/* i1401_cd.c: IBM 1402 card reader/punch

   Copyright (c) 1993-2008, Robert M. Supnik

   Permission is hereby granted, free of charge, to any person obtaining a
   copy of this software and associated documentation files (the "Software"),
   to deal in the Software without restriction, including without limitation
   the rights to use, copy, modify, merge, publish, distribute, sublicense,
   and/or sell copies of the Software, and to permit persons to whom the
   Software is furnished to do so, subject to the following conditions:

   The above copyright notice and this permission notice shall be included in
   all copies or substantial portions of the Software.

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
   IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

   Except as contained in this notice, the name of Robert M Supnik shall not be
   used in advertising or otherwise to promote the sale, use or other dealings
   in this Software without prior written authorization from Robert M Supnik.

   cdr          card reader
   cdp          card punch
   stack        stackers (5 units)
        0       normal
        1       1
        2       2/8
        3       unused
        4       4

   Cards are represented as ASCII text streams terminated by newlines.
   This allows cards to be created and edited as normal files.

   28-Jun-07    RMS     Added support for SS overlap modifiers
   19-Jan-07    RMS     Added UNIT_TEXT flag
   20-Sep-05    RMS     Revised for new code tables, compatible colbinary treatment
   30-Aug-05    RMS     Fixed read, punch to ignore modifier on 1,4 char inst
                        (reported by Van Snyder)
   14-Nov-04    WVS     Added column binary support
   25-Apr-03    RMS     Revised for extended file support
   30-May-02    RMS     Widened POS to 32b
   30-Jan-02    RMS     New zero footprint card bootstrap from Van Snyder
   29-Nov-01    RMS     Added read only unit support
   13-Apr-01    RMS     Revised for register arrays
*/

#include "i1401_defs.h"
#include <ctype.h>

#define UNIT_V_PCH      (UNIT_V_UF + 0)                 /* output conv */
#define UNIT_PCH        (1 << UNIT_V_PCH)

extern uint8 M[];
extern int32 ind[64], ssa, iochk;
extern int32 conv_old;

int32 s1sel, s2sel, s4sel, s8sel;
char rbuf[2 * CBUFSIZE];                                /* > CDR_WIDTH */
t_stat cdr_svc (UNIT *uptr);
t_stat cdr_boot (int32 unitno, DEVICE *dptr);
t_stat cdr_attach (UNIT *uptr, char *cptr);
t_stat cd_reset (DEVICE *dptr);
int32 bcd2asc (int32 c, UNIT *uptr);
char colbin_to_bcd (uint32 cb);

/* Card reader data structures

   cdr_dev      CDR descriptor
   cdr_unit     CDR unit descriptor
   cdr_reg      CDR register list
*/

UNIT cdr_unit = {
    UDATA (&cdr_svc, UNIT_SEQ+UNIT_ATTABLE+UNIT_ROABLE+UNIT_TEXT, 0), 100
    };

REG cdr_reg[] = {
    { FLDATA (LAST, ind[IN_LST], 0) },
    { FLDATA (ERR, ind[IN_READ], 0) },
    { FLDATA (S1, s1sel, 0) },
    { FLDATA (S2, s2sel, 0) },
    { DRDATA (POS, cdr_unit.pos, T_ADDR_W), PV_LEFT },
    { DRDATA (TIME, cdr_unit.wait, 24), PV_LEFT },
    { BRDATA (BUF, rbuf, 8, 8, CDR_WIDTH) },
    { NULL }
    };

DEVICE cdr_dev = {
    "CDR", &cdr_unit, cdr_reg, NULL,
    1, 10, 31, 1, 8, 7,
    NULL, NULL, &cd_reset,
    &cdr_boot, &cdr_attach, NULL
    };

/* CDP data structures

   cdp_dev      CDP device descriptor
   cdp_unit     CDP unit descriptor
   cdp_reg      CDP register list
*/

UNIT cdp_unit = {
    UDATA (NULL, UNIT_SEQ+UNIT_ATTABLE+UNIT_TEXT, 0)
    };

REG cdp_reg[] = {
    { FLDATA (ERR, ind[IN_PNCH], 0) },
    { FLDATA (S4, s4sel, 0) },
    { FLDATA (S8, s8sel, 0) },
    { DRDATA (POS, cdp_unit.pos, T_ADDR_W), PV_LEFT },
    { NULL }
    };

MTAB cdp_mod[] = {
    { UNIT_PCH, 0,        "business set", "BUSINESS" },
    { UNIT_PCH, UNIT_PCH, "Fortran set", "FORTRAN" },
    { 0 }
    };

DEVICE cdp_dev = {
    "CDP", &cdp_unit, cdp_reg, cdp_mod,
    1, 10, 31, 1, 8, 7,
    NULL, NULL, &cd_reset,
    NULL, NULL, NULL
    };

/* Stacker data structures

   stack_dev    STACK device descriptor
   stack_unit   STACK unit descriptors
   stack_reg    STACK register list
*/

UNIT stack_unit[] = {
    { UDATA (NULL, UNIT_SEQ+UNIT_ATTABLE+UNIT_TEXT, 0) },
    { UDATA (NULL, UNIT_SEQ+UNIT_ATTABLE+UNIT_TEXT, 0) },
    { UDATA (NULL, UNIT_SEQ+UNIT_ATTABLE+UNIT_TEXT, 0) },
    { UDATA (NULL, UNIT_DIS, 0) },                      /* unused */
    { UDATA (NULL, UNIT_SEQ+UNIT_ATTABLE+UNIT_TEXT, 0) }
    };

REG stack_reg[] = {
    { DRDATA (POS0, stack_unit[0].pos, T_ADDR_W), PV_LEFT },
    { DRDATA (POS1, stack_unit[1].pos, T_ADDR_W), PV_LEFT },
    { DRDATA (POS28, stack_unit[2].pos, T_ADDR_W), PV_LEFT },
    { DRDATA (POS4, stack_unit[4].pos, T_ADDR_W), PV_LEFT },
    { NULL }
    };

DEVICE stack_dev = {
    "STKR", stack_unit, stack_reg, cdp_mod,
    5, 10, 31, 1, 8, 7,
    NULL, NULL, &cd_reset,
    NULL, NULL, NULL
    };

/* Card read routine

   Modifiers have been checked by the caller
   C modifier is recognized (column binary is implemented)
*/

t_stat read_card (int32 ilnt, int32 mod)
{
int32 i, cbn, c1, c2;
t_stat r;

if (sim_is_active (&cdr_unit)) {                        /* busy? */
    sim_cancel (&cdr_unit);                             /* cancel */
    if (r = cdr_svc (&cdr_unit))                        /* process */
        return r;
    }
if ((cdr_unit.flags & UNIT_ATT) == 0)                   /* attached? */
    return SCPE_UNATT;
ind[IN_READ] = ind[IN_LST] = s1sel = s2sel = 0;         /* default stacker */
cbn = ((ilnt == 2) || (ilnt == 5)) && (mod == BCD_C);   /* col binary? */
for (i = 0; i < 2 * CBUFSIZE; i++)                      /* clear extended buf */
    rbuf[i] = 0;
fgets (rbuf, (cbn)? 2 * CBUFSIZE: CBUFSIZE,             /* rd bin/char card */
     cdr_unit.fileref);
if (feof (cdr_unit.fileref))                            /* eof? */
    return STOP_NOCD;
if (ferror (cdr_unit.fileref)) {                        /* error? */
    ind[IN_READ] = 1;  
    perror ("Card reader I/O error");
    clearerr (cdr_unit.fileref);
    if (iochk)
        return SCPE_IOERR;
    return SCPE_OK;
    }
cdr_unit.pos = ftell (cdr_unit.fileref);                /* update position */
if (ssa) {                                              /* if last cd on */
    getc (cdr_unit.fileref);                            /* see if more */
    if (feof (cdr_unit.fileref))                        /* eof? set flag */
        ind[IN_LST] = 1;
    fseek (cdr_unit.fileref, cdr_unit.pos, SEEK_SET);
    }
if (cbn) {                                              /* column binary */
    for (i = 0; i < CDR_WIDTH; i++) {
        if (conv_old) {
            c1 = ascii2bcd (rbuf[i]);
            c2 = ascii2bcd (rbuf[CDR_WIDTH + i]);
            }
        else {
            c1 = ascii2bcd (rbuf[2 * i]);
            c2 = ascii2bcd (rbuf[(2 * i) + 1]);
            }
        M[CD_CBUF1 + i] = (M[CD_CBUF1 + i] & WM) | c1;
        M[CD_CBUF2 + i] = (M[CD_CBUF2 + i] & WM) | c2;
        M[CDR_BUF + i] = colbin_to_bcd ((c1 << 6) | c2);
        }                                               /* end for i */
    }                                                   /* end if col bin */
else {                                                  /* normal read */
    for (i = 0; i < CDR_WIDTH; i++) {                   /* cvt to BCD */
        rbuf[i] = ascii2bcd (rbuf[i]);
        M[CDR_BUF + i] = (M[CDR_BUF + i] & WM) | rbuf[i];
        }
    }
M[CDR_BUF - 1] = 060;                                   /* mem mark */
sim_activate (&cdr_unit, cdr_unit.wait);                /* activate */
return SCPE_OK;
}

/* Card reader service.  If a stacker select is active, copy to the
   selected stacker.  Otherwise, copy to the normal stacker.  If the
   unit is unattached, simply exit.
*/

t_stat cdr_svc (UNIT *uptr)
{
int32 i;

if (s1sel)                                              /* stacker 1? */
    uptr = &stack_unit[1];
else if (s2sel)                                         /* stacker 2? */
    uptr = &stack_unit[2];
else uptr = &stack_unit[0];                             /* then default */
if ((uptr->flags & UNIT_ATT) == 0)                      /* attached? */
    return SCPE_OK;
for (i = 0; i < CDR_WIDTH; i++)
    rbuf[i] = bcd2ascii (rbuf[i], uptr->flags & UNIT_PCH);
for (i = CDR_WIDTH - 1; (i >= 0) && (rbuf[i] == ' '); i--)
    rbuf[i] = 0;
rbuf[CDR_WIDTH] = 0;                                    /* null at end */
fputs (rbuf, uptr->fileref);                            /* write card */
fputc ('\n', uptr->fileref);                            /* plus new line */
uptr->pos = ftell (uptr->fileref);                      /* update position */
if (ferror (uptr->fileref)) {                           /* error? */
    perror ("Card stacker I/O error");
    clearerr (uptr->fileref);
    if (iochk)
        return SCPE_IOERR;
    }
return SCPE_OK;
}

/* Card punch routine

   Modifiers have been checked by the caller
   C modifier is recognized (column binary is implemented)
*/

t_stat punch_card (int32 ilnt, int32 mod)
{
int32 i, cbn, c1, c2;
static char pbuf[(2 * CDP_WIDTH) + 1];                  /* + null */
t_bool use_h;
UNIT *uptr;

if (s8sel)                                              /* stack 8? */
    uptr = &stack_unit[2];
else if (s4sel)                                         /* stack 4? */
    uptr = &stack_unit[4];
else uptr = &cdp_unit;                                  /* normal output */
if ((uptr->flags & UNIT_ATT) == 0)                      /* attached? */
    return SCPE_UNATT;
use_h = uptr->flags & UNIT_PCH;
ind[IN_PNCH] = s4sel = s8sel = 0;                       /* clear flags */
cbn = ((ilnt == 2) || (ilnt == 5)) && (mod == BCD_C);   /* col binary? */

M[CDP_BUF - 1] = 012;                                   /* set prev loc */
if (cbn) {                                              /* column binary */
    for (i = 0; i < CDP_WIDTH; i++) {
        c1 = bcd2ascii (M[CD_CBUF1 + i] & CHAR, use_h);
        c2 = bcd2ascii (M[CD_CBUF2 + i] & CHAR, use_h);
        if (conv_old) {
            pbuf[i] = c1;
            pbuf[i + CDP_WIDTH] = c2;
            }
        else {
            pbuf[2 * i] = c1;
            pbuf[(2 * i) + 1] = c2;
            }
        }
    for (i = 2 * CDP_WIDTH - 1; (i >= 0) && (pbuf[i] == ' '); i--)
         pbuf[i] = 0;
    pbuf[2 * CDP_WIDTH] = 0;                            /* trailing null */
    }
else {                                                  /* normal */
    for (i = 0; i < CDP_WIDTH; i++)
        pbuf[i] = bcd2ascii (M[CDP_BUF + i] & CHAR, use_h);
    for (i = CDP_WIDTH - 1; (i >= 0) && (pbuf[i] == ' '); i--)
        pbuf[i] = 0;
    pbuf[CDP_WIDTH] = 0;                                /* trailing null */
    }
fputs (pbuf, uptr->fileref);                            /* output card */
fputc ('\n', uptr->fileref);                            /* plus new line */
uptr->pos = ftell (uptr->fileref);                      /* update position */
if (ferror (uptr->fileref)) {                           /* error? */
    perror ("Card punch I/O error");
    clearerr (uptr->fileref);
    if (iochk)
        return SCPE_IOERR;
    ind[IN_PNCH] = 1;
    }
return SCPE_OK;
}

/* Select stack routine

   Modifiers have been checked by the caller
   Modifiers are 1, 2, 4, 8 for the respective stack,
   or $, ., square for overlap control (ignored).
*/

t_stat select_stack (int32 ilnt, int32 mod)
{
if (mod == BCD_ONE)
    s1sel = 1;
else if (mod == BCD_TWO)
    s2sel = 1;
else if (mod == BCD_FOUR)
    s4sel = 1;
else if (mod == BCD_EIGHT)
    s8sel = 1;
return SCPE_OK;
}

/* Card reader/punch reset */

t_stat cd_reset (DEVICE *dptr)
{
ind[IN_LST] = ind[IN_READ] = ind[IN_PNCH] = 0;          /* clear indicators */
s1sel = s2sel = s4sel = s8sel = 0;                      /* clear stacker sel */
sim_cancel (&cdr_unit);                                 /* clear reader event */
return SCPE_OK;
}

/* Card reader attach */

t_stat cdr_attach (UNIT *uptr, char *cptr)
{
ind[IN_LST] = ind[IN_READ] = 0;                         /* clear last card */
return attach_unit (uptr, cptr);
}

/* Bootstrap routine */

#define BOOT_START 0
#define BOOT_LEN (sizeof (boot_rom) / sizeof (unsigned char))

static const unsigned char boot_rom[] = {
    OP_R + WM, OP_NOP + WM                              /* R, NOP */
    };

t_stat cdr_boot (int32 unitno, DEVICE *dptr)
{
int32 i;
extern int32 saved_IS;

for (i = 0; i < CDR_WIDTH; i++)                         /* clear buffer */
    M[CDR_BUF + i] = 0;
for (i = 0; i < BOOT_LEN; i++)
    M[BOOT_START + i] = boot_rom[i];
saved_IS = BOOT_START;
return SCPE_OK;
}

/* Column binary to BCD

   This is based on documentation in the IBM 1620 manual and may not be
   accurate for the 7094.  Each row (12,11,0,1..9) is interpreted as a bit
   pattern, and the appropriate bits are set.  (Double punches inclusive
   OR, eg, 1,8,9 is 9.)  On the 1620, double punch errors are detected;
   since the 7094 only reads column binary, double punches are ignored.

   Bit order, left to right, is 12, 11, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
   The for loop works right to left, so the table is reversed. */

static const char row_val[12] = {
    011, 010, 007, 006, 005, 004,
    003, 002, 001, 020, 040, 060
    };

char colbin_to_bcd (uint32 cb)
{
uint32 i;
char bcd;

for (i = 0, bcd = 0; i < 12; i++) {                     /* 'sum' rows */
    if (cb & (1 << i))
        bcd |= row_val[i];
    }
return bcd;
}
