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/* tapesplt.C (c) Copyright Jay Maynard, 2000-2005 */
/* Split AWSTAPE format tape image */
/*-------------------------------------------------------------------*/
/* This program reads an AWSTAPE format tape image file and produces */
/* output files containing pieces of it, controlled by command line */
/* options. */
/*-------------------------------------------------------------------*/
#include "hstdinc.h"
#include "hercules.h"
/*-------------------------------------------------------------------*/
/* Structure definition for AWSTAPE block header */
/*-------------------------------------------------------------------*/
typedef struct _AWSTAPE_BLKHDR {
HWORD curblkl; /* Length of this block */
HWORD prvblkl; /* Length of previous block */
BYTE flags1; /* Flags byte 1 */
BYTE flags2; /* Flags byte 2 */
} AWSTAPE_BLKHDR;
/* Definitions for AWSTAPE_BLKHDR flags byte 1 */
#define AWSTAPE_FLAG1_NEWREC 0x80 /* Start of new record */
#define AWSTAPE_FLAG1_TAPEMARK 0x40 /* Tape mark */
#define AWSTAPE_FLAG1_ENDREC 0x20 /* End of record */
/*-------------------------------------------------------------------*/
/* Static data areas */
/*-------------------------------------------------------------------*/
static BYTE vollbl[] = "\xE5\xD6\xD3"; /* EBCDIC characters "VOL" */
static BYTE hdrlbl[] = "\xC8\xC4\xD9"; /* EBCDIC characters "HDR" */
static BYTE eoflbl[] = "\xC5\xD6\xC6"; /* EBCDIC characters "EOF" */
static BYTE eovlbl[] = "\xC5\xD6\xE5"; /* EBCDIC characters "EOV" */
static BYTE buf[65536];
#ifdef EXTERNALGUI
/* Report progress every this many bytes */
#define PROGRESS_MASK (~0x3FFFF /* 256K */)
/* How many bytes we've read so far. */
long curpos = 0;
long prevpos = 0;
#endif /*EXTERNALGUI*/
/*-------------------------------------------------------------------*/
/* tapesplt main entry point */
/*-------------------------------------------------------------------*/
int main (int argc, char *argv[])
{
int rc; /* Return code */
int i; /* Array subscript */
int len; /* Block length */
int prevlen; /* Previous block length */
char *infilename; /* -> Input file name */
char *outfilename; /* -> Current out file name */
int infd = -1; /* Input file descriptor */
int outfd = -1; /* Current out file desc */
int fileno; /* Tape file number */
int blkcount; /* Block count */
int curblkl; /* Current block length */
int minblksz; /* Minimum block size */
int maxblksz; /* Maximum block size */
int outfilenum; /* Current out file# in argv */
int outfilecount; /* Current # files copied */
int files2copy; /* Current # files to copy */
BYTE labelrec[81]; /* Standard label (ASCIIZ) */
AWSTAPE_BLKHDR awshdr; /* AWSTAPE block header */
BYTE pathname[MAX_PATH]; /* file path in host format */
set_codepage(NULL);
#ifdef EXTERNALGUI
if (argc >= 1 && strncmp(argv[argc-1],"EXTERNALGUI",11) == 0)
{
extgui = 1;
argc--;
setvbuf(stderr, NULL, _IONBF, 0);
setvbuf(stdout, NULL, _IONBF, 0);
}
#endif /*EXTERNALGUI*/
/* Display the program identification message */
display_version (stderr, "Hercules tape split program ", FALSE);
/* The only argument is the tape image file name */
if (argc > 3 && argv[1] != NULL)
{
infilename = argv[1];
}
else
{
printf ("Usage: tapesplt infilename outfilename count [...]\n");
exit (1);
}
/* Open the tape device */
hostpath(pathname, infilename, sizeof(pathname));
infd = open (pathname, O_RDONLY | O_BINARY);
if (infd < 0)
{
printf ("tapesplt: error opening input file %s: %s\n",
infilename, strerror(errno));
exit (2);
}
/* Copy blocks from input to output files */
fileno = 1;
blkcount = 0;
minblksz = 0;
maxblksz = 0;
len = 0;
for (outfilenum = 2; outfilenum < argc; outfilenum += 2)
{
outfilename = argv[outfilenum];
printf ("Writing output file %s.\n", outfilename);
hostpath(pathname, outfilename, sizeof(pathname));
outfd = open (pathname, O_WRONLY | O_CREAT | O_BINARY,
S_IRUSR | S_IWUSR | S_IRGRP);
if (outfd < 0)
{
printf ("tapesplt: error opening output file %s: %s\n",
outfilename, strerror(errno));
exit (3);
}
if (outfilenum == argc)
{
/* count not specified for last file, so use big number */
files2copy = 32767;
}
else
{
files2copy = atoi(argv[outfilenum + 1]);
}
/* Copy just that many files */
for (outfilecount = 0; outfilecount < files2copy; )
{
/* Save previous block length */
prevlen = len;
/* Read a block from the tape */
len = read (infd, buf, sizeof(AWSTAPE_BLKHDR));
if (len < 0)
{
printf ("tapesplt: error reading header block from %s: %s\n",
infilename, strerror(errno));
exit (4);
}
/* Did we finish too soon? */
if ((len > 0) && (len < (int)sizeof(AWSTAPE_BLKHDR)))
{
printf ("tapesplt: incomplete block header on %s\n",
infilename);
exit(5);
}
#ifdef EXTERNALGUI
if (extgui)
{
curpos += len;
/* Report progress every nnnK */
if( ( curpos & PROGRESS_MASK ) != ( prevpos & PROGRESS_MASK ) )
{
prevpos = curpos;
fprintf( stderr, "IPOS=%ld\n", curpos );
}
}
#endif /*EXTERNALGUI*/
/* Check for end of tape. */
if (len == 0)
{
printf ("End of input tape.\n");
break;
}
/* Copy the header to the output file. */
rc = write(outfd, buf, sizeof(AWSTAPE_BLKHDR));
if (rc < (int)sizeof(AWSTAPE_BLKHDR))
{
printf ("tapesplt: error writing block header to %s: %s\n",
outfilename, strerror(errno));
exit(6);
}
/* Parse the block header */
memcpy(&awshdr, buf, sizeof(AWSTAPE_BLKHDR));
/* Tapemark? */
if ((awshdr.flags1 & AWSTAPE_FLAG1_TAPEMARK) != 0)
{
/* Print summary of current file */
printf ("File %u: Blocks=%u, block size min=%u, max=%u\n",
fileno, blkcount, minblksz, maxblksz);
/* Reset counters for next file */
fileno++;
minblksz = 0;
maxblksz = 0;
blkcount = 0;
/* Count the file we just copied. */
outfilecount++;
}
else /* if(tapemark) */
{
/* Count blocks and block sizes */
blkcount++;
curblkl = awshdr.curblkl[0] + (awshdr.curblkl[1] << 8);
if (curblkl > maxblksz) maxblksz = curblkl;
if (minblksz == 0 || curblkl < minblksz) minblksz = curblkl;
/* Read the data block. */
len = read (infd, buf, curblkl);
if (len < 0)
{
printf ("tapesplt: error reading data block from %s: %s\n",
infilename, strerror(errno));
exit (7);
}
/* Did we finish too soon? */
if ((len > 0) && (len < curblkl))
{
printf ("tapesplt: incomplete final data block on %s: "
"expected %d bytes, got %d\n",
infilename, curblkl, len);
exit(8);
}
/* Check for end of tape */
if (len == 0)
{
printf ("tapesplt: header block with no data on %s\n",
infilename);
exit(9);
}
#ifdef EXTERNALGUI
if (extgui)
{
curpos += len;
/* Report progress every nnnK */
if( ( curpos & PROGRESS_MASK ) != ( prevpos & PROGRESS_MASK ) )
{
prevpos = curpos;
fprintf( stderr, "IPOS=%ld\n", curpos );
}
}
#endif /*EXTERNALGUI*/
/* Copy the header to the output file. */
rc = write(outfd, buf, len);
if (rc < len)
{
printf ("tapesplt: error writing data block to %s: %s\n",
outfilename, strerror(errno));
exit(10);
}
/* Print standard labels */
if (len == 80 && blkcount < 4
&& (memcmp(buf, vollbl, 3) == 0
|| memcmp(buf, hdrlbl, 3) == 0
|| memcmp(buf, eoflbl, 3) == 0
|| memcmp(buf, eovlbl, 3) == 0))
{
for (i=0; i < 80; i++)
labelrec[i] = guest_to_host(buf[i]);
labelrec[i] = '\0';
printf ("%s\n", labelrec);
}
} /* end if(tapemark) */
} /* end for(outfilecount) */
close(outfd);
} /* end for(outfilenum) */
/* Close files and exit */
close (infd);
return 0;
} /* end function main */
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