Implement TkCygwinMainEx for loading Cygwin's Tk_MainEx from the Tk dll

4 files changed, 77 insertions, 7 deletions

diff --git a/generic/tkInt.decls b/generic/tkInt.decls
index 309532b..45cc31b 100644
--- a/generic/tkInt.decls
+++ b/generic/tkInt.decls
@@ -1628,7 +1628,7 @@ declare 80 aqua {
 	    XSegment *segments, int nsegments)
 }
 declare 81 aqua {
-    int XForceScreenSaver(Display *display, int mode)
+    void XForceScreenSaver(Display *display, int mode)
 }
 declare 82 aqua {
     int XDrawLine(Display *d, Drawable dr, GC g, int x1, int y1,
diff --git a/generic/tkIntXlibDecls.h b/generic/tkIntXlibDecls.h
index 07ad01e..9ccfe8d 100644
--- a/generic/tkIntXlibDecls.h
+++ b/generic/tkIntXlibDecls.h
@@ -1122,7 +1122,7 @@ EXTERN void		XDrawSegments(Display *display, Drawable d, GC gc,
 #ifndef XForceScreenSaver_TCL_DECLARED
 #define XForceScreenSaver_TCL_DECLARED
 /* 81 */
-EXTERN int		XForceScreenSaver(Display *display, int mode);
+EXTERN void		XForceScreenSaver(Display *display, int mode);
 #endif
 #ifndef XDrawLine_TCL_DECLARED
 #define XDrawLine_TCL_DECLARED
@@ -1383,7 +1383,7 @@ typedef struct TkIntXlibStubs {
     void (*xSetWMClientMachine) (Display *display, Window w, XTextProperty *text_prop); /* 78 */
     Status (*xStringListToTextProperty) (char **list, int count, XTextProperty *text_prop_return); /* 79 */
     void (*xDrawSegments) (Display *display, Drawable d, GC gc, XSegment *segments, int nsegments); /* 80 */
-    int (*xForceScreenSaver) (Display *display, int mode); /* 81 */
+    void (*xForceScreenSaver) (Display *display, int mode); /* 81 */
     int (*xDrawLine) (Display *d, Drawable dr, GC g, int x1, int y1, int x2, int y2); /* 82 */
     int (*xFillRectangle) (Display *display, Drawable d, GC gc, int x, int y, unsigned int width, unsigned int height); /* 83 */
     void (*xClearWindow) (Display *d, Window w); /* 84 */
diff --git a/generic/tkMain.c b/generic/tkMain.c
index c6d5238..99caf27 100644
--- a/generic/tkMain.c
+++ b/generic/tkMain.c
@@ -139,15 +139,20 @@ Tk_MainEx(
 	abort();
     }
 
-#if defined(__WIN32__) && !defined(STATIC_BUILD)
+#if defined(__WIN32__) && !defined(__WIN64__) && !defined(STATIC_BUILD)
+    extern int TkCygwinMainEx(int, char **, Tcl_AppInitProc *, Tcl_Interp *);
+
     if (tclStubsPtr->reserved9) {
 	/* We are running win32 Tk under Cygwin, so let's check
 	 * whether the env("DISPLAY") variable or the -display
 	 * argument is set. If so, we really want to run the
-	 * Tk_MainEx function of libtk.dll, not this one. */
- 	if (Tcl_GetVar2(interp, "env", "DISPLAY", TCL_GLOBAL_ONLY)) {
+	 * Tk_MainEx function of libtk8.?.dll, not this one. */
+	if (Tcl_GetVar2(interp, "env", "DISPLAY", TCL_GLOBAL_ONLY)) {
 	loadCygwinTk:
-	    Tcl_Panic("Should load libtk.dll now, not yet implemented");
+	    if (TkCygwinMainEx(argc, argv, appInitProc, interp)) {
+		/* Should never reach here. */
+		return;
+	    }
 	} else {
 	    int i;
 
diff --git a/generic/tkWindow.c b/generic/tkWindow.c
index 6892360..995f71f 100644
--- a/generic/tkWindow.c
+++ b/generic/tkWindow.c
@@ -2831,6 +2831,51 @@ DeleteWindowsExitProc(
     tsdPtr->initialized = 0;
 }
 
+#if defined(__WIN32__) && !defined(__WIN64__)
+
+static HMODULE tkcygwindll = NULL;
+
+/*
+ * Run Tk_MainEx from libtk8.?.dll
+ *
+ * This function is only ever called from wish8.4.exe, the cygwin
+ * port of Tcl. This means that the system encoding is utf-8,
+ * so we don't have to do any encoding conversions.
+ */
+int
+TkCygwinMainEx(argc, argv, appInitProc, interp)
+    int argc;				/* Number of arguments. */
+    char **argv;			/* Array of argument strings. */
+    Tcl_AppInitProc *appInitProc;	/* Application-specific initialization
+					 * procedure to call after most
+					 * initialization but before starting
+					 * to execute commands. */
+    Tcl_Interp *interp;
+{
+    char name[MAX_PATH];
+    int len;
+    void (*sym)(int, char **, Tcl_AppInitProc *, Tcl_Interp *);
+
+    /* construct "<path>/libtk8.?.dll", from "<path>/tk8?.dll" */
+	len = GetModuleFileName(Tk_GetHINSTANCE(), name, MAX_PATH);
+	name[len-2] = '.';
+	name[len-1] = name[len-5];
+	strcpy(name+len, ".dll");
+	memcpy(name+len-8, "libtk8", 6);
+
+	tkcygwindll = LoadLibrary(name);
+	if (!tkcygwindll) {
+	    /* dll is not present */
+	    return 0;
+	}
+	sym = (void (*)(int, char **, Tcl_AppInitProc *, Tcl_Interp *)) GetProcAddress(tkcygwindll, "Tk_MainEx");
+	if (!sym) {
+		return 0;
+	}
+	sym(argc, argv, appInitProc, interp);
+    return 1;
+}
+#endif
 /*
  *----------------------------------------------------------------------
  *
@@ -2858,6 +2903,16 @@ int
 Tk_Init(
     Tcl_Interp *interp)		/* Interpreter to initialize. */
 {
+#if defined(__WIN32__) && !defined(__WIN64__)
+    if (tkcygwindll) {
+	int (*sym)(Tcl_Interp *);
+
+	sym = (int (*)(Tcl_Interp *)) GetProcAddress(tkcygwindll, "Tk_Init");
+	if (sym) {
+	    return sym(interp);
+	}
+    }
+#endif
     return Initialize(interp);
 }
 
@@ -2921,6 +2976,16 @@ Tk_SafeInit(
      * checked at several places to differentiate the two initialisations.
      */
 
+#if defined(__WIN32__) && !defined(__WIN64__)
+    if (tkcygwindll) {
+	int (*sym)(Tcl_Interp *);
+
+	sym = (int (*)(Tcl_Interp *)) GetProcAddress(tkcygwindll, "Tk_SafeInit");
+	if (sym) {
+	    return sym(interp);
+	}
+    }
+#endif
     return Initialize(interp);
 }