Initial revision

src/rmt.c

@@ -0,0 +1,254 @@
+/*
+ * Copyright (c) 1983 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#ifndef lint
+char copyright[] =
+"@(#) Copyright (c) 1983 Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)rmt.c	5.4 (Berkeley) 6/29/88";
+#endif /* not lint */
+
+/* JF added #ifdef about SO_RCVBUF in attempt to make this run on more
+   machines.  Maybe it'll work */
+/*
+ * rmt
+ */
+#include <stdio.h>
+#include <sgtty.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/mtio.h>
+#include <errno.h>
+
+#if defined (i386) && defined (AIX)
+#include <fcntl.h>
+#endif
+
+int	tape = -1;
+
+char	*record;
+int	maxrecsize = -1;
+char	*checkbuf();
+
+#define	SSIZE	64
+char	device[SSIZE];
+char	count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE];
+
+extern	errno;
+extern char	*sys_errlist[];
+char	resp[BUFSIZ];
+
+long	lseek();
+
+FILE	*debug;
+#define	DEBUG(f)	if (debug) fprintf(debug, f)
+#define	DEBUG1(f,a)	if (debug) fprintf(debug, f, a)
+#define	DEBUG2(f,a1,a2)	if (debug) fprintf(debug, f, a1, a2)
+
+main(argc, argv)
+	int argc;
+	char **argv;
+{
+	int rval;
+	char c;
+	int n, i, cc;
+
+	argc--, argv++;
+	if (argc > 0) {
+		debug = fopen(*argv, "w");
+		if (debug == 0)
+			exit(1);
+		(void) setbuf(debug, (char *)0);
+	}
+top:
+	errno = 0;
+	rval = 0;
+	if (read(0, &c, 1) != 1)
+		exit(0);
+	switch (c) {
+
+	case 'O':
+		if (tape >= 0)
+			(void) close(tape);
+		getstring(device); getstring(mode);
+		DEBUG2("rmtd: O %s %s\n", device, mode);
+#if defined (i386) && defined (AIX)
+		/* This is alleged to fix a byte ordering problem. */
+		/* I'm quite suspicious if it's right. -- mib */
+		{
+		  int oflag = atoi (mode);
+		  int nflag = 0;
+		  if ((oflag & 3) == 0)
+		    nflag |= O_RDONLY;
+		  if (oflag & 1)
+		    nflag |= O_WRONLY;
+		  if (oflag & 2)
+		    nflag |= O_RDWR;
+		  if (oflag & 0x0008)
+		    nflag |= O_APPEND;
+		  if (oflag & 0x0200)
+		    nflag |= O_CREAT;
+		  if (oflag & 0x0400)
+		    nflag |= O_TRUNC;
+		  if (oflag & 0x0800)
+		    nflag |= O_EXCL;
+		  tape = open (device, nflag, 0666);
+		}
+#else		
+		tape = open(device, atoi(mode),0666);
+#endif
+		if (tape < 0)
+			goto ioerror;
+		goto respond;
+
+	case 'C':
+		DEBUG("rmtd: C\n");
+		getstring(device);		/* discard */
+		if (close(tape) < 0)
+			goto ioerror;
+		tape = -1;
+		goto respond;
+
+	case 'L':
+		getstring(count); getstring(pos);
+		DEBUG2("rmtd: L %s %s\n", count, pos);
+		rval = lseek(tape, (long) atoi(count), atoi(pos));
+		if (rval < 0)
+			goto ioerror;
+		goto respond;
+
+	case 'W':
+		getstring(count);
+		n = atoi(count);
+		DEBUG1("rmtd: W %s\n", count);
+		record = checkbuf(record, n);
+		for (i = 0; i < n; i += cc) {
+			cc = read(0, &record[i], n - i);
+			if (cc <= 0) {
+				DEBUG("rmtd: premature eof\n");
+				exit(2);
+			}
+		}
+		rval = write(tape, record, n);
+		if (rval < 0)
+			goto ioerror;
+		goto respond;
+
+	case 'R':
+		getstring(count);
+		DEBUG1("rmtd: R %s\n", count);
+		n = atoi(count);
+		record = checkbuf(record, n);
+		rval = read(tape, record, n);
+		if (rval < 0)
+			goto ioerror;
+		(void) sprintf(resp, "A%d\n", rval);
+		(void) write(1, resp, strlen(resp));
+		(void) write(1, record, rval);
+		goto top;
+
+	case 'I':
+		getstring(op); getstring(count);
+		DEBUG2("rmtd: I %s %s\n", op, count);
+		{ struct mtop mtop;
+		  mtop.mt_op = atoi(op);
+		  mtop.mt_count = atoi(count);
+		  if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0)
+			goto ioerror;
+		  rval = mtop.mt_count;
+		}
+		goto respond;
+
+	case 'S':		/* status */
+		DEBUG("rmtd: S\n");
+		{ struct mtget mtget;
+		  if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0)
+			goto ioerror;
+		  rval = sizeof (mtget);
+		  (void) sprintf(resp, "A%d\n", rval);
+		  (void) write(1, resp, strlen(resp));
+		  (void) write(1, (char *)&mtget, sizeof (mtget));
+		  goto top;
+		}
+
+	default:
+		DEBUG1("rmtd: garbage command %c\n", c);
+		exit(3);
+	}
+respond:
+	DEBUG1("rmtd: A %d\n", rval);
+	(void) sprintf(resp, "A%d\n", rval);
+	(void) write(1, resp, strlen(resp));
+	goto top;
+ioerror:
+	error(errno);
+	goto top;
+}
+
+getstring(bp)
+	char *bp;
+{
+	int i;
+	char *cp = bp;
+
+	for (i = 0; i < SSIZE; i++) {
+		if (read(0, cp+i, 1) != 1)
+			exit(0);
+		if (cp[i] == '\n')
+			break;
+	}
+	cp[i] = '\0';
+}
+
+char *
+checkbuf(record, size)
+	char *record;
+	int size;
+{
+	extern char *malloc();
+
+	if (size <= maxrecsize)
+		return (record);
+	if (record != 0)
+		free(record);
+	record = malloc(size);
+	if (record == 0) {
+		DEBUG("rmtd: cannot allocate buffer space\n");
+		exit(4);
+	}
+	maxrecsize = size;
+#ifdef SO_RCVBUF
+	while (size > 1024 &&
+	       setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
+		size -= 1024;
+#else
+	size= 1+((size-1)%1024);
+#endif
+	return (record);
+}
+
+error(num)
+	int num;
+{
+
+	DEBUG2("rmtd: E %d (%s)\n", num, sys_errlist[num]);
+	(void) sprintf(resp, "E%d\n%s\n", num, sys_errlist[num]);
+	(void) write(1, resp, strlen (resp));
+}