BSD 4_3_Tahoe release

[unix-history] / usr / src / etc / rmt.c

/*
* 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 */

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

extern  errno;
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);
               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, sys_errlist[num]);
       (void) sprintf(resp, "E%d\n%s\n", num, sys_errlist[num]);
       (void) write(1, resp, strlen (resp));
}