+/*
+ * Copyright (c) 1983 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#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 5.6 (Berkeley) 6/1/90";
+#endif /* not lint */
+
+/*
+ * rmt
+ */
+#include <stdio.h>
+#include <sgtty.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/mtio.h>
+#include <errno.h>
+#include <string.h>
+
+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];
+
+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);
+ tape = open(device, atoi(mode));
+ 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;
+ while (size > 1024 &&
+ setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
+ size -= 1024;
+ return (record);
+}
+
+error(num)
+ int num;
+{
+
+ DEBUG2("rmtd: E %d (%s)\n", num, strerror(num));
+ (void) sprintf(resp, "E%d\n%s\n", num, strerror(num));
+ (void) write(1, resp, strlen(resp));
+}
projects / unix-history / commitdiff