULL);
}
/* ARGSUSED */
static char *
ScaleVarProc(
ClientData clientData, /* Information about button. */
Tcl_Interp *interp, /* Interpreter containing variable. */
const char *name1, /* Name of variable. */
const char *name2, /* Second part of variable name. */
int flags) /* Information about what happened. */
{
register TkScale *scalePtr = clientData;
const char *resultStr;
double value;
Tcl_Obj *valuePtr;
int result;
/*
* If the variable is unset, then immediately recreate it unless the whole
* interpreter is going away.
*/
if (flags & TCL_TRACE_UNSETS) {
if ((flags & TCL_TRACE_DESTROYED) && !(flags & TCL_INTERP_DESTROYED)) {
Tcl_TraceVar2(interp, Tcl_GetString(scalePtr->varNamePtr),
NULL, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
ScaleVarProc, clientData);
scalePtr->flags |= NEVER_SET;
TkScaleSetValue(scalePtr, scalePtr->value, 1, 0);
}
return NULL;
}
/*
* If we came here because we updated the variable (in TkScaleSetValue),
* then ignore the trace. Otherwise update the scale with the value of the
* variable.
*/
if (scalePtr->flags & SETTING_VAR) {
return NULL;
}
resultStr = NULL;
valuePtr = Tcl_ObjGetVar2(interp, scalePtr->varNamePtr, NULL,
TCL_GLOBAL_ONLY);
result = Tcl_GetDoubleFromObj(interp, valuePtr, &value);
if (result != TCL_OK) {
resultStr = "can't assign non-numeric value to scale variable";
ScaleSetVariable(scalePtr);
} else {
scalePtr->value = TkRoundToResolution(scalePtr, value);
/*
* This code is a bit tricky because it sets the scale's value before
* calling TkScaleSetValue. This way, TkScaleSetValue won't bother to
* set the variable again or to invoke the -command. However, it also
* won't redisplay the scale, so we have to ask for that explicitly.
*/
TkScaleSetValue(scalePtr, scalePtr->value, 1, 0);
}
TkEventuallyRedrawScale(scalePtr, REDRAW_SLIDER);
return (char *) resultStr;
}
static int
ConfigureScale(
Tcl_Interp *interp, /* Used for error reporting. */
register TkScale *scalePtr, /* Information about widget; may or may not
* already have values for some fields. */
int objc, /* Number of valid entries in objv. */
Tcl_Obj *const objv[]) /* Argument values. */
{
Tk_SavedOptions savedOptions;
Tcl_Obj *errorResult = NULL;
int error;
double varValue;
/*
* Eliminate any existing trace on a variable monitored by the scale.
*/
if (scalePtr->varNamePtr != NULL) {
Tcl_UntraceVar2(interp, Tcl_GetString(scalePtr->varNamePtr),
NULL, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
ScaleVarProc, scalePtr);
}
for (error = 0; error <= 1; error++) {
if (!error) {
/*
* First pass: set options to new values.
*/
if (Tk_SetOptions(interp, (char *) scalePtr,
scalePtr->optionTable, objc, objv, scalePtr->tkwin,
&savedOptions, NULL) != TCL_OK) {
continue;
}
} else {
/*
* Second pass: restore options to old values.
*/
errorResult = Tcl_GetObjResult(interp);
Tcl_IncrRefCount(errorResult);
Tk_RestoreSavedOptions(&savedOptions);
}
/*
* If the scale is tied to the value of a variable, then set the
* scale's value from the value of the variable, if it exists and it
* holds a valid double value.
*/
if (scalePtr->varNamePtr != NULL) {
double value;
Tcl_Obj *valuePtr;
valuePtr = Tcl_ObjGetVar2(interp, scalePtr->varNamePtr, NULL,
TCL_GLOBAL_ONLY);
if ((valuePtr != NULL) &&
(Tcl_GetDoubleFromObj(NULL, valuePtr, &value) == TCL_OK)) {
scalePtr->value = TkRoundToResolution(scalePtr, value);
}
}
/*
* Several options need special processing, such as parsing the
* orientation and creating GCs.
*/
scalePtr->fromValue = TkRoundToResolution(scalePtr,
scalePtr->fromValue);
scalePtr->toValue = TkRoundToResolution(scalePtr, scalePtr->toValue);
scalePtr->tickInterval = TkRoundToResolution(scalePtr,
scalePtr->tickInterval);
/*
* Make sure that the tick interval has the right sign so that
* addition moves from fromValue to toValue.
*/
if ((scalePtr->tickInterval < 0)
^ ((scalePtr->toValue - scalePtr->fromValue) < 0)) {
scalePtr->tickInterval = -scalePtr->tickInterval;
}
ComputeFormat(scalePtr);
scalePtr->labelLength = scalePtr->label ? (int)strlen(scalePtr->label) : 0;
Tk_SetBackgroundFromBorder(scalePtr->tkwin, scalePtr->bgBorder);
if (scalePtr->highlightWidth < 0) {
scalePtr->highlightWidth = 0;
}
scalePtr->inset = scalePtr->highlightWidth + scalePtr->borderWidth;
break;
}
if (!error) {
Tk_FreeSavedOptions(&savedOptions);
}
/*
* Set the scale value to itself; all this does is to make sure that the
* scale's value is within the new acceptable range for the scale. We
* don't set the var here because we need to make special checks for
* possibly changed varNamePtr.
*/
TkScaleSetValue(scalePtr, scalePtr->value, 0, 1);
/*
* Reestablish the variable trace, if it is needed.
*/
if (scalePtr->varNamePtr != NULL) {
Tcl_Obj *valuePtr;
/*
* Set the associated variable only when the new value differs from
* the current value, or the variable doesn't yet exist.
*/
valuePtr = Tcl_ObjGetVar2(interp, scalePtr->varNamePtr, NULL,
TCL_GLOBAL_ONLY);
if ((valuePtr == NULL) || (Tcl_GetDoubleFromObj(NULL,
valuePtr, &varValue) != TCL_OK)) {
ScaleSetVariable(scalePtr);
} else {
char varString[TCL_DOUBLE_SPACE], scaleString[TCL_DOUBLE_SPACE];
sprintf(varString, scalePtr->format, varValue);
sprintf(scaleString, scalePtr->format, scalePtr->value);
if (strcmp(varString, scaleString)) {
ScaleSetVariable(scalePtr);
}
}
Tcl_TraceVar2(interp, Tcl_GetString(scalePtr->varNamePtr),
NULL, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
ScaleVarProc, scalePtr);
}
ScaleWorldChanged(scalePtr);
if (error) {
Tcl_SetObjResult(interp, errorResult);
Tcl_DecrRefCount(errorResult);
return TCL_ERROR;
}
return TCL_OK;
}
void
TclSetupEnv(
Tcl_Interp *interp) /* Interpreter whose "env" array is to be
* managed. */
{
Var *varPtr, *arrayPtr;
Tcl_Obj *varNamePtr;
Tcl_DString envString;
Tcl_HashTable namesHash;
Tcl_HashEntry *hPtr;
Tcl_HashSearch search;
/*
* Synchronize the values in the environ array with the contents of the
* Tcl "env" variable. To do this:
* 1) Remove the trace that fires when the "env" var is updated.
* 2) Find the existing contents of the "env", storing in a hash table.
* 3) Create/update elements for each environ variable, removing
* elements from the hash table as we go.
* 4) Remove the elements for each remaining entry in the hash table,
* which must have existed before yet have no analog in the environ
* variable.
* 5) Add a trace that synchronizes the "env" array.
*/
Tcl_UntraceVar2(interp, "env", NULL,
TCL_GLOBAL_ONLY | TCL_TRACE_WRITES | TCL_TRACE_UNSETS |
TCL_TRACE_READS | TCL_TRACE_ARRAY, EnvTraceProc, NULL);
/*
* Find out what elements are currently in the global env array.
*/
TclNewLiteralStringObj(varNamePtr, "env");
Tcl_IncrRefCount(varNamePtr);
Tcl_InitObjHashTable(&namesHash);
varPtr = TclObjLookupVarEx(interp, varNamePtr, NULL, TCL_GLOBAL_ONLY,
/*msg*/ 0, /*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr);
TclFindArrayPtrElements(varPtr, &namesHash);
/*
* Go through the environment array and transfer its values into Tcl. At
* the same time, remove those elements we add/update from the hash table
* of existing elements, so that after this part processes, that table
* will hold just the parts to remove.
*/
if (environ[0] != NULL) {
int i;
Tcl_MutexLock(&envMutex);
for (i = 0; environ[i] != NULL; i++) {
Tcl_Obj *obj1, *obj2;
char *p1, *p2;
p1 = Tcl_ExternalToUtfDString(NULL, environ[i], -1, &envString);
p2 = strchr(p1, '=');
if (p2 == NULL) {
/*
* This condition seem to happen occasionally under some
* versions of Solaris, or when encoding accidents swallow the
* '='; ignore the entry.
*/
continue;
}
p2++;
p2[-1] = '\0';
obj1 = Tcl_NewStringObj(p1, -1);
obj2 = Tcl_NewStringObj(p2, -1);
Tcl_DStringFree(&envString);
Tcl_IncrRefCount(obj1);
Tcl_IncrRefCount(obj2);
Tcl_ObjSetVar2(interp, varNamePtr, obj1, obj2, TCL_GLOBAL_ONLY);
hPtr = Tcl_FindHashEntry(&namesHash, obj1);
if (hPtr != NULL) {
Tcl_DeleteHashEntry(hPtr);
}
Tcl_DecrRefCount(obj1);
Tcl_DecrRefCount(obj2);
}
Tcl_MutexUnlock(&envMutex);
}
/*
* Delete those elements that existed in the array but which had no
* counterparts in the environment array.
*/
for (hPtr=Tcl_FirstHashEntry(&namesHash, &search); hPtr!=NULL;
hPtr=Tcl_NextHashEntry(&search)) {
Tcl_Obj *elemName = Tcl_GetHashValue(hPtr);
TclObjUnsetVar2(interp, varNamePtr, elemName, TCL_GLOBAL_ONLY);
}
Tcl_DeleteHashTable(&namesHash);
Tcl_DecrRefCount(varNamePtr);
/*
* Re-establish the trace.
*/
Tcl_TraceVar2(interp, "env", NULL,
TCL_GLOBAL_ONLY | TCL_TRACE_WRITES | TCL_TRACE_UNSETS |
TCL_TRACE_READS | TCL_TRACE_ARRAY, EnvTraceProc, NULL);
}
