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authorrjohnson <rjohnson>1998-03-26 14:56:55 (GMT)
committerrjohnson <rjohnson>1998-03-26 14:56:55 (GMT)
commit72d823b9193f9ee2b0318563b49363cd08c11f24 (patch)
treec168cc164a71f320db9dcdfe7518ba7bd0d2c8d9 /win/tclWinLoad.c
parent2b5738da524e944cda39e24c0a87b745a43bd8c3 (diff)
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+/*
+ * tclWinLoad.c --
+ *
+ * This procedure provides a version of the TclLoadFile that
+ * works with the Windows "LoadLibrary" and "GetProcAddress"
+ * API for dynamic loading.
+ *
+ * Copyright (c) 1995 Sun Microsystems, Inc.
+ *
+ * See the file "license.terms" for information on usage and redistribution
+ * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ *
+ * SCCS: @(#) tclWinLoad.c 1.6 96/02/15 11:54:07
+ */
+
+#include "tclInt.h"
+#include "tclPort.h"
+
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TclLoadFile --
+ *
+ * Dynamically loads a binary code file into memory and returns
+ * the addresses of two procedures within that file, if they
+ * are defined.
+ *
+ * Results:
+ * A standard Tcl completion code. If an error occurs, an error
+ * message is left in interp->result.
+ *
+ * Side effects:
+ * New code suddenly appears in memory.
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+TclLoadFile(interp, fileName, sym1, sym2, proc1Ptr, proc2Ptr)
+ Tcl_Interp *interp; /* Used for error reporting. */
+ char *fileName; /* Name of the file containing the desired
+ * code. */
+ char *sym1, *sym2; /* Names of two procedures to look up in
+ * the file's symbol table. */
+ Tcl_PackageInitProc **proc1Ptr, **proc2Ptr;
+ /* Where to return the addresses corresponding
+ * to sym1 and sym2. */
+{
+ HINSTANCE handle;
+ char *buffer;
+
+ handle = TclWinLoadLibrary(fileName);
+ if (handle == NULL) {
+ Tcl_AppendResult(interp, "couldn't load file \"", fileName,
+ "\": ", Tcl_PosixError(interp), (char *) NULL);
+ return TCL_ERROR;
+ }
+
+ /*
+ * For each symbol, check for both Symbol and _Symbol, since Borland
+ * generates C symbols with a leading '_' by default.
+ */
+
+ *proc1Ptr = (Tcl_PackageInitProc *) GetProcAddress(handle, sym1);
+ if (*proc1Ptr == NULL) {
+ buffer = ckalloc(strlen(sym1)+2);
+ buffer[0] = '_';
+ strcpy(buffer+1, sym1);
+ *proc1Ptr = (Tcl_PackageInitProc *) GetProcAddress(handle, buffer);
+ ckfree(buffer);
+ }
+
+ *proc2Ptr = (Tcl_PackageInitProc *) GetProcAddress(handle, sym2);
+ if (*proc2Ptr == NULL) {
+ buffer = ckalloc(strlen(sym2)+2);
+ buffer[0] = '_';
+ strcpy(buffer+1, sym2);
+ *proc2Ptr = (Tcl_PackageInitProc *) GetProcAddress(handle, buffer);
+ ckfree(buffer);
+ }
+
+ return TCL_OK;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * 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(fileName, bufPtr)
+ 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;
+}