]> Dogcows Code - chaz/tar/commitdiff
Initial revision
authorFrançois Pinard <pinard@iro.umontreal.ca>
Wed, 16 Nov 1994 02:45:20 +0000 (02:45 +0000)
committerFrançois Pinard <pinard@iro.umontreal.ca>
Wed, 16 Nov 1994 02:45:20 +0000 (02:45 +0000)
src/rmt.c [new file with mode: 0644]

diff --git a/src/rmt.c b/src/rmt.c
new file mode 100644 (file)
index 0000000..b44a8d3
--- /dev/null
+++ b/src/rmt.c
@@ -0,0 +1,254 @@
+/*
+ * 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 */
+
+/* JF added #ifdef about SO_RCVBUF in attempt to make this run on more
+   machines.  Maybe it'll work */
+/*
+ * rmt
+ */
+#include <stdio.h>
+#include <sgtty.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/mtio.h>
+#include <errno.h>
+
+#if defined (i386) && defined (AIX)
+#include <fcntl.h>
+#endif
+
+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;
+extern 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);
+#if defined (i386) && defined (AIX)
+               /* This is alleged to fix a byte ordering problem. */
+               /* I'm quite suspicious if it's right. -- mib */
+               {
+                 int oflag = atoi (mode);
+                 int nflag = 0;
+                 if ((oflag & 3) == 0)
+                   nflag |= O_RDONLY;
+                 if (oflag & 1)
+                   nflag |= O_WRONLY;
+                 if (oflag & 2)
+                   nflag |= O_RDWR;
+                 if (oflag & 0x0008)
+                   nflag |= O_APPEND;
+                 if (oflag & 0x0200)
+                   nflag |= O_CREAT;
+                 if (oflag & 0x0400)
+                   nflag |= O_TRUNC;
+                 if (oflag & 0x0800)
+                   nflag |= O_EXCL;
+                 tape = open (device, nflag, 0666);
+               }
+#else          
+               tape = open(device, atoi(mode),0666);
+#endif
+               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;
+#ifdef SO_RCVBUF
+       while (size > 1024 &&
+              setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
+               size -= 1024;
+#else
+       size= 1+((size-1)%1024);
+#endif
+       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));
+}
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