cardrdr.c

/* CARDRDR.C    (c) Copyright Roger Bowler, 1999-2003                */
/*              ESA/390 Card Reader Device Handler                   */

/*-------------------------------------------------------------------*/
/* This module contains device handling functions for emulated       */
/* card reader devices.                                              */
/*-------------------------------------------------------------------*/

#include "hercules.h"

#include "devtype.h"

#include "sockdev.h"


#if defined(OPTION_DYNAMIC_LOAD) && defined(WIN32) && !defined(HDL_USE_LIBTOOL)
 SYSBLK *psysblk;
 #define sysblk (*psysblk)
#endif


/*-------------------------------------------------------------------*/
/* ISW 2003/03/07                                                    */
/* 3505 Byte 1 Sense Codes                                           */
/*-------------------------------------------------------------------*/
#define SENSE1_RDR_PERM         0x80 /* Permanent Err key depressed  */
#define SENSE1_RDR_AUTORETRY    0x40 /* Don't know                   */
#define SENSE1_RDR_MOTIONMF     0x20 /* Motion Malfunction           */
#define SENSE1_RDR_RAIC         0x10 /* Retry After Intreq Cleared   */
/*-------------------------------------------------------------------*/
/* Internal macro definitions                                        */
/*-------------------------------------------------------------------*/
#define CARD_SIZE        80
#define HEX40            ((BYTE)0x40)

/*-------------------------------------------------------------------*/
/* Initialize the device handler                                     */
/*-------------------------------------------------------------------*/
static int cardrdr_init_handler ( DEVBLK *dev, int argc, BYTE *argv[] )
{
int     i;                              /* Array subscript           */
int     fc;                             /* File counter              */

    int sockdev = 0;

    if (dev->bs)
    {
        if (!unbind_device(dev))
        {
            // (error message already issued)
            return -1;
        }
    }

    /* Initialize device dependent fields */

    dev->fd = -1;
    dev->fh = NULL;
    dev->multifile = 0;
    dev->ebcdic = 0;
    dev->ascii = 0;
    dev->trunc = 0;
    dev->cardpos = 0;
    dev->cardrem = 0;
    dev->autopad = 0;

    if(!sscanf(dev->typname,"%hx",&(dev->devtype)))
        dev->devtype = 0x2501;

    fc = 0;

    if (dev->more_files) free (dev->more_files);

    dev->more_files = malloc(sizeof(char*) * (fc + 1));

    if (!dev->more_files)
    {
        logmsg (_("HHCRD001E Out of memory\n"));
        return -1;
    }

    dev->more_files[fc] = NULL;

    /* Process the driver arguments starting with the SECOND
       argument. (The FIRST argument is the filename and is
       checked later further below.) */

    for (i = 1; i < argc; i++)
    {
        /* sockdev means the device file is actually
           a connected socket instead of a disk file.
           The file name is the socket_spec (host:port)
           to listen for connections on. */

        if (strcasecmp(argv[i], "sockdev") == 0)
        {
            sockdev = 1;
            continue;
        }

        /* multifile means to automatically open the next
           i/p file if multiple i/p files are defined.   */

        if (strcasecmp(argv[i], "multifile") == 0)
        {
            dev->multifile = 1;
            continue;
        }

        /* eof means that unit exception will be returned at
           end of file, instead of intervention required */

        if (strcasecmp(argv[i], "eof") == 0)
        {
            dev->rdreof = 1;
            continue;
        }

        /* intrq means that intervention required will be returned at
           end of file, instead of unit exception */

        if (strcasecmp(argv[i], "intrq") == 0)
        {
            dev->rdreof = 0;
            continue;
        }

        /* ebcdic means that the card image file consists of
           fixed length 80-byte EBCDIC card images with no
           line-end delimiters */

        if (strcasecmp(argv[i], "ebcdic") == 0)
        {
            dev->ebcdic = 1;
            continue;
        }

        /* ascii means that the card image file consists of
           variable length ASCII records delimited by either
           line-feed or carriage-return line-feed sequences */

        if (strcasecmp(argv[i], "ascii") == 0)
        {
            dev->ascii = 1;
            continue;
        }

        /* trunc means that records longer than 80 bytes will
           be silently truncated to 80 bytes when processing a
           variable length ASCII file.  The default behaviour
           is to present a data check if an overlength record
           is encountered.  The trunc option is ignored except
           when processing an ASCII card image file. */

        if (strcasecmp(argv[i], "trunc") == 0)
        {
            dev->trunc = 1;
            continue;
        }

        /* autopad means that if reading fixed sized records
         * (ebcdic) and end of file is reached in the middle of
         * a record, the record is automatically padded to 80 bytes.
         */

        if (strcasecmp(argv[i], "autopad") == 0)
        {
            dev->autopad = 1;
            continue;
        }

        // add additional file arguments

        if (strlen(argv[i]) > sizeof(dev->filename)-1)
        {
            logmsg (_("HHCRD002E File name too long (max=%ud): \"%s\"\n"),
                (unsigned int)sizeof(dev->filename)-1,argv[i]);
            return -1;
        }

        if (access(argv[i], R_OK | F_OK) != 0)
        {
            logmsg (_("HHCRD003E Unable to access file \"%s\": %s\n"),
                argv[i], strerror(errno));
            return -1;
        }

        dev->more_files[fc++] = strdup(argv[i]);
        dev->more_files = realloc(dev->more_files, sizeof(char*) * (fc + 1));

        if (!dev->more_files)
        {
            logmsg (_("HHCRD004E Out of memory\n"));
            return -1;
        }

        dev->more_files[fc] = NULL;
    }

    dev->current_file = dev->more_files;

    /* Check for conflicting arguments */

    if (dev->ebcdic && dev->ascii)
    {
        logmsg (_("HHCRD005E Specify 'ascii' or 'ebcdic' (or neither) but"
                  " not both\n"));
        return -1;
    }

    if (sockdev)
    {
        if (fc)
        {
            logmsg (_("HHCRD006E Only one filename (sock_spec) allowed for"
                      " socket devices\n"));
            return -1;
        }

        // If neither ascii nor ebcdic is specified, default to ascii.
        // This is required for socket devices because the open logic,
        // if neither is specified, attempts to determine whether the data
        // is actually ascii or ebcdic by reading the 1st 160 bytes of
        // data and then rewinding to the beginning of the file afterwards.
        //  Since you can't "rewind" a socket, we must therefore default
        // to one of them.

        if (!dev->ebcdic && !dev->ascii)
        {
            logmsg (_("HHCRD007I Defaulting to 'ascii' for socket device"
                      " %4.4X\n"),dev->devnum);
            dev->ascii = 1;
        }
    }

    if (dev->multifile && !fc)
    {
        logmsg (_("HHCRD008W 'multifile' option ignored: only one file"
                  " specified\n"));
        dev->multifile = 0;
    }

    /* The first argument is the file name */

    if (argc > 0)
    {
        /* Check for valid file name */

        if (strlen(argv[0]) > sizeof(dev->filename)-1)
        {
            logmsg (_("HHCRD009E File name too long (max=%ud): \"%s\"\n"),
                (unsigned int)sizeof(dev->filename)-1,argv[0]);
            return -1;
        }

        if (!sockdev)
        {
            /* Check for specification of no file mounted on reader */
            if (argv[0][0] == '*')
            {
                dev->filename[0] = '\0';
            }
            else if (access(argv[0], R_OK | F_OK) != 0)
            {
                logmsg (_("HHCRD010E Unable to access file \"%s\": %s\n"),
                    argv[0], strerror(errno));
                return -1;
            }
        }

        /* Save the file name in the device block */

        strcpy (dev->filename, argv[0]);
    }
    else
    {
        dev->filename[0] = '\0';
    }

    /* Set size of i/o buffer */

    dev->bufsize = CARD_SIZE;

    /* Set number of sense bytes */

    /* ISW 20030307 : Empirical knowledge : DOS/VS R34 Erep */
    /*                indicates 4 bytes in 3505 sense       */
    dev->numsense = 4;

    /* Initialize the device identifier bytes */

    dev->devid[0] = 0xFF;
    dev->devid[1] = 0x28; /* Control unit type is 2821-1 */
    dev->devid[2] = 0x21;
    dev->devid[3] = 0x01;
    dev->devid[4] = dev->devtype >> 8;
    dev->devid[5] = dev->devtype & 0xFF;
    dev->devid[6] = 0x01;
    dev->numdevid = 7;

    // If socket device, create a listening socket
    // to accept connections on.

    if (sockdev && !bind_device(dev,dev->filename))
    {
        // (error message already issued)
        return -1;
    }

    return 0;
} /* end function cardrdr_init_handler */

/*-------------------------------------------------------------------*/
/* Query the device definition                                       */
/*-------------------------------------------------------------------*/
static void cardrdr_query_device (DEVBLK *dev, BYTE **class,
                int buflen, BYTE *buffer)
{
    *class = "RDR";

    snprintf (buffer, buflen, "%s%s%s%s%s%s%s%s",
        ((dev->filename[0] == '\0') ? "*"          : (char *)dev->filename),
        (dev->bs ?                    " sockdev"   : ""),
        (dev->multifile ?             " multifile" : ""),
        (dev->ascii ?                 " ascii"     : ""),
        (dev->ebcdic ?                " ebcdic"    : ""),
        (dev->autopad ?               " autopad"   : ""),
        ((dev->ascii && dev->trunc) ? " trunc"     : ""),
        (dev->rdreof ?                " eof"       : " intrq"));

} /* end function cardrdr_query_device */

/*-------------------------------------------------------------------*/
/* Close the device                                                  */
/*-------------------------------------------------------------------*/
static int cardrdr_close_device ( DEVBLK *dev )
{
    /* Close the device file */

    if (dev->fh && fclose(dev->fh) != 0)
    {
        logmsg (_("HHCRD011E Close error on file \"%s\": %s\n"),
            dev->filename, strerror(errno));
        dev->fd = -1;
        dev->fh = NULL;
        return -1;
    }

    if (dev->bs && (dev->bs->clientip || dev->bs->clientname))
    {
        logmsg (_("HHCRD012I %s (%s) disconnected from device %4.4X (%s)\n"),
            dev->bs->clientip, dev->bs->clientname, dev->devnum, dev->bs->spec);
    }

    dev->fd = -1;
    dev->fh = NULL;

    return 0;
} /* end function cardrdr_close_device */


/*-------------------------------------------------------------------*/
/* Clear the card reader                                             */
/*-------------------------------------------------------------------*/
static int clear_cardrdr ( DEVBLK *dev )
{
    /* Close the card image file */
    if (cardrdr_close_device(dev) != 0) return -1;

    if (dev->bs) return 0;

    /* Clear the file name */
    dev->filename[0] = '\0';

    /* If next file is available, open it */
    if (dev->current_file && *(dev->current_file))
    {
        strcpy(dev->filename, *(dev->current_file++));
    }
    else
    {
        /* Reset the device dependent flags */
        dev->multifile = 0;
        dev->ascii = 0;
        dev->ebcdic = 0;
//        dev->rdreof = 0;
        dev->trunc = 0;
        dev->autopad = 0;
    }

    return 0;
} /* end function clear_cardrdr */


/*-------------------------------------------------------------------*/
/* Open the card image file                                          */
/*-------------------------------------------------------------------*/
static int open_cardrdr ( DEVBLK *dev, BYTE *unitstat )
{
int     rc;                             /* Return code               */
int     i;                              /* Array subscript           */
int     len;                            /* Length of data            */
BYTE    buf[160];                       /* Auto-detection buffer     */

    *unitstat = 0;

    // Socket device?

    if (dev->bs)
    {
        // Intervention required if no one has connected yet

        if (dev->fd == -1)
        {
            if(dev->rdreof)
            {
                *unitstat=CSW_CE|CSW_DE|CSW_UX;
                return -1;
            }
            dev->sense[0] = SENSE_IR;
            dev->sense[1] = SENSE1_RDR_RAIC; /* Retry when IntReq Cleared */
            *unitstat = CSW_CE | CSW_DE | CSW_UC;
            return -1;
        }

        if (!dev->fh)
        {
            /*  GNU 'C' Library documentation for "fdopen":

                  "The opentype argument is interpreted in the same
                   way as for the fopen function (see section Opening
                   Streams), except that the 'b' option is not permitted;
                   this is because GNU makes no distinction between text
                   and binary files. [...] You must make sure that the
                   opentype argument matches the actual mode of the open
                   file descriptor."

                GNU 'C' Library documentation for "fopen":

                  "The character 'b' in opentype has a standard meaning;
                   it requests a binary stream rather than a text stream.
                   But this makes no difference in POSIX systems (including
                   the GNU system). If both `+' and 'b' are specified,
                   they can appear in either order. See section Text and
                   Binary Streams."

                GNU 'C' Library documentation for "Text and Binary Streams":

                  "When you open a stream, you can specify either a text
                   stream or a binary stream. You indicate that you want
                   a binary stream by specifying the 'b' modifier in the
                   opentype argument to fopen; see section Opening Streams.
                   Without this option, fopen opens the file as a text stream."

                Note that even though it clearly states (for fdopen) that the
                'b' option "is NOT permitted", we are assuming such is not true
                since it accepts it (but simply ignores it) for fopen. Further-
                more, since Windows (Cygwin?) DOES make a distinction between
                binary and text files, we should specify the 'b' option in our
                call to fdopen. (It has already been verified that this is safe
                to do on Linux systems, so to play it safe (i.e. to prevent any
                potential problems on Windows systems), we always specify 'b'.)
            */

            dev->fh = fdopen(dev->fd, "rb");
        }

        ASSERT(dev->fd != -1 && dev->fh);

        return 0;
    }

    /* Intervention required if device has no file name */
    if (dev->filename[0] == '\0')
    {
        if(dev->rdreof)
        {
            *unitstat=CSW_CE|CSW_DE|CSW_UX;
            return -1;
        }
        dev->sense[0] = SENSE_IR;
        dev->sense[1] = SENSE1_RDR_RAIC; /* Retry when IntReq Cleared */
        *unitstat = CSW_CE | CSW_DE | CSW_UC;
        return -1;
    }

    /* Open the device file */
    rc = open (dev->filename, O_RDONLY | O_BINARY);
    if (rc < 0)
    {
        /* Handle open failure */
        logmsg (_("HHCRD013E Error opening file %s: %s\n"),
                dev->filename, strerror(errno));

        /* Set unit check with equipment check */
        dev->sense[0] = SENSE_EC;
        *unitstat = CSW_CE | CSW_DE | CSW_UC;
        return -1;
    }

    /* Save the file descriptor in the device block */
    dev->fd = rc;
    dev->fh = fdopen(dev->fd, "rb");    /* NOTE: see comments in
                                           function "open_cardrdr"
                                           regarding fdopen. */

    /* If neither EBCDIC nor ASCII was specified, attempt to
       detect the format by inspecting the first 160 bytes */
    if (dev->ebcdic == 0 && dev->ascii == 0)
    {
        /* Read first 160 bytes of file into the buffer */
        len = fread(buf, 1, sizeof(buf), dev->fh);
        if (len < 0)
        {
            /* Handle read error condition */
            logmsg (_("HHCRD014E Error reading file %s: %s\n"),
                    dev->filename, strerror(errno));

            /* Close the file */
            fclose(dev->fh);
            dev->fd = -1;
            dev->fh = NULL;

            /* Set unit check with equipment check */
            dev->sense[0] = SENSE_EC;
            *unitstat = CSW_CE | CSW_DE | CSW_UC;
            return -1;
        }

        /* Assume ASCII format if first 160 bytes contain only ASCII
           characters, carriage return, line feed, tab, or EOF */
        for (i = 0, dev->ascii = 1; i < len && buf[i] != '\x1A'; i++)
        {
            if ((buf[i] < 0x20 || buf[i] > 0x7F)
                && buf[i] != '\r' && buf[i] != '\n'
                && buf[i] != '\t')
            {
                dev->ascii = 0;
                dev->ebcdic = 1;
                break;
            }
        } /* end for(i) */

        /* Rewind to start of file */
        rc = fseek (dev->fh, 0, SEEK_SET);
        if (rc < 0)
        {
            /* Handle seek error condition */
            logmsg (_("HHCRD015E Seek error in file %s: %s\n"),
                    dev->filename, strerror(errno));

            /* Close the file */
            fclose (dev->fh);
            dev->fd = -1;
            dev->fh = NULL;

            /* Set unit check with equipment check */
            dev->sense[0] = SENSE_EC;
            *unitstat = CSW_CE | CSW_DE | CSW_UC;
            return -1;
        }

    } /* end if(auto-detect) */

    ASSERT(dev->fd != -1 && dev->fh);

    return 0;
} /* end function open_cardrdr */

/*-------------------------------------------------------------------*/
/* Read an 80-byte EBCDIC card image into the device buffer          */
/*-------------------------------------------------------------------*/
static int read_ebcdic ( DEVBLK *dev, BYTE *unitstat )
{
int     rc;                             /* Return code               */

    /* Read 80 bytes of card image data into the device buffer */
    rc = fread(dev->buf, 1, CARD_SIZE, dev->fh);

    if ((rc > 0) && (rc < CARD_SIZE) && dev->autopad)
    {
        memset(&dev->buf[rc], 0, CARD_SIZE - rc);
        rc = CARD_SIZE;
    }
    else if (feof(dev->fh)) /* End of file */
    {

      /* Return unit exception or intervention required */
      if (dev->rdreof)
        {
          *unitstat = CSW_CE | CSW_DE | CSW_UX;
        }
      else
        {
          dev->sense[0] = SENSE_IR;
          dev->sense[1] = SENSE1_RDR_RAIC; /* Retry when IntReq Cleared */
          *unitstat = CSW_CE | CSW_DE | CSW_UC;
        }

      /* Close the file and clear the file name and flags */

      if (clear_cardrdr(dev) != 0)
        {
          /* Set unit check with equipment check */
          dev->sense[0] = SENSE_EC;
          *unitstat = CSW_CE | CSW_DE | CSW_UC;
          return -1;
        }

      return -2;
    }

    /* Handle read error condition */
    if (rc < CARD_SIZE)
    {
        if (rc < 0)
            logmsg (_("HHCRD016E Error reading file %s: %s\n"),
                    dev->filename, strerror(errno));
        else
            logmsg (_("HHCRD017E Unexpected end of file on %s\n"),
                    dev->filename);

        /* Set unit check with equipment check */
        dev->sense[0] = SENSE_EC;
        *unitstat = CSW_CE | CSW_DE | CSW_UC;
        return -1;
    }

    return 0;
} /* end function read_ebcdic */


/*-------------------------------------------------------------------*/
/* Read a variable length ASCII card image into the device buffer    */
/*-------------------------------------------------------------------*/
static int read_ascii ( DEVBLK *dev, BYTE *unitstat )
{
int     rc;                             /* Return code               */
int     i;                              /* Array subscript           */
BYTE    c;                              /* Input character           */

    /* Prefill the card image with EBCDIC blanks */
    memset (dev->buf, HEX40, CARD_SIZE);

    /* Read up to 80 bytes into device buffer */
    for (i = 0; ; )
    {
        /* Read next byte of card image */
        rc = getc(dev->fh);
        c = (BYTE)rc;

        /* Handle end-of-file condition */
        if (rc == EOF || c == '\x1A')
        {
            /* End of record if there is any data in buffer */
            if (i > 0) break;

            /* Return unit exception or intervention required */
            if (dev->rdreof)
            {
                *unitstat = CSW_CE | CSW_DE | CSW_UX;
            }
            else
            {
                dev->sense[0] = SENSE_IR;
                dev->sense[1] = SENSE1_RDR_RAIC; /* Retry when IntReq Cleared */
                *unitstat = CSW_CE | CSW_DE | CSW_UC;
            }

            /* Close the file and clear the file name and flags */
            if (clear_cardrdr(dev) != 0)
            {
                /* Set unit check with equipment check */
                dev->sense[0] = SENSE_EC;
                *unitstat = CSW_CE | CSW_DE | CSW_UC;
                return -1;
            }

            return -2;
        }

        /* Handle read error condition */
        if (rc < 0)
        {
            logmsg (_("HHCRD018E Error reading file %s: %s\n"),
                    dev->filename, strerror(errno));

            /* Set unit check with equipment check */
            dev->sense[0] = SENSE_EC;
            *unitstat = CSW_CE | CSW_DE | CSW_UC;
            return -1;
        }

        /* Ignore carriage return */
        if (c == '\r') continue;

        /* Line-feed indicates end of variable length record */
        if (c == '\n') break;

        /* Expand tabs to spaces */
        if (c == '\t')
        {
            do {i++;} while ((i & 7) && (i < CARD_SIZE));
            continue;
        }

        /* Test for overlength record */
        if (i >= CARD_SIZE)
        {
            /* Ignore excess characters if trunc option specified */
            if (dev->trunc) continue;

            logmsg (_("HHCRD019E Card image exceeds %d bytes in file %s\n"),
                    CARD_SIZE, dev->filename);

            /* Set unit check with data check */
            dev->sense[0] = SENSE_DC;
            *unitstat = CSW_CE | CSW_DE | CSW_UC;
            return -1;
        }

        /* Convert character to EBCDIC and store in device buffer */
        dev->buf[i++] = host_to_guest(c);

    } /* end for(i) */

    return 0;
} /* end function read_ascii */


/*-------------------------------------------------------------------*/
/* Execute a Channel Command Word                                    */
/*-------------------------------------------------------------------*/
static void cardrdr_execute_ccw ( DEVBLK *dev, BYTE code, BYTE flags,
        BYTE chained, U16 count, BYTE prevcode, int ccwseq,
        BYTE *iobuf, BYTE *more, BYTE *unitstat, U16 *residual )
{
int     rc;                             /* Return code               */
int     num;                            /* Number of bytes to move   */

    UNREFERENCED(flags);
    UNREFERENCED(prevcode);
    UNREFERENCED(ccwseq);

    /* Open the device file if necessary */
    if ((dev->fd < 0 || !dev->fh) && !IS_CCW_SENSE(code))
    {
        rc = open_cardrdr (dev, unitstat);
        if (rc) return;
    }

    /* Turn all read/feed commands into read, feed, select stacker 1 */
    if ((code & 0x17) == 0x02) code = 0x02;

    /* Process depending on CCW opcode */
    switch (code) {

    case 0x02:
    /*---------------------------------------------------------------*/
    /* READ                                                          */
    /*---------------------------------------------------------------*/
        /* Read next card if not data-chained from previous CCW */
        if ((chained & CCW_FLAGS_CD) == 0)
        {
            for (;;)
            {
                /* Read ASCII or EBCDIC card image */
                if (dev->ascii)
                        rc = read_ascii (dev, unitstat);
                else
                        rc = read_ebcdic (dev, unitstat);

                if (0
                        || rc != -2
                        || !dev->multifile
                        || open_cardrdr (dev, unitstat) != 0
                        )
                break;
            }

            /* Return error status if read was unsuccessful */
            if (rc) break;

            /* Initialize number of bytes in current card */
            dev->cardpos = 0;
            dev->cardrem = CARD_SIZE;

        } /* end if(!data-chained) */

        /* Calculate number of bytes to read and set residual count */
        num = (count < dev->cardrem) ? count : dev->cardrem;
        *residual = count - num;
        if (count < dev->cardrem) *more = 1;

        /* Copy data from card image buffer into channel buffer */
        memcpy (iobuf, dev->buf + dev->cardpos, num);

        /* Update number of bytes remaining in card image buffer */
        dev->cardpos += num;
        dev->cardrem -= num;

        /* Return normal status */
        *unitstat = CSW_CE | CSW_DE;
        break;

    case 0x03:
    /*---------------------------------------------------------------*/
    /* CONTROL NO-OPERATION                                          */
    /*---------------------------------------------------------------*/
        *residual = 0;
        *unitstat = CSW_CE | CSW_DE;
        break;

    case 0x04:
    /*---------------------------------------------------------------*/
    /* SENSE                                                         */
    /*---------------------------------------------------------------*/
        /* Calculate residual byte count */
        num = (count < dev->numsense) ? count : dev->numsense;
        *residual = count - num;
        if (count < dev->numsense) *more = 1;

        /* If sense is clear AND filename = "" OR sockdev and fd=-1 */
        /* Put an IR sense - so that an unsolicited sense can see the intreq */
        if(dev->sense[0]==0)
        {
            if(dev->filename[0]==0x00 ||
                    (dev->bs && dev->fd==-1))
            {
                dev->sense[0] = SENSE_IR;
                dev->sense[1] = SENSE1_RDR_RAIC; /* Retry when IntReq Cleared */
            }
        }

        /* Copy device sense bytes to channel I/O buffer */
        memcpy (iobuf, dev->sense, num);

        /* Clear the device sense bytes */
        memset (dev->sense, 0, sizeof(dev->sense));

        /* Return unit status */
        *unitstat = CSW_CE | CSW_DE;
        break;

    case 0xE4:
    /*---------------------------------------------------------------*/
    /* SENSE ID                                                      */
    /*---------------------------------------------------------------*/
        /* Calculate residual byte count */
        num = (count < dev->numdevid) ? count : dev->numdevid;
        *residual = count - num;
        if (count < dev->numdevid) *more = 1;

        /* Copy device identifier bytes to channel I/O buffer */
        memcpy (iobuf, dev->devid, num);

        /* Return unit status */
        *unitstat = CSW_CE | CSW_DE;
        break;

    default:
    /*---------------------------------------------------------------*/
    /* INVALID OPERATION                                             */
    /*---------------------------------------------------------------*/
        /* Set command reject sense byte, and unit check status */
        dev->sense[0] = SENSE_CR;
        *unitstat = CSW_CE | CSW_DE | CSW_UC;

    } /* end switch(code) */

} /* end function cardrdr_execute_ccw */


#if defined(OPTION_DYNAMIC_LOAD)
static
#endif
DEVHND cardrdr_device_hndinfo = {
        &cardrdr_init_handler,
        &cardrdr_execute_ccw,
        &cardrdr_close_device,
        &cardrdr_query_device,
        NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
};

/* Libtool static name colision resolution */
/* note : lt_dlopen will look for symbol & modulename_LTX_symbol */
#if !defined(HDL_BUILD_SHARED) && defined(HDL_USE_LIBTOOL)
#define hdl_ddev hdt3505_LTX_hdl_ddev
#define hdl_depc hdt3505_LTX_hdl_depc
#define hdl_reso hdt3505_LTX_hdl_reso
#define hdl_init hdt3505_LTX_hdl_init
#define hdl_fini hdt3505_LTX_hdl_fini
#endif


#if defined(OPTION_DYNAMIC_LOAD)
HDL_DEPENDENCY_SECTION;
{
     HDL_DEPENDENCY(HERCULES);
     HDL_DEPENDENCY(DEVBLK);
     HDL_DEPENDENCY(SYSBLK);
}
END_DEPENDENCY_SECTION;


#if defined(WIN32) && !defined(HDL_USE_LIBTOOL)
#undef sysblk
HDL_RESOLVER_SECTION;
{
    HDL_RESOLVE_PTRVAR( psysblk, sysblk );
}
END_RESOLVER_SECTION;
#endif


HDL_DEVICE_SECTION;
{
    HDL_DEVICE(1442, cardrdr_device_hndinfo );
    HDL_DEVICE(2501, cardrdr_device_hndinfo );
    HDL_DEVICE(3505, cardrdr_device_hndinfo );
}
END_DEVICE_SECTION;
#endif