From 86e5f36943a5dc188b950497ac1f8ba381941e6c Mon Sep 17 00:00:00 2001 From: Lars Brinkhoff Date: Mon, 24 Oct 2016 19:52:38 +0200 Subject: [PATCH] Import version 0.4 from http://www.brouhaha.com/~eric/software/tapeutils/ --- COPYING | 339 ++++++++++++++++++++++++++++ Makefile | 67 ++++++ tapecopy.c | 177 +++++++++++++++ tapedump.c | 187 +++++++++++++++ tapeio.c | 649 +++++++++++++++++++++++++++++++++++++++++++++++++++++ tapeio.h | 53 +++++ 6 files changed, 1472 insertions(+) create mode 100644 COPYING create mode 100644 Makefile create mode 100644 tapecopy.c create mode 100644 tapedump.c create mode 100644 tapeio.c create mode 100644 tapeio.h diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..6977e4f --- /dev/null +++ b/COPYING @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc. + 675 Mass Ave, Cambridge, MA 02139, USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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If this is what you want to do, use the GNU Library General +Public License instead of this License. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..b69a911 --- /dev/null +++ b/Makefile @@ -0,0 +1,67 @@ +# Makefile for tapeutils +# Copyright 1998, 1999, 2000 Eric Smith +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License version 2 as published +# by the Free Software Foundation. Note that permission is not granted +# to redistribute this program under the terms of any later version of the +# General Public License. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + +# ----------------------------------------------------------------------------- +# options +# ----------------------------------------------------------------------------- + +CFLAGS = -O2 +LDFLAGS = + +# CFLAGS = -g +# LDFLAGS = -g + +# ----------------------------------------------------------------------------- +# You shouldn't have to change anything below this point, but if you do please +# let me know why so I can improve this Makefile. +# ----------------------------------------------------------------------------- + +PACKAGE = tapeutils +VERSION = 0.4 +DSTNAME = $(PACKAGE)-$(VERSION) + +PROGRAMS = tapecopy tapedump + +HEADERS = tapeio.h +SOURCES = tapeio.c tapecopy.c tapedump.c +MISC = COPYING + +DISTFILES = $(MISC) Makefile $(HEADERS) $(SOURCES) + +all: $(PROGRAMS) $(MISC_TARGETS) + +dist: $(DISTFILES) + -rm -rf $(DSTNAME) + mkdir $(DSTNAME) + for f in $(DISTFILES); do ln $$f $(DSTNAME)/$$f; done + tar --gzip -chf $(DSTNAME).tar.gz $(DSTNAME) + -rm -rf $(DSTNAME) + +clean: + rm -f $(PROGRAMS) $(MISC_TARGETS) *.o + + +tapecopy: tapecopy.o tapeio.o + +tapedump: tapedump.o tapeio.o + + +include $(SOURCES:.c=.d) + +%.d: %.c + $(CC) -M -MG $(CFLAGS) $< | sed -e 's@ /[^ ]*@@g' -e 's@^\(.*\)\.o:@\1.d \1.o:@' > $@ diff --git a/tapecopy.c b/tapecopy.c new file mode 100644 index 0000000..843a132 --- /dev/null +++ b/tapecopy.c @@ -0,0 +1,177 @@ +/* + tapecopy + + This program uses a modified version of John Wilson's tapeio library to + copy tapes between any of the following: + + local tape drives - pathname starting with /dev/ + remote tape drives (rmt) - pathname containing a colon + Wilson-format tape image files - any other pathname + + Copyright 1999, 2000 Eric Smith + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License version 2 as published + by the Free Software Foundation. Note that permission is not granted + to redistribute this program under the terms of any other version of the + General Public License. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "tapeio.h" +#include "stdio.h" +#include "stdarg.h" + +#define MAX_REC_LEN 32768 + +char *progname; + +char *buf; + +void print_usage (FILE *f) +{ + fprintf (f, "Usage: %s [-v] in out\n", progname); +} + +void fatal (int retval, char *fmt, ...) +{ + va_list ap; + + if (fmt) + { + fprintf (stderr, "%s: ", progname); + va_start (ap, fmt); + vfprintf (stderr, fmt, ap); + va_end (ap); + } + + if (retval == 1) + print_usage (stderr); + + exit (retval); +} + +int main (int argc, char *argv[]) +{ + int file = 0; + unsigned long filebytes = 0; + unsigned long tapebytes = 0; + int prevlen = -2; + int lencount = 0; + int firstrec = 0; + int len; + int verbose = 0; + char *srcfn = NULL; + char *destfn = NULL; + tape_handle src = NULL; + tape_handle dest = NULL; + + progname = argv [0]; + + while (++argv, --argc) + { + if ((argv [0][0] == '-') && (argv [0][1] != '\0')) + { + if (argv [0][1] == 'v') + verbose++; + else + fatal (1, "unrecognized option '%s'\n", argv [0]); + } + else if (! srcfn) + srcfn = argv [0]; + else if (! destfn) + destfn = argv [0]; + else + fatal (1, NULL); + } + + if (! srcfn) + fatal (1, NULL); + + buf = (char *) malloc (MAX_REC_LEN); + if (! buf) + fatal (2, "can't allocate buffer\n"); + + src = opentape (srcfn, 0, 0); + if (! src) + fatal (3, "can't open source tape\n"); + + if (destfn) + { + dest = opentape (destfn, 1, 1); + if (! dest) + fatal (4, "can't open dest tape\n"); + } + else + verbose++; + + for (;;) + { + len = getrec (src, buf, MAX_REC_LEN); + if ((lencount != 0) && ((len == 0) || (len != prevlen))) + { + if (verbose) + { + if (lencount == 1) + printf ("1 record (%d)\n", firstrec); + else + printf ("%d records (%d..%d)\n", lencount, firstrec, + firstrec+lencount-1); + fflush (stdout); + } + filebytes += prevlen * lencount; + firstrec += lencount; + prevlen = -1; + lencount = 0; + } + if (len != 0) + { + if (lencount == 0) + { + if (verbose) + { + printf ("file %d record length %d: ", file, len); + fflush (stdout); + } + } + if (destfn) + putrec (dest, buf, len); + lencount++; + } + else + { + tapebytes += filebytes; + if (verbose) + { + if (prevlen == 0) + printf ("end of tape, %lu total bytes\n", tapebytes); + else + printf ("end of file %d, %lu bytes\n", file, filebytes); + fflush (stdout); + } + if (destfn) + tapemark (dest); + if (prevlen == 0) + break; + file++; + lencount = 0; + firstrec = 0; + filebytes = 0; + } + prevlen = len; + } + + closetape (src); + if (destfn) + closetape (dest); + + return (0); +} diff --git a/tapedump.c b/tapedump.c new file mode 100644 index 0000000..3c6cc36 --- /dev/null +++ b/tapedump.c @@ -0,0 +1,187 @@ +/* + tapedump + + This program uses a modified version of John Wilson's tapeio library to + copy tapes between any of the following: + + local tape drives - pathname starting with /dev/ + remote tape drives (rmt) - pathname containing a colon + Wilson-format tape image files - any other pathname + + Copyright 1999, 2000 Eric Smith + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License version 2 as published + by the Free Software Foundation. Note that permission is not granted + to redistribute this program under the terms of any other version of the + General Public License. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "tapeio.h" +#include "stdio.h" +#include "stdarg.h" + +#define MAX_REC_LEN 32768 + +char *progname; + +void print_usage (FILE *f) +{ + fprintf (f, "Usage: %s in\n", progname); +} + +void fatal (int retval, char *fmt, ...) +{ + va_list ap; + + if (fmt) + { + fprintf (stderr, "%s: ", progname); + va_start (ap, fmt); + vfprintf (stderr, fmt, ap); + va_end (ap); + } + + if (retval == 1) + print_usage (stderr); + + exit (retval); +} + + +#define BYTES_PER_LINE 16 + +void dump (FILE *f, char *buf, int len) +{ + int i, j; + + for (i = 0; i < len; i += BYTES_PER_LINE) + { + fprintf (f, " %04x: ", i); + for (j = 0; j < BYTES_PER_LINE; j++) + if ((i + j) < len) + fprintf (f, "%02x ", 0xff & buf [i+j]); + else + fprintf (f, " "); + for (j = 0; j < BYTES_PER_LINE; j++) + if ((i + j) < len) + { + char c = buf [i+j] & 0x7f; + if ((buf [i+j] >= ' ') && (buf [i+j] <= '~')) + fprintf (f, "%c", buf [i+j]); + else + fprintf (f, "."); + } + else + fprintf (f, " "); + fprintf (f, "\n"); + } +} + + +#ifdef HP_2000_SUPPORT + +#define MAX_FN_LEN 6 + +void dump_hp_2000_file_header (FILE *f, char *buf) +{ + unsigned long uid; + char uids [6]; + char filename [MAX_FN_LEN + 1]; + int i; + uid = ((buf [0] & 0xff) << 8) | (buf [1] & 0xff); + uids [0] = (uid / 1024) + '@'; + sprintf (& uids [1], "%03d", uid & 0x3ff); + for (i = 0; i < MAX_FN_LEN; i++) + filename [i] = buf [i+2] & 0x7f; + filename [sizeof (filename) - 1] = '\0'; + fprintf (f, " id %s filename '%s'\n", uids, filename); +} + +#endif /* HP_2000_SUPPORT */ + +int main (int argc, char *argv[]) +{ + int file = 0; + int record = 0; + unsigned long filebytes = 0; + unsigned long tapebytes = 0; + int len; + char *srcfn = NULL; + tape_handle src = NULL; + char *buf; +#ifdef HP_2000_SUPPORT + int hp_2000_hibernate = 0; +#endif /* HP_2000_SUPPORT */ + + progname = argv [0]; + + while (++argv, --argc) + { + if ((argv [0][0] == '-') && (argv [0][1] != '\0')) + { +#ifdef HP_2000_SUPPORT + if (argv [0][1] == 'h') + hp_2000_hibernate++; + else +#endif /* HP_2000_SUPPORT */ + fatal (1, "unrecognized option '%s'\n", argv [0]); + } + else if (! srcfn) + srcfn = argv [0]; + else + fatal (1, NULL); + } + + if (! srcfn) + fatal (1, NULL); + + buf = (char *) malloc (MAX_REC_LEN); + if (! buf) + fatal (2, "can't allocate buffer\n"); + + src = opentape (srcfn, 0, 0); + if (! src) + fatal (3, "can't open source tape\n"); + + for (;;) + { + len = getrec (src, buf, MAX_REC_LEN); + if (len == 0) + { + printf ("total length of file %d = %d records, %d bytes\n", + file, record, filebytes); + tapebytes += filebytes; + file++; + record = 0; + filebytes = 0; + printf ("start of file %d\n", file); + fflush (stdout); + } + else + { + printf ("file %d record %d: length %d\n", file, record, len); +#ifdef HP_2000_SUPPORT + if (hp_2000_hibernate && (file > 0) && (record == 0) && (len >= 24)) + dump_hp_2000_file_header (stdout, buf); +#endif /* HP_2000_SUPPORT */ + dump (stdout, buf, len); + fflush (stdout); + filebytes += len; + record++; + } + } + + closetape (src); + + return (0); +} diff --git a/tapeio.c b/tapeio.c new file mode 100644 index 0000000..05cc416 --- /dev/null +++ b/tapeio.c @@ -0,0 +1,649 @@ +/* + Routines to do magtape I/O to local tapes, remote tapes, and tape image + files. + + Copyright 1998, 1999 John Wilson and Eric Smith + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License version 2 as published + by the Free Software Foundation. Note that permission is not granted + to redistribute this program under the terms of any other version of the + General Public License. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + 08/10/93 JMBW IBM mainframe TCP socket stuff (was using many files). + 07/08/94 JMBW Local magtape code. + 03/13/95 JMBW Converted to separate routines. + 07/19/98 JMBW Added support for "rmt" remote tape protocol. + 11/16/98 ELS Provide struct for per-instance variables. + 02/06/98 ELS Reorganization, and added skiprec and skipfile. +*/ + + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include /* for lseek() SEEK_SET, SEEK_END under Linux */ +#include + +#ifdef _AIX /* maybe this will be enough to make it compile on AIX */ +#include +#define MTWEOF STWEOF +#define MTREW STREW +#define MTFSR STFSR +#define MTFSF STFSF +#define MTBSR STRSR +#define MTIOCTOP STIOCTOP +/* not sure about these two (SCSI only): */ +#define MTSETBLK STSETBLK +#define MTSETDENSITY STSETDENSITY +#define mtop stop +#else +#include +#endif + +#include "tapeio.h" + + +#define TT_UNK 0 +#define TT_TAPE 1 /* honest to god tape drive */ +#define TT_IMAGE 2 /* file containing image of a tape */ +#define TT_RMT 3 /* rmt tape server */ + + +struct mtape_t +{ + int tape_type; + int tapefd; /* tape drive, file, or socket file descriptor */ + int seek_ok; + + unsigned long bpi; /* tape density (for tape length msg) */ + int waccess; /* NZ => tape opened for write access access */ + unsigned long count; /* count of frames written to tape */ + + char netbuf[80]; /* buffer for net commands and responses */ +}; + + +#ifndef O_BINARY +#define O_BINARY 0 +#endif + +/* default tape drive device name */ +#define TAPE "/dev/nst0" +/* default tape density */ +#define BPI 1600 + + +/* magtape commands */ +static struct mtop mt_weof={ MTWEOF, 1 }; /* operation, count */ +static struct mtop mt_rew={ MTREW, 1 }; +static struct mtop mt_fsr={ MTFSR, 1 }; +static struct mtop mt_fsf={ MTFSF, 1 }; +static struct mtop mt_bsr={ MTBSR, 1 }; +/* SCSI only: */ +static struct mtop mt_setblk={ MTSETBLK, 0 }; /* blockize = 0 (variable) */ +static struct mtop mt_setden={ MTSETDENSITY, 0x02 }; /* density = 1600 */ + + +#define FAIL(msg) do { fprintf (stderr, msg); goto fail; } while (0) + + +/* do a write and check the return status, punt on error */ +static void dowrite (int handle, char *buf, int len) +{ + if (write (handle, buf, len) != len) + { + perror ("?Error on write"); + exit (1); + } +} + + +/* do a read and keep trying until we get all bytes */ +static void doread (int handle, char *buf, int len) +{ + int n; + while(len) + { + if ((n = read (handle, buf, len)) < 0) + { + perror("?Error on read"); + exit (1); + } + if (n == 0) + { + fprintf (stderr, "?Unexpected end of file\n"); + exit (1); + } + buf += n; + len -= n; + } +} + + +/* get response from "rmt" server */ +static int response (tape_handle mtape) +{ + char c, rc; + int n; + + doread (mtape->tapefd, &rc, 1); /* get success/error code */ + if (rc != 'A' && rc != 'E') + { /* must be Acknowledge or Error */ + fprintf (stderr, "?Invalid rmt response code: %c\n",rc); + exit (1); + } + + /* get numeric value (returned by both A and E responses) */ + for (n=0;;) + { + doread (mtape->tapefd, &c, 1); /* get next digit */ + if (c < '0' || c > '9') + break; /* not a digit */ + n = n * 10 + (c - '0'); /* add new digit in */ + /* ideally would check for overflow */ + } + if (c != '\n') + { /* first non-digit char must be */ + fprintf (stderr, "?Invalid rmt response terminator: %3.3o\n", + ((int) c) & 0377); + exit (1); + } + if (rc == 'A') + return (n); /* success, return value >=0 */ + /* (unless overflowed) */ + do + doread (mtape->tapefd, &c, 1); + while (c != '\n'); /* ignore until next LF */ + errno = n; /* set error number */ + return (-1); +} + + +/* send ioctl() command to local or remote tape drive */ +static int doioctl (tape_handle mtape, struct mtop *op) +{ + int len; + + if (mtape->tape_type == TT_TAPE) + return (ioctl (mtape->tapefd, MTIOCTOP, op)); + else + { /* "rmt" tape server */ + /* form cmd (better hope remote MT_OP values are the same) */ + len = sprintf (mtape->netbuf, "I%d\n%d\n", op->mt_op, op->mt_count); + dowrite (mtape->tapefd, mtape->netbuf, len); + return (response (mtape)); + } +} + + +/* open the tape drive (or whatever) */ +/* "create" =1 to create if file, "writable" =1 to open with write access */ +tape_handle opentape (char *name, int create, int writable) +{ + char *p, *user, *port; + int len; + char *host = NULL; + + tape_handle mtape = NULL; + + mtape = (tape_handle) calloc (1, sizeof (struct mtape_t)); + if (! mtape) + FAIL ("?can't allocate mtape struct\n"); + + mtape->bpi = BPI; + + mtape->waccess = writable; /* remember if we're writing */ + mtape->count = 0; /* nothing transferred yet */ + + /* get tape filename */ + if (name == NULL) + name = getenv("TAPE"); /* get from environment */ + if (name == NULL) + name = TAPE; /* or use our default */ + + /* just a file if no colon in filename */ + if ((p = index (name, ':')) == NULL) + { + /* there's probably a better way to handle this, in case a file is really + a link to a tape drive -- handler index or something? */ + if (strncmp (name, "/dev/", 5) == 0) + { + /* assume tape if starts with /dev/ */ + mtape->tape_type = TT_TAPE; + mtape->tapefd = open (name, (writable ? O_RDWR : O_RDONLY), 0); + } + else + { /* otherwise file */ + mtape->tape_type = TT_IMAGE; + if (strcmp (name, "-") ==0 ) + { /* stdin/stdout */ + if (writable) + mtape->tapefd=1; + else + mtape->tapefd=0; + } + else + { + if (create) + mtape->tapefd = open (name, O_CREAT | O_TRUNC | + O_WRONLY | O_BINARY, 0644); + else + { + mtape->tapefd = open (name, (writable ? O_RDWR : O_RDONLY) | + O_BINARY, 0); + mtape->seek_ok = 1; + } + } + } + if (mtape->tapefd < 0) + FAIL ("?can't open device or file\n"); + } + else + { /* "rmt" tape server on remote host */ + mtape->tape_type = TT_RMT; + /* split filename around ':' */ + len = p-name; + port = p+1; + + /* can't necessarily modify tape[] so copy it first */ + if ((host = malloc (len + 1)) == NULL) + FAIL ("?can't allocate string for hostname\n"); + strncpy (host, name, len); /* copy hostname */ + host [len] = 0; /* tack on null */ + + /* connect to "rexec" server */ + if ((p = index (host, '@')) == NULL) + { + p = host; /* no @, point at hostname */ + user = NULL; + } + else + { + *p++ = '\0'; /* shoot out @, point at host name */ + user = (*p != '\0') ? host : NULL; /* keep non-null user */ + } + if ((mtape->tapefd = rexec (&p, htons (512), user, NULL, "/etc/rmt", + (int *) NULL)) < 0) + FAIL ("?Connection failed\n"); + + /* build rmt "open device" command */ + if ((1 + strlen (port) + 1 + 1 + 1 + 1) > sizeof (mtape->netbuf)) + FAIL ("?Device name too long\n"); + len = sprintf (mtape->netbuf, "O%s\n%d\n", port, writable ? O_RDWR : O_RDONLY); + dowrite (mtape->tapefd, mtape->netbuf, len); + if (response (mtape) < 0) + FAIL ("?Error opening tape drive"); + } + + /* SCSI setup for local/remote tape drive */ + if ((mtape->tape_type == TT_TAPE) || + (mtape->tape_type == TT_RMT)) + { + /* (ignore errors in case not SCSI) */ + /* set variable record length mode */ + doioctl (mtape, & mt_setblk); + /* set density to 1600 */ + doioctl (mtape, & mt_setden); + } + + if (host) + free (host); + + return (mtape); + + fail: + if (mtape) + { + if (host) + free (host); + free (mtape); + } + return (NULL); +} + + +/* close the tape drive */ +void closetape (tape_handle mtape) +{ + if (mtape->waccess) + { /* opened for create/append */ + tapemark (mtape); /* add one more tape mark */ + /* (should have one already) */ + } + if (mtape->tape_type == TT_RMT) + { + dowrite (mtape->tapefd, "C\n", 2); + if (response (mtape) < 0) + { + perror("?Error closing remote tape"); + exit(1); + } + } + if (close (mtape->tapefd) < 0) + { + perror("?Error closing tape"); + exit(1); + } + free (mtape); +} + + +/* rewind tape */ +void posnbot (tape_handle mtape) +{ + if (mtape->tape_type == TT_IMAGE) + { /* image file */ + if (lseek (mtape->tapefd, 0L, SEEK_SET) < 0) + { + perror("?Seek failed"); + exit(1); + } + } + else + { /* local/remote tape drive */ + if (doioctl (mtape, & mt_rew) < 0) + { + perror("?Rewind failed"); + exit(1); + } + } +} + + +/* position tape at EOT (between the two tape marks) */ +void posneot (tape_handle mtape) +{ + if (mtape->tape_type == TT_IMAGE) + { /* image file */ + if (lseek (mtape->tapefd, -4L, SEEK_END) < 0) + { + perror("?Seek failed"); + exit(1); + } + } + else + { /* local/remote tape drive */ + doioctl (mtape, & mt_bsr); /* in case already at LEOT */ + while (1) + { + /* space forward a file */ + if (doioctl (mtape, & mt_fsf) < 0) + { + perror("?Error spacing to EOT"); + exit(1); + } + /* space one record more to see if double EOF */ + if (doioctl (mtape, & mt_fsr) < 0) + break; +/* might want to check errno to make sure it's the right error */ + } +#if 1 + /* "man mtio" doesn't say whether MTFSR actually moves past */ + /* the tape mark, let's assume it does */ + if (doioctl (mtape, & mt_bsr) < 0) + { /* get between them */ + perror("?Error backspacing at EOT"); + exit(1); + } +#endif + } +} + + +/* read a tape record, return actual length (0=tape mark) */ +int getrec (tape_handle mtape, char *buf, int len) +{ + unsigned char byte [4]; /* 32 bits for length field(s) */ + unsigned long l; /* at least 32 bits */ + + if (mtape->tape_type == TT_IMAGE) + { /* image file */ + doread (mtape->tapefd, byte, 4); /* get record length */ + l=((unsigned long)byte[3]<<24L)|((unsigned long)byte[2]<<16L)| + ((unsigned long)byte[1]<<8L)|(unsigned long)byte[0]; + /* compose into longword */ + if (l > len) + goto toolong; /* don't read if too long for buf */ + if (l != 0) + { /* get data unless tape mark */ + doread (mtape->tapefd, buf, l); /* read data */ + doread (mtape->tapefd, byte, 4); /* get trailing record length */ + if((((unsigned long)byte[3]<<24L)| + ((unsigned long)byte[2]<<16L)| + ((unsigned long)byte[1]<<8)| + (unsigned long)byte[0])!=l) + { /* should match */ + fprintf (stderr,"?Corrupt tape image\n"); + exit(1); + } + } + } + else if (mtape->tape_type == TT_RMT) + { /* rmt tape server */ + len = sprintf (mtape->netbuf, "R%d\n", len); + dowrite (mtape->tapefd, mtape->netbuf, len); + if ((l = response (mtape)) < 0) + { + perror("?Error reading tape"); + exit(1); + } + if (l) + doread (mtape->tapefd, buf, l); + } + else + { /* local tape drive */ + if ((l = read (mtape->tapefd, buf, len)) < 0) + { + perror("?Error reading tape"); + exit(1); + } + } + return(l); + + toolong: + fprintf(stderr,"?%ld byte tape record too long for %d byte buffer\n", + l,len); + exit(1); +} + + +/* write a tape record */ +void putrec (tape_handle mtape, char *buf, int len) +{ + unsigned char l [4]; + + if (mtape->tape_type == TT_IMAGE) + { /* image file */ + l [0] = len & 0377; /* PDP-11 byte order */ + l [1] = (len >> 8) &0377; + l [2] = 0; /* our recs are always < 64 KB */ + l [3] = 0; + dowrite (mtape->tapefd, l, 4); /* write longword length */ + dowrite (mtape->tapefd, buf, len); /* write data */ + dowrite (mtape->tapefd, l, 4); /* write length again */ + } + else if (mtape->tape_type == TT_RMT) + { /* rmt tape */ + int n; + n = sprintf (mtape->netbuf, "W%d\n", len); + dowrite (mtape->tapefd, mtape->netbuf, n); + dowrite (mtape->tapefd, buf, len); + } + else + dowrite (mtape->tapefd, buf, len); /* just write the data if tape */ + + mtape->count += len + (mtape->bpi * 3 /5); /* add to byte count + (+0.6" tape gap) */ +} + + +/* write a tape mark */ +void tapemark (tape_handle mtape) +{ + static char zero [4] = { 0, 0, 0, 0 }; + + if (mtape->tape_type == TT_IMAGE) + { /* image file */ + dowrite (mtape->tapefd, zero, 4); /* write longword length */ + } + else + { /* local/remote tape drive */ + if (doioctl (mtape, & mt_weof) < 0) + { + perror ("?Failed writing tape mark"); + exit (1); + } + } + mtape->count += 3 * mtape->bpi; /* 3" of tape */ +} + + +/* skip records (negative for reverse) */ +void skiprec (tape_handle mtape, int count) +{ + unsigned char byte [4]; /* 32 bits for length field(s) */ + unsigned long l; /* at least 32 bits */ + + if (mtape->tape_type != TT_IMAGE) + { + fprintf (stderr, "?Record skip only implemented for image files"); + exit (1); + } + + if (count < 0) + { + fprintf (stderr, "?Record skip reverse not yet implemented"); + exit (1); + } + + while (count--) + { + doread (mtape->tapefd, byte, 4); /* get record length */ + + /* compose into longword */ + l=((unsigned long)byte[3]<<24L)|((unsigned long)byte[2]<<16L)| + ((unsigned long)byte[1]<<8L)|(unsigned long)byte[0]; + + if (l == 0) /* hit tape mark? */ + return; /* note that we've effectively skipped over the tape mark */ + + /* skip record */ + if (lseek (mtape->tapefd, l, SEEK_CUR) < 0) + { + perror ("?Seek failed"); + exit (1); + } + + doread (mtape->tapefd, byte, 4); /* get trailing record length */ + if((((unsigned long)byte[3]<<24L)| + ((unsigned long)byte[2]<<16L)| + ((unsigned long)byte[1]<<8)| + (unsigned long)byte[0])!=l) + { /* should match */ + fprintf (stderr,"?Corrupt tape image\n"); + exit(1); + } + } +} + + +/* skip forward to the next file mark, and leave the tape positioned + after the mark */ +static void skip_to_mark (tape_handle mtape) +{ + unsigned char byte [4]; /* 32 bits for length field(s) */ + unsigned long l; /* at least 32 bits */ + + static char scratch_buf [4096]; + + if (mtape->tape_type != TT_IMAGE) + { + fprintf (stderr, "?Record skip only implemented for image files"); + exit (1); + } + + for (;;) + { + doread (mtape->tapefd, byte, 4); /* get record length */ + + /* compose into longword */ + l=((unsigned long)byte[3]<<24L)|((unsigned long)byte[2]<<16L)| + ((unsigned long)byte[1]<<8L)|(unsigned long)byte[0]; + + if (l == 0) /* hit tape mark? */ + return; /* note that we've effectively skipped over the tape mark */ + + /* skip record */ + if (mtape->seek_ok) + { + if (lseek (mtape->tapefd, l, SEEK_CUR) < 0) + { + perror ("?Seek failed"); + exit (1); + } + } + else + { + int len, len2; + len = l; + while (len > 0) + { + len2 = len; + if (len2 > sizeof (scratch_buf)) + len2 = sizeof (scratch_buf); + doread (mtape->tapefd, scratch_buf, len2); /* read data */ + len -= len2; + } + } + + doread (mtape->tapefd, byte, 4); /* get trailing record length */ + if((((unsigned long)byte[3]<<24L)| + ((unsigned long)byte[2]<<16L)| + ((unsigned long)byte[1]<<8)| + (unsigned long)byte[0])!=l) + { /* should match */ + fprintf (stderr,"?Corrupt tape image\n"); + exit(1); + } + } +} + + +/* skip files (negative for reverse) */ +void skipfile (tape_handle mtape, int count) +{ + if (mtape->tape_type != TT_IMAGE) + { + fprintf (stderr, "?File skip only implemented for image files"); + exit (1); + } + + if (count < 0) + { + fprintf (stderr, "?File skip reverse not yet implemented"); + exit (1); + } + + while (count--) + { + skip_to_mark (mtape); + } +} + diff --git a/tapeio.h b/tapeio.h new file mode 100644 index 0000000..63245b7 --- /dev/null +++ b/tapeio.h @@ -0,0 +1,53 @@ +/* + Routines to do magtape I/O to local tapes, remote tapes, and tape image + files. + + Copyright 1998, 1999 John Wilson and Eric Smith + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License version 2 as published + by the Free Software Foundation. Note that permission is not granted + to redistribute this program under the terms of any other version of the + General Public License. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + + +typedef struct mtape_t *tape_handle; /* opaque type */ + + +/* open a tape drive */ +tape_handle opentape (char *name, int create, int writable); + +/* close a tape drive */ +void closetape (tape_handle h); + +/* rewind tape */ +void posnbot (tape_handle h); + +/* position tape at EOT (between the two tape marks) */ +void posneot (tape_handle h); + +/* read a tape record, return actual length (0=tape mark) */ +int getrec (tape_handle h, char *buf, int len); + +/* write a tape record */ +void putrec (tape_handle h, char *buf, int len); + +/* write a tape mark */ +void tapemark (tape_handle h); + +/* skip records (negative for reverse) */ +void skiprec (tape_handle h, int count); + +/* skip files (negative for reverse) */ +void skipfile (tape_handle h, int count); +