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);
}
SEXP RTcl_RemoveArrayElem(SEXP args)
{
SEXP x, i;
const char *xstr, *istr;
const void *vmax = vmaxget();
x = CADR(args);
i = CADDR(args);
xstr = translateChar(STRING_ELT(x, 0));
istr = translateChar(STRING_ELT(i, 0));
Tcl_UnsetVar2(RTcl_interp, xstr, istr, 0);
vmaxset(vmax);
return R_NilValue;
}
/* ARGSUSED */
static char *
EnvTraceProc(
ClientData clientData, /* Not used. */
Tcl_Interp *interp, /* Interpreter whose "env" variable is being
* modified. */
const char *name1, /* Better be "env". */
const char *name2, /* Name of variable being modified, or NULL if
* whole array is being deleted (UTF-8). */
int flags) /* Indicates what's happening. */
{
/*
* For array traces, let TclSetupEnv do all the work.
*/
if (flags & TCL_TRACE_ARRAY) {
TclSetupEnv(interp);
return NULL;
}
/*
* If name2 is NULL, then return and do nothing.
*/
if (name2 == NULL) {
return NULL;
}
/*
* If a value is being set, call TclSetEnv to do all of the work.
*/
if (flags & TCL_TRACE_WRITES) {
const char *value;
value = Tcl_GetVar2(interp, "env", name2, TCL_GLOBAL_ONLY);
TclSetEnv(name2, value);
}
/*
* If a value is being read, call TclGetEnv to do all of the work.
*/
if (flags & TCL_TRACE_READS) {
Tcl_DString valueString;
const char *value = TclGetEnv(name2, &valueString);
if (value == NULL) {
Tcl_UnsetVar2(interp, name1, name2, 0);
return NULL;
}
Tcl_SetVar2(interp, name1, name2, value, 0);
Tcl_DStringFree(&valueString);
}
/*
* For unset traces, let TclUnsetEnv do all the work.
*/
if (flags & TCL_TRACE_UNSETS) {
TclUnsetEnv(name2);
}
return NULL;
}