+#ifndef lint
+static char sccsid[] = "@(#)rmt.c 4.1 82/04/02";
+#endif
+
+/*
+ * rmt
+ */
+#include <stdio.h>
+#include <sgtty.h>
+#include <sys/types.h>
+#include <sys/mtio.h>
+#include <errno.h>
+
+int tape = -1;
+
+#define MAXRECSIZ (60*1024)
+char record[MAXRECSIZ];
+
+#define SSIZE 64
+char device[SSIZE];
+char count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE];
+
+extern errno;
+char *sys_errlist[];
+char resp[BUFSIZ];
+
+char *sprintf();
+long lseek();
+
+FILE *debug;
+
+main(argc, argv)
+ int argc;
+ char **argv;
+{
+ long 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);
+ gets(device); gets(mode);
+if (debug) fprintf(debug, "rmtd: O %s %s\n", device, mode);
+ tape = open(device, atoi(mode));
+ if (tape < 0)
+ goto ioerror;
+ break;
+
+ case 'C':
+if (debug) fprintf(debug, "rmtd: C\n");
+ gets(device); /* discard */
+ if (close(tape) < 0)
+ goto ioerror;
+ tape = -1;
+ break;
+
+ case 'L':
+ gets(count); gets(pos);
+if (debug) fprintf(debug, "rmtd: L %s %s\n", count, pos);
+ rval = lseek(tape, (long) atoi(count), atoi(pos));
+ if (rval < 0)
+ goto ioerror;
+ break;
+
+ case 'W':
+ gets(count);
+ n = atoi(count);
+if (debug) fprintf(debug, "rmtd: W %s\n", count);
+ for (i = 0; i < n; i += cc) {
+ cc = read(0, &record[i], n - i);
+ if (cc <= 0) {
+if (debug) fprintf(debug, "rmtd: premature eof\n");
+ exit(1);
+ }
+ }
+ rval = write(tape, record, n);
+ if (rval < 0)
+ goto ioerror;
+ break;
+
+ case 'R':
+ gets(count);
+if (debug) fprintf(debug, "rmtd: R %s\n", count);
+ n = atoi(count);
+ if (n > sizeof (record))
+ n = sizeof (record);
+ rval = read(tape, record, n);
+ if (rval < 0)
+ goto ioerror;
+ (void) write(1, record, n);
+ break;
+
+ case 'I':
+ gets(op); gets(count);
+if (debug) fprintf(debug, "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;
+ }
+ break;
+
+ case 'S': /* status */
+if (debug) fprintf(debug, "rmtd: S\n");
+ { struct mtget mtget;
+ if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0)
+ goto ioerror;
+ rval = sizeof (mtget);
+ (void) write(1, (char *)&mtget, sizeof (mtget));
+ break;
+ }
+
+ default:
+if (debug) fprintf(debug, "rmtd: garbage command %c\n", c);
+ exit(1);
+ }
+ (void) sprintf(resp, "A%d\n", rval);
+ (void) write(1, resp, strlen(resp));
+ goto top;
+ioerror:
+ error(errno);
+ goto top;
+}
+
+gets(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';
+}
+
+error(num)
+ int num;
+{
+
+ (void) sprintf(resp, "E%d\n%s\n", num, sys_errlist[num]);
+ (void) write(1, resp, strlen (resp));
+}