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