1 files changed, 217 insertions, 0 deletions
diff --git a/unix/tclLoadNext.c b/unix/tclLoadNext.c
new file mode 100644
index 0000000..eb0affa
--- /dev/null
+++ b/unix/tclLoadNext.c
@@ -0,0 +1,217 @@
+/*
+ * tclLoadNext.c --
+ *
+ *	This procedure provides a version of the TclLoadFile that works with
+ *	NeXTs rld_* dynamic loading. This file provided by Pedja Bogdanovich.
+ *
+ * Copyright (c) 1995-1997 Sun Microsystems, Inc.
+ *
+ * See the file "license.terms" for information on usage and redistribution
+ * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ */
+
+#include "tclInt.h"
+#include <mach-o/rld.h>
+#include <streams/streams.h>
+
+/* Static procedures defined within this file */
+
+static void *		FindSymbol(Tcl_Interp *interp,
+			    Tcl_LoadHandle loadHandle, const char* symbol);
+static void		UnloadFile(Tcl_LoadHandle loadHandle);
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TclpDlopen --
+ *
+ *	Dynamically loads a binary code file into memory and returns a handle
+ *	to the new code.
+ *
+ * Results:
+ *	A standard Tcl completion code.  If an error occurs, an error message
+ *	is left in the interp's result.
+ *
+ * Side effects:
+ *	New code suddenly appears in memory.
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+TclpDlopen(
+    Tcl_Interp *interp,		/* Used for error reporting. */
+    Tcl_Obj *pathPtr,		/* Name of the file containing the desired
+				 * code (UTF-8). */
+    Tcl_LoadHandle *loadHandle,	/* Filled with token for dynamically loaded
+				 * file which will be passed back to
+				 * (*unloadProcPtr)() to unload the file. */
+    Tcl_FSUnloadFileProc **unloadProcPtr,
+				/* Filled with address of Tcl_FSUnloadFileProc
+				 * function which should be used for this
+				 * file. */
+    int flags)
+{
+    Tcl_LoadHandle newHandle;
+    struct mach_header *header;
+    char *fileName;
+    char *files[2];
+    const char *native;
+    int result = 1;
+
+    NXStream *errorStream = NXOpenMemory(0,0,NX_READWRITE);
+
+    fileName = Tcl_GetString(pathPtr);
+
+    /*
+     * First try the full path the user gave us. This is particularly
+     * important if the cwd is inside a vfs, and we are trying to load using a
+     * relative path.
+     */
+
+    native = Tcl_FSGetNativePath(pathPtr);
+    files = {native,NULL};
+
+    result = rld_load(errorStream, &header, files, NULL);
+
+    if (!result) {
+	/*
+	 * Let the OS loader examine the binary search path for whatever
+	 * string the user gave us which hopefully refers to a file on the
+	 * binary path
+	 */
+
+	Tcl_DString ds;
+
+	native = Tcl_UtfToExternalDString(NULL, fileName, -1, &ds);
+	files = {native,NULL};
+	result = rld_load(errorStream, &header, files, NULL);
+	Tcl_DStringFree(&ds);
+    }
+
+    if (!result) {
+	char *data;
+	int len, maxlen;
+
+	NXGetMemoryBuffer(errorStream, &data, &len, &maxlen);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't load file \"%s\": %s", fileName, data));
+	NXCloseMemory(errorStream, NX_FREEBUFFER);
+	return TCL_ERROR;
+    }
+    NXCloseMemory(errorStream, NX_FREEBUFFER);
+
+    newHandle = ckalloc(sizeof(Tcl_LoadHandle));
+    newHandle->clientData = INT2PTR(1);
+    newHandle->findSymbolProcPtr = &FindSymbol;
+    newHandle->unloadFileProcPtr = &UnloadFile;
+    *loadHandle = newHandle;
+    *unloadProcPtr = &UnloadFile;
+
+    return TCL_OK;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * FindSymbol --
+ *
+ *	Looks up a symbol, by name, through a handle associated with a
+ *	previously loaded piece of code (shared library).
+ *
+ * Results:
+ *	Returns a pointer to the function associated with 'symbol' if it is
+ *	found. Otherwise returns NULL and may leave an error message in the
+ *	interp's result.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void *
+FindSymbol(
+    Tcl_Interp *interp,
+    Tcl_LoadHandle loadHandle,
+    const char *symbol)
+{
+    Tcl_PackageInitProc *proc = NULL;
+
+    if (symbol) {
+	char sym[strlen(symbol) + 2];
+
+	sym[0] = '_';
+	sym[1] = 0;
+	strcat(sym, symbol);
+	rld_lookup(NULL, sym, (unsigned long *) &proc);
+    }
+    if (proc == NULL && interp != NULL) {
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"cannot find symbol \"%s\"", symbol));
+	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "LOAD_SYMBOL", symbol, NULL);
+    }
+    return proc;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * UnloadFile --
+ *
+ *	Unloads a dynamically loaded binary code file from memory. Code
+ *	pointers in the formerly loaded file are no longer valid after calling
+ *	this function.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	Does nothing.  Can anything be done?
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+UnloadFile(
+    Tcl_LoadHandle loadHandle)	/* loadHandle returned by a previous call to
+				 * TclpDlopen(). The loadHandle is a token
+				 * that represents the loaded file. */
+{
+    ckfree(loadHandle);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TclGuessPackageName --
+ *
+ *	If the "load" command is invoked without providing a package name,
+ *	this procedure is invoked to try to figure it out.
+ *
+ * Results:
+ *	Always returns 0 to indicate that we couldn't figure out a package
+ *	name; generic code will then try to guess the package from the file
+ *	name. A return value of 1 would have meant that we figured out the
+ *	package name and put it in bufPtr.
+ *
+ * Side effects:
+ *	None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+TclGuessPackageName(
+    const char *fileName,	/* Name of file containing package (already
+				 * translated to local form if needed). */
+    Tcl_DString *bufPtr)	/* Initialized empty dstring. Append package
+				 * name to this if possible. */
+{
+    return 0;
+}
+
+/*
+ * Local Variables:
+ * mode: c
+ * c-basic-offset: 4
+ * fill-column: 78
+ * End:
+ */