diff --git a/Mac/think/fopenRF.c b/Mac/think/fopenRF.c
new file mode 100644
index 0000000..04f192e
--- /dev/null
+++ b/Mac/think/fopenRF.c
@@ -0,0 +1,336 @@
+
+/*
+ *  fopen.c
+ *
+ *  Copyright (c) 1991 Symantec Corporation.  All rights reserved.
+ *
+ */
+
+#include <MacHeaders>
+
+#include "stdio.h"
+#include "errno.h"
+#include "string.h"
+#include "ansi_private.h"
+
+extern long _ftype, _fcreator;
+
+#define fcbVPtr(fcb)		(* (VCB **) (fcb + 20))
+#define fcbDirID(fcb)		(* (long *) (fcb + 58))
+#define fcbCName(fcb)		(fcb + 62)
+
+static void setfiletype(StringPtr, int);
+static void stdio_exit(void);
+static int fileio(FILE *, int);
+static int close(FILE *);
+static void replace(unsigned char *, size_t, int, int);
+
+FILE *freopenRF();
+FILE *__openRF();
+
+FILE *
+fopenRF(const char *filename, const char *mode)
+{
+	return(freopenRF(filename, mode, __getfile()));
+}
+
+
+FILE *
+freopenRF(const char *filename, const char *mode, FILE *fp)
+{
+	int omode, oflag;
+	
+		/*  interpret "rwa"  */
+	
+	if (mode[0] == 'r') {
+		omode = fsRdPerm;
+		oflag = 0;
+	}
+	else if (mode[0] == 'w') {
+		omode = fsWrPerm;
+		oflag = F_CREAT+F_TRUNC;
+	}
+	else if (mode[0] == 'a') {
+		omode = fsWrPerm;
+		oflag = F_CREAT+F_APPEND;
+	}
+	else {
+		errno = EINVAL;
+		return(NULL);
+	}
+		
+		/*  interpret "b+"  */
+		
+	if (mode[1] == 'b') {
+		oflag |= F_BINARY;
+		if (mode[2] == '+')
+			omode = fsRdWrPerm;
+	}
+	else if (mode[1] == '+') {
+		omode = fsRdWrPerm;
+		if (mode[2] == 'b')
+			oflag |= F_BINARY;
+	}
+	
+		/*  open the file  */
+		
+	return(__openRF(filename, omode, oflag, fp));
+}
+
+
+FILE *
+__openRF(const char *filename, int omode, int oflag, FILE *fp)
+{
+	IOParam pb;
+	char pname[FILENAME_MAX];
+
+	if (fp == NULL)
+		return(NULL);
+	fclose(fp);
+	
+		/*  set up pb  */
+	
+	pb.ioNamePtr = __c2p(filename, pname);
+	pb.ioVRefNum = 0;
+	pb.ioVersNum = 0;
+	pb.ioPermssn = omode;
+	pb.ioMisc = 0;
+
+		/*  create file  */
+
+	if (oflag & F_CREAT) {
+		PBCreateSync((ParmBlkPtr)&pb);
+		if (pb.ioResult == noErr)
+			oflag &= ~F_TRUNC;
+		else if (pb.ioResult == dupFNErr && !(oflag & F_EXCL))
+			oflag &= ~F_CREAT;
+		else {
+			errno = pb.ioResult;
+			return(NULL);
+		}
+	}
+	
+		/*  open file  */
+		
+	PBOpenRFSync((ParmBlkPtr)&pb);
+	if (pb.ioResult) {
+		errno = pb.ioResult;
+		if (oflag & F_CREAT)
+			PBDeleteSync((ParmBlkPtr)&pb);
+		return(NULL);
+	}
+	fp->refnum = pb.ioRefNum;
+	
+		/*  get/set file length  */
+		
+	if (oflag & F_TRUNC)
+		PBSetEOFSync((ParmBlkPtr)&pb);
+	else if (!(oflag & F_CREAT))
+		PBGetEOFSync((ParmBlkPtr)&pb);
+	fp->len = (fpos_t) pb.ioMisc;
+		
+		/*  initialize rest of FILE structure  */
+		
+	if (oflag & F_APPEND) {
+		fp->append = 1;
+		fp->pos = fp->len;
+	}
+	if (oflag & F_BINARY)
+		fp->binary = 1;
+	setvbuf(fp, NULL, _IOFBF, BUFSIZ);
+	fp->proc = fileio;
+
+		/*  set file type  */
+
+	if (oflag & (F_CREAT|F_TRUNC))
+		setfiletype(pb.ioNamePtr, oflag);
+		
+		/*  done  */
+		
+	__atexit_stdio(stdio_exit);
+	return(fp);
+}
+
+
+/*
+ *  setfiletype - set type/creator of new file
+ *
+ */
+
+static void
+setfiletype(StringPtr name, int oflag)
+{
+	FileParam pb;
+	
+	pb.ioNamePtr = name;
+	pb.ioVRefNum = 0;
+	pb.ioFVersNum = 0;
+	pb.ioFDirIndex = 0;
+	if (PBGetFInfoSync((ParmBlkPtr)&pb) == noErr) {
+		if (oflag & F_BINARY)
+			pb.ioFlFndrInfo.fdType = _ftype;
+		else
+			pb.ioFlFndrInfo.fdType = 'TEXT';
+		pb.ioFlFndrInfo.fdCreator = _fcreator;
+		PBSetFInfoSync((ParmBlkPtr)&pb);
+	}
+}
+
+
+/*
+ *  stdio_exit - stdio shutdown routine
+ *
+ */
+
+static void
+stdio_exit(void)
+{
+	register FILE *fp;
+	int n;
+	
+	for (fp = &__file[0], n = FOPEN_MAX; n--; fp++)
+		fclose(fp);
+}
+
+
+/*
+ *  fileio - I/O handler proc for files and devices
+ *
+ */
+
+static int
+fileio(FILE *fp, int i)
+{
+	IOParam pb;
+	
+	pb.ioRefNum = fp->refnum;
+	switch (i) {
+	
+				/*  read  */
+			
+		case 0:
+			pb.ioBuffer = (Ptr) fp->ptr;
+			pb.ioReqCount = fp->cnt;
+			pb.ioPosMode = fp->refnum > 0 ? fsFromStart : fsAtMark;
+			pb.ioPosOffset = fp->pos - fp->cnt;
+			PBReadSync((ParmBlkPtr)&pb);
+			if (pb.ioResult == eofErr) {
+				fp->pos = pb.ioPosOffset;
+				if (fp->cnt = pb.ioActCount)
+					pb.ioResult = 0;
+				else {
+					fp->eof = 1;
+					return(EOF);
+				}
+			}
+			if (!pb.ioResult && !fp->binary)
+				replace(fp->ptr, fp->cnt, '\r', '\n');
+			break;
+			
+				/*  write  */
+
+		case 1:
+			pb.ioBuffer = (Ptr) fp->ptr;
+			pb.ioReqCount = fp->cnt;
+			pb.ioPosMode = fp->refnum > 0 ? fsFromStart : fsAtMark;
+			if ((pb.ioPosOffset = fp->pos - fp->cnt) > fp->len) {
+				pb.ioMisc = (Ptr) pb.ioPosOffset;
+				if (PBSetEOFSync((ParmBlkPtr)&pb) != noErr)
+					break;
+			}
+			if (!fp->binary)
+				replace(fp->ptr, fp->cnt, '\n', '\r');
+			PBWriteSync((ParmBlkPtr)&pb);
+			if (!pb.ioResult && pb.ioPosOffset > fp->len)
+				fp->len = pb.ioPosOffset;
+			break;
+			
+				/*  close  */
+
+		case 2:
+			pb.ioResult = close(fp);
+			break;
+	}
+	
+		/*  done  */
+		
+	if (pb.ioResult) {
+		if (i < 2) {
+			fp->pos -= fp->cnt;
+			fp->cnt = 0;
+		}
+		fp->err = 1;
+		errno = pb.ioResult;
+		return(EOF);
+	}
+	return(0);
+}
+
+
+static int
+close(FILE *fp)
+{
+	HFileParam pb;
+	Str255 buf;
+	register char *fcb = FCBSPtr + fp->refnum;
+	VCB *vcb = fcbVPtr(fcb);
+	register char *s;
+	enum { none, MFS, HFS } del = none;
+	
+	pb.ioVRefNum = vcb->vcbVRefNum;
+	if (fp->remove) {
+		pb.ioNamePtr = buf;
+		pb.ioFVersNum = 0;
+	
+			/*  close temporary file - HFS  */
+			
+		if (vcb->vcbSigWord == 0x4244) {
+			pb.ioDirID = fcbDirID(fcb);
+			s = fcbCName(fcb);
+			memcpy(buf, s, Length(s) + 1);
+			del = HFS;
+		}
+		
+			/*  close temporary file - MFS  */
+			
+		else if (vcb->vcbSigWord == 0xD2D7) {
+			for (pb.ioFDirIndex = 1; PBGetFInfoSync((ParmBlkPtr)&pb) == noErr; pb.ioFDirIndex++) {
+				if (pb.ioFRefNum == fp->refnum) {
+					del = MFS;
+					break;
+				}
+			}
+		}
+	}
+	
+		/*  close file and flush volume buffer  */
+	
+	pb.ioFRefNum = fp->refnum;
+	if (PBCloseSync((ParmBlkPtr)&pb) == noErr) {
+		if (del == MFS)
+			PBDeleteSync((ParmBlkPtr)&pb);
+		else if (del == HFS)
+			PBHDeleteSync((HParmBlkPtr)&pb);
+		pb.ioNamePtr = 0;
+		PBFlushVolSync((ParmBlkPtr)&pb);
+	}
+	return(pb.ioResult);
+}
+
+
+/*
+ *  replace - routine for doing CR/LF conversion
+ *
+ */
+
+static void
+replace(register unsigned char *s, register size_t n, register int c1, register int c2)
+{
+#pragma options(honor_register)
+	register unsigned char *t;
+	
+	for (; n && (t = memchr(s, c1, n)); s = t) {
+		*t++ = c2;
+		n -= t - s;
+	}
+}