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dasdpdsu.c
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dasdpdsu.c
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/* DASDPDSU.C (c) Copyright Roger Bowler, 1999-2009 */
/* Hercules DASD Utilities: PDS unloader */
/*-------------------------------------------------------------------*/
/* This program unloads members of a partitioned dataset from */
/* a virtual DASD volume and copies each member to a flat file. */
/* */
/* The command format is: */
/* dasdpdsu ckdfile dsname [ascii] */
/* where: ckdfile is the name of the CKD image file */
/* dsname is the name of the PDS to be unloaded */
/* ascii is an optional keyword which will cause the members */
/* to be unloaded as ASCII variable length text files. */
/* Each member is copied to a file memname.mac in the current */
/* working directory. If the ascii keyword is not specified then */
/* the members are unloaded as fixed length binary files. */
/*-------------------------------------------------------------------*/
#include "hstdinc.h"
#include "hercules.h"
#include "dasdblks.h"
/*-------------------------------------------------------------------*/
/* Static data areas */
/*-------------------------------------------------------------------*/
static BYTE asciiflag = 0; /* 1=Translate to ASCII */
static BYTE eighthexFF[] = {0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff};
/*-------------------------------------------------------------------*/
/* Subroutine to process a member */
/* Input: */
/* cif -> CKD image file descriptor structure */
/* noext Number of extents in dataset */
/* extent Dataset extent array */
/* memname Member name (ASCIIZ) */
/* ttr Member TTR */
/* */
/* Return value is 0 if successful, or -1 if error */
/*-------------------------------------------------------------------*/
static int
process_member (CIFBLK *cif, int noext, DSXTENT extent[],
char *memname, BYTE *ttr)
{
int rc; /* Return code */
int len; /* Record length */
int trk; /* Relative track number */
int cyl; /* Cylinder number */
int head; /* Head number */
int rec; /* Record number */
BYTE *buf; /* -> Data block */
FILE *ofp; /* Output file pointer */
char ofname[256]; /* Output file name */
int offset; /* Offset of record in buffer*/
char card[81]; /* Logical record (ASCIIZ) */
char pathname[MAX_PATH]; /* ofname in host format */
/* Build the output file name */
memset (ofname, 0, sizeof(ofname));
strncpy (ofname, memname, 8);
string_to_lower (ofname);
strcat (ofname, ".mac");
/* Open the output file */
hostpath(pathname, ofname, sizeof(pathname));
ofp = fopen (pathname, (asciiflag? "w" : "wb"));
if (ofp == NULL)
{
fprintf (stderr,
"Cannot open %s: %s\n",
ofname, strerror(errno));
return -1;
}
/* Point to the start of the member */
trk = (ttr[0] << 8) | ttr[1];
rec = ttr[2];
fprintf (stderr,
"Member %s TTR=%4.4X%2.2X\n",
memname, trk, rec);
/* Read the member */
while (1)
{
/* Convert relative track to cylinder and head */
rc = convert_tt (trk, noext, extent, cif->heads, &cyl, &head);
if (rc < 0) return -1;
// fprintf (stderr,
// "CCHHR=%4.4X%4.4X%2.2X\n",
// cyl, head, rec);
/* Read a data block */
rc = read_block (cif, cyl, head, rec, NULL, NULL, &buf, &len);
if (rc < 0) return -1;
/* Move to next track if record not found */
if (rc > 0)
{
trk++;
rec = 1;
continue;
}
/* Exit at end of member */
if (len == 0) break;
/* Check length of data block */
if (len % 80 != 0)
{
fprintf (stderr,
"Bad block length %d at cyl %d head %d rec %d\n",
len, cyl, head, rec);
return -1;
}
/* Process each record in the data block */
for (offset = 0; offset < len; offset += 80)
{
if (asciiflag)
{
make_asciiz (card, sizeof(card), buf + offset, 72);
fprintf (ofp, "%s\n", card);
}
else
{
fwrite (buf+offset, 80, 1, ofp);
}
if (ferror(ofp))
{
fprintf (stderr,
"Error writing %s: %s\n",
ofname, strerror(errno));
return -1;
}
} /* end for(offset) */
/* Point to the next data block */
rec++;
} /* end while */
/* Close the output file and exit */
fclose (ofp);
return 0;
} /* end function process_member */
/*-------------------------------------------------------------------*/
/* Subroutine to process a directory block */
/* Input: */
/* cif -> CKD image file descriptor structure */
/* noext Number of extents in dataset */
/* extent Dataset extent array */
/* dirblk Pointer to directory block */
/* */
/* Return value is 0 if OK, +1 if end of directory, or -1 if error */
/*-------------------------------------------------------------------*/
static int
process_dirblk (CIFBLK *cif, int noext, DSXTENT extent[], BYTE *dirblk)
{
int rc; /* Return code */
int size; /* Size of directory entry */
int k; /* Userdata halfword count */
BYTE *dirptr; /* -> Next byte within block */
int dirrem; /* Number of bytes remaining */
PDSDIR *dirent; /* -> Directory entry */
char memname[9]; /* Member name (ASCIIZ) */
/* Load number of bytes in directory block */
dirptr = dirblk;
dirrem = (dirptr[0] << 8) | dirptr[1];
if (dirrem < 2 || dirrem > 256)
{
fprintf (stderr, "Directory block byte count is invalid\n");
return -1;
}
/* Point to first directory entry */
dirptr += 2;
dirrem -= 2;
/* Process each directory entry */
while (dirrem > 0)
{
/* Point to next directory entry */
dirent = (PDSDIR*)dirptr;
/* Test for end of directory */
if (memcmp(dirent->pds2name, eighthexFF, 8) == 0)
return +1;
/* Extract the member name */
make_asciiz (memname, sizeof(memname), dirent->pds2name, 8);
/* Process the member */
rc = process_member (cif, noext, extent, memname,
dirent->pds2ttrp);
if (rc < 0) return -1;
/* Load the user data halfword count */
k = dirent->pds2indc & PDS2INDC_LUSR;
/* Point to next directory entry */
size = 12 + k*2;
dirptr += size;
dirrem -= size;
}
return 0;
} /* end function process_dirblk */
/*-------------------------------------------------------------------*/
/* DASDPDSU main entry point */
/*-------------------------------------------------------------------*/
int main (int argc, char *argv[])
{
int rc; /* Return code */
int i=0; /* Arument index */
int len; /* Record length */
int cyl; /* Cylinder number */
int head; /* Head number */
int rec; /* Record number */
int trk; /* Relative track number */
char *fname; /* -> CKD image file name */
char *sfname=NULL; /* -> CKD shadow file name */
char dsnama[45]; /* Dataset name (ASCIIZ) */
int noext; /* Number of extents */
DSXTENT extent[16]; /* Extent descriptor array */
BYTE *blkptr; /* -> PDS directory block */
BYTE dirblk[256]; /* Copy of directory block */
CIFBLK *cif; /* CKD image file descriptor */
INITIALIZE_UTILITY("dasdpdsu");
/* Display the program identification message */
display_version (stderr, "Hercules PDS unload program ", FALSE);
/* Check the number of arguments */
if (argc < 3 || argc > 5)
{
fprintf (stderr,
"Usage: %s ckdfile [sf=shadow-file-name] pdsname [ascii]\n",
argv[0]);
return -1;
}
/* The first argument is the name of the CKD image file */
fname = argv[1];
/* The next argument may be the shadow file name */
if (!memcmp (argv[2], "sf=", 3))
{
sfname = argv[2];
i = 1;
}
/* The second argument is the dataset name */
memset (dsnama, 0, sizeof(dsnama));
strncpy (dsnama, argv[2|+i], sizeof(dsnama)-1);
string_to_upper (dsnama);
/* The third argument is an optional keyword */
if (argc > 3+i && argv[3+i] != NULL)
{
if (strcasecmp(argv[3+i], "ascii") == 0)
asciiflag = 1;
else
{
fprintf (stderr,
"Keyword %s is not recognized\n",
argv[3+i]);
return -1;
}
}
/* Open the CKD image file */
cif = open_ckd_image (fname, sfname, O_RDONLY|O_BINARY, 0);
if (cif == NULL) return -1;
/* Build the extent array for the requested dataset */
rc = build_extent_array (cif, dsnama, extent, &noext);
if (rc < 0) return -1;
#ifdef EXTERNALGUI
/* Calculate ending relative track */
if (extgui)
{
int bcyl; /* Extent begin cylinder */
int btrk; /* Extent begin head */
int ecyl; /* Extent end cylinder */
int etrk; /* Extent end head */
int trks; /* total tracks in dataset */
int i; /* loop control */
for (i = 0, trks = 0; i < noext; i++)
{
bcyl = (extent[i].xtbcyl[0] << 8) | extent[i].xtbcyl[1];
btrk = (extent[i].xtbtrk[0] << 8) | extent[i].xtbtrk[1];
ecyl = (extent[i].xtecyl[0] << 8) | extent[i].xtecyl[1];
etrk = (extent[i].xtetrk[0] << 8) | extent[i].xtetrk[1];
trks += (((ecyl * cif->heads) + etrk) - ((bcyl * cif->heads) + btrk)) + 1;
}
fprintf(stderr,"ETRK=%d\n",trks-1);
}
#endif /*EXTERNALGUI*/
/* Point to the start of the directory */
trk = 0;
rec = 1;
/* Read the directory */
while (1)
{
#ifdef EXTERNALGUI
if (extgui) fprintf(stderr,"CTRK=%d\n",trk);
#endif /*EXTERNALGUI*/
/* Convert relative track to cylinder and head */
rc = convert_tt (trk, noext, extent, cif->heads, &cyl, &head);
if (rc < 0) return -1;
/* Read a directory block */
fprintf (stderr,
"Reading directory block at cyl %d head %d rec %d\n",
cyl, head, rec);
rc = read_block (cif, cyl, head, rec,
NULL, NULL, &blkptr, &len);
if (rc < 0) return -1;
/* Move to next track if block not found */
if (rc > 0)
{
trk++;
rec = 1;
continue;
}
/* Exit at end of directory */
if (len == 0) break;
/* Copy the directory block */
memcpy (dirblk, blkptr, sizeof(dirblk));
/* Process each member in the directory block */
rc = process_dirblk (cif, noext, extent, dirblk);
if (rc < 0) return -1;
if (rc > 0) break;
/* Point to the next directory block */
rec++;
} /* end while */
fprintf (stderr,
"End of directory\n");
/* Close the CKD image file and exit */
rc = close_ckd_image (cif);
return rc;
} /* end function main */