mirror of
https://github.com/SEPPDROID/Digital-Research-Source-Code.git
synced 2025-10-24 08:54:17 +00:00
959 lines
16 KiB
C
959 lines
16 KiB
C
static char *sccsid = "@(#)tar.c 4.5 (Berkeley) 81/04/02";
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/dir.h>
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#include <sys/mtio.h>
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#include <signal.h>
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char *sprintf();
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char *strcat();
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daddr_t bsrch();
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#define TBLOCK 512
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#define NBLOCK 20
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#define NAMSIZ 100
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union hblock {
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char dummy[TBLOCK];
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struct header {
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char name[NAMSIZ];
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char mode[8];
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char uid[8];
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char gid[8];
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char size[12];
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char mtime[12];
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char chksum[8];
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char linkflag;
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char linkname[NAMSIZ];
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} dbuf;
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} dblock, tbuf[NBLOCK];
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struct linkbuf {
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ino_t inum;
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dev_t devnum;
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int count;
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char pathname[NAMSIZ];
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struct linkbuf *nextp;
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} *ihead;
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struct stat stbuf;
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int rflag, xflag, vflag, tflag, mt, cflag, mflag, fflag, oflag, pflag;
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int term, chksum, wflag, recno, first, linkerrok;
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int freemem = 1;
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int nblock = NBLOCK;
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daddr_t low;
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daddr_t high;
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FILE *tfile;
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char tname[] = "/tmp/tarXXXXXX";
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char *usefile;
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char magtape[] = "/dev/rmt8";
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char *malloc();
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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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char *cp;
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int onintr(), onquit(), onhup(), onterm();
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if (argc < 2)
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usage();
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tfile = NULL;
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usefile = magtape;
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argv[argc] = 0;
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argv++;
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for (cp = *argv++; *cp; cp++)
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switch(*cp) {
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case 'f':
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usefile = *argv++;
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fflag++;
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break;
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case 'c':
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cflag++;
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rflag++;
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break;
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case 'o':
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oflag++;
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break;
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case 'p':
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pflag++;
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break;
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case 'u':
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mktemp(tname);
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if ((tfile = fopen(tname, "w")) == NULL) {
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fprintf(stderr, "Tar: cannot create temporary file (%s)\n", tname);
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done(1);
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}
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fprintf(tfile, "!!!!!/!/!/!/!/!/!/! 000\n");
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/* FALL THROUGH */
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case 'r':
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rflag++;
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break;
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case 'v':
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vflag++;
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break;
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case 'w':
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wflag++;
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break;
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case 'x':
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xflag++;
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break;
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case 't':
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tflag++;
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break;
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case 'm':
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mflag++;
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break;
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case '-':
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break;
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case '0':
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case '1':
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case '4':
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case '5':
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case '7':
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case '8':
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magtape[8] = *cp;
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usefile = magtape;
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break;
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case 'b':
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nblock = atoi(*argv++);
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if (nblock > NBLOCK || nblock <= 0) {
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fprintf(stderr, "Invalid blocksize. (Max %d)\n", NBLOCK);
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done(1);
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}
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break;
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case 'l':
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linkerrok++;
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break;
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default:
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fprintf(stderr, "tar: %c: unknown option\n", *cp);
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usage();
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}
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if (rflag) {
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if (cflag && tfile != NULL) {
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usage();
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done(1);
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}
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if (signal(SIGINT, SIG_IGN) != SIG_IGN)
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signal(SIGINT, onintr);
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if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
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signal(SIGHUP, onhup);
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if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
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signal(SIGQUIT, onquit);
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/*
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if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
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signal(SIGTERM, onterm);
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*/
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if (strcmp(usefile, "-") == 0) {
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if (cflag == 0) {
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fprintf(stderr, "Can only create standard output archives\n");
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done(1);
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}
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mt = dup(1);
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nblock = 1;
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}
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else if ((mt = open(usefile, 2)) < 0) {
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if (cflag == 0 || (mt = creat(usefile, 0666)) < 0) {
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fprintf(stderr, "tar: cannot open %s\n", usefile);
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done(1);
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}
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}
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dorep(argv);
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}
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else if (xflag) {
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if (strcmp(usefile, "-") == 0) {
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mt = dup(0);
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nblock = 1;
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}
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else if ((mt = open(usefile, 0)) < 0) {
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fprintf(stderr, "tar: cannot open %s\n", usefile);
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done(1);
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}
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doxtract(argv);
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}
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else if (tflag) {
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if (strcmp(usefile, "-") == 0) {
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mt = dup(0);
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nblock = 1;
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}
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else if ((mt = open(usefile, 0)) < 0) {
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fprintf(stderr, "tar: cannot open %s\n", usefile);
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done(1);
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}
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dotable();
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}
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else
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usage();
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done(0);
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}
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usage()
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{
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fprintf(stderr, "tar: usage tar -{txru}[cvfblm] [tapefile] [blocksize] file1 file2...\n");
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done(1);
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}
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dorep(argv)
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char *argv[];
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{
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register char *cp, *cp2;
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char wdir[60];
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if (!cflag) {
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getdir();
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do {
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passtape();
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if (term)
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done(0);
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getdir();
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} while (!endtape());
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if (tfile != NULL) {
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char buf[200];
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sprintf(buf, "sort +0 -1 +1nr %s -o %s; awk '$1 != prev {print; prev=$1}' %s >%sX; mv %sX %s",
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tname, tname, tname, tname, tname, tname);
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fflush(tfile);
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system(buf);
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freopen(tname, "r", tfile);
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fstat(fileno(tfile), &stbuf);
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high = stbuf.st_size;
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}
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}
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getwdir(wdir);
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while (*argv && ! term) {
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cp2 = *argv;
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if (!strcmp(cp2, "-C") && argv[1]) {
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argv++;
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if (chdir(*argv) < 0)
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perror(*argv);
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else
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getwdir(wdir);
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argv++;
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continue;
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}
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for (cp = *argv; *cp; cp++)
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if (*cp == '/')
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cp2 = cp;
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if (cp2 != *argv) {
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*cp2 = '\0';
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chdir(*argv);
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*cp2 = '/';
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cp2++;
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}
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putfile(*argv++, cp2);
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chdir(wdir);
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}
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putempty();
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putempty();
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flushtape();
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if (linkerrok == 1)
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for (; ihead != NULL; ihead = ihead->nextp)
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if (ihead->count != 0)
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fprintf(stderr, "Missing links to %s\n", ihead->pathname);
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}
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endtape()
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{
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if (dblock.dbuf.name[0] == '\0') {
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backtape();
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return(1);
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}
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else
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return(0);
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}
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getdir()
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{
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register struct stat *sp;
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int i;
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readtape( (char *) &dblock);
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if (dblock.dbuf.name[0] == '\0')
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return;
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sp = &stbuf;
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sscanf(dblock.dbuf.mode, "%o", &i);
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sp->st_mode = i;
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sscanf(dblock.dbuf.uid, "%o", &i);
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sp->st_uid = i;
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sscanf(dblock.dbuf.gid, "%o", &i);
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sp->st_gid = i;
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sscanf(dblock.dbuf.size, "%lo", &sp->st_size);
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sscanf(dblock.dbuf.mtime, "%lo", &sp->st_mtime);
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sscanf(dblock.dbuf.chksum, "%o", &chksum);
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if (chksum != checksum()) {
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fprintf(stderr, "directory checksum error\n");
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done(2);
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}
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if (tfile != NULL)
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fprintf(tfile, "%s %s\n", dblock.dbuf.name, dblock.dbuf.mtime);
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}
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passtape()
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{
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long blocks;
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char buf[TBLOCK];
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if (dblock.dbuf.linkflag == '1')
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return;
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blocks = stbuf.st_size;
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blocks += TBLOCK-1;
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blocks /= TBLOCK;
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while (blocks-- > 0)
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readtape(buf);
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}
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putfile(longname, shortname)
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char *longname;
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char *shortname;
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{
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int infile;
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long blocks;
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char buf[TBLOCK];
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register char *cp, *cp2;
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struct direct dbuf;
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int i, j;
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infile = open(shortname, 0);
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if (infile < 0) {
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fprintf(stderr, "tar: %s: cannot open file\n", longname);
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return;
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}
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fstat(infile, &stbuf);
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if (tfile != NULL && checkupdate(longname) == 0) {
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close(infile);
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return;
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}
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if (checkw('r', longname) == 0) {
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close(infile);
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return;
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}
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if ((stbuf.st_mode & S_IFMT) == S_IFDIR) {
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for (i = 0, cp = buf; *cp++ = longname[i++];);
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*--cp = '/';
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*++cp = 0 ;
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i = 0;
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if (!oflag) {
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if( (cp - buf) >= NAMSIZ) {
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fprintf(stderr, "%s: file name too long\n", longname);
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close(infile);
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return;
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}
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stbuf.st_size = 0;
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tomodes(&stbuf);
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strcpy(dblock.dbuf.name,buf);
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sprintf(dblock.dbuf.chksum, "%6o", checksum());
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writetape( (char *) &dblock);
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}
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chdir(shortname);
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while (read(infile, (char *)&dbuf, sizeof(dbuf)) > 0 && !term) {
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if (dbuf.d_ino == 0) {
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i++;
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continue;
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}
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if (strcmp(".", dbuf.d_name) == 0 || strcmp("..", dbuf.d_name) == 0) {
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i++;
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continue;
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}
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cp2 = cp;
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for (j=0; j < DIRSIZ; j++)
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*cp2++ = dbuf.d_name[j];
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*cp2 = '\0';
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close(infile);
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putfile(buf, cp);
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infile = open(".", 0);
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i++;
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lseek(infile, (long) (sizeof(dbuf) * i), 0);
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}
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close(infile);
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chdir("..");
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return;
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}
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if ((stbuf.st_mode & S_IFMT) != S_IFREG) {
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fprintf(stderr, "tar: %s is not a file. Not dumped\n", longname);
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return;
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}
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tomodes(&stbuf);
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cp2 = longname;
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for (cp = dblock.dbuf.name, i=0; (*cp++ = *cp2++) && i < NAMSIZ; i++);
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if (i >= NAMSIZ) {
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fprintf(stderr, "%s: file name too long\n", longname);
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close(infile);
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return;
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}
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if (stbuf.st_nlink > 1) {
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struct linkbuf *lp;
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int found = 0;
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for (lp = ihead; lp != NULL; lp = lp->nextp) {
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if (lp->inum == stbuf.st_ino && lp->devnum == stbuf.st_dev) {
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found++;
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break;
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}
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}
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if (found) {
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strcpy(dblock.dbuf.linkname, lp->pathname);
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dblock.dbuf.linkflag = '1';
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sprintf(dblock.dbuf.chksum, "%6o", checksum());
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writetape( (char *) &dblock);
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if (vflag) {
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fprintf(stderr, "a %s ", longname);
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fprintf(stderr, "link to %s\n", lp->pathname);
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}
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lp->count--;
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close(infile);
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return;
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}
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else {
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lp = (struct linkbuf *) malloc(sizeof(*lp));
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if (lp == NULL) {
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if (freemem) {
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fprintf(stderr, "Out of memory. Link information lost\n");
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freemem = 0;
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}
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}
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else {
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lp->nextp = ihead;
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ihead = lp;
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lp->inum = stbuf.st_ino;
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lp->devnum = stbuf.st_dev;
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lp->count = stbuf.st_nlink - 1;
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strcpy(lp->pathname, longname);
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}
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}
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}
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blocks = (stbuf.st_size + (TBLOCK-1)) / TBLOCK;
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if (vflag) {
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fprintf(stderr, "a %s ", longname);
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fprintf(stderr, "%ld blocks\n", blocks);
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}
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sprintf(dblock.dbuf.chksum, "%6o", checksum());
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writetape( (char *) &dblock);
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while ((i = read(infile, buf, TBLOCK)) > 0 && blocks > 0) {
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writetape(buf);
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blocks--;
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}
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close(infile);
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if (blocks != 0 || i != 0)
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fprintf(stderr, "%s: file changed size\n", longname);
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while (blocks-- > 0)
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putempty();
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}
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doxtract(argv)
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char *argv[];
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{
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long blocks, bytes;
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char buf[TBLOCK];
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char **cp;
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int ofile;
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for (;;) {
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getdir();
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if (endtape())
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break;
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if (*argv == 0)
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goto gotit;
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for (cp = argv; *cp; cp++)
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if (prefix(*cp, dblock.dbuf.name))
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goto gotit;
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passtape();
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continue;
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gotit:
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if (checkw('x', dblock.dbuf.name) == 0) {
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passtape();
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continue;
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}
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if(checkdir(dblock.dbuf.name))
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continue;
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if (dblock.dbuf.linkflag == '1') {
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unlink(dblock.dbuf.name);
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if (link(dblock.dbuf.linkname, dblock.dbuf.name) < 0) {
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fprintf(stderr, "%s: cannot link\n", dblock.dbuf.name);
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continue;
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}
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if (vflag)
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fprintf(stderr, "%s linked to %s\n",
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dblock.dbuf.name, dblock.dbuf.linkname);
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continue;
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}
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if ((ofile = creat(dblock.dbuf.name, stbuf.st_mode & 07777)) < 0) {
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fprintf(stderr, "tar: %s - cannot create\n", dblock.dbuf.name);
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passtape();
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continue;
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}
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chown(dblock.dbuf.name, stbuf.st_uid, stbuf.st_gid);
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blocks = ((bytes = stbuf.st_size) + TBLOCK-1)/TBLOCK;
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if (vflag)
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fprintf(stderr, "x %s, %ld bytes, %ld tape blocks\n",
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dblock.dbuf.name, bytes, blocks);
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while (blocks-- > 0) {
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readtape(buf);
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if (bytes > TBLOCK) {
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if (write(ofile, buf, TBLOCK) < 0) {
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fprintf(stderr, "tar: %s: HELP - extract write error\n", dblock.dbuf.name);
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done(2);
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}
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} else
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if (write(ofile, buf, (int) bytes) < 0) {
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fprintf(stderr, "tar: %s: HELP - extract write error\n", dblock.dbuf.name);
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done(2);
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}
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bytes -= TBLOCK;
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}
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close(ofile);
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if (mflag == 0) {
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time_t timep[2];
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timep[0] = time(NULL);
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timep[1] = stbuf.st_mtime;
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utime(dblock.dbuf.name, timep);
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}
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if (pflag)
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chmod(dblock.dbuf.name, stbuf.st_mode & 07777);
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}
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}
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dotable()
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{
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for (;;) {
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getdir();
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if (endtape())
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break;
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if (vflag)
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longt(&stbuf);
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printf("%s", dblock.dbuf.name);
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if (dblock.dbuf.linkflag == '1')
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printf(" linked to %s", dblock.dbuf.linkname);
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printf("\n");
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passtape();
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}
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}
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|
|
putempty()
|
|
{
|
|
char buf[TBLOCK];
|
|
char *cp;
|
|
|
|
for (cp = buf; cp < &buf[TBLOCK]; )
|
|
*cp++ = '\0';
|
|
writetape(buf);
|
|
}
|
|
|
|
longt(st)
|
|
register struct stat *st;
|
|
{
|
|
register char *cp;
|
|
char *ctime();
|
|
|
|
pmode(st);
|
|
printf("%3d/%1d", st->st_uid, st->st_gid);
|
|
printf("%7D", st->st_size);
|
|
cp = ctime(&st->st_mtime);
|
|
printf(" %-12.12s %-4.4s ", cp+4, cp+20);
|
|
}
|
|
|
|
#define SUID 04000
|
|
#define SGID 02000
|
|
#define ROWN 0400
|
|
#define WOWN 0200
|
|
#define XOWN 0100
|
|
#define RGRP 040
|
|
#define WGRP 020
|
|
#define XGRP 010
|
|
#define ROTH 04
|
|
#define WOTH 02
|
|
#define XOTH 01
|
|
#define STXT 01000
|
|
int m1[] = { 1, ROWN, 'r', '-' };
|
|
int m2[] = { 1, WOWN, 'w', '-' };
|
|
int m3[] = { 2, SUID, 's', XOWN, 'x', '-' };
|
|
int m4[] = { 1, RGRP, 'r', '-' };
|
|
int m5[] = { 1, WGRP, 'w', '-' };
|
|
int m6[] = { 2, SGID, 's', XGRP, 'x', '-' };
|
|
int m7[] = { 1, ROTH, 'r', '-' };
|
|
int m8[] = { 1, WOTH, 'w', '-' };
|
|
int m9[] = { 2, STXT, 't', XOTH, 'x', '-' };
|
|
|
|
int *m[] = { m1, m2, m3, m4, m5, m6, m7, m8, m9};
|
|
|
|
pmode(st)
|
|
register struct stat *st;
|
|
{
|
|
register int **mp;
|
|
|
|
for (mp = &m[0]; mp < &m[9];)
|
|
select(*mp++, st);
|
|
}
|
|
|
|
select(pairp, st)
|
|
int *pairp;
|
|
struct stat *st;
|
|
{
|
|
register int n, *ap;
|
|
|
|
ap = pairp;
|
|
n = *ap++;
|
|
while (--n>=0 && (st->st_mode&*ap++)==0)
|
|
ap++;
|
|
printf("%c", *ap);
|
|
}
|
|
|
|
checkdir(name)
|
|
register char *name;
|
|
{
|
|
register char *cp;
|
|
int i;
|
|
for (cp = name; *cp; cp++) {
|
|
if (*cp == '/') {
|
|
*cp = '\0';
|
|
if (access(name, 01) < 0) {
|
|
register int pid, rp;
|
|
|
|
if ((pid = fork()) == 0) {
|
|
execl("/bin/mkdir", "mkdir", name, 0);
|
|
execl("/usr/bin/mkdir", "mkdir", name, 0);
|
|
fprintf(stderr, "tar: cannot find mkdir!\n");
|
|
done(0);
|
|
}
|
|
while ((rp = wait(&i)) >= 0 && rp != pid)
|
|
;
|
|
chown(name, stbuf.st_uid, stbuf.st_gid);
|
|
if (pflag)
|
|
chmod(dblock.dbuf.name,
|
|
stbuf.st_mode & 0777);
|
|
}
|
|
*cp = '/';
|
|
}
|
|
}
|
|
return(cp[-1]=='/');
|
|
}
|
|
|
|
onintr()
|
|
{
|
|
signal(SIGINT, SIG_IGN);
|
|
term++;
|
|
}
|
|
|
|
onquit()
|
|
{
|
|
signal(SIGQUIT, SIG_IGN);
|
|
term++;
|
|
}
|
|
|
|
onhup()
|
|
{
|
|
signal(SIGHUP, SIG_IGN);
|
|
term++;
|
|
}
|
|
|
|
onterm()
|
|
{
|
|
signal(SIGTERM, SIG_IGN);
|
|
term++;
|
|
}
|
|
|
|
tomodes(sp)
|
|
register struct stat *sp;
|
|
{
|
|
register char *cp;
|
|
|
|
for (cp = dblock.dummy; cp < &dblock.dummy[TBLOCK]; cp++)
|
|
*cp = '\0';
|
|
sprintf(dblock.dbuf.mode, "%6o ", sp->st_mode & 07777);
|
|
sprintf(dblock.dbuf.uid, "%6o ", sp->st_uid);
|
|
sprintf(dblock.dbuf.gid, "%6o ", sp->st_gid);
|
|
sprintf(dblock.dbuf.size, "%11lo ", sp->st_size);
|
|
sprintf(dblock.dbuf.mtime, "%11lo ", sp->st_mtime);
|
|
}
|
|
|
|
checksum()
|
|
{
|
|
register i;
|
|
register char *cp;
|
|
|
|
for (cp = dblock.dbuf.chksum; cp < &dblock.dbuf.chksum[sizeof(dblock.dbuf.chksum)]; cp++)
|
|
*cp = ' ';
|
|
i = 0;
|
|
for (cp = dblock.dummy; cp < &dblock.dummy[TBLOCK]; cp++)
|
|
i += *cp;
|
|
return(i);
|
|
}
|
|
|
|
checkw(c, name)
|
|
char *name;
|
|
{
|
|
if (wflag) {
|
|
printf("%c ", c);
|
|
if (vflag)
|
|
longt(&stbuf);
|
|
printf("%s: ", name);
|
|
if (response() == 'y'){
|
|
return(1);
|
|
}
|
|
return(0);
|
|
}
|
|
return(1);
|
|
}
|
|
|
|
response()
|
|
{
|
|
char c;
|
|
|
|
c = getchar();
|
|
if (c != '\n')
|
|
while (getchar() != '\n');
|
|
else c = 'n';
|
|
return(c);
|
|
}
|
|
|
|
checkupdate(arg)
|
|
char *arg;
|
|
{
|
|
char name[100];
|
|
long mtime;
|
|
daddr_t seekp;
|
|
daddr_t lookup();
|
|
|
|
rewind(tfile);
|
|
for (;;) {
|
|
if ((seekp = lookup(arg)) < 0)
|
|
return(1);
|
|
fseek(tfile, seekp, 0);
|
|
fscanf(tfile, "%s %lo", name, &mtime);
|
|
if (stbuf.st_mtime > mtime)
|
|
return(1);
|
|
else
|
|
return(0);
|
|
}
|
|
}
|
|
|
|
done(n)
|
|
{
|
|
unlink(tname);
|
|
exit(n);
|
|
}
|
|
|
|
prefix(s1, s2)
|
|
register char *s1, *s2;
|
|
{
|
|
while (*s1)
|
|
if (*s1++ != *s2++)
|
|
return(0);
|
|
if (*s2)
|
|
return(*s2 == '/');
|
|
return(1);
|
|
}
|
|
|
|
getwdir(s)
|
|
char *s;
|
|
{
|
|
int i;
|
|
int pipdes[2];
|
|
|
|
pipe(pipdes);
|
|
if ((i = fork()) == 0) {
|
|
close(1);
|
|
dup(pipdes[1]);
|
|
execl("/bin/pwd", "pwd", 0);
|
|
execl("/usr/bin/pwd", "pwd", 0);
|
|
fprintf(stderr, "pwd failed!\n");
|
|
printf("/\n");
|
|
exit(1);
|
|
}
|
|
while (wait((int *)NULL) != -1)
|
|
;
|
|
read(pipdes[0], s, 50);
|
|
while(*s != '\n')
|
|
s++;
|
|
*s = '\0';
|
|
close(pipdes[0]);
|
|
close(pipdes[1]);
|
|
}
|
|
|
|
#define N 200
|
|
int njab;
|
|
daddr_t
|
|
lookup(s)
|
|
char *s;
|
|
{
|
|
register i;
|
|
daddr_t a;
|
|
|
|
for(i=0; s[i]; i++)
|
|
if(s[i] == ' ')
|
|
break;
|
|
a = bsrch(s, i, low, high);
|
|
return(a);
|
|
}
|
|
|
|
daddr_t
|
|
bsrch(s, n, l, h)
|
|
daddr_t l, h;
|
|
char *s;
|
|
{
|
|
register i, j;
|
|
char b[N];
|
|
daddr_t m, m1;
|
|
|
|
njab = 0;
|
|
|
|
loop:
|
|
if(l >= h)
|
|
return(-1L);
|
|
m = l + (h-l)/2 - N/2;
|
|
if(m < l)
|
|
m = l;
|
|
fseek(tfile, m, 0);
|
|
fread(b, 1, N, tfile);
|
|
njab++;
|
|
for(i=0; i<N; i++) {
|
|
if(b[i] == '\n')
|
|
break;
|
|
m++;
|
|
}
|
|
if(m >= h)
|
|
return(-1L);
|
|
m1 = m;
|
|
j = i;
|
|
for(i++; i<N; i++) {
|
|
m1++;
|
|
if(b[i] == '\n')
|
|
break;
|
|
}
|
|
i = cmp(b+j, s, n);
|
|
if(i < 0) {
|
|
h = m;
|
|
goto loop;
|
|
}
|
|
if(i > 0) {
|
|
l = m1;
|
|
goto loop;
|
|
}
|
|
return(m);
|
|
}
|
|
|
|
cmp(b, s, n)
|
|
char *b, *s;
|
|
{
|
|
register i;
|
|
|
|
if(b[0] != '\n')
|
|
exit(2);
|
|
for(i=0; i<n; i++) {
|
|
if(b[i+1] > s[i])
|
|
return(-1);
|
|
if(b[i+1] < s[i])
|
|
return(1);
|
|
}
|
|
return(b[i+1] == ' '? 0 : -1);
|
|
}
|
|
|
|
readtape(buffer)
|
|
char *buffer;
|
|
{
|
|
register int i;
|
|
|
|
if (recno >= nblock || first == 0) {
|
|
if ((i = read(mt, tbuf, TBLOCK*nblock)) < 0) {
|
|
fprintf(stderr, "Tar: tape read error\n");
|
|
done(3);
|
|
}
|
|
if (first == 0) {
|
|
if ((i % TBLOCK) != 0) {
|
|
fprintf(stderr, "Tar: tape blocksize error\n");
|
|
done(3);
|
|
}
|
|
i /= TBLOCK;
|
|
if (i != nblock) {
|
|
fprintf(stderr, "Tar: blocksize = %d\n", i);
|
|
nblock = i;
|
|
}
|
|
}
|
|
recno = 0;
|
|
}
|
|
first = 1;
|
|
copy(buffer, &tbuf[recno++]);
|
|
return(TBLOCK);
|
|
}
|
|
|
|
writetape(buffer)
|
|
char *buffer;
|
|
{
|
|
first = 1;
|
|
if (recno >= nblock) {
|
|
if (write(mt, tbuf, TBLOCK*nblock) < 0) {
|
|
fprintf(stderr, "Tar: tape write error\n");
|
|
done(2);
|
|
}
|
|
recno = 0;
|
|
}
|
|
copy(&tbuf[recno++], buffer);
|
|
if (recno >= nblock) {
|
|
if (write(mt, tbuf, TBLOCK*nblock) < 0) {
|
|
fprintf(stderr, "Tar: tape write error\n");
|
|
done(2);
|
|
}
|
|
recno = 0;
|
|
}
|
|
return(TBLOCK);
|
|
}
|
|
|
|
backtape()
|
|
{
|
|
static int mtdev = 1;
|
|
static struct mtop mtop = {MTBSR, 1};
|
|
struct mtget mtget;
|
|
|
|
if (mtdev == 1)
|
|
mtdev = ioctl(mt, MTIOCGET, &mtget);
|
|
if (mtdev == 0) {
|
|
if (ioctl(mt, MTIOCTOP, &mtop) < 0) {
|
|
fprintf(stderr, "Tar: tape backspace error\n");
|
|
done(4);
|
|
}
|
|
} else
|
|
lseek(mt, (long) -TBLOCK*nblock, 1);
|
|
recno--;
|
|
}
|
|
|
|
flushtape()
|
|
{
|
|
write(mt, tbuf, TBLOCK*nblock);
|
|
}
|
|
|
|
copy(to, from)
|
|
register char *to, *from;
|
|
{
|
|
register i;
|
|
|
|
i = TBLOCK;
|
|
do {
|
|
*to++ = *from++;
|
|
} while (--i);
|
|
}
|