BSD 4_1c_2 release

[unix-history] / usr / src / ucb / netser / misc / rmt.c

#ifndef lint
static char sccsid[] = "@(#)rmt.c       4.3 82/05/19";
#endif

/*
* rmt
*/
#include <stdio.h>
#include <sgtty.h>
#include <sys/types.h>
#include <sys/mtio.h>
#include <errno.h>

int     tape = -1;

#define MAXRECSIZ       (10*1024)       /* small enuf for pdp-11's too */
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;
{
       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);
               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;
               goto respond;

       case 'C':
if (debug) fprintf(debug, "rmtd: C\n");
               gets(device);           /* discard */
               if (close(tape) < 0)
                       goto ioerror;
               tape = -1;
               goto respond;

       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;
               goto respond;

       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;
               goto respond;

       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) sprintf(resp, "A%d\n", rval);
               (void) write(1, resp, strlen(resp));
               (void) write(1, record, rval);
               goto top;

       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;
               }
               goto respond;

       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));
                 goto respond;
               }

       default:
if (debug) fprintf(debug, "rmtd: garbage command %c\n", c);
               exit(1);
       }
respond:
if (debug) fprintf(debug, "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;
}

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;
{

if (debug) fprintf(debug, "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));
}