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tclOS2Load.c
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C/C++ Source or Header
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2001-02-09
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/*
* tclOS2Load.c --
*
* This procedure provides a version of the TclLoadFile that
* works with the OS/2 "DosLoadModule" and "DosQueryProcAddr"
* APIs for dynamic loading.
*
* Copyright (c) 1995 Sun Microsystems, Inc.
* Copyright (c) 1996-2001 Illya Vaes
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "tclOS2Int.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. */
{
HMODULE handle;
char *buffer;
#ifdef VERBOSE
printf("TclLoadFile %s %s %s\n", fileName, sym1, sym2);
fflush(stdout);
#endif
handle = TclOS2LoadLibrary(fileName);
if (handle == NULLHANDLE) {
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 some
* compilers generate C symbols with a leading '_' by default.
*/
rc = DosQueryProcAddr(handle, 0L, sym1, (PFN *)proc1Ptr);
if (rc != NO_ERROR) {
#ifdef VERBOSE
printf("DosQueryProcAddr %s ERROR %d\n", sym1, rc);
#endif
buffer = ckalloc(strlen(sym1)+2);
buffer[0] = '_';
strcpy(buffer+1, sym1);
rc = DosQueryProcAddr(handle, 0L, buffer, (PFN *)proc1Ptr);
if (rc != NO_ERROR) {
#ifdef VERBOSE
printf("DosQueryProcAddr %s ERROR %d\n", buffer, rc);
#endif
*proc1Ptr = NULL;
}
#ifdef VERBOSE
else {
printf("DosQueryProcAddr %s OK\n", buffer, rc);
}
#endif
ckfree(buffer);
}
#ifdef VERBOSE
else {
printf("DosQueryProcAddr %s OK\n", sym1, rc);
}
#endif
rc = DosQueryProcAddr(handle, 0L, sym2, (PFN *)proc2Ptr);
if (rc != NO_ERROR) {
#ifdef VERBOSE
printf("DosQueryProcAddr %s ERROR %d\n", sym2, rc);
#endif
buffer = ckalloc(strlen(sym2)+2);
buffer[0] = '_';
strcpy(buffer+1, sym2);
rc = DosQueryProcAddr(handle, 0L, buffer, (PFN *)proc2Ptr);
if (rc != NO_ERROR) {
#ifdef VERBOSE
printf("DosQueryProcAddr %s ERROR %d\n", buffer, rc);
#endif
*proc2Ptr = NULL;
}
#ifdef VERBOSE
else {
printf("DosQueryProcAddr %s OK\n", buffer, rc);
}
#endif
ckfree(buffer);
}
#ifdef VERBOSE
else {
printf("DosQueryProcAddr %s OK\n", sym2, rc);
}
#endif
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;
}