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rts-formatted.c

     
 //! @file rts-formatted.c
 //! @author J. Marcel van der Veer
 
 //! @section Copyright
 //!
 //! This file is part of Algol68G - an Algol 68 compiler-interpreter.
 //! Copyright 2001-2023 J. Marcel van der Veer [algol68g@xs4all.nl].
 
 //! @section License
 //!
 //! This program is free software; you can redistribute it and/or modify it 
 //! under the terms of the GNU General Public License as published by the 
 //! Free Software Foundation; either version 3 of the License, or 
 //! (at your option) any later version.
 //!
 //! 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, see [http://www.gnu.org/licenses/].
 
 //! @section Synopsis 
 //!
 //! Formatted transput.
 
 #include "a68g.h"
 #include "a68g-genie.h"
 #include "a68g-frames.h"
 #include "a68g-prelude.h"
 #include "a68g-mp.h"
 #include "a68g-double.h"
 #include "a68g-transput.h"
 
 // Transput - Formatted transput.
 // In Algol68G, a value of mode FORMAT looks like a routine text. The value
 // comprises a pointer to its environment in the stack, and a pointer where the
 // format text is at in the syntax tree.
 
 #define INT_DIGITS "0123456789"
 #define BITS_DIGITS "0123456789abcdefABCDEF"
 #define INT_DIGITS_BLANK " 0123456789"
 #define BITS_DIGITS_BLANK " 0123456789abcdefABCDEF"
 #define SIGN_DIGITS " +-"
 
 //! @brief Convert to other radix, binary up to hexadecimal.
 
 BOOL_T convert_radix (NODE_T * p, UNSIGNED_T z, int radix, int width)
 {
   reset_transput_buffer (EDIT_BUFFER);
   if (radix < 2 || radix > 16) {
     radix = 16;
   }
   if (width > 0) {
     while (width > 0) {
       int digit = (int) (z % (UNSIGNED_T) radix);
       plusto_transput_buffer (p, digchar (digit), EDIT_BUFFER);
       width--;
       z /= (UNSIGNED_T) radix;
     }
     return z == 0;
   } else if (width == 0) {
     do {
       int digit = (int) (z % (UNSIGNED_T) radix);
       plusto_transput_buffer (p, digchar (digit), EDIT_BUFFER);
       z /= (UNSIGNED_T) radix;
     } while (z > 0);
     return A68_TRUE;
   } else {
     return A68_FALSE;
   }
 }
 
 //! @brief Handle format error event.
 
 void format_error (NODE_T * p, A68_REF ref_file, char *diag)
 {
   A68_FILE *f = FILE_DEREF (&ref_file);
   on_event_handler (p, FORMAT_ERROR_MENDED (f), ref_file);
   A68_BOOL z;
   POP_OBJECT (p, &z, A68_BOOL);
   if (VALUE (&z) == A68_FALSE) {
     diagnostic (A68_RUNTIME_ERROR, p, diag);
     exit_genie (p, A68_RUNTIME_ERROR);
   }
 }
 
 //! @brief Initialise processing of pictures.
 
 void initialise_collitems (NODE_T * p)
 {
 // Every picture has a counter that says whether it has not been used OR the number
 // of times it can still be used.
   for (; p != NO_NODE; FORWARD (p)) {
     if (IS (p, PICTURE)) {
       A68_COLLITEM *z = (A68_COLLITEM *) FRAME_LOCAL (A68_FP, OFFSET (TAX (p)));
       STATUS (z) = INIT_MASK;
       COUNT (z) = ITEM_NOT_USED;
     }
 // Don't dive into f, g, n frames and collections.
     if (!(IS (p, ENCLOSED_CLAUSE) || IS (p, COLLECTION))) {
       initialise_collitems (SUB (p));
     }
   }
 }
 
 //! @brief Initialise processing of format text.
 
 void open_format_frame (NODE_T * p, A68_REF ref_file, A68_FORMAT * fmt, BOOL_T embedded, BOOL_T init)
 {
 // Open a new frame for the format text and save for return to embedding one.
   A68_FILE *file = FILE_DEREF (&ref_file);
 // Integrity check.
   if ((STATUS (fmt) & SKIP_FORMAT_MASK) || (BODY (fmt) == NO_NODE)) {
     format_error (p, ref_file, ERROR_FORMAT_UNDEFINED);
   }
 // Ok, seems usable.
   NODE_T *dollar = SUB (BODY (fmt));
   OPEN_PROC_FRAME (dollar, ENVIRON (fmt));
   INIT_STATIC_FRAME (dollar);
 // Save old format.
   A68_FORMAT *save = (A68_FORMAT *) FRAME_LOCAL (A68_FP, OFFSET (TAX (dollar)));
   *save = (embedded == EMBEDDED_FORMAT ? FORMAT (file) : nil_format);
   FORMAT (file) = *fmt;
 // Reset all collitems.
   if (init) {
     initialise_collitems (dollar);
   }
 }
 
 //! @brief Handle end-of-format event.
 
 int end_of_format (NODE_T * p, A68_REF ref_file)
 {
 // Format-items return immediately to the embedding format text. The outermost
 //format text calls "on format end".
   A68_FILE *file = FILE_DEREF (&ref_file);
   NODE_T *dollar = SUB (BODY (&FORMAT (file)));
   A68_FORMAT *save = (A68_FORMAT *) FRAME_LOCAL (A68_FP, OFFSET (TAX (dollar)));
   if (IS_NIL_FORMAT (save)) {
 // Not embedded, outermost format: execute event routine.
     on_event_handler (p, FORMAT_END_MENDED (FILE_DEREF (&ref_file)), ref_file);
     A68_BOOL z;
     POP_OBJECT (p, &z, A68_BOOL);
     if (VALUE (&z) == A68_FALSE) {
 // Restart format.
       A68_FP = FRAME_POINTER (file);
       A68_SP = STACK_POINTER (file);
       open_format_frame (p, ref_file, &FORMAT (file), NOT_EMBEDDED_FORMAT, A68_TRUE);
     }
     return NOT_EMBEDDED_FORMAT;
   } else {
 // Embedded format, return to embedding format, cf. RR.
     CLOSE_FRAME;
     FORMAT (file) = *save;
     return EMBEDDED_FORMAT;
   }
 }
 
 //! @brief Return integral value of replicator.
 
 int get_replicator_value (NODE_T * p, BOOL_T check)
 {
   int z = 0;
   if (IS (p, STATIC_REPLICATOR)) {
     A68_INT u;
     if (genie_string_to_value_internal (p, M_INT, NSYMBOL (p), (BYTE_T *) & u) == A68_FALSE) {
       diagnostic (A68_RUNTIME_ERROR, p, ERROR_IN_DENOTATION, M_INT);
       exit_genie (p, A68_RUNTIME_ERROR);
     }
     z = VALUE (&u);
   } else if (IS (p, DYNAMIC_REPLICATOR)) {
     A68_INT u;
     GENIE_UNIT (NEXT_SUB (p));
     POP_OBJECT (p, &u, A68_INT);
     z = VALUE (&u);
   } else if (IS (p, REPLICATOR)) {
     z = get_replicator_value (SUB (p), check);
   }
 // Not conform RR as Andrew Herbert rightfully pointed out.
 //  if (check && z < 0) {
 //    diagnostic (A68_RUNTIME_ERROR, p, ERROR_FORMAT_INVALID_REPLICATOR);
 //    exit_genie (p, A68_RUNTIME_ERROR);
 //  }
   if (z < 0) {
     z = 0;
   }
   return z;
 }
 
 //! @brief Return first available pattern.
 
 NODE_T *scan_format_pattern (NODE_T * p, A68_REF ref_file)
 {
   for (; p != NO_NODE; FORWARD (p)) {
     if (IS (p, PICTURE_LIST)) {
       NODE_T *prio = scan_format_pattern (SUB (p), ref_file);
       if (prio != NO_NODE) {
         return prio;
       }
     }
     if (IS (p, PICTURE)) {
       NODE_T *picture = SUB (p);
       A68_COLLITEM *collitem = (A68_COLLITEM *) FRAME_LOCAL (A68_FP, OFFSET (TAX (p)));
       if (COUNT (collitem) != 0) {
         if (IS (picture, A68_PATTERN)) {
           COUNT (collitem) = 0; // This pattern is now done
           picture = SUB (picture);
           if (ATTRIBUTE (picture) != FORMAT_PATTERN) {
             return picture;
           } else {
             NODE_T *pat;
             A68_FORMAT z;
             A68_FILE *file = FILE_DEREF (&ref_file);
             GENIE_UNIT (NEXT_SUB (picture));
             POP_OBJECT (p, &z, A68_FORMAT);
             open_format_frame (p, ref_file, &z, EMBEDDED_FORMAT, A68_TRUE);
             pat = scan_format_pattern (SUB (BODY (&FORMAT (file))), ref_file);
             if (pat != NO_NODE) {
               return pat;
             } else {
               (void) end_of_format (p, ref_file);
             }
           }
         } else if (IS (picture, INSERTION)) {
           A68_FILE *file = FILE_DEREF (&ref_file);
           if (READ_MOOD (file)) {
             read_insertion (picture, ref_file);
           } else if (WRITE_MOOD (file)) {
             write_insertion (picture, ref_file, INSERTION_NORMAL);
           } else {
             ABEND (A68_TRUE, ERROR_INTERNAL_CONSISTENCY, __func__);
           }
           COUNT (collitem) = 0; // This insertion is now done
         } else if (IS (picture, REPLICATOR) || IS (picture, COLLECTION)) {
           BOOL_T siga = A68_TRUE;
           NODE_T *a68_select = NO_NODE;
           if (COUNT (collitem) == ITEM_NOT_USED) {
             if (IS (picture, REPLICATOR)) {
               COUNT (collitem) = get_replicator_value (SUB (p), A68_TRUE);
               siga = (BOOL_T) (COUNT (collitem) > 0);
               FORWARD (picture);
             } else {
               COUNT (collitem) = 1;
             }
             initialise_collitems (NEXT_SUB (picture));
           } else if (IS (picture, REPLICATOR)) {
             FORWARD (picture);
           }
           while (siga) {
 // Get format item from collection. If collection is done, but repitition is not,
 // then re-initialise the collection and repeat.
             a68_select = scan_format_pattern (NEXT_SUB (picture), ref_file);
             if (a68_select != NO_NODE) {
               return a68_select;
             } else {
               COUNT (collitem)--;
               siga = (BOOL_T) (COUNT (collitem) > 0);
               if (siga) {
                 initialise_collitems (NEXT_SUB (picture));
               }
             }
           }
         }
       }
     }
   }
   return NO_NODE;
 }
 
 //! @brief Return first available pattern.
 
 NODE_T *get_next_format_pattern (NODE_T * p, A68_REF ref_file, BOOL_T mood)
 {
 // "mood" can be WANT_PATTERN: pattern needed by caller, so perform end-of-format
 // if needed or SKIP_PATTERN: just emptying current pattern/collection/format.
   A68_FILE *file = FILE_DEREF (&ref_file);
   if (BODY (&FORMAT (file)) == NO_NODE) {
     diagnostic (A68_RUNTIME_ERROR, p, ERROR_FORMAT_EXHAUSTED);
     exit_genie (p, A68_RUNTIME_ERROR);
     return NO_NODE;
   } else {
     NODE_T *pat = scan_format_pattern (SUB (BODY (&FORMAT (file))), ref_file);
     if (pat == NO_NODE) {
       if (mood == WANT_PATTERN) {
         int z;
         do {
           z = end_of_format (p, ref_file);
           pat = scan_format_pattern (SUB (BODY (&FORMAT (file))), ref_file);
         } while (z == EMBEDDED_FORMAT && pat == NO_NODE);
         if (pat == NO_NODE) {
           diagnostic (A68_RUNTIME_ERROR, p, ERROR_FORMAT_EXHAUSTED);
           exit_genie (p, A68_RUNTIME_ERROR);
         }
       }
     }
     return pat;
   }
 }
 
 //! @brief Diagnostic_node in case mode does not match picture.
 
 void pattern_error (NODE_T * p, MOID_T * mode, int att)
 {
   diagnostic (A68_RUNTIME_ERROR, p, ERROR_FORMAT_CANNOT_TRANSPUT, mode, att);
   exit_genie (p, A68_RUNTIME_ERROR);
 }
 
 //! @brief Unite value at top of stack to NUMBER.
 
 void unite_to_number (NODE_T * p, MOID_T * mode, BYTE_T * item)
 {
   ADDR_T pop_sp = A68_SP;
   PUSH_UNION (p, mode);
   PUSH (p, item, (int) SIZE (mode));
   A68_SP = pop_sp + SIZE (M_NUMBER);
 }
 
 //! @brief Write a group of insertions.
 
 void write_insertion (NODE_T * p, A68_REF ref_file, MOOD_T mood)
 {
   for (; p != NO_NODE; FORWARD (p)) {
     write_insertion (SUB (p), ref_file, mood);
     if (IS (p, FORMAT_ITEM_L)) {
       plusab_transput_buffer (p, FORMATTED_BUFFER, NEWLINE_CHAR);
       write_purge_buffer (p, ref_file, FORMATTED_BUFFER);
     } else if (IS (p, FORMAT_ITEM_P)) {
       plusab_transput_buffer (p, FORMATTED_BUFFER, FORMFEED_CHAR);
       write_purge_buffer (p, ref_file, FORMATTED_BUFFER);
     } else if (IS (p, FORMAT_ITEM_X) || IS (p, FORMAT_ITEM_Q)) {
       plusab_transput_buffer (p, FORMATTED_BUFFER, BLANK_CHAR);
     } else if (IS (p, FORMAT_ITEM_Y)) {
       PUSH_REF (p, ref_file);
       PUSH_VALUE (p, -1, A68_INT);
       genie_set (p);
     } else if (IS (p, LITERAL)) {
       if (mood & INSERTION_NORMAL) {
         add_string_transput_buffer (p, FORMATTED_BUFFER, NSYMBOL (p));
       } else if (mood & INSERTION_BLANK) {
         int k = (int) strlen (NSYMBOL (p));
         for (int j = 1; j <= k; j++) {
           plusab_transput_buffer (p, FORMATTED_BUFFER, BLANK_CHAR);
         }
       }
     } else if (IS (p, REPLICATOR)) {
       int k = get_replicator_value (SUB (p), A68_TRUE);
       if (ATTRIBUTE (SUB_NEXT (p)) != FORMAT_ITEM_K) {
         for (int j = 1; j <= k; j++) {
           write_insertion (NEXT (p), ref_file, mood);
         }
       } else {
         int pos = get_transput_buffer_index (FORMATTED_BUFFER);
         for (int j = 1; j < (k - pos); j++) {
           plusab_transput_buffer (p, FORMATTED_BUFFER, BLANK_CHAR);
         }
       }
       return;
     }
   }
 }
 
 //! @brief Write string to file following current format.
 
 void write_string_pattern (NODE_T * p, MOID_T * mode, A68_REF ref_file, char **str)
 {
   for (; p != NO_NODE; FORWARD (p)) {
     if (IS (p, INSERTION)) {
       write_insertion (SUB (p), ref_file, INSERTION_NORMAL);
     } else if (IS (p, FORMAT_ITEM_A)) {
       if ((*str)[0] != NULL_CHAR) {
         plusab_transput_buffer (p, FORMATTED_BUFFER, (*str)[0]);
         (*str)++;
       } else {
         value_error (p, mode, ref_file);
       }
     } else if (IS (p, FORMAT_ITEM_S)) {
       if ((*str)[0] != NULL_CHAR) {
         (*str)++;
       } else {
         value_error (p, mode, ref_file);
       }
       return;
     } else if (IS (p, REPLICATOR)) {
       int k = get_replicator_value (SUB (p), A68_TRUE);
       for (int j = 1; j <= k; j++) {
         write_string_pattern (NEXT (p), mode, ref_file, str);
       }
       return;
     } else {
       write_string_pattern (SUB (p), mode, ref_file, str);
     }
   }
 }
 
 //! @brief Scan c_pattern.
 
 void scan_c_pattern (NODE_T * p, BOOL_T * right_align, BOOL_T * sign, int *width, int *after, int *letter)
 {
   if (IS (p, FORMAT_ITEM_ESCAPE)) {
     FORWARD (p);
   }
   if (IS (p, FORMAT_ITEM_MINUS)) {
     *right_align = A68_TRUE;
     FORWARD (p);
   } else {
     *right_align = A68_FALSE;
   }
   if (IS (p, FORMAT_ITEM_PLUS)) {
     *sign = A68_TRUE;
     FORWARD (p);
   } else {
     *sign = A68_FALSE;
   }
   if (IS (p, REPLICATOR)) {
     *width = get_replicator_value (SUB (p), A68_TRUE);
     FORWARD (p);
   }
   if (IS (p, FORMAT_ITEM_POINT)) {
     FORWARD (p);
   }
   if (IS (p, REPLICATOR)) {
     *after = get_replicator_value (SUB (p), A68_TRUE);
     FORWARD (p);
   }
   *letter = ATTRIBUTE (p);
 }
 
 //! @brief Write appropriate insertion from a choice pattern.
 
 void write_choice_pattern (NODE_T * p, A68_REF ref_file, int *count)
 {
   for (; p != NO_NODE; FORWARD (p)) {
     write_choice_pattern (SUB (p), ref_file, count);
     if (IS (p, PICTURE)) {
       (*count)--;
       if (*count == 0) {
         write_insertion (SUB (p), ref_file, INSERTION_NORMAL);
       }
     }
   }
 }
 
 //! @brief Write appropriate insertion from a boolean pattern.
 
 void write_boolean_pattern (NODE_T * p, A68_REF ref_file, BOOL_T z)
 {
   int k = (z ? 1 : 2);
   write_choice_pattern (p, ref_file, &k);
 }
 
 //! @brief Write value according to a general pattern.
 
 void write_number_generic (NODE_T * p, MOID_T * mode, BYTE_T * item, int mod)
 {
 // Push arguments.
   unite_to_number (p, mode, item);
   GENIE_UNIT (NEXT_SUB (p));
   A68_REF row;
   POP_REF (p, &row);
   A68_ARRAY *arr; A68_TUPLE *tup;
   GET_DESCRIPTOR (arr, tup, &row);
   int size = ROW_SIZE (tup);
   if (size > 0) {
     BYTE_T *base_address = DEREF (BYTE_T, &ARRAY (arr));
     for (int i = LWB (tup); i <= UPB (tup); i++) {
       int addr = INDEX_1_DIM (arr, tup, i);
       int arg = VALUE ((A68_INT *) & (base_address[addr]));
       PUSH_VALUE (p, arg, A68_INT);
     }
   }
 // Make a string.
   if (mod == FORMAT_ITEM_G) {
     switch (size) {
     case 1: {
         genie_whole (p);
         break;
       }
     case 2: {
         genie_fixed (p);
         break;
       }
     case 3: {
         genie_float (p);
         break;
       }
     default: {
         diagnostic (A68_RUNTIME_ERROR, p, ERROR_FORMAT_INTS_REQUIRED, M_INT);
         exit_genie (p, A68_RUNTIME_ERROR);
         break;
       }
     }
   } else if (mod == FORMAT_ITEM_H) {
     A68_INT a_width, a_after, a_expo, a_mult;
     STATUS (&a_width) = INIT_MASK;
     VALUE (&a_width) = 0;
     STATUS (&a_after) = INIT_MASK;
     VALUE (&a_after) = 0;
     STATUS (&a_expo) = INIT_MASK;
     VALUE (&a_expo) = 0;
     STATUS (&a_mult) = INIT_MASK;
     VALUE (&a_mult) = 0;
 // Set default values 
     int def_expo = 0;
     if (mode == M_REAL || mode == M_INT) {
       def_expo = A68_EXP_WIDTH + 1;
     } else if (mode == M_LONG_REAL || mode == M_LONG_INT) {
       def_expo = A68_LONG_EXP_WIDTH + 1;
     } else if (mode == M_LONG_LONG_REAL || mode == M_LONG_LONG_INT) {
       def_expo = A68_LONG_LONG_EXP_WIDTH + 1;
     }
     int def_mult = 3;
 // Pop user values 
     switch (size) {
     case 1: {
         POP_OBJECT (p, &a_after, A68_INT);
         VALUE (&a_width) = VALUE (&a_after) + def_expo + 4;
         VALUE (&a_expo) = def_expo;
         VALUE (&a_mult) = def_mult;
         break;
       }
     case 2: {
         POP_OBJECT (p, &a_mult, A68_INT);
         POP_OBJECT (p, &a_after, A68_INT);
         VALUE (&a_width) = VALUE (&a_after) + def_expo + 4;
         VALUE (&a_expo) = def_expo;
         break;
       }
     case 3: {
         POP_OBJECT (p, &a_mult, A68_INT);
         POP_OBJECT (p, &a_after, A68_INT);
         POP_OBJECT (p, &a_width, A68_INT);
         VALUE (&a_expo) = def_expo;
         break;
       }
     case 4: {
         POP_OBJECT (p, &a_mult, A68_INT);
         POP_OBJECT (p, &a_expo, A68_INT);
         POP_OBJECT (p, &a_after, A68_INT);
         POP_OBJECT (p, &a_width, A68_INT);
         break;
       }
     default: {
         diagnostic (A68_RUNTIME_ERROR, p, ERROR_FORMAT_INTS_REQUIRED, M_INT);
         exit_genie (p, A68_RUNTIME_ERROR);
         break;
       }
     }
     PUSH_VALUE (p, VALUE (&a_width), A68_INT);
     PUSH_VALUE (p, VALUE (&a_after), A68_INT);
     PUSH_VALUE (p, VALUE (&a_expo), A68_INT);
     PUSH_VALUE (p, VALUE (&a_mult), A68_INT);
     genie_real (p);
   }
   add_string_from_stack_transput_buffer (p, FORMATTED_BUFFER);
 }
 
 //! @brief Write %[-][+][w][.][d]s/d/i/f/e/b/o/x formats.
 
 void write_c_pattern (NODE_T * p, MOID_T * mode, BYTE_T * item, A68_REF ref_file)
 {
   ADDR_T pop_sp = A68_SP;
   BOOL_T right_align, sign, invalid;
   int width = 0, after = 0, letter;
   char *str = NO_TEXT;
   char tmp[2]; // In same scope as str!
   if (IS (p, CHAR_C_PATTERN)) {
     A68_CHAR *z = (A68_CHAR *) item;
     tmp[0] = (char) VALUE (z);
     tmp[1] = NULL_CHAR;
     str = (char *) &tmp;
     width = (int) strlen (str);
     scan_c_pattern (SUB (p), &right_align, &sign, &width, &after, &letter);
   } else if (IS (p, STRING_C_PATTERN)) {
     str = (char *) item;
     width = (int) strlen (str);
     scan_c_pattern (SUB (p), &right_align, &sign, &width, &after, &letter);
   } else if (IS (p, INTEGRAL_C_PATTERN)) {
     width = 0;
     scan_c_pattern (SUB (p), &right_align, &sign, &width, &after, &letter);
     unite_to_number (p, mode, item);
     PUSH_VALUE (p, (sign ? width : -width), A68_INT);
     str = whole (p);
   } else if (IS (p, FIXED_C_PATTERN) || IS (p, FLOAT_C_PATTERN) || IS (p, GENERAL_C_PATTERN)) {
     int att = ATTRIBUTE (p), expval = 0, expo = 0;
     if (att == FLOAT_C_PATTERN || att == GENERAL_C_PATTERN) {
       int digits = 0;
       if (mode == M_REAL || mode == M_INT) {
         width = A68_REAL_WIDTH + A68_EXP_WIDTH + 4;
         after = A68_REAL_WIDTH - 1;
         expo = A68_EXP_WIDTH + 1;
       } else if (mode == M_LONG_REAL || mode == M_LONG_INT) {
         width = A68_LONG_REAL_WIDTH + A68_LONG_EXP_WIDTH + 4;
         after = A68_LONG_REAL_WIDTH - 1;
         expo = A68_LONG_EXP_WIDTH + 1;
       } else if (mode == M_LONG_LONG_REAL || mode == M_LONG_LONG_INT) {
         width = A68_LONG_LONG_REAL_WIDTH + A68_LONG_LONG_EXP_WIDTH + 4;
         after = A68_LONG_LONG_REAL_WIDTH - 1;
         expo = A68_LONG_LONG_EXP_WIDTH + 1;
       }
       scan_c_pattern (SUB (p), &right_align, &sign, &digits, &after, &letter);
       if (digits == 0 && after > 0) {
         width = after + expo + 4;
       } else if (digits > 0) {
         width = digits;
       }
       unite_to_number (p, mode, item);
       PUSH_VALUE (p, (sign ? width : -width), A68_INT);
       PUSH_VALUE (p, after, A68_INT);
       PUSH_VALUE (p, expo, A68_INT);
       PUSH_VALUE (p, 1, A68_INT);
       str = real (p);
       A68_SP = pop_sp;
     }
     if (att == GENERAL_C_PATTERN) {
       char *expch = strchr (str, EXPONENT_CHAR);
       if (expch != NO_TEXT) {
         expval = (int) strtol (&(expch[1]), NO_VAR, 10);
       }
     }
     if ((att == FIXED_C_PATTERN) || (att == GENERAL_C_PATTERN && (expval > -4 && expval <= after))) {
       int digits = 0;
       if (mode == M_REAL || mode == M_INT) {
         width = A68_REAL_WIDTH + 2;
         after = A68_REAL_WIDTH - 1;
       } else if (mode == M_LONG_REAL || mode == M_LONG_INT) {
         width = A68_LONG_REAL_WIDTH + 2;
         after = A68_LONG_REAL_WIDTH - 1;
       } else if (mode == M_LONG_LONG_REAL || mode == M_LONG_LONG_INT) {
         width = A68_LONG_LONG_REAL_WIDTH + 2;
         after = A68_LONG_LONG_REAL_WIDTH - 1;
       }
       scan_c_pattern (SUB (p), &right_align, &sign, &digits, &after, &letter);
       if (digits == 0 && after > 0) {
         width = after + 2;
       } else if (digits > 0) {
         width = digits;
       }
       unite_to_number (p, mode, item);
       PUSH_VALUE (p, (sign ? width : -width), A68_INT);
       PUSH_VALUE (p, after, A68_INT);
       str = fixed (p);
       A68_SP = pop_sp;
     }
   } else if (IS (p, BITS_C_PATTERN)) {
     int radix = 10, nibble = 1;
     width = 0;
     scan_c_pattern (SUB (p), &right_align, &sign, &width, &after, &letter);
     if (letter == FORMAT_ITEM_B) {
       radix = 2;
       nibble = 1;
     } else if (letter == FORMAT_ITEM_O) {
       radix = 8;
       nibble = 3;
     } else if (letter == FORMAT_ITEM_X) {
       radix = 16;
       nibble = 4;
     }
     if (width == 0) {
       if (mode == M_BITS) {
         width = (int) ceil ((REAL_T) A68_BITS_WIDTH / (REAL_T) nibble);
       } else if (mode == M_LONG_BITS || mode == M_LONG_LONG_BITS) {
 #if (A68_LEVEL <= 2)
         width = (int) ceil ((REAL_T) get_mp_bits_width (mode) / (REAL_T) nibble);
 #else
         width = (int) ceil ((REAL_T) A68_LONG_BITS_WIDTH / (REAL_T) nibble);
 #endif
       }
     }
     if (mode == M_BITS) {
       A68_BITS *z = (A68_BITS *) item;
       reset_transput_buffer (EDIT_BUFFER);
       if (!convert_radix (p, VALUE (z), radix, width)) {
         errno = EDOM;
         value_error (p, mode, ref_file);
       }
       str = get_transput_buffer (EDIT_BUFFER);
     } else if (mode == M_LONG_BITS) {
 #if (A68_LEVEL >= 3)
       A68_LONG_BITS *z = (A68_LONG_BITS *) item;
       reset_transput_buffer (EDIT_BUFFER);
       if (!convert_radix_double (p, VALUE (z), radix, width)) {
         errno = EDOM;
         value_error (p, mode, ref_file);
       }
       str = get_transput_buffer (EDIT_BUFFER);
 #else
       int digits = DIGITS (mode);
       MP_T *u = (MP_T *) item;
       MP_T *v = nil_mp (p, digits);
       MP_T *w = nil_mp (p, digits);
       reset_transput_buffer (EDIT_BUFFER);
       if (!convert_radix_mp (p, u, radix, width, mode, v, w)) {
         errno = EDOM;
         value_error (p, mode, ref_file);
       }
       str = get_transput_buffer (EDIT_BUFFER);
 #endif
     } else if (mode == M_LONG_LONG_BITS) {
 #if (A68_LEVEL <= 2)
       int digits = DIGITS (mode);
       MP_T *u = (MP_T *) item;
       MP_T *v = nil_mp (p, digits);
       MP_T *w = nil_mp (p, digits);
       reset_transput_buffer (EDIT_BUFFER);
       if (!convert_radix_mp (p, u, radix, width, mode, v, w)) {
         errno = EDOM;
         value_error (p, mode, ref_file);
       }
       str = get_transput_buffer (EDIT_BUFFER);
 #endif
     }
   }
 // Did the conversion succeed?.
   if (IS (p, CHAR_C_PATTERN) || IS (p, STRING_C_PATTERN)) {
     invalid = A68_FALSE;
   } else {
     invalid = (strchr (str, ERROR_CHAR) != NO_TEXT);
   }
   if (invalid) {
     value_error (p, mode, ref_file);
     (void) error_chars (get_transput_buffer (FORMATTED_BUFFER), width);
   } else {
 // Align and output.
     if (width == 0) {
       add_string_transput_buffer (p, FORMATTED_BUFFER, str);
     } else {
       if (right_align == A68_TRUE) {
         while (str[0] == BLANK_CHAR) {
           str++;
         }
         int blanks = width - (int) strlen (str);
         if (blanks >= 0) {
           add_string_transput_buffer (p, FORMATTED_BUFFER, str);
           while (blanks--) {
             plusab_transput_buffer (p, FORMATTED_BUFFER, BLANK_CHAR);
           }
         } else {
           value_error (p, mode, ref_file);
           (void) error_chars (get_transput_buffer (FORMATTED_BUFFER), width);
         }
       } else {
         while (str[0] == BLANK_CHAR) {
           str++;
         }
         int blanks = width - (int) strlen (str);
         if (blanks >= 0) {
           while (blanks--) {
             plusab_transput_buffer (p, FORMATTED_BUFFER, BLANK_CHAR);
           }
           add_string_transput_buffer (p, FORMATTED_BUFFER, str);
         } else {
           value_error (p, mode, ref_file);
           (void) error_chars (get_transput_buffer (FORMATTED_BUFFER), width);
         }
       }
     }
   }
 }
 
 //! @brief Read one char from file.
 
 char read_single_char (NODE_T * p, A68_REF ref_file)
 {
   A68_FILE *file = FILE_DEREF (&ref_file);
   int ch = char_scanner (file);
   if (ch == EOF_CHAR) {
     end_of_file_error (p, ref_file);
   }
   return (char) ch;
 }
 
 //! @brief Scan n chars from file to input buffer.
 
 void scan_n_chars (NODE_T * p, int n, MOID_T * m, A68_REF ref_file)
 {
   (void) m;
   for (int k = 0; k < n; k++) {
     int ch = read_single_char (p, ref_file);
     plusab_transput_buffer (p, INPUT_BUFFER, (char) ch);
   }
 }
 
 //! @brief Read %[-][+][w][.][d]s/d/i/f/e/b/o/x formats.
 
 void read_c_pattern (NODE_T * p, MOID_T * mode, BYTE_T * item, A68_REF ref_file)
 {
   ADDR_T pop_sp = A68_SP;
   BOOL_T right_align, sign;
   int width, after, letter;
   reset_transput_buffer (INPUT_BUFFER);
   if (IS (p, CHAR_C_PATTERN)) {
     width = 0;
     scan_c_pattern (SUB (p), &right_align, &sign, &width, &after, &letter);
     if (width == 0) {
       genie_read_standard (p, mode, item, ref_file);
     } else {
       scan_n_chars (p, width, mode, ref_file);
       if (width > 1 && right_align == A68_FALSE) {
         for (; width > 1; width--) {
           (void) pop_char_transput_buffer (INPUT_BUFFER);
         }
       }
       genie_string_to_value (p, mode, item, ref_file);
     }
   } else if (IS (p, STRING_C_PATTERN)) {
     width = 0;
     scan_c_pattern (SUB (p), &right_align, &sign, &width, &after, &letter);
     if (width == 0) {
       genie_read_standard (p, mode, item, ref_file);
     } else {
       scan_n_chars (p, width, mode, ref_file);
       genie_string_to_value (p, mode, item, ref_file);
     }
   } else if (IS (p, INTEGRAL_C_PATTERN)) {
     if (mode != M_INT && mode != M_LONG_INT && mode != M_LONG_LONG_INT) {
       pattern_error (p, mode, ATTRIBUTE (p));
     } else {
       width = 0;
       scan_c_pattern (SUB (p), &right_align, &sign, &width, &after, &letter);
       if (width == 0) {
         genie_read_standard (p, mode, item, ref_file);
       } else {
         scan_n_chars (p, (sign != 0) ? width + 1 : width, mode, ref_file);
         genie_string_to_value (p, mode, item, ref_file);
       }
     }
   } else if (IS (p, FIXED_C_PATTERN) || IS (p, FLOAT_C_PATTERN) || IS (p, GENERAL_C_PATTERN)) {
     if (mode != M_REAL && mode != M_LONG_REAL && mode != M_LONG_LONG_REAL) {
       pattern_error (p, mode, ATTRIBUTE (p));
     } else {
       width = 0;
       scan_c_pattern (SUB (p), &right_align, &sign, &width, &after, &letter);
       if (width == 0) {
         genie_read_standard (p, mode, item, ref_file);
       } else {
         scan_n_chars (p, (sign != 0) ? width + 1 : width, mode, ref_file);
         genie_string_to_value (p, mode, item, ref_file);
       }
     }
   } else if (IS (p, BITS_C_PATTERN)) {
     if (mode != M_BITS && mode != M_LONG_BITS && mode != M_LONG_LONG_BITS) {
       pattern_error (p, mode, ATTRIBUTE (p));
     } else {
       int radix = 10;
       char *str;
       width = 0;
       scan_c_pattern (SUB (p), &right_align, &sign, &width, &after, &letter);
       if (letter == FORMAT_ITEM_B) {
         radix = 2;
       } else if (letter == FORMAT_ITEM_O) {
         radix = 8;
       } else if (letter == FORMAT_ITEM_X) {
         radix = 16;
       }
       str = get_transput_buffer (INPUT_BUFFER);
       if (width == 0) {
         A68_FILE *file = FILE_DEREF (&ref_file);
         int ch;
         ASSERT (snprintf (str, (size_t) TRANSPUT_BUFFER_SIZE, "%dr", radix) >= 0);
         set_transput_buffer_index (INPUT_BUFFER, (int) strlen (str));
         ch = char_scanner (file);
         while (ch != EOF_CHAR && (IS_SPACE (ch) || IS_NL_FF (ch))) {
           if (IS_NL_FF (ch)) {
             skip_nl_ff (p, &ch, ref_file);
           } else {
             ch = char_scanner (file);
           }
         }
         while (ch != EOF_CHAR && IS_XDIGIT (ch)) {
           plusab_transput_buffer (p, INPUT_BUFFER, (char) ch);
           ch = char_scanner (file);
         }
         unchar_scanner (p, file, (char) ch);
       } else {
         ASSERT (snprintf (str, (size_t) TRANSPUT_BUFFER_SIZE, "%dr", radix) >= 0);
         set_transput_buffer_index (INPUT_BUFFER, (int) strlen (str));
         scan_n_chars (p, width, mode, ref_file);
       }
       genie_string_to_value (p, mode, item, ref_file);
     }
   }
   A68_SP = pop_sp;
 }
 
 // INTEGRAL, REAL, COMPLEX and BITS patterns.
 
 //! @brief Count Z and D frames in a mould.
 
 void count_zd_frames (NODE_T * p, int *z)
 {
   for (; p != NO_NODE; FORWARD (p)) {
     if (IS (p, FORMAT_ITEM_D) || IS (p, FORMAT_ITEM_Z)) {
       (*z)++;
     } else if (IS (p, REPLICATOR)) {
       int k = get_replicator_value (SUB (p), A68_TRUE);
       for (int j = 1; j <= k; j++) {
         count_zd_frames (NEXT (p), z);
       }
       return;
     } else {
       count_zd_frames (SUB (p), z);
     }
   }
 }
 
 //! @brief Get sign from sign mould.
 
 NODE_T *get_sign (NODE_T * p)
 {
   for (; p != NO_NODE; FORWARD (p)) {
     NODE_T *q = get_sign (SUB (p));
     if (q != NO_NODE) {
       return q;
     } else if (IS (p, FORMAT_ITEM_PLUS) || IS (p, FORMAT_ITEM_MINUS)) {
       return p;
     }
   }
   return NO_NODE;
 }
 
 //! @brief Shift sign through Z frames until non-zero digit or D frame.
 
 void shift_sign (NODE_T * p, char **q)
 {
   for (; p != NO_NODE && (*q) != NO_TEXT; FORWARD (p)) {
     shift_sign (SUB (p), q);
     if (IS (p, FORMAT_ITEM_Z)) {
       if (((*q)[0] == '+' || (*q)[0] == '-') && (*q)[1] == '0') {
         char ch = (*q)[0];
         (*q)[0] = (*q)[1];
         (*q)[1] = ch;
         (*q)++;
       }
     } else if (IS (p, FORMAT_ITEM_D)) {
       (*q) = NO_TEXT;
     } else if (IS (p, REPLICATOR)) {
       int k = get_replicator_value (SUB (p), A68_TRUE);
       for (int j = 1; j <= k; j++) {
         shift_sign (NEXT (p), q);
       }
       return;
     }
   }
 }
 
 //! @brief Pad trailing blanks to integral until desired width.
 
 void put_zeroes_to_integral (NODE_T * p, int n)
 {
   for (; n > 0; n--) {
     plusab_transput_buffer (p, EDIT_BUFFER, '0');
   }
 }
 
 //! @brief Pad a sign to integral representation.
 
 void put_sign_to_integral (NODE_T * p, int sign)
 {
   NODE_T *sign_node = get_sign (SUB (p));
   if (IS (sign_node, FORMAT_ITEM_PLUS)) {
     plusab_transput_buffer (p, EDIT_BUFFER, (char) (sign >= 0 ? '+' : '-'));
   } else {
     plusab_transput_buffer (p, EDIT_BUFFER, (char) (sign >= 0 ? BLANK_CHAR : '-'));
   }
 }
 
 //! @brief Write point, exponent or plus-i-times symbol.
 
 void write_pie_frame (NODE_T * p, A68_REF ref_file, int att, int sym)
 {
   for (; p != NO_NODE; FORWARD (p)) {
     if (IS (p, INSERTION)) {
       write_insertion (p, ref_file, INSERTION_NORMAL);
     } else if (IS (p, att)) {
       write_pie_frame (SUB (p), ref_file, att, sym);
       return;
     } else if (IS (p, sym)) {
       add_string_transput_buffer (p, FORMATTED_BUFFER, NSYMBOL (p));
     } else if (IS (p, FORMAT_ITEM_S)) {
       return;
     }
   }
 }
 
 //! @brief Write sign when appropriate.
 
 void write_mould_put_sign (NODE_T * p, char **q)
 {
   if ((*q)[0] == '+' || (*q)[0] == '-' || (*q)[0] == BLANK_CHAR) {
     plusab_transput_buffer (p, FORMATTED_BUFFER, (*q)[0]);
     (*q)++;
   }
 }
 
 //! @brief Write character according to a mould.
 
 void add_char_mould (NODE_T * p, char ch, char **q)
 {
   if (ch != NULL_CHAR) {
     plusab_transput_buffer (p, FORMATTED_BUFFER, ch);
     (*q)++;
   }
 }
 
 //! @brief Write string according to a mould.
 
 void write_mould (NODE_T * p, A68_REF ref_file, int type, char **q, MOOD_T * mood)
 {
   for (; p != NO_NODE; FORWARD (p)) {
 // Insertions are inserted straight away. Note that we can suppress them using "mood", which is not standard A68.
     if (IS (p, INSERTION)) {
       write_insertion (SUB (p), ref_file, *mood);
     } else {
       write_mould (SUB (p), ref_file, type, q, mood);
 // Z frames print blanks until first non-zero digits comes.
       if (IS (p, FORMAT_ITEM_Z)) {
         write_mould_put_sign (p, q);
         if ((*q)[0] == '0') {
           if (*mood & DIGIT_BLANK) {
             add_char_mould (p, BLANK_CHAR, q);
             *mood = (*mood & ~INSERTION_NORMAL) | INSERTION_BLANK;
           } else if (*mood & DIGIT_NORMAL) {
             add_char_mould (p, '0', q);
             *mood = (MOOD_T) (DIGIT_NORMAL | INSERTION_NORMAL);
           }
         } else {
           add_char_mould (p, (*q)[0], q);
           *mood = (MOOD_T) (DIGIT_NORMAL | INSERTION_NORMAL);
         }
       }
 // D frames print a digit.
       else if (IS (p, FORMAT_ITEM_D)) {
         write_mould_put_sign (p, q);
         add_char_mould (p, (*q)[0], q);
         *mood = (MOOD_T) (DIGIT_NORMAL | INSERTION_NORMAL);
       }
 // Suppressible frames.
       else if (IS (p, FORMAT_ITEM_S)) {
 // Suppressible frames are ignored in a sign-mould.
         if (type == SIGN_MOULD) {
           write_mould (NEXT (p), ref_file, type, q, mood);
         } else if (type == INTEGRAL_MOULD) {
           if ((*q)[0] != NULL_CHAR) {
             (*q)++;
           }
         }
         return;
       }
 // Replicator.
       else if (IS (p, REPLICATOR)) {
         int k = get_replicator_value (SUB (p), A68_TRUE);
         for (int j = 1; j <= k; j++) {
           write_mould (NEXT (p), ref_file, type, q, mood);
         }
         return;
       }
     }
   }
 }
 
 //! @brief Write INT value using int pattern.
 
 void write_integral_pattern (NODE_T * p, MOID_T * mode, MOID_T * root, BYTE_T * item, A68_REF ref_file)
 {
   errno = 0;
   if (!(mode == M_INT || mode == M_LONG_INT || mode == M_LONG_LONG_INT)) {
     pattern_error (p, root, ATTRIBUTE (p));
   } else {
     ADDR_T pop_sp = A68_SP;
     char *str = "*";
     int width = 0, sign = 0;
     MOOD_T mood;
 // Dive into the pattern if needed.
     if (IS (p, INTEGRAL_PATTERN)) {
       p = SUB (p);
     }
 // Find width.
     count_zd_frames (p, &width);
 // Make string.
     reset_transput_buffer (EDIT_BUFFER);
     if (mode == M_INT) {
       A68_INT *z = (A68_INT *) item;
       sign = SIGN (VALUE (z));
       str = sub_whole (p, ABS (VALUE (z)), width);
     } else if (mode == M_LONG_INT) {
 #if (A68_LEVEL >= 3)
       A68_LONG_INT *z = (A68_LONG_INT *) item;
       DOUBLE_NUM_T w = VALUE (z);
       sign = sign_double_int (w);
       str = long_sub_whole_double (p, abs_double_int (w), width);
 #else
       MP_T *z = (MP_T *) item;
       sign = MP_SIGN (z);
       MP_DIGIT (z, 1) = ABS (MP_DIGIT (z, 1));
       str = long_sub_whole (p, z, DIGITS (mode), width);
 #endif
     } else if (mode == M_LONG_LONG_INT) {
       MP_T *z = (MP_T *) item;
       sign = MP_SIGN (z);
       MP_DIGIT (z, 1) = ABS (MP_DIGIT (z, 1));
       str = long_sub_whole (p, z, DIGITS (mode), width);
     }
 // Edit string and output.
     if (strchr (str, ERROR_CHAR) != NO_TEXT) {
       value_error (p, root, ref_file);
     }
     if (IS (p, SIGN_MOULD)) {
       put_sign_to_integral (p, sign);
     } else if (sign < 0) {
       value_sign_error (p, root, ref_file);
     }
     put_zeroes_to_integral (p, width - (int) strlen (str));
     add_string_transput_buffer (p, EDIT_BUFFER, str);
     str = get_transput_buffer (EDIT_BUFFER);
     mood = (MOOD_T) (DIGIT_BLANK | INSERTION_NORMAL);
     if (IS (p, SIGN_MOULD)) {
       if (str[0] == '+' || str[0] == '-') {
         shift_sign (SUB (p), &str);
       }
       str = get_transput_buffer (EDIT_BUFFER);
       write_mould (SUB (p), ref_file, SIGN_MOULD, &str, &mood);
       FORWARD (p);
     }
     if (IS (p, INTEGRAL_MOULD)) {       // This *should* be the case
       write_mould (SUB (p), ref_file, INTEGRAL_MOULD, &str, &mood);
     }
     A68_SP = pop_sp;
   }
 }
 
 //! @brief Write REAL value using real pattern.
 
 void write_real_pattern (NODE_T * p, MOID_T * mode, MOID_T * root, BYTE_T * item, A68_REF ref_file)
 {
   errno = 0;
   if (!(mode == M_REAL || mode == M_LONG_REAL || mode == M_LONG_LONG_REAL || mode == M_INT || mode == M_LONG_INT || mode == M_LONG_LONG_INT)) {
     pattern_error (p, root, ATTRIBUTE (p));
   } else {
     ADDR_T pop_sp = A68_SP;
     int stag_digits = 0, frac_digits = 0, expo_digits = 0;
     int mant_length, sign = 0, exp_value;
     NODE_T *q, *sign_mould = NO_NODE, *stag_mould = NO_NODE, *point_frame = NO_NODE, *frac_mould = NO_NODE, *e_frame = NO_NODE, *expo_mould = NO_NODE;
     char *str = NO_TEXT, *stag_str = NO_TEXT, *frac_str = NO_TEXT;
     MOOD_T mood;
 // Dive into pattern.
     q = ((IS (p, REAL_PATTERN)) ? SUB (p) : p);
 // Dissect pattern and establish widths.
     if (q != NO_NODE && IS (q, SIGN_MOULD)) {
       sign_mould = q;
       count_zd_frames (SUB (sign_mould), &stag_digits);
       FORWARD (q);
     }
     if (q != NO_NODE && IS (q, INTEGRAL_MOULD)) {
       stag_mould = q;
       count_zd_frames (SUB (stag_mould), &stag_digits);
       FORWARD (q);
     }
     if (q != NO_NODE && IS (q, FORMAT_POINT_FRAME)) {
       point_frame = q;
       FORWARD (q);
     }
     if (q != NO_NODE && IS (q, INTEGRAL_MOULD)) {
       frac_mould = q;
       count_zd_frames (SUB (frac_mould), &frac_digits);
       FORWARD (q);
     }
     if (q != NO_NODE && IS (q, EXPONENT_FRAME)) {
       e_frame = SUB (q);
       expo_mould = NEXT_SUB (q);
       q = expo_mould;
       if (IS (q, SIGN_MOULD)) {
         count_zd_frames (SUB (q), &expo_digits);
         FORWARD (q);
       }
       if (IS (q, INTEGRAL_MOULD)) {
         count_zd_frames (SUB (q), &expo_digits);
       }
     }
 // Make string representation.
     if (point_frame == NO_NODE) {
       mant_length = stag_digits;
     } else {
       mant_length = 1 + stag_digits + frac_digits;
     }
     if (mode == M_REAL || mode == M_INT) {
       REAL_T x;
       if (mode == M_REAL) {
         x = VALUE ((A68_REAL *) item);
       } else {
         x = (REAL_T) VALUE ((A68_INT *) item);
       }
       CHECK_REAL (p, x);
       exp_value = 0;
       sign = SIGN (x);
       if (sign_mould != NO_NODE) {
         put_sign_to_integral (sign_mould, sign);
       }
       x = ABS (x);
       if (expo_mould != NO_NODE) {
         standardise (&x, stag_digits, frac_digits, &exp_value);
       }
       str = sub_fixed (p, x, mant_length, frac_digits);
     } else if (mode == M_LONG_REAL || mode == M_LONG_INT) {
 #if (A68_LEVEL >= 3)
       DOUBLE_NUM_T x = VALUE ((A68_DOUBLE *) item);
       if (mode == M_LONG_INT) {
         x = double_int_to_double (p, x);
       }
       CHECK_DOUBLE_REAL (p, x.f);
       exp_value = 0;
       sign = sign_double (x);
       if (sign_mould != NO_NODE) {
         put_sign_to_integral (sign_mould, sign);
       }
       x.f = fabs_double (x.f);
       if (expo_mould != NO_NODE) {
         standardise_double (&(x.f), stag_digits, frac_digits, &exp_value);
       }
       str = sub_fixed_double (p, x.f, mant_length, frac_digits, A68_LONG_REAL_WIDTH);
 #else
       ADDR_T pop_sp2 = A68_SP;
       int digits = DIGITS (mode);
       MP_T *x = nil_mp (p, digits);
       (void) move_mp (x, (MP_T *) item, digits);
       exp_value = 0;
       sign = SIGN (x[2]);
       if (sign_mould != NO_NODE) {
         put_sign_to_integral (sign_mould, sign);
       }
       x[2] = ABS (x[2]);
       if (expo_mould != NO_NODE) {
         long_standardise (p, x, DIGITS (mode), stag_digits, frac_digits, &exp_value);
       }
       str = long_sub_fixed (p, x, DIGITS (mode), mant_length, frac_digits);
       A68_SP = pop_sp2;
 #endif
     } else if (mode == M_LONG_LONG_REAL || mode == M_LONG_LONG_INT) {
       ADDR_T pop_sp2 = A68_SP;
       int digits = DIGITS (mode);
       MP_T *x = nil_mp (p, digits);
       (void) move_mp (x, (MP_T *) item, digits);
       exp_value = 0;
       sign = SIGN (x[2]);
       if (sign_mould != NO_NODE) {
         put_sign_to_integral (sign_mould, sign);
       }
       x[2] = ABS (x[2]);
       if (expo_mould != NO_NODE) {
         long_standardise (p, x, DIGITS (mode), stag_digits, frac_digits, &exp_value);
       }
       str = long_sub_fixed (p, x, DIGITS (mode), mant_length, frac_digits);
       A68_SP = pop_sp2;
     }
 // Edit and output the string.
     if (strchr (str, ERROR_CHAR) != NO_TEXT) {
       value_error (p, root, ref_file);
     }
     reset_transput_buffer (STRING_BUFFER);
     add_string_transput_buffer (p, STRING_BUFFER, str);
     stag_str = get_transput_buffer (STRING_BUFFER);
     if (strchr (stag_str, ERROR_CHAR) != NO_TEXT) {
       value_error (p, root, ref_file);
     }
     str = strchr (stag_str, POINT_CHAR);
     if (str != NO_TEXT) {
       frac_str = &str[1];
       str[0] = NULL_CHAR;
     } else {
       frac_str = NO_TEXT;
     }
 // Stagnant part.
     reset_transput_buffer (EDIT_BUFFER);
     if (sign_mould != NO_NODE) {
       put_sign_to_integral (sign_mould, sign);
     } else if (sign < 0) {
       value_sign_error (sign_mould, root, ref_file);
     }
     put_zeroes_to_integral (p, stag_digits - (int) strlen (stag_str));
     add_string_transput_buffer (p, EDIT_BUFFER, stag_str);
     stag_str = get_transput_buffer (EDIT_BUFFER);
     mood = (MOOD_T) (DIGIT_BLANK | INSERTION_NORMAL);
     if (sign_mould != NO_NODE) {
       if (stag_str[0] == '+' || stag_str[0] == '-') {
         shift_sign (SUB (p), &stag_str);
       }
       stag_str = get_transput_buffer (EDIT_BUFFER);
       write_mould (SUB (sign_mould), ref_file, SIGN_MOULD, &stag_str, &mood);
     }
     if (stag_mould != NO_NODE) {
       write_mould (SUB (stag_mould), ref_file, INTEGRAL_MOULD, &stag_str, &mood);
     }
 // Point frame.
     if (point_frame != NO_NODE) {
       write_pie_frame (point_frame, ref_file, FORMAT_POINT_FRAME, FORMAT_ITEM_POINT);
     }
 // Fraction.
     if (frac_mould != NO_NODE) {
       reset_transput_buffer (EDIT_BUFFER);
       add_string_transput_buffer (p, EDIT_BUFFER, frac_str);
       frac_str = get_transput_buffer (EDIT_BUFFER);
       mood = (MOOD_T) (DIGIT_NORMAL | INSERTION_NORMAL);
       write_mould (SUB (frac_mould), ref_file, INTEGRAL_MOULD, &frac_str, &mood);
     }
 // Exponent.
     if (expo_mould != NO_NODE) {
       A68_INT z;
       STATUS (&z) = INIT_MASK;
       VALUE (&z) = exp_value;
       if (e_frame != NO_NODE) {
         write_pie_frame (e_frame, ref_file, FORMAT_E_FRAME, FORMAT_ITEM_E);
       }
       write_integral_pattern (expo_mould, M_INT, root, (BYTE_T *) & z, ref_file);
     }
     A68_SP = pop_sp;
   }
 }
 
 //! @brief Write COMPLEX value using complex pattern.
 
 void write_complex_pattern (NODE_T * p, MOID_T * comp, MOID_T * root, BYTE_T * re, BYTE_T * im, A68_REF ref_file)
 {
   errno = 0;
 // Dissect pattern.
   NODE_T *reel = SUB (p);
   NODE_T *plus_i_times = NEXT (reel);
   NODE_T *imag = NEXT (plus_i_times);
 // Write pattern.
   write_real_pattern (reel, comp, root, re, ref_file);
   write_pie_frame (plus_i_times, ref_file, FORMAT_I_FRAME, FORMAT_ITEM_I);
   write_real_pattern (imag, comp, root, im, ref_file);
 }
 
 //! @brief Write BITS value using bits pattern.
 
 void write_bits_pattern (NODE_T * p, MOID_T * mode, BYTE_T * item, A68_REF ref_file)
 {
   ADDR_T pop_sp = A68_SP;
   int width = 0, radix;
   char *str;
   if (mode == M_BITS) {
     A68_BITS *z = (A68_BITS *) item;
 // Establish width and radix.
     count_zd_frames (SUB (p), &width);
     radix = get_replicator_value (SUB_SUB (p), A68_TRUE);
     if (radix < 2 || radix > 16) {
       diagnostic (A68_RUNTIME_ERROR, p, ERROR_INVALID_RADIX, radix);
       exit_genie (p, A68_RUNTIME_ERROR);
     }
 // Generate string of correct width.
     reset_transput_buffer (EDIT_BUFFER);
     if (!convert_radix (p, VALUE (z), radix, width)) {
       errno = EDOM;
       value_error (p, mode, ref_file);
     }
   } else if (mode == M_LONG_BITS) {
 #if (A68_LEVEL >= 3)
     A68_LONG_BITS *z = (A68_LONG_BITS *) item;
 // Establish width and radix.
     count_zd_frames (SUB (p), &width);
     radix = get_replicator_value (SUB_SUB (p), A68_TRUE);
     if (radix < 2 || radix > 16) {
       diagnostic (A68_RUNTIME_ERROR, p, ERROR_INVALID_RADIX, radix);
       exit_genie (p, A68_RUNTIME_ERROR);
     }
 // Generate string of correct width.
     reset_transput_buffer (EDIT_BUFFER);
     if (!convert_radix_double (p, VALUE (z), radix, width)) {
       errno = EDOM;
       value_error (p, mode, ref_file);
     }
 #else
     int digits = DIGITS (mode);
     MP_T *u = (MP_T *) item;
     MP_T *v = nil_mp (p, digits);
     MP_T *w = nil_mp (p, digits);
 // Establish width and radix.
     count_zd_frames (SUB (p), &width);
     radix = get_replicator_value (SUB_SUB (p), A68_TRUE);
     if (radix < 2 || radix > 16) {
       diagnostic (A68_RUNTIME_ERROR, p, ERROR_INVALID_RADIX, radix);
       exit_genie (p, A68_RUNTIME_ERROR);
     }
 // Generate string of correct width.
     reset_transput_buffer (EDIT_BUFFER);
     if (!convert_radix_mp (p, u, radix, width, mode, v, w)) {
       errno = EDOM;
       value_error (p, mode, ref_file);
     }
 #endif
   } else if (mode == M_LONG_LONG_BITS) {
 #if (A68_LEVEL <= 2)
     int digits = DIGITS (mode);
     MP_T *u = (MP_T *) item;
     MP_T *v = nil_mp (p, digits);
     MP_T *w = nil_mp (p, digits);
 // Establish width and radix.
     count_zd_frames (SUB (p), &width);
     radix = get_replicator_value (SUB_SUB (p), A68_TRUE);
     if (radix < 2 || radix > 16) {
       diagnostic (A68_RUNTIME_ERROR, p, ERROR_INVALID_RADIX, radix);
       exit_genie (p, A68_RUNTIME_ERROR);
     }
 // Generate string of correct width.
     reset_transput_buffer (EDIT_BUFFER);
     if (!convert_radix_mp (p, u, radix, width, mode, v, w)) {
       errno = EDOM;
       value_error (p, mode, ref_file);
     }
 #endif
   }
 // Output the edited string.
   MOOD_T mood = (MOOD_T) (DIGIT_BLANK | INSERTION_NORMAL);
   str = get_transput_buffer (EDIT_BUFFER);
   write_mould (NEXT_SUB (p), ref_file, INTEGRAL_MOULD, &str, &mood);
   A68_SP = pop_sp;
 }
 
 //! @brief Write value to file.
 
 void genie_write_real_format (NODE_T * p, BYTE_T * item, A68_REF ref_file)
 {
   if (IS (p, GENERAL_PATTERN) && NEXT_SUB (p) == NO_NODE) {
     genie_value_to_string (p, M_REAL, item, ATTRIBUTE (SUB (p)));
     add_string_from_stack_transput_buffer (p, FORMATTED_BUFFER);
   } else if (IS (p, GENERAL_PATTERN) && NEXT_SUB (p) != NO_NODE) {
     write_number_generic (p, M_REAL, item, ATTRIBUTE (SUB (p)));
   } else if (IS (p, FIXED_C_PATTERN) || IS (p, FLOAT_C_PATTERN) || IS (p, GENERAL_C_PATTERN)) {
     write_c_pattern (p, M_REAL, item, ref_file);
   } else if (IS (p, REAL_PATTERN)) {
     write_real_pattern (p, M_REAL, M_REAL, item, ref_file);
   } else if (IS (p, COMPLEX_PATTERN)) {
     A68_REAL im;
     STATUS (&im) = INIT_MASK;
     VALUE (&im) = 0.0;
     write_complex_pattern (p, M_REAL, M_COMPLEX, (BYTE_T *) item, (BYTE_T *) & im, ref_file);
   } else {
     pattern_error (p, M_REAL, ATTRIBUTE (p));
   }
 }
 
 //! @brief Write value to file.
 
 void genie_write_long_real_format (NODE_T * p, BYTE_T * item, A68_REF ref_file)
 {
   if (IS (p, GENERAL_PATTERN) && NEXT_SUB (p) == NO_NODE) {
     genie_value_to_string (p, M_LONG_REAL, item, ATTRIBUTE (SUB (p)));
     add_string_from_stack_transput_buffer (p, FORMATTED_BUFFER);
   } else if (IS (p, GENERAL_PATTERN) && NEXT_SUB (p) != NO_NODE) {
     write_number_generic (p, M_LONG_REAL, item, ATTRIBUTE (SUB (p)));
   } else if (IS (p, FIXED_C_PATTERN) || IS (p, FLOAT_C_PATTERN) || IS (p, GENERAL_C_PATTERN)) {
     write_c_pattern (p, M_LONG_REAL, item, ref_file);
   } else if (IS (p, REAL_PATTERN)) {
     write_real_pattern (p, M_LONG_REAL, M_LONG_REAL, item, ref_file);
   } else if (IS (p, COMPLEX_PATTERN)) {
 #if (A68_LEVEL >= 3)
     ADDR_T pop_sp = A68_SP;
     A68_LONG_REAL *z = (A68_LONG_REAL *) STACK_TOP;
     DOUBLE_NUM_T im;
     im.f = 0.0q;
     PUSH_VALUE (p, im, A68_LONG_REAL);
     write_complex_pattern (p, M_LONG_REAL, M_LONG_COMPLEX, item, (BYTE_T *) z, ref_file);
     A68_SP = pop_sp;
 #else
     ADDR_T pop_sp = A68_SP;
     MP_T *z = nil_mp (p, DIGITS (M_LONG_REAL));
     z[0] = (MP_T) INIT_MASK;
     write_complex_pattern (p, M_LONG_REAL, M_LONG_COMPLEX, item, (BYTE_T *) z, ref_file);
     A68_SP = pop_sp;
 #endif
   } else {
     pattern_error (p, M_LONG_REAL, ATTRIBUTE (p));
   }
 }
 
 //! @brief Write value to file.
 
 void genie_write_long_mp_real_format (NODE_T * p, BYTE_T * item, A68_REF ref_file)
 {
   if (IS (p, GENERAL_PATTERN) && NEXT_SUB (p) == NO_NODE) {
     genie_value_to_string (p, M_LONG_LONG_REAL, item, ATTRIBUTE (SUB (p)));
     add_string_from_stack_transput_buffer (p, FORMATTED_BUFFER);
   } else if (IS (p, GENERAL_PATTERN) && NEXT_SUB (p) != NO_NODE) {
     write_number_generic (p, M_LONG_LONG_REAL, item, ATTRIBUTE (SUB (p)));
   } else if (IS (p, FIXED_C_PATTERN) || IS (p, FLOAT_C_PATTERN) || IS (p, GENERAL_C_PATTERN)) {
     write_c_pattern (p, M_LONG_LONG_REAL, item, ref_file);
   } else if (IS (p, REAL_PATTERN)) {
     write_real_pattern (p, M_LONG_LONG_REAL, M_LONG_LONG_REAL, item, ref_file);
   } else if (IS (p, COMPLEX_PATTERN)) {
     ADDR_T pop_sp = A68_SP;
     MP_T *z = nil_mp (p, DIGITS (M_LONG_LONG_REAL));
     z[0] = (MP_T) INIT_MASK;
     write_complex_pattern (p, M_LONG_LONG_REAL, M_LONG_LONG_COMPLEX, item, (BYTE_T *) z, ref_file);
     A68_SP = pop_sp;
   } else {
     pattern_error (p, M_LONG_LONG_REAL, ATTRIBUTE (p));
   }
 }
 
 //! @brief At end of write purge all insertions.
 
 void purge_format_write (NODE_T * p, A68_REF ref_file)
 {
 // Problem here is shutting down embedded formats.
   BOOL_T siga;
   do {
     A68_FILE *file;
     NODE_T *dollar, *pat;
     A68_FORMAT *old_fmt;
     while ((pat = get_next_format_pattern (p, ref_file, SKIP_PATTERN)) != NO_NODE) {
       format_error (p, ref_file, ERROR_FORMAT_PICTURES);
     }
     file = FILE_DEREF (&ref_file);
     dollar = SUB (BODY (&FORMAT (file)));
     old_fmt = (A68_FORMAT *) FRAME_LOCAL (A68_FP, OFFSET (TAX (dollar)));
     siga = (BOOL_T) ! IS_NIL_FORMAT (old_fmt);
     if (siga) {
 // Pop embedded format and proceed.
       (void) end_of_format (p, ref_file);
     }
   } while (siga);
 }
 
 //! @brief Write value to file.
 
 void genie_write_standard_format (NODE_T * p, MOID_T * mode, BYTE_T * item, A68_REF ref_file, int *formats)
 {
   errno = 0;
   ABEND (mode == NO_MOID, ERROR_INTERNAL_CONSISTENCY, __func__);
   if (mode == M_FORMAT) {
     A68_FILE *file;
     CHECK_REF (p, ref_file, M_REF_FILE);
     file = FILE_DEREF (&ref_file);
 // Forget about eventual active formats and set up new one.
     if (*formats > 0) {
       purge_format_write (p, ref_file);
     }
     (*formats)++;
     A68_FP = FRAME_POINTER (file);
     A68_SP = STACK_POINTER (file);
     open_format_frame (p, ref_file, (A68_FORMAT *) item, NOT_EMBEDDED_FORMAT, A68_TRUE);
   } else if (mode == M_PROC_REF_FILE_VOID) {
     diagnostic (A68_RUNTIME_ERROR, p, ERROR_UNDEFINED_TRANSPUT, M_PROC_REF_FILE_VOID);
     exit_genie (p, A68_RUNTIME_ERROR);
   } else if (mode == M_SOUND) {
     diagnostic (A68_RUNTIME_ERROR, p, ERROR_UNDEFINED_TRANSPUT, M_SOUND);
     exit_genie (p, A68_RUNTIME_ERROR);
   } else if (mode == M_INT) {
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     if (IS (pat, GENERAL_PATTERN) && NEXT_SUB (pat) == NO_NODE) {
       genie_value_to_string (p, mode, item, ATTRIBUTE (SUB (pat)));
       add_string_from_stack_transput_buffer (p, FORMATTED_BUFFER);
     } else if (IS (pat, GENERAL_PATTERN) && NEXT_SUB (pat) != NO_NODE) {
       write_number_generic (pat, M_INT, item, ATTRIBUTE (SUB (pat)));
     } else if (IS (pat, INTEGRAL_C_PATTERN) || IS (pat, FIXED_C_PATTERN) || IS (pat, FLOAT_C_PATTERN) || IS (pat, GENERAL_C_PATTERN)) {
       write_c_pattern (pat, M_INT, item, ref_file);
     } else if (IS (pat, INTEGRAL_PATTERN)) {
       write_integral_pattern (pat, M_INT, M_INT, item, ref_file);
     } else if (IS (pat, REAL_PATTERN)) {
       write_real_pattern (pat, M_INT, M_INT, item, ref_file);
     } else if (IS (pat, COMPLEX_PATTERN)) {
       A68_REAL re, im;
       STATUS (&re) = INIT_MASK;
       VALUE (&re) = (REAL_T) VALUE ((A68_INT *) item);
       STATUS (&im) = INIT_MASK;
       VALUE (&im) = 0.0;
       write_complex_pattern (pat, M_REAL, M_COMPLEX, (BYTE_T *) & re, (BYTE_T *) & im, ref_file);
     } else if (IS (pat, CHOICE_PATTERN)) {
       int k = VALUE ((A68_INT *) item);
       write_choice_pattern (NEXT_SUB (pat), ref_file, &k);
     } else {
       pattern_error (p, mode, ATTRIBUTE (pat));
     }
   } else if (mode == M_LONG_INT) {
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     if (IS (pat, GENERAL_PATTERN) && NEXT_SUB (pat) == NO_NODE) {
       genie_value_to_string (p, mode, item, ATTRIBUTE (SUB (pat)));
       add_string_from_stack_transput_buffer (p, FORMATTED_BUFFER);
     } else if (IS (pat, GENERAL_PATTERN) && NEXT_SUB (pat) != NO_NODE) {
       write_number_generic (pat, M_LONG_INT, item, ATTRIBUTE (SUB (pat)));
     } else if (IS (pat, INTEGRAL_C_PATTERN) || IS (pat, FIXED_C_PATTERN) || IS (pat, FLOAT_C_PATTERN) || IS (pat, GENERAL_C_PATTERN)) {
       write_c_pattern (pat, M_LONG_INT, item, ref_file);
     } else if (IS (pat, INTEGRAL_PATTERN)) {
       write_integral_pattern (pat, M_LONG_INT, M_LONG_INT, item, ref_file);
     } else if (IS (pat, REAL_PATTERN)) {
       write_real_pattern (pat, M_LONG_INT, M_LONG_INT, item, ref_file);
     } else if (IS (pat, COMPLEX_PATTERN)) {
 #if (A68_LEVEL >= 3)
       ADDR_T pop_sp = A68_SP;
       A68_LONG_REAL *z = (A68_LONG_REAL *) STACK_TOP;
       DOUBLE_NUM_T im;
       im.f = 0.0q;
       PUSH_VALUE (p, im, A68_LONG_REAL);
       write_complex_pattern (p, M_LONG_REAL, M_LONG_COMPLEX, item, (BYTE_T *) z, ref_file);
       A68_SP = pop_sp;
 #else
       ADDR_T pop_sp = A68_SP;
       MP_T *z = nil_mp (p, DIGITS (mode));
       z[0] = (MP_T) INIT_MASK;
       write_complex_pattern (pat, M_LONG_REAL, M_LONG_COMPLEX, item, (BYTE_T *) z, ref_file);
       A68_SP = pop_sp;
 #endif
     } else if (IS (pat, CHOICE_PATTERN)) {
       INT_T k = mp_to_int (p, (MP_T *) item, DIGITS (mode));
       int sk;
       CHECK_INT_SHORTEN (p, k);
       sk = (int) k;
       write_choice_pattern (NEXT_SUB (pat), ref_file, &sk);
     } else {
       pattern_error (p, mode, ATTRIBUTE (pat));
     }
   } else if (mode == M_LONG_LONG_INT) {
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     if (IS (pat, GENERAL_PATTERN) && NEXT_SUB (pat) == NO_NODE) {
       genie_value_to_string (p, mode, item, ATTRIBUTE (SUB (pat)));
       add_string_from_stack_transput_buffer (p, FORMATTED_BUFFER);
     } else if (IS (pat, GENERAL_PATTERN) && NEXT_SUB (pat) != NO_NODE) {
       write_number_generic (pat, M_LONG_LONG_INT, item, ATTRIBUTE (SUB (pat)));
     } else if (IS (pat, INTEGRAL_C_PATTERN) || IS (pat, FIXED_C_PATTERN) || IS (pat, FLOAT_C_PATTERN) || IS (pat, GENERAL_C_PATTERN)) {
       write_c_pattern (pat, M_LONG_LONG_INT, item, ref_file);
     } else if (IS (pat, INTEGRAL_PATTERN)) {
       write_integral_pattern (pat, M_LONG_LONG_INT, M_LONG_LONG_INT, item, ref_file);
     } else if (IS (pat, REAL_PATTERN)) {
       write_real_pattern (pat, M_INT, M_INT, item, ref_file);
     } else if (IS (pat, REAL_PATTERN)) {
       write_real_pattern (pat, M_LONG_LONG_INT, M_LONG_LONG_INT, item, ref_file);
     } else if (IS (pat, COMPLEX_PATTERN)) {
       ADDR_T pop_sp = A68_SP;
       MP_T *z = nil_mp (p, DIGITS (M_LONG_LONG_REAL));
       z[0] = (MP_T) INIT_MASK;
       write_complex_pattern (pat, M_LONG_LONG_REAL, M_LONG_LONG_COMPLEX, item, (BYTE_T *) z, ref_file);
       A68_SP = pop_sp;
     } else if (IS (pat, CHOICE_PATTERN)) {
       INT_T k = mp_to_int (p, (MP_T *) item, DIGITS (mode));
       int sk;
       CHECK_INT_SHORTEN (p, k);
       sk = (int) k;
       write_choice_pattern (NEXT_SUB (pat), ref_file, &sk);
     } else {
       pattern_error (p, mode, ATTRIBUTE (pat));
     }
   } else if (mode == M_REAL) {
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     genie_write_real_format (pat, item, ref_file);
   } else if (mode == M_LONG_REAL) {
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     genie_write_long_real_format (pat, item, ref_file);
   } else if (mode == M_LONG_LONG_REAL) {
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     genie_write_long_mp_real_format (pat, item, ref_file);
   } else if (mode == M_COMPLEX) {
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     if (IS (pat, COMPLEX_PATTERN)) {
       write_complex_pattern (pat, M_REAL, M_COMPLEX, &item[0], &item[SIZE (M_REAL)], ref_file);
     } else {
 // Try writing as two REAL values.
       genie_write_real_format (pat, item, ref_file);
       genie_write_standard_format (p, M_REAL, &item[SIZE (M_REAL)], ref_file, formats);
     }
   } else if (mode == M_LONG_COMPLEX) {
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     if (IS (pat, COMPLEX_PATTERN)) {
       write_complex_pattern (pat, M_LONG_REAL, M_LONG_COMPLEX, &item[0], &item[SIZE (M_LONG_REAL)], ref_file);
     } else {
 // Try writing as two LONG REAL values.
       genie_write_long_real_format (pat, item, ref_file);
       genie_write_standard_format (p, M_LONG_REAL, &item[SIZE (M_LONG_REAL)], ref_file, formats);
     }
   } else if (mode == M_LONG_LONG_COMPLEX) {
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     if (IS (pat, COMPLEX_PATTERN)) {
       write_complex_pattern (pat, M_LONG_LONG_REAL, M_LONG_LONG_COMPLEX, &item[0], &item[SIZE (M_LONG_LONG_REAL)], ref_file);
     } else {
 // Try writing as two LONG LONG REAL values.
       genie_write_long_mp_real_format (pat, item, ref_file);
       genie_write_standard_format (p, M_LONG_LONG_REAL, &item[SIZE (M_LONG_LONG_REAL)], ref_file, formats);
     }
   } else if (mode == M_BOOL) {
     A68_BOOL *z = (A68_BOOL *) item;
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     if (IS (pat, GENERAL_PATTERN) && NEXT_SUB (pat) == NO_NODE) {
       plusab_transput_buffer (p, FORMATTED_BUFFER, (char) (VALUE (z) == A68_TRUE ? FLIP_CHAR : FLOP_CHAR));
     } else if (IS (pat, BOOLEAN_PATTERN)) {
       if (NEXT_SUB (pat) == NO_NODE) {
         plusab_transput_buffer (p, FORMATTED_BUFFER, (char) (VALUE (z) == A68_TRUE ? FLIP_CHAR : FLOP_CHAR));
       } else {
         write_boolean_pattern (pat, ref_file, (BOOL_T) (VALUE (z) == A68_TRUE));
       }
     } else {
       pattern_error (p, mode, ATTRIBUTE (pat));
     }
   } else if (mode == M_BITS) {
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     if (IS (pat, GENERAL_PATTERN) && NEXT_SUB (pat) == NO_NODE) {
       char *str = (char *) STACK_TOP;
       genie_value_to_string (p, mode, item, ATTRIBUTE (SUB (p)));
       add_string_transput_buffer (p, FORMATTED_BUFFER, str);
     } else if (IS (pat, BITS_PATTERN)) {
       write_bits_pattern (pat, M_BITS, item, ref_file);
     } else if (IS (pat, BITS_C_PATTERN)) {
       write_c_pattern (pat, M_BITS, item, ref_file);
     } else {
       pattern_error (p, mode, ATTRIBUTE (pat));
     }
   } else if (mode == M_LONG_BITS || mode == M_LONG_LONG_BITS) {
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     if (IS (pat, GENERAL_PATTERN) && NEXT_SUB (pat) == NO_NODE) {
       char *str = (char *) STACK_TOP;
       genie_value_to_string (p, mode, item, ATTRIBUTE (SUB (p)));
       add_string_transput_buffer (p, FORMATTED_BUFFER, str);
     } else if (IS (pat, BITS_PATTERN)) {
       write_bits_pattern (pat, mode, item, ref_file);
     } else if (IS (pat, BITS_C_PATTERN)) {
       write_c_pattern (pat, mode, item, ref_file);
     } else {
       pattern_error (p, mode, ATTRIBUTE (pat));
     }
   } else if (mode == M_CHAR) {
     A68_CHAR *z = (A68_CHAR *) item;
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     if (IS (pat, GENERAL_PATTERN) && NEXT_SUB (pat) == NO_NODE) {
       plusab_transput_buffer (p, FORMATTED_BUFFER, (char) VALUE (z));
     } else if (IS (pat, STRING_PATTERN)) {
       char *q = get_transput_buffer (EDIT_BUFFER);
       reset_transput_buffer (EDIT_BUFFER);
       plusab_transput_buffer (p, EDIT_BUFFER, (char) VALUE (z));
       write_string_pattern (pat, mode, ref_file, &q);
       if (q[0] != NULL_CHAR) {
         value_error (p, mode, ref_file);
       }
     } else if (IS (pat, STRING_C_PATTERN)) {
       char zz[2];
       zz[0] = VALUE (z);
       zz[1] = '\0';
       (void) c_to_a_string (pat, zz, 1);
       write_c_pattern (pat, mode, (BYTE_T *) zz, ref_file);
     } else {
       pattern_error (p, mode, ATTRIBUTE (pat));
     }
   } else if (mode == M_ROW_CHAR || mode == M_STRING) {
 // Handle these separately instead of printing [] CHAR.
     A68_REF row = *(A68_REF *) item;
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     if (IS (pat, GENERAL_PATTERN) && NEXT_SUB (pat) == NO_NODE) {
       PUSH_REF (p, row);
       add_string_from_stack_transput_buffer (p, FORMATTED_BUFFER);
     } else if (IS (pat, STRING_PATTERN)) {
       char *q;
       PUSH_REF (p, row);
       reset_transput_buffer (EDIT_BUFFER);
       add_string_from_stack_transput_buffer (p, EDIT_BUFFER);
       q = get_transput_buffer (EDIT_BUFFER);
       write_string_pattern (pat, mode, ref_file, &q);
       if (q[0] != NULL_CHAR) {
         value_error (p, mode, ref_file);
       }
     } else if (IS (pat, STRING_C_PATTERN)) {
       char *q;
       PUSH_REF (p, row);
       reset_transput_buffer (EDIT_BUFFER);
       add_string_from_stack_transput_buffer (p, EDIT_BUFFER);
       q = get_transput_buffer (EDIT_BUFFER);
       write_c_pattern (pat, mode, (BYTE_T *) q, ref_file);
     } else {
       pattern_error (p, mode, ATTRIBUTE (pat));
     }
   } else if (IS_UNION (mode)) {
     A68_UNION *z = (A68_UNION *) item;
     genie_write_standard_format (p, (MOID_T *) (VALUE (z)), &item[A68_UNION_SIZE], ref_file, formats);
   } else if (IS_STRUCT (mode)) {
     for (PACK_T *q = PACK (mode); q != NO_PACK; FORWARD (q)) {
       BYTE_T *elem = &item[OFFSET (q)];
       genie_check_initialisation (p, elem, MOID (q));
       genie_write_standard_format (p, MOID (q), elem, ref_file, formats);
     }
   } else if (IS_ROW (mode) || IS_FLEX (mode)) {
     MOID_T *deflexed = DEFLEX (mode);
     CHECK_INIT (p, INITIALISED ((A68_REF *) item), M_ROWS);
     A68_ARRAY *arr; A68_TUPLE *tup;
     GET_DESCRIPTOR (arr, tup, (A68_REF *) item);
     if (get_row_size (tup, DIM (arr)) > 0) {
       BYTE_T *base_addr = DEREF (BYTE_T, &ARRAY (arr));
       BOOL_T done = A68_FALSE;
       initialise_internal_index (tup, DIM (arr));
       while (!done) {
         ADDR_T a68_index = calculate_internal_index (tup, DIM (arr));
         ADDR_T elem_addr = ROW_ELEMENT (arr, a68_index);
         BYTE_T *elem = &base_addr[elem_addr];
         genie_check_initialisation (p, elem, SUB (deflexed));
         genie_write_standard_format (p, SUB (deflexed), elem, ref_file, formats);
         done = increment_internal_index (tup, DIM (arr));
       }
     }
   }
   if (errno != 0) {
     transput_error (p, ref_file, mode);
   }
 }
 
 //! @brief PROC ([] SIMPLOUT) VOID print f, write f
 
 void genie_write_format (NODE_T * p)
 {
   A68_REF row;
   POP_REF (p, &row);
   genie_stand_out (p);
   PUSH_REF (p, row);
   genie_write_file_format (p);
 }
 
 //! @brief PROC (REF FILE, [] SIMPLOUT) VOID put f
 
 void genie_write_file_format (NODE_T * p)
 {
   A68_REF row;
   POP_REF (p, &row);
   CHECK_REF (p, row, M_ROW_SIMPLOUT);
   A68_ARRAY *arr; A68_TUPLE *tup;
   GET_DESCRIPTOR (arr, tup, &row);
   int elems = ROW_SIZE (tup);
   A68_REF ref_file;
   POP_REF (p, &ref_file);
   CHECK_REF (p, ref_file, M_REF_FILE);
   A68_FILE *file = FILE_DEREF (&ref_file);
   CHECK_INIT (p, INITIALISED (file), M_FILE);
   if (!OPENED (file)) {
     diagnostic (A68_RUNTIME_ERROR, p, ERROR_FILE_NOT_OPEN);
     exit_genie (p, A68_RUNTIME_ERROR);
   }
   if (DRAW_MOOD (file)) {
     diagnostic (A68_RUNTIME_ERROR, p, ERROR_FILE_WRONG_MOOD, "draw");
     exit_genie (p, A68_RUNTIME_ERROR);
   }
   if (READ_MOOD (file)) {
     diagnostic (A68_RUNTIME_ERROR, p, ERROR_FILE_WRONG_MOOD, "read");
     exit_genie (p, A68_RUNTIME_ERROR);
   }
   if (!PUT (&CHANNEL (file))) {
     diagnostic (A68_RUNTIME_ERROR, p, ERROR_CHANNEL_DOES_NOT_ALLOW, "putting");
     exit_genie (p, A68_RUNTIME_ERROR);
   }
   if (!READ_MOOD (file) && !WRITE_MOOD (file)) {
     if (IS_NIL (STRING (file))) {
       if ((FD (file) = open_physical_file (p, ref_file, A68_WRITE_ACCESS, A68_PROTECTION)) == A68_NO_FILE) {
         open_error (p, ref_file, "putting");
       }
     } else {
       FD (file) = open_physical_file (p, ref_file, A68_WRITE_ACCESS, 0);
     }
     DRAW_MOOD (file) = A68_FALSE;
     READ_MOOD (file) = A68_FALSE;
     WRITE_MOOD (file) = A68_TRUE;
     CHAR_MOOD (file) = A68_TRUE;
   }
   if (!CHAR_MOOD (file)) {
     diagnostic (A68_RUNTIME_ERROR, p, ERROR_FILE_WRONG_MOOD, "binary");
     exit_genie (p, A68_RUNTIME_ERROR);
   }
 // Save stack state since formats have frames.
   ADDR_T pop_fp = FRAME_POINTER (file), pop_sp = STACK_POINTER (file);
   FRAME_POINTER (file) = A68_FP;
   STACK_POINTER (file) = A68_SP;
 // Process [] SIMPLOUT.
   if (BODY (&FORMAT (file)) != NO_NODE) {
     open_format_frame (p, ref_file, &FORMAT (file), NOT_EMBEDDED_FORMAT, A68_FALSE);
   }
   if (elems <= 0) {
     return;
   }
   BYTE_T *base_address = DEREF (BYTE_T, &ARRAY (arr));
   int elem_index = 0, formats = 0;
   for (int k = 0; k < elems; k++) {
     A68_UNION *z = (A68_UNION *) & (base_address[elem_index]);
     MOID_T *mode = (MOID_T *) (VALUE (z));
     BYTE_T *item = &(base_address[elem_index + A68_UNION_SIZE]);
     genie_write_standard_format (p, mode, item, ref_file, &formats);
     elem_index += SIZE (M_SIMPLOUT);
   }
 // Empty the format to purge insertions.
   purge_format_write (p, ref_file);
   BODY (&FORMAT (file)) = NO_NODE;
 // Dump the buffer.
   write_purge_buffer (p, ref_file, FORMATTED_BUFFER);
 // Forget about active formats.
   A68_FP = FRAME_POINTER (file);
   A68_SP = STACK_POINTER (file);
   FRAME_POINTER (file) = pop_fp;
   STACK_POINTER (file) = pop_sp;
 }
 
 //! @brief Give a value error in case a character is not among expected ones.
 
 BOOL_T expect (NODE_T * p, MOID_T * m, A68_REF ref_file, const char *items, char ch)
 {
   if (strchr ((char *) items, ch) == NO_TEXT) {
     value_error (p, m, ref_file);
     return A68_FALSE;
   } else {
     return A68_TRUE;
   }
 }
 
 //! @brief Read a group of insertions.
 
 void read_insertion (NODE_T * p, A68_REF ref_file)
 {
 
 // Algol68G does not check whether the insertions are textually there. It just
 // skips them. This because we blank literals in sign moulds before the sign is
 // put, which is non-standard Algol68, but convenient.
 
   A68_FILE *file = FILE_DEREF (&ref_file);
   for (; p != NO_NODE; FORWARD (p)) {
     read_insertion (SUB (p), ref_file);
     if (IS (p, FORMAT_ITEM_L)) {
       BOOL_T siga = (BOOL_T) ! END_OF_FILE (file);
       while (siga) {
         int ch = read_single_char (p, ref_file);
         siga = (BOOL_T) ((ch != NEWLINE_CHAR) && (ch != EOF_CHAR) && !END_OF_FILE (file));
       }
     } else if (IS (p, FORMAT_ITEM_P)) {
       BOOL_T siga = (BOOL_T) ! END_OF_FILE (file);
       while (siga) {
         int ch = read_single_char (p, ref_file);
         siga = (BOOL_T) ((ch != FORMFEED_CHAR) && (ch != EOF_CHAR) && !END_OF_FILE (file));
       }
     } else if (IS (p, FORMAT_ITEM_X) || IS (p, FORMAT_ITEM_Q)) {
       if (!END_OF_FILE (file)) {
         (void) read_single_char (p, ref_file);
       }
     } else if (IS (p, FORMAT_ITEM_Y)) {
       PUSH_REF (p, ref_file);
       PUSH_VALUE (p, -1, A68_INT);
       genie_set (p);
     } else if (IS (p, LITERAL)) {
 // Skip characters, but don't check the literal. 
       int len = (int) strlen (NSYMBOL (p));
       while (len-- && !END_OF_FILE (file)) {
         (void) read_single_char (p, ref_file);
       }
     } else if (IS (p, REPLICATOR)) {
       int k = get_replicator_value (SUB (p), A68_TRUE);
       if (ATTRIBUTE (SUB_NEXT (p)) != FORMAT_ITEM_K) {
         for (int j = 1; j <= k; j++) {
           read_insertion (NEXT (p), ref_file);
         }
       } else {
         int pos = get_transput_buffer_index (INPUT_BUFFER);
         for (int j = 1; j < (k - pos); j++) {
           if (!END_OF_FILE (file)) {
             (void) read_single_char (p, ref_file);
           }
         }
       }
       return;  // From REPLICATOR, don't delete this!
     }
   }
 }
 
 //! @brief Read string from file according current format.
 
 void read_string_pattern (NODE_T * p, MOID_T * m, A68_REF ref_file)
 {
   for (; p != NO_NODE; FORWARD (p)) {
     if (IS (p, INSERTION)) {
       read_insertion (SUB (p), ref_file);
     } else if (IS (p, FORMAT_ITEM_A)) {
       scan_n_chars (p, 1, m, ref_file);
     } else if (IS (p, FORMAT_ITEM_S)) {
       plusab_transput_buffer (p, INPUT_BUFFER, BLANK_CHAR);
       return;
     } else if (IS (p, REPLICATOR)) {
       int k = get_replicator_value (SUB (p), A68_TRUE);
       for (int j = 1; j <= k; j++) {
         read_string_pattern (NEXT (p), m, ref_file);
       }
       return;
     } else {
       read_string_pattern (SUB (p), m, ref_file);
     }
   }
 }
 
 //! @brief Traverse choice pattern.
 
 void traverse_choice_pattern (NODE_T * p, char *str, int len, int *count, int *matches, int *first_match, BOOL_T * full_match)
 {
   for (; p != NO_NODE; FORWARD (p)) {
     traverse_choice_pattern (SUB (p), str, len, count, matches, first_match, full_match);
     if (IS (p, LITERAL)) {
       (*count)++;
       if (strncmp (NSYMBOL (p), str, (size_t) len) == 0) {
         (*matches)++;
         (*full_match) = (BOOL_T) ((*full_match) | (strcmp (NSYMBOL (p), str) == 0));
         if (*first_match == 0 && *full_match) {
           *first_match = *count;
         }
       }
     }
   }
 }
 
 //! @brief Read appropriate insertion from a choice pattern.
 
 int read_choice_pattern (NODE_T * p, A68_REF ref_file)
 {
 
 // This implementation does not have the RR peculiarity that longest
 // matching literal must be first, in case of non-unique first chars.
 
   A68_FILE *file = FILE_DEREF (&ref_file);
   BOOL_T cont = A68_TRUE;
   int longest_match = 0, longest_match_len = 0;
   while (cont) {
     int ch = char_scanner (file);
     if (!END_OF_FILE (file)) {
       int len, count = 0, matches = 0, first_match = 0;
       BOOL_T full_match = A68_FALSE;
       plusab_transput_buffer (p, INPUT_BUFFER, (char) ch);
       len = get_transput_buffer_index (INPUT_BUFFER);
       traverse_choice_pattern (p, get_transput_buffer (INPUT_BUFFER), len, &count, &matches, &first_match, &full_match);
       if (full_match && matches == 1 && first_match > 0) {
         return first_match;
       } else if (full_match && matches > 1 && first_match > 0) {
         longest_match = first_match;
         longest_match_len = len;
       } else if (matches == 0) {
         cont = A68_FALSE;
       }
     } else {
       cont = A68_FALSE;
     }
   }
   if (longest_match > 0) {
 // Push back look-ahead chars.
     if (get_transput_buffer_index (INPUT_BUFFER) > 0) {
       char *z = get_transput_buffer (INPUT_BUFFER);
       END_OF_FILE (file) = A68_FALSE;
       add_string_transput_buffer (p, TRANSPUT_BUFFER (file), &z[longest_match_len]);
     }
     return longest_match;
   } else {
     value_error (p, M_INT, ref_file);
     return 0;
   }
 }
 
 //! @brief Read value according to a general-pattern.
 
 void read_number_generic (NODE_T * p, MOID_T * mode, BYTE_T * item, A68_REF ref_file)
 {
   GENIE_UNIT (NEXT_SUB (p));
 // RR says to ignore parameters just calculated, so we will.
   A68_REF row;
   POP_REF (p, &row);
   genie_read_standard (p, mode, item, ref_file);
 }
 
 // INTEGRAL, REAL, COMPLEX and BITS patterns.
 
 //! @brief Read sign-mould according current format.
 
 void read_sign_mould (NODE_T * p, MOID_T * m, A68_REF ref_file, int *sign)
 {
   for (; p != NO_NODE; FORWARD (p)) {
     if (IS (p, INSERTION)) {
       read_insertion (SUB (p), ref_file);
     } else if (IS (p, REPLICATOR)) {
       int k = get_replicator_value (SUB (p), A68_TRUE);
       for (int j = 1; j <= k; j++) {
         read_sign_mould (NEXT (p), m, ref_file, sign);
       }
       return;                   // Leave this!
     } else {
       switch (ATTRIBUTE (p)) {
       case FORMAT_ITEM_Z:
       case FORMAT_ITEM_D:
       case FORMAT_ITEM_S:
       case FORMAT_ITEM_PLUS:
       case FORMAT_ITEM_MINUS: {
           int ch = read_single_char (p, ref_file);
 // When a sign has been read, digits are expected.
           if (*sign != 0) {
             if (expect (p, m, ref_file, INT_DIGITS, (char) ch)) {
               plusab_transput_buffer (p, INPUT_BUFFER, (char) ch);
             } else {
               plusab_transput_buffer (p, INPUT_BUFFER, '0');
             }
 // When a sign has not been read, a sign is expected.  If there is a digit
 // in stead of a sign, the digit is accepted and '+' is assumed; RR demands a
 // space to preceed the digit, Algol68G does not.
           } else {
             if (strchr (SIGN_DIGITS, ch) != NO_TEXT) {
               if (ch == '+') {
                 *sign = 1;
               } else if (ch == '-') {
                 *sign = -1;
               } else if (ch == BLANK_CHAR) {
                 ;
               }
             } else if (expect (p, m, ref_file, INT_DIGITS, (char) ch)) {
               plusab_transput_buffer (p, INPUT_BUFFER, (char) ch);
               *sign = 1;
             }
           }
           break;
         }
       default: {
           read_sign_mould (SUB (p), m, ref_file, sign);
           break;
         }
       }
     }
   }
 }
 
 //! @brief Read mould according current format.
 
 void read_integral_mould (NODE_T * p, MOID_T * m, A68_REF ref_file)
 {
   for (; p != NO_NODE; FORWARD (p)) {
     if (IS (p, INSERTION)) {
       read_insertion (SUB (p), ref_file);
     } else if (IS (p, REPLICATOR)) {
       int k = get_replicator_value (SUB (p), A68_TRUE);
       for (int j = 1; j <= k; j++) {
         read_integral_mould (NEXT (p), m, ref_file);
       }
       return; // Leave this!
     } else if (IS (p, FORMAT_ITEM_Z)) {
       int ch = read_single_char (p, ref_file);
       const char *digits = (m == M_BITS || m == M_LONG_BITS || m == M_LONG_LONG_BITS) ? BITS_DIGITS_BLANK : INT_DIGITS_BLANK;
       if (expect (p, m, ref_file, digits, (char) ch)) {
         plusab_transput_buffer (p, INPUT_BUFFER, (char) ((ch == BLANK_CHAR) ? '0' : ch));
       } else {
         plusab_transput_buffer (p, INPUT_BUFFER, '0');
       }
     } else if (IS (p, FORMAT_ITEM_D)) {
       int ch = read_single_char (p, ref_file);
       const char *digits = (m == M_BITS || m == M_LONG_BITS || m == M_LONG_LONG_BITS) ? BITS_DIGITS : INT_DIGITS;
       if (expect (p, m, ref_file, digits, (char) ch)) {
         plusab_transput_buffer (p, INPUT_BUFFER, (char) ch);
       } else {
         plusab_transput_buffer (p, INPUT_BUFFER, '0');
       }
     } else if (IS (p, FORMAT_ITEM_S)) {
       plusab_transput_buffer (p, INPUT_BUFFER, '0');
     } else {
       read_integral_mould (SUB (p), m, ref_file);
     }
   }
 }
 
 //! @brief Read mould according current format.
 
 void read_integral_pattern (NODE_T * p, MOID_T * m, BYTE_T * item, A68_REF ref_file)
 {
   NODE_T *q = SUB (p);
   if (q != NO_NODE && IS (q, SIGN_MOULD)) {
     int sign = 0;
     char *z;
     plusab_transput_buffer (p, INPUT_BUFFER, BLANK_CHAR);
     read_sign_mould (SUB (q), m, ref_file, &sign);
     z = get_transput_buffer (INPUT_BUFFER);
     z[0] = (char) ((sign == -1) ? '-' : '+');
     FORWARD (q);
   }
   if (q != NO_NODE && IS (q, INTEGRAL_MOULD)) {
     read_integral_mould (SUB (q), m, ref_file);
   }
   genie_string_to_value (p, m, item, ref_file);
 }
 
 //! @brief Read point, exponent or i-frame.
 
 void read_pie_frame (NODE_T * p, MOID_T * m, A68_REF ref_file, int att, int item, char ch)
 {
 // Widen ch to a stringlet.
   char sym[3];
   sym[0] = ch;
   sym[1] = (char) TO_LOWER (ch);
   sym[2] = NULL_CHAR;
 // Now read the frame.
   for (; p != NO_NODE; FORWARD (p)) {
     if (IS (p, INSERTION)) {
       read_insertion (p, ref_file);
     } else if (IS (p, att)) {
       read_pie_frame (SUB (p), m, ref_file, att, item, ch);
       return;
     } else if (IS (p, FORMAT_ITEM_S)) {
       plusab_transput_buffer (p, INPUT_BUFFER, sym[0]);
       return;
     } else if (IS (p, item)) {
       int ch0 = read_single_char (p, ref_file);
       if (expect (p, m, ref_file, sym, (char) ch0)) {
         plusab_transput_buffer (p, INPUT_BUFFER, sym[0]);
       } else {
         plusab_transput_buffer (p, INPUT_BUFFER, sym[0]);
       }
     }
   }
 }
 
 //! @brief Read REAL value using real pattern.
 
 void read_real_pattern (NODE_T * p, MOID_T * m, BYTE_T * item, A68_REF ref_file)
 {
 // Dive into pattern.
   NODE_T *q = (IS (p, REAL_PATTERN)) ? SUB (p) : p;
 // Dissect pattern.
   if (q != NO_NODE && IS (q, SIGN_MOULD)) {
     int sign = 0;
     char *z;
     plusab_transput_buffer (p, INPUT_BUFFER, BLANK_CHAR);
     read_sign_mould (SUB (q), m, ref_file, &sign);
     z = get_transput_buffer (INPUT_BUFFER);
     z[0] = (char) ((sign == -1) ? '-' : '+');
     FORWARD (q);
   }
   if (q != NO_NODE && IS (q, INTEGRAL_MOULD)) {
     read_integral_mould (SUB (q), m, ref_file);
     FORWARD (q);
   }
   if (q != NO_NODE && IS (q, FORMAT_POINT_FRAME)) {
     read_pie_frame (SUB (q), m, ref_file, FORMAT_POINT_FRAME, FORMAT_ITEM_POINT, POINT_CHAR);
     FORWARD (q);
   }
   if (q != NO_NODE && IS (q, INTEGRAL_MOULD)) {
     read_integral_mould (SUB (q), m, ref_file);
     FORWARD (q);
   }
   if (q != NO_NODE && IS (q, EXPONENT_FRAME)) {
     read_pie_frame (SUB (q), m, ref_file, FORMAT_E_FRAME, FORMAT_ITEM_E, EXPONENT_CHAR);
     q = NEXT_SUB (q);
     if (q != NO_NODE && IS (q, SIGN_MOULD)) {
       int k, sign = 0;
       char *z;
       plusab_transput_buffer (p, INPUT_BUFFER, BLANK_CHAR);
       k = get_transput_buffer_index (INPUT_BUFFER);
       read_sign_mould (SUB (q), m, ref_file, &sign);
       z = get_transput_buffer (INPUT_BUFFER);
       z[k - 1] = (char) ((sign == -1) ? '-' : '+');
       FORWARD (q);
     }
     if (q != NO_NODE && IS (q, INTEGRAL_MOULD)) {
       read_integral_mould (SUB (q), m, ref_file);
       FORWARD (q);
     }
   }
   genie_string_to_value (p, m, item, ref_file);
 }
 
 //! @brief Read COMPLEX value using complex pattern.
 
 void read_complex_pattern (NODE_T * p, MOID_T * comp, MOID_T * m, BYTE_T * re, BYTE_T * im, A68_REF ref_file)
 {
 // Dissect pattern.
   NODE_T *reel = SUB (p);
   NODE_T *plus_i_times = NEXT (reel);
   NODE_T *imag = NEXT (plus_i_times);
 // Read pattern.
   read_real_pattern (reel, m, re, ref_file);
   reset_transput_buffer (INPUT_BUFFER);
   read_pie_frame (plus_i_times, comp, ref_file, FORMAT_I_FRAME, FORMAT_ITEM_I, 'I');
   reset_transput_buffer (INPUT_BUFFER);
   read_real_pattern (imag, m, im, ref_file);
 }
 
 //! @brief Read BITS value according pattern.
 
 void read_bits_pattern (NODE_T * p, MOID_T * m, BYTE_T * item, A68_REF ref_file)
 {
   int radix = get_replicator_value (SUB_SUB (p), A68_TRUE);
   if (radix < 2 || radix > 16) {
     diagnostic (A68_RUNTIME_ERROR, p, ERROR_INVALID_RADIX, radix);
     exit_genie (p, A68_RUNTIME_ERROR);
   }
   char *z = get_transput_buffer (INPUT_BUFFER);
   ASSERT (snprintf (z, (size_t) TRANSPUT_BUFFER_SIZE, "%dr", radix) >= 0);
   set_transput_buffer_index (INPUT_BUFFER, (int) strlen (z));
   read_integral_mould (NEXT_SUB (p), m, ref_file);
   genie_string_to_value (p, m, item, ref_file);
 }
 
 //! @brief Read object with from file and store.
 
 void genie_read_real_format (NODE_T * p, MOID_T * mode, BYTE_T * item, A68_REF ref_file)
 {
   if (IS (p, GENERAL_PATTERN) && NEXT_SUB (p) == NO_NODE) {
     genie_read_standard (p, mode, item, ref_file);
   } else if (IS (p, GENERAL_PATTERN) && NEXT_SUB (p) != NO_NODE) {
     read_number_generic (p, mode, item, ref_file);
   } else if (IS (p, FIXED_C_PATTERN) || IS (p, FLOAT_C_PATTERN) || IS (p, GENERAL_C_PATTERN)) {
     read_c_pattern (p, mode, item, ref_file);
   } else if (IS (p, REAL_PATTERN)) {
     read_real_pattern (p, mode, item, ref_file);
   } else {
     pattern_error (p, mode, ATTRIBUTE (p));
   }
 }
 
 //! @brief At end of read purge all insertions.
 
 void purge_format_read (NODE_T * p, A68_REF ref_file)
 {
   BOOL_T siga;
   do {
     NODE_T *pat;
     while ((pat = get_next_format_pattern (p, ref_file, SKIP_PATTERN)) != NO_NODE) {
       format_error (p, ref_file, ERROR_FORMAT_PICTURES);
     }
     A68_FILE *file = FILE_DEREF (&ref_file);
     NODE_T *dollar = SUB (BODY (&FORMAT (file)));
     A68_FORMAT *old_fmt = (A68_FORMAT *) FRAME_LOCAL (A68_FP, OFFSET (TAX (dollar)));
     siga = (BOOL_T) ! IS_NIL_FORMAT (old_fmt);
     if (siga) {
 // Pop embedded format and proceed.
       (void) end_of_format (p, ref_file);
     }
   } while (siga);
 }
 
 //! @brief Read object with from file and store.
 
 void genie_read_standard_format (NODE_T * p, MOID_T * mode, BYTE_T * item, A68_REF ref_file, int *formats)
 {
   errno = 0;
   reset_transput_buffer (INPUT_BUFFER);
   if (mode == M_FORMAT) {
     CHECK_REF (p, ref_file, M_REF_FILE);
     A68_FILE *file = FILE_DEREF (&ref_file);
 // Forget about eventual active formats and set up new one.
     if (*formats > 0) {
       purge_format_read (p, ref_file);
     }
     (*formats)++;
     A68_FP = FRAME_POINTER (file);
     A68_SP = STACK_POINTER (file);
     open_format_frame (p, ref_file, (A68_FORMAT *) item, NOT_EMBEDDED_FORMAT, A68_TRUE);
   } else if (mode == M_PROC_REF_FILE_VOID) {
     diagnostic (A68_RUNTIME_ERROR, p, ERROR_UNDEFINED_TRANSPUT, M_PROC_REF_FILE_VOID);
     exit_genie (p, A68_RUNTIME_ERROR);
   } else if (mode == M_REF_SOUND) {
     diagnostic (A68_RUNTIME_ERROR, p, ERROR_UNDEFINED_TRANSPUT, M_REF_SOUND);
     exit_genie (p, A68_RUNTIME_ERROR);
   } else if (IS_REF (mode)) {
     CHECK_REF (p, *(A68_REF *) item, mode);
     genie_read_standard_format (p, SUB (mode), ADDRESS ((A68_REF *) item), ref_file, formats);
   } else if (mode == M_INT || mode == M_LONG_INT || mode == M_LONG_LONG_INT) {
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     if (IS (pat, GENERAL_PATTERN) && NEXT_SUB (pat) == NO_NODE) {
       genie_read_standard (pat, mode, item, ref_file);
     } else if (IS (pat, GENERAL_PATTERN) && NEXT_SUB (pat) != NO_NODE) {
       read_number_generic (pat, mode, item, ref_file);
     } else if (IS (pat, INTEGRAL_C_PATTERN)) {
       read_c_pattern (pat, mode, item, ref_file);
     } else if (IS (pat, INTEGRAL_PATTERN)) {
       read_integral_pattern (pat, mode, item, ref_file);
     } else if (IS (pat, CHOICE_PATTERN)) {
       int k = read_choice_pattern (pat, ref_file);
       if (mode == M_INT) {
         A68_INT *z = (A68_INT *) item;
         VALUE (z) = k;
         STATUS (z) = (STATUS_MASK_T) ((VALUE (z) > 0) ? INIT_MASK : NULL_MASK);
       } else {
         diagnostic (A68_RUNTIME_ERROR, p, ERROR_DEPRECATED, mode);
         exit_genie (p, A68_RUNTIME_ERROR);
       }
     } else {
       pattern_error (p, mode, ATTRIBUTE (pat));
     }
   } else if (mode == M_REAL || mode == M_LONG_REAL || mode == M_LONG_LONG_REAL) {
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     genie_read_real_format (pat, mode, item, ref_file);
   } else if (mode == M_COMPLEX) {
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     if (IS (pat, COMPLEX_PATTERN)) {
       read_complex_pattern (pat, mode, M_REAL, item, &item[SIZE (M_REAL)], ref_file);
     } else {
 // Try reading as two REAL values.
       genie_read_real_format (pat, M_REAL, item, ref_file);
       genie_read_standard_format (p, M_REAL, &item[SIZE (M_REAL)], ref_file, formats);
     }
   } else if (mode == M_LONG_COMPLEX) {
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     if (IS (pat, COMPLEX_PATTERN)) {
       read_complex_pattern (pat, mode, M_LONG_REAL, item, &item[SIZE (M_LONG_REAL)], ref_file);
     } else {
 // Try reading as two LONG REAL values.
       genie_read_real_format (pat, M_LONG_REAL, item, ref_file);
       genie_read_standard_format (p, M_LONG_REAL, &item[SIZE (M_LONG_REAL)], ref_file, formats);
     }
   } else if (mode == M_LONG_LONG_COMPLEX) {
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     if (IS (pat, COMPLEX_PATTERN)) {
       read_complex_pattern (pat, mode, M_LONG_LONG_REAL, item, &item[SIZE (M_LONG_LONG_REAL)], ref_file);
     } else {
 // Try reading as two LONG LONG REAL values.
       genie_read_real_format (pat, M_LONG_LONG_REAL, item, ref_file);
       genie_read_standard_format (p, M_LONG_LONG_REAL, &item[SIZE (M_LONG_LONG_REAL)], ref_file, formats);
     }
   } else if (mode == M_BOOL) {
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     if (IS (pat, GENERAL_PATTERN) && NEXT_SUB (pat) == NO_NODE) {
       genie_read_standard (p, mode, item, ref_file);
     } else if (IS (pat, BOOLEAN_PATTERN)) {
       if (NEXT_SUB (pat) == NO_NODE) {
         genie_read_standard (p, mode, item, ref_file);
       } else {
         A68_BOOL *z = (A68_BOOL *) item;
         int k = read_choice_pattern (pat, ref_file);
         if (k == 1 || k == 2) {
           VALUE (z) = (BOOL_T) ((k == 1) ? A68_TRUE : A68_FALSE);
           STATUS (z) = INIT_MASK;
         } else {
           STATUS (z) = NULL_MASK;
         }
       }
     } else {
       pattern_error (p, mode, ATTRIBUTE (pat));
     }
   } else if (mode == M_BITS || mode == M_LONG_BITS || mode == M_LONG_LONG_BITS) {
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     if (IS (pat, GENERAL_PATTERN) && NEXT_SUB (pat) == NO_NODE) {
       genie_read_standard (p, mode, item, ref_file);
     } else if (IS (pat, BITS_PATTERN)) {
       read_bits_pattern (pat, mode, item, ref_file);
     } else if (IS (pat, BITS_C_PATTERN)) {
       read_c_pattern (pat, mode, item, ref_file);
     } else {
       pattern_error (p, mode, ATTRIBUTE (pat));
     }
   } else if (mode == M_CHAR) {
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     if (IS (pat, GENERAL_PATTERN) && NEXT_SUB (pat) == NO_NODE) {
       genie_read_standard (p, mode, item, ref_file);
     } else if (IS (pat, STRING_PATTERN)) {
       read_string_pattern (pat, M_CHAR, ref_file);
       genie_string_to_value (p, mode, item, ref_file);
     } else if (IS (pat, CHAR_C_PATTERN)) {
       read_c_pattern (pat, mode, item, ref_file);
     } else {
       pattern_error (p, mode, ATTRIBUTE (pat));
     }
   } else if (mode == M_ROW_CHAR || mode == M_STRING) {
 // Handle these separately instead of reading [] CHAR.
     NODE_T *pat = get_next_format_pattern (p, ref_file, WANT_PATTERN);
     if (IS (pat, GENERAL_PATTERN) && NEXT_SUB (pat) == NO_NODE) {
       genie_read_standard (p, mode, item, ref_file);
     } else if (IS (pat, STRING_PATTERN)) {
       read_string_pattern (pat, mode, ref_file);
       genie_string_to_value (p, mode, item, ref_file);
     } else if (IS (pat, STRING_C_PATTERN)) {
       read_c_pattern (pat, mode, item, ref_file);
     } else {
       pattern_error (p, mode, ATTRIBUTE (pat));
     }
   } else if (IS_UNION (mode)) {
     A68_UNION *z = (A68_UNION *) item;
     genie_read_standard_format (p, (MOID_T *) (VALUE (z)), &item[A68_UNION_SIZE], ref_file, formats);
   } else if (IS_STRUCT (mode)) {
     for (PACK_T *q = PACK (mode); q != NO_PACK; FORWARD (q)) {
       BYTE_T *elem = &item[OFFSET (q)];
       genie_read_standard_format (p, MOID (q), elem, ref_file, formats);
     }
   } else if (IS_ROW (mode) || IS_FLEX (mode)) {
     MOID_T *deflexed = DEFLEX (mode);
     A68_ARRAY *arr;
     A68_TUPLE *tup;
     CHECK_INIT (p, INITIALISED ((A68_REF *) item), M_ROWS);
     GET_DESCRIPTOR (arr, tup, (A68_REF *) item);
     if (get_row_size (tup, DIM (arr)) > 0) {
       BYTE_T *base_addr = DEREF (BYTE_T, &ARRAY (arr));
       BOOL_T done = A68_FALSE;
       initialise_internal_index (tup, DIM (arr));
       while (!done) {
         ADDR_T a68_index = calculate_internal_index (tup, DIM (arr));
         ADDR_T elem_addr = ROW_ELEMENT (arr, a68_index);
         BYTE_T *elem = &base_addr[elem_addr];
         genie_read_standard_format (p, SUB (deflexed), elem, ref_file, formats);
         done = increment_internal_index (tup, DIM (arr));
       }
     }
   }
   if (errno != 0) {
     transput_error (p, ref_file, mode);
   }
 }
 
 //! @brief PROC ([] SIMPLIN) VOID read f
 
 void genie_read_format (NODE_T * p)
 {
   A68_REF row;
   POP_REF (p, &row);
   genie_stand_in (p);
   PUSH_REF (p, row);
   genie_read_file_format (p);
 }
 
 //! @brief PROC (REF FILE, [] SIMPLIN) VOID get f
 
 void genie_read_file_format (NODE_T * p)
 {
   A68_REF row;
   POP_REF (p, &row);
   CHECK_REF (p, row, M_ROW_SIMPLIN);
   A68_ARRAY *arr; A68_TUPLE *tup;
   GET_DESCRIPTOR (arr, tup, &row);
   int elems = ROW_SIZE (tup);
   A68_REF ref_file;
   POP_REF (p, &ref_file);
   CHECK_REF (p, ref_file, M_REF_FILE);
   A68_FILE *file = FILE_DEREF (&ref_file);
   CHECK_INIT (p, INITIALISED (file), M_FILE);
   if (!OPENED (file)) {
     diagnostic (A68_RUNTIME_ERROR, p, ERROR_FILE_NOT_OPEN);
     exit_genie (p, A68_RUNTIME_ERROR);
   }
   if (DRAW_MOOD (file)) {
     diagnostic (A68_RUNTIME_ERROR, p, ERROR_FILE_WRONG_MOOD, "draw");
     exit_genie (p, A68_RUNTIME_ERROR);
   }
   if (WRITE_MOOD (file)) {
     diagnostic (A68_RUNTIME_ERROR, p, ERROR_FILE_WRONG_MOOD, "write");
     exit_genie (p, A68_RUNTIME_ERROR);
   }
   if (!GET (&CHANNEL (file))) {
     diagnostic (A68_RUNTIME_ERROR, p, ERROR_CHANNEL_DOES_NOT_ALLOW, "getting");
     exit_genie (p, A68_RUNTIME_ERROR);
   }
   if (!READ_MOOD (file) && !WRITE_MOOD (file)) {
     if (IS_NIL (STRING (file))) {
       if ((FD (file) = open_physical_file (p, ref_file, A68_READ_ACCESS, 0)) == A68_NO_FILE) {
         open_error (p, ref_file, "getting");
       }
     } else {
       FD (file) = open_physical_file (p, ref_file, A68_READ_ACCESS, 0);
     }
     DRAW_MOOD (file) = A68_FALSE;
     READ_MOOD (file) = A68_TRUE;
     WRITE_MOOD (file) = A68_FALSE;
     CHAR_MOOD (file) = A68_TRUE;
   }
   if (!CHAR_MOOD (file)) {
     diagnostic (A68_RUNTIME_ERROR, p, ERROR_FILE_WRONG_MOOD, "binary");
     exit_genie (p, A68_RUNTIME_ERROR);
   }
 // Save stack state since formats have frames.
   ADDR_T pop_fp = FRAME_POINTER (file), pop_sp = STACK_POINTER (file);
   FRAME_POINTER (file) = A68_FP;
   STACK_POINTER (file) = A68_SP;
 // Process [] SIMPLIN.
   if (BODY (&FORMAT (file)) != NO_NODE) {
     open_format_frame (p, ref_file, &FORMAT (file), NOT_EMBEDDED_FORMAT, A68_FALSE);
   }
   if (elems <= 0) {
     return;
   }
   int elem_index = 0, formats = 0;
   BYTE_T *base_address = DEREF (BYTE_T, &ARRAY (arr));
   for (int k = 0; k < elems; k++) {
     A68_UNION *z = (A68_UNION *) & (base_address[elem_index]);
     MOID_T *mode = (MOID_T *) (VALUE (z));
     BYTE_T *item = (BYTE_T *) & (base_address[elem_index + A68_UNION_SIZE]);
     genie_read_standard_format (p, mode, item, ref_file, &formats);
     elem_index += SIZE (M_SIMPLIN);
   }
 // Empty the format to purge insertions.
   purge_format_read (p, ref_file);
   BODY (&FORMAT (file)) = NO_NODE;
 // Forget about active formats.
   A68_FP = FRAME_POINTER (file);
   A68_SP = STACK_POINTER (file);
   FRAME_POINTER (file) = pop_fp;
   STACK_POINTER (file) = pop_sp;
 }
     

© 2023 J.M. van der Veer

jmvdveer@xs4all.nl