?? TITLE := 'NOS/VE:  BASIC ACCESS METHOD, TASK SERVICES' ??
MODULE bam$us_blk_undefined_rec_fap;
?? RIGHT := 110 ??

?? NEWTITLE := '    Global Declarations Referenced By This Module', EJECT ??
?? PUSH (LISTEXT := ON) ??
*copyc amc$condition_code_limits
*copyc bac$minimum_open_ring
*copyc osd$virtual_address
*copyc ame$access_validation_errors
*copyc ame$conflicting_access_level
*copyc ame$device_class_validation
*copyc ame$fap_validation_errors
*copyc ame$file_organization_errors
*copyc ame$get_program_actions
*copyc ame$get_validation_errors
*copyc ame$improper_file_id
*copyc ame$improper_random_access
*copyc ame$improper_wsl
*copyc ame$open_validation_errors
*copyc ame$put_program_actions
*copyc ame$put_validation_errors
*copyc ame$ring_validation_errors
*copyc ame$skip_program_actions
*copyc ame$skip_validation_errors
*copyc ame$unimplemented_request
*copyc ife$error_codes
*copyc amt$fap_declarations
*copyc bat$block_header
*copyc bat$block_position
*copyc bat$global_file_information
*copyc bat$positioning_info
*copyc bat$task_file_table
*copyc ost$caller_identifier
?? POP ??
*copyc pmf$job_mode
*copyc amp$set_file_instance_abnormal
*copyc baf$task_file_entry_p
*copyc bap$close
*copyc bap$fetch
*copyc bap$fetch_access_information
*copyc bap$get_segment_pointer
*copyc bap$set_segment_eoi
*copyc bap$set_segment_position
*copyc bap$store
*copyc bap$write_modified_pages
*copyc mmp$set_segment_length
*copyc osp$set_status_abnormal
*copyc bav$default_block_info
*copyc bav$default_record_info
*copyc bav$task_file_table
*copyc fmv$global_file_information
*copyc i#move
?? OLDTITLE ??
?? NEWTITLE := 'BAP$US_BLK_UNDEFINED_REC_FAP', EJECT ??

  PROCEDURE [XDCL, #GATE] bap$us_blk_undefined_rec_fap
    (    file_identifier: amt$file_identifier;
         call_block: amt$call_block;
         layer_number: amt$fap_layer_number;
     VAR status: ost$status);

    CONST
      error_text = 'BAP$US_BLK_UNDEFINED_REC_FAP';

    VAR
      at_eoi: boolean,
      block_header: ^bat$block_header,
      block_info: bat$block_info,
      block_padding_string: string (40),
      caller_id: ost$caller_identifier,
      data_ptr: ^cell,
      file_byte_address: amt$file_byte_address,
      file_instance: ^bat$task_file_entry,
      padding_length: 0 .. amc$maximum_block - 1,
      record_info: bat$record_info,
      wsa: ^cell,
      x: 0 .. amc$maximum_block - 1;

?? NEWTITLE := 'ROLLBACK_PROCEDURE', EJECT ??

    PROCEDURE rollback_procedure
      (    condition_status: ost$status);

      status := condition_status;
      file_instance^.rollback_procedure := NIL;
      EXIT bap$us_blk_undefined_rec_fap; {----->

    PROCEND rollback_procedure;
?? OLDTITLE ??
?? NEWTITLE := '[inline] GET_NEXT', EJECT ??

    PROCEDURE [INLINE] get_next;

      IF file_instance^.access_level <> amc$record THEN
        amp$set_file_instance_abnormal (file_identifier, ame$conflicting_access_level, call_block.operation,
              error_text, status);
        RETURN; {----->
      IFEND;

*copy bai$validate_read_access
      IF NOT status.normal THEN
        RETURN; {----->
      IFEND;

    /main_code_get_next/
      BEGIN
*copy   bai$get_positioning_info

        block_header := #ADDRESS (osc$min_ring, #SEGMENT (file_instance^.file_pva),
              block_info.current_block_byte_address);
        IF block_info.current_block_byte_address < file_instance^.global_file_information^.
              eoi_byte_address THEN
*copy         bai$validate_block_header
          IF NOT status.normal THEN
            EXIT /main_code_get_next/; {----->
          IFEND;
        IFEND;

        IF (record_info.file_position = amc$mid_record) AND
              (file_instance^.private_read_information = NIL) AND
              (file_instance^.global_file_information^.last_access_operation = amc$put_partial_req) THEN
          IF block_header^.block_length < file_instance^.global_file_information^.min_block_length THEN
            pad_to_minbl;
          IFEND;
          update_eoi;
        IFEND;

        IF record_info.file_position = amc$mid_record THEN
          record_info.current_byte_address := block_info.current_block_byte_address +
                #SIZE (bat$block_header) + block_header^.block_length;
        IFEND;

*copy   bai$get_eoi_check

        IF NOT at_eoi THEN
          IF record_info.current_byte_address <> block_info.current_block_byte_address THEN

{ Must be another block or would have been at eoi.
            block_info.current_block_byte_address := block_info.current_block_byte_address +
                  file_instance^.global_file_information^.max_block_size;
            record_info.current_byte_address := block_info.current_block_byte_address;
            block_header := #ADDRESS (osc$min_ring, #SEGMENT (file_instance^.file_pva),
                  block_info.current_block_byte_address);

*copy       bai$validate_block_header
            IF NOT status.normal THEN
              EXIT /main_code_get_next/; {----->
            IFEND;
          IFEND;

          record_info.bor_address := record_info.current_byte_address;
          record_info.current_byte_address := record_info.current_byte_address + #SIZE (bat$block_header);
          IF call_block.getn.working_storage_length >= block_header^.block_length THEN
            record_info.record_length := block_header^.block_length;
            record_info.file_position := amc$eor;
          ELSE
            record_info.record_length := call_block.getn.working_storage_length;
            record_info.file_position := amc$mid_record;
          IFEND;

          data_ptr := #ADDRESS (osc$min_ring, #SEGMENT (file_instance^.file_pva),
                record_info.current_byte_address);

          i#move (data_ptr, call_block.getn.working_storage_area, record_info.record_length);
          record_info.current_byte_address := record_info.current_byte_address + record_info.record_length;
        ELSE { at eoi }
          record_info.bor_address := record_info.current_byte_address;
          record_info.record_length := 0;
        IFEND; { NOT at eoi }
      END /main_code_get_next/;
*copy bai$save_positioning_info

      call_block.getn.file_position^ := record_info.file_position;
      call_block.getn.transfer_count^ := record_info.record_length;
      IF call_block.operation = amc$get_next_req THEN
        call_block.getn.byte_address^ := record_info.bor_address;
      IFEND;

    PROCEND get_next;
?? OLDTITLE ??
?? NEWTITLE := '[inline] PUT_NEXT', EJECT ??

    PROCEDURE [INLINE] put_next;

      IF file_instance^.access_level <> amc$record THEN
        amp$set_file_instance_abnormal (file_identifier, ame$conflicting_access_level, call_block.operation,
              error_text, status);
        RETURN; {----->
      IFEND;

*copy   bai$validate_write_access
      IF NOT status.normal THEN
        RETURN; {----->
      IFEND;

    /main_code_put_next/
      BEGIN
        block_info := file_instance^.global_file_information^.positioning_info.block_info;
        record_info := file_instance^.global_file_information^.positioning_info.record_info;

        IF (record_info.file_position = amc$mid_record) AND
              (file_instance^.private_read_information = NIL) AND
              (file_instance^.global_file_information^.last_access_operation = amc$put_partial_req) THEN
          block_header := #ADDRESS (osc$min_ring, #SEGMENT (file_instance^.file_pva),
                block_info.current_block_byte_address);
          IF block_header^.block_length < file_instance^.global_file_information^.min_block_length THEN
            pad_to_minbl;
          IFEND;
          update_eoi;
        IFEND;

        IF call_block.putn.working_storage_length = 0 THEN

{ A put of 0 length is basically a NO-OP, this means blanks lines will be
{ lost!  By design we cannot have a 0 length block.

          record_info.file_position := amc$eor;
          record_info.record_length := 0;
          EXIT /main_code_put_next/; {----->
        IFEND;

        IF call_block.putn.working_storage_length > file_instance^.global_file_information^.max_data_size THEN
          amp$set_file_instance_abnormal (file_identifier, ame$record_exceeds_mbl, call_block.operation,
                error_text, status);
          EXIT /main_code_put_next/; {----->
        ELSE
          record_info.record_length := call_block.putn.working_storage_length;
        IFEND;

        block_header := #ADDRESS (osc$min_ring, #SEGMENT (file_instance^.file_pva),
              block_info.current_block_byte_address);
        IF block_info.current_block_byte_address < file_instance^.global_file_information^.
              eoi_byte_address THEN
*copy     bai$validate_block_header
          IF NOT status.normal THEN
            EXIT /main_code_put_next/; {----->
          IFEND;
        IFEND;

        IF record_info.current_byte_address <> block_info.current_block_byte_address THEN
          block_info.current_block_byte_address := block_info.current_block_byte_address +
                file_instance^.global_file_information^.max_block_size;
          record_info.current_byte_address := block_info.current_block_byte_address;
        IFEND;
        record_info.bor_address := record_info.current_byte_address;
        block_header := #ADDRESS (osc$min_ring, #SEGMENT (file_instance^.file_pva),
              block_info.current_block_byte_address);

{ Check to make sure we do not go over the 2 GB file limit.

        IF file_instance^.global_file_information^.file_limit <
              record_info.current_byte_address + record_info.record_length + #SIZE (bat$block_header) THEN
          amp$set_file_instance_abnormal (file_identifier, ame$put_beyond_file_limit, call_block.operation,
                error_text, status);
          EXIT /main_code_put_next/; {----->
        IFEND;

*copy   bai$write_block_header
        data_ptr := #ADDRESS (osc$min_ring, #SEGMENT (file_instance^.file_pva),
              record_info.current_byte_address);

        i#move (call_block.putn.working_storage_area, data_ptr, record_info.record_length);

        record_info.current_byte_address := record_info.current_byte_address + record_info.record_length;
        file_instance^.instance_of_open_modified := TRUE;

        block_header^.block_length := record_info.record_length;
        IF record_info.record_length < file_instance^.global_file_information^.min_block_length THEN
          pad_to_minbl;
        IFEND;

        record_info.file_position := amc$eor;

*copy   bai$update_eoi
      END /main_code_put_next/;

      file_instance^.global_file_information^.positioning_info.block_info := block_info;
      file_instance^.global_file_information^.positioning_info.record_info := record_info;

      IF call_block.operation = amc$put_next_req THEN
        call_block.putn.byte_address^ := record_info.bor_address;
      IFEND;

    PROCEND put_next;
?? OLDTITLE ??
?? NEWTITLE := '[inline] GET_PARTIAL', EJECT ??

    PROCEDURE [INLINE] get_partial;

      IF file_instance^.access_level <> amc$record THEN
        amp$set_file_instance_abnormal (file_identifier, ame$conflicting_access_level, call_block.operation,
              error_text, status);
        RETURN; {----->
      IFEND;

*copy bai$validate_read_access
      IF NOT status.normal THEN
        RETURN; {----->
      IFEND;

      IF (call_block.getp.skip_option < LOWERVALUE (amt$skip_option)) OR
            (call_block.getp.skip_option > UPPERVALUE (amt$skip_option)) THEN
        amp$set_file_instance_abnormal (file_identifier, ame$improper_skip_option, call_block.operation,
              error_text, status);
        RETURN; {----->
      IFEND;

    /main_code_get_partial/
      BEGIN
*copy   bai$get_positioning_info

        IF (record_info.file_position = amc$mid_record) AND
              (file_instance^.private_read_information = NIL) AND
              (file_instance^.global_file_information^.last_access_operation = amc$put_partial_req) THEN
          block_header := #ADDRESS (osc$min_ring, #SEGMENT (file_instance^.file_pva),
                block_info.current_block_byte_address);
          IF block_header^.block_length < file_instance^.global_file_information^.min_block_length THEN
            pad_to_minbl;
          IFEND;
          update_eoi;
        IFEND;

        block_header := #ADDRESS (osc$min_ring, #SEGMENT (file_instance^.file_pva),
              block_info.current_block_byte_address);
        IF block_info.current_block_byte_address < file_instance^.global_file_information^.
              eoi_byte_address THEN
*copy     bai$validate_block_header
          IF NOT status.normal THEN
            EXIT /main_code_get_partial/; {----->
          IFEND;
        IFEND;

        IF ((record_info.file_position = amc$mid_record) AND
              (call_block.getp.skip_option = amc$skip_to_eor)) OR
              ((record_info.file_position = amc$eor) AND (record_info.current_byte_address <>
              block_info.current_block_byte_address)) THEN
          IF block_info.current_block_byte_address + #SIZE (bat$block_header) + block_header^.block_length <
                file_instance^.global_file_information^.eoi_byte_address THEN

            block_info.current_block_byte_address := block_info.current_block_byte_address +
                  file_instance^.global_file_information^.max_block_size;
            record_info.current_byte_address := block_info.current_block_byte_address;
            record_info.bor_address := record_info.current_byte_address;
            block_header := #ADDRESS (osc$min_ring, #SEGMENT (file_instance^.file_pva),
                  block_info.current_block_byte_address);

*copy       bai$validate_block_header
            IF NOT status.normal THEN
              EXIT /main_code_get_partial/; {----->
            IFEND;

            record_info.current_byte_address := record_info.current_byte_address + #SIZE (bat$block_header);
          ELSE

{ No more records but move to eor anyway so get_eoi_check will work.

            record_info.current_byte_address := block_info.current_block_byte_address +
                  #SIZE (bat$block_header) + block_header^.block_length;
          IFEND;
        IFEND;

*copy   bai$get_eoi_check

        IF NOT at_eoi THEN
          IF record_info.current_byte_address = block_info.current_block_byte_address THEN
            record_info.current_byte_address := record_info.current_byte_address + #SIZE (bat$block_header);
          IFEND;

          record_info.residual_record_length := record_info.bor_address + #SIZE (bat$block_header) +
                block_header^.block_length - record_info.current_byte_address;

          IF call_block.getp.working_storage_length >= record_info.residual_record_length THEN
            record_info.record_length := record_info.residual_record_length;
            record_info.file_position := amc$eor;
          ELSE
            record_info.record_length := call_block.getp.working_storage_length;
            record_info.file_position := amc$mid_record;
          IFEND;

          data_ptr := #ADDRESS (osc$min_ring, #SEGMENT (file_instance^.file_pva),
                record_info.current_byte_address);

          i#move (data_ptr, call_block.getp.working_storage_area, record_info.record_length);

          record_info.current_byte_address := record_info.current_byte_address + record_info.record_length;
          call_block.getp.transfer_count^ := record_info.record_length;
          record_info.record_length := record_info.current_byte_address - record_info.bor_address -
                #SIZE (bat$block_header);

        ELSE { at eoi }
          record_info.bor_address := record_info.current_byte_address;
          record_info.record_length := 0;
          call_block.getp.transfer_count^ := record_info.record_length;
        IFEND; { NOT at eoi }
      END /main_code_get_partial/;

*copy bai$save_positioning_info

      call_block.getp.file_position^ := record_info.file_position;
      call_block.getp.record_length^ := record_info.record_length;
      call_block.getp.byte_address^ := record_info.bor_address;

    PROCEND get_partial;
?? OLDTITLE ??
?? NEWTITLE := '[inline] PUT_PARTIAL', EJECT ??

    PROCEDURE [INLINE] put_partial;

      IF file_instance^.access_level <> amc$record THEN
        amp$set_file_instance_abnormal (file_identifier, ame$conflicting_access_level, call_block.operation,
              error_text, status);
        RETURN; {----->
      IFEND;

*copy bai$validate_write_access
      IF NOT status.normal THEN
        RETURN; {----->
      IFEND;

      IF (call_block.putp.term_option < LOWERVALUE (amt$term_option)) OR
            (call_block.putp.term_option > UPPERVALUE (amt$term_option)) THEN
        amp$set_file_instance_abnormal (file_identifier, ame$improper_term_option, call_block.operation,
              error_text, status);
        RETURN; {----->
      IFEND;

    /main_code_put_partial/
      BEGIN
        block_info := file_instance^.global_file_information^.positioning_info.block_info;
        record_info := file_instance^.global_file_information^.positioning_info.record_info;

        IF (call_block.putp.working_storage_length = 0) AND (record_info.file_position <> amc$mid_record) THEN

{ A put of 0 length is basically a NO-OP, this means blanks lines will be
{ lost!  By design we cannot have a 0 length block.
          EXIT /main_code_put_partial/; {----->
        IFEND;

        block_header := #ADDRESS (osc$min_ring, #SEGMENT (file_instance^.file_pva),
              block_info.current_block_byte_address);
        IF block_info.current_block_byte_address < file_instance^.global_file_information^.
              eoi_byte_address THEN
*copy     bai$validate_block_header
          IF NOT status.normal THEN
            EXIT /main_code_put_partial/; {----->
          IFEND;
        IFEND;

        IF ((call_block.putp.term_option = amc$start) OR (record_info.file_position <> amc$mid_record)) THEN
          IF call_block.putp.term_option = amc$continue THEN
            amp$set_file_instance_abnormal (file_identifier, ame$improper_continue, call_block.operation,
                  error_text, status);
            EXIT /main_code_put_partial/; {----->
          IFEND;

          IF record_info.file_position = amc$mid_record THEN
            IF block_header^.block_length < file_instance^.global_file_information^.min_block_length THEN
              pad_to_minbl;
            IFEND;
            update_eoi;
          IFEND;

{ Position to next block header.
          IF record_info.current_byte_address <> block_info.current_block_byte_address THEN
            block_info.current_block_byte_address := block_info.current_block_byte_address +
                  file_instance^.global_file_information^.max_block_size;
            record_info.current_byte_address := block_info.current_block_byte_address;
          IFEND;
          block_header := #ADDRESS (osc$min_ring, #SEGMENT (file_instance^.file_pva),
                block_info.current_block_byte_address);

          IF call_block.putp.working_storage_length > file_instance^.global_file_information^.
                max_data_size THEN
            amp$set_file_instance_abnormal (file_identifier, ame$record_exceeds_mbl, call_block.operation,
                  error_text, status);
            EXIT /main_code_put_partial/; {----->
          IFEND;

{ Check to make sure we do not go over the 2 GB file limit.
          IF file_instance^.global_file_information^.file_limit < record_info.current_byte_address +
                #SIZE (bat$block_header) + call_block.putp.working_storage_length THEN
            amp$set_file_instance_abnormal (file_identifier, ame$put_beyond_file_limit, call_block.operation,
                  error_text, status);
            EXIT /main_code_put_partial/; {----->
          IFEND;

*copy     bai$write_block_header
          record_info.bor_address := block_info.current_block_byte_address;

        ELSE { Record is already started.
          IF call_block.putp.working_storage_length > file_instance^.global_file_information^.max_data_size -
                block_header^.block_length THEN
            amp$set_file_instance_abnormal (file_identifier, ame$record_exceeds_mbl, call_block.operation,
                  error_text, status);
            EXIT /main_code_put_partial/; {----->
          IFEND;

{ Check to make sure we do not go over the 2 GB file limit.
          IF file_instance^.global_file_information^.file_limit <
                record_info.current_byte_address + call_block.putp.working_storage_length THEN
            amp$set_file_instance_abnormal (file_identifier, ame$put_beyond_file_limit, call_block.operation,
                  error_text, status);
            EXIT /main_code_put_partial/; {----->
          IFEND;
        IFEND;

        data_ptr := #ADDRESS (osc$min_ring, #SEGMENT (file_instance^.file_pva),
              record_info.current_byte_address);
        i#move (call_block.putp.working_storage_area, data_ptr, call_block.putp.working_storage_length);
        record_info.current_byte_address := record_info.current_byte_address +
              call_block.putp.working_storage_length;

        file_instance^.instance_of_open_modified := TRUE;
        block_header^.block_length := record_info.current_byte_address -
              (block_info.current_block_byte_address + #SIZE (bat$block_header));

        IF call_block.putp.term_option = amc$terminate THEN
          record_info.file_position := amc$eor;
          IF block_header^.block_length < file_instance^.global_file_information^.min_block_length THEN
            pad_to_minbl;
          IFEND;
*copy     bai$update_eoi
        ELSE
          record_info.file_position := amc$mid_record;
        IFEND;

        record_info.record_length := block_header^.block_length;
      END /main_code_put_partial/;

      file_instance^.global_file_information^.positioning_info.block_info := block_info;
      file_instance^.global_file_information^.positioning_info.record_info := record_info;

      call_block.putp.byte_address^ := record_info.bor_address;

    PROCEND put_partial;
?? OLDTITLE ??
?? NEWTITLE := '[inline] SKIP', EJECT ??

    PROCEDURE [INLINE] skip;

      VAR
        skip_number: integer;

      IF file_instance^.instance_attributes.static_label.file_organization <> amc$sequential THEN
        amp$set_file_instance_abnormal (file_identifier, ame$conflicting_fo, call_block.operation, error_text,
              status);
        RETURN; {----->
      ELSEIF file_instance^.access_level <> amc$record THEN
        amp$set_file_instance_abnormal (file_identifier, ame$conflicting_access_level, call_block.operation,
              error_text, status);
        RETURN; {----->
      IFEND;

*copy bai$get_positioning_info

      CASE call_block.skp.direction OF
      = amc$forward =
        IF record_info.file_position = amc$mid_record THEN
          IF record_info.current_byte_address DIV file_instance^.global_file_information^.max_block_size <>
                0 THEN

{ Not on a block_boundary so do 0 skip forward to next block_boundary or eoi.
            IF block_info.current_block_byte_address + file_instance^.global_file_information^.
                  max_block_size > file_instance^.global_file_information^.eoi_byte_address THEN
              record_info.current_byte_address := file_instance^.global_file_information^.eoi_byte_address;
            ELSE
              record_info.current_byte_address := block_info.current_block_byte_address +
                    file_instance^.global_file_information^.max_block_size;
            IFEND;
          IFEND;
          record_info.file_position := amc$eor;
        IFEND;

        IF call_block.skp.count > 0 THEN
          IF file_instance^.global_file_information^.eoi_byte_address MOD
                file_instance^.global_file_information^.max_block_size = 0 THEN
            skip_number := (file_instance^.global_file_information^.eoi_byte_address -
                  record_info.current_byte_address) DIV file_instance^.global_file_information^.
                  max_block_size;
          ELSE

{ Must add 1 to count the last incomplete block.
            skip_number := ((file_instance^.global_file_information^.eoi_byte_address -
                  record_info.current_byte_address) DIV file_instance^.global_file_information^.
                  max_block_size) + 1;
          IFEND;
          IF record_info.current_byte_address = file_instance^.global_file_information^.eoi_byte_address THEN
            skip_number := 0;
          IFEND;

          IF call_block.skp.count > skip_number THEN
            { Skip past eoi.
            record_info.current_byte_address := file_instance^.global_file_information^.eoi_byte_address;
            record_info.file_position := amc$eoi;
            file_instance^.residual_skip_count := call_block.skp.count - skip_number;
            amp$set_file_instance_abnormal (file_identifier, ame$skip_encountered_eoi, amc$skip_req,
                  'RECORDS', status);
          ELSE {can complete full skip}
            IF record_info.current_byte_address + (call_block.skp.count *
                  file_instance^.global_file_information^.max_block_size) >
                  file_instance^.global_file_information^.eoi_byte_address THEN
              record_info.current_byte_address := file_instance^.global_file_information^.eoi_byte_address;
            ELSE
              record_info.current_byte_address := record_info.current_byte_address +
                    (call_block.skp.count * file_instance^.global_file_information^.max_block_size);
            IFEND;
            record_info.file_position := amc$eor;
            file_instance^.residual_skip_count := 0;
          IFEND;
          record_info.bor_address := record_info.current_byte_address;
          block_info.current_block_byte_address := (record_info.current_byte_address DIV
                file_instance^.global_file_information^.max_block_size) *
                file_instance^.global_file_information^.max_block_size;
        ELSE
          file_instance^.residual_skip_count := call_block.skp.count;
        IFEND;

      = amc$backward =
        IF (record_info.file_position = amc$mid_record) AND
              (file_instance^.global_file_information^.max_block_size <> 0) AND
              (record_info.current_byte_address <> file_instance^.global_file_information^.eoi_byte_address)
              THEN

{ Not on a block_boundary so do 0 skip backward to block_boundary.

          record_info.current_byte_address := block_info.current_block_byte_address;
          record_info.file_position := amc$eor;
        IFEND;
        IF call_block.skp.count > 0 THEN
          IF (record_info.current_byte_address MOD file_instance^.global_file_information^.max_block_size <>
                0) THEN

{ Must be at eoi and not a block boundary.
            skip_number := record_info.current_byte_address DIV
                  file_instance^.global_file_information^.max_block_size + 1;
          ELSE
            skip_number := record_info.current_byte_address DIV
                  file_instance^.global_file_information^.max_block_size;
          IFEND;
          IF call_block.skp.count > skip_number THEN
            record_info.current_byte_address := 0;
            record_info.bor_address := 0;
            record_info.file_position := amc$boi;
            block_info.current_block_byte_address := 0;
            file_instance^.residual_skip_count := call_block.skp.count - skip_number;

            amp$set_file_instance_abnormal (file_identifier, ame$skip_encountered_boi, amc$skip_req,
                  'RECORDS', status);
          ELSE { can skip back requested records }
            IF (record_info.current_byte_address MOD file_instance^.global_file_information^.max_block_size <>
                  0) AND (record_info.current_byte_address = file_instance^.global_file_information^.
                  eoi_byte_address) THEN

{ must be at eoi and not on a block boundary.  Move to block_boundary as first skip.
              record_info.current_byte_address := block_info.current_block_byte_address;
              record_info.current_byte_address := record_info.current_byte_address -
                    ((call_block.skp.count - 1) * file_instance^.global_file_information^.max_block_size);
            ELSE
              record_info.current_byte_address := record_info.current_byte_address -
                    (call_block.skp.count * file_instance^.global_file_information^.max_block_size);
            IFEND;
            record_info.bor_address := record_info.current_byte_address;
            record_info.file_position := amc$eor;
            block_info.current_block_byte_address := record_info.current_byte_address;
            file_instance^.residual_skip_count := 0;
          IFEND;
          IF file_instance^.residual_skip_count <> 0 THEN
            amp$set_file_instance_abnormal (file_identifier, ame$skip_encountered_boi, amc$skip_req,
                  'RECORDS', status);
          IFEND;
        ELSE
          file_instance^.residual_skip_count := call_block.skp.count;
        IFEND;
      ELSE
      CASEND;

*copy bai$save_positioning_info

      call_block.skp.file_position^ := record_info.file_position;

    PROCEND skip;
?? OLDTITLE ??
?? NEWTITLE := '[inline] SEEK_DIRECT', EJECT ??

    PROCEDURE [INLINE] seek_direct;

      IF file_instance^.access_level <> amc$record THEN
        amp$set_file_instance_abnormal (file_identifier, ame$conflicting_access_level, call_block.operation,
              error_text, status);
        RETURN; {----->
      IFEND;

      IF file_byte_address MOD file_instance^.global_file_information^.max_block_size <> 0 THEN
        amp$set_file_instance_abnormal (file_identifier, ame$improper_seek_address, call_block.operation,
              error_text, status);
        RETURN; {----->
      IFEND;

*copy bai$seek_validation
      IF NOT status.normal THEN
        RETURN; {----->
      IFEND;

*copy bai$get_positioning_info

      IF file_byte_address = record_info.current_byte_address THEN
        RETURN; {-----> { A seek to the same address is a nop.
      IFEND;

      record_info.bor_address := file_byte_address;
      record_info.current_byte_address := file_byte_address;
      record_info.file_position := amc$eor;
      block_info.current_block_byte_address := (record_info.current_byte_address DIV
            file_instance^.global_file_information^.max_block_size) *
            file_instance^.global_file_information^.max_block_size;

*copy bai$save_positioning_info

    PROCEND seek_direct;
?? OLDTITLE ??
?? NEWTITLE := 'TERMINATE_RECORD', EJECT ??

    PROCEDURE terminate_record;

      IF (file_instance^.private_read_information = NIL) AND
            (file_instance^.global_file_information^.positioning_info.record_info.file_position =
            amc$mid_record) AND (file_instance^.global_file_information^.last_access_operation =
            amc$put_partial_req) THEN

{ If last operation was a put_partial then the record must be
{ terminated before repositioning.

        block_info := file_instance^.global_file_information^.positioning_info.block_info;
        record_info := file_instance^.global_file_information^.positioning_info.record_info;

        block_header := #ADDRESS (osc$min_ring, #SEGMENT (file_instance^.file_pva),
              block_info.current_block_byte_address);

        IF block_header^.block_length < file_instance^.global_file_information^.min_block_length THEN
          pad_to_minbl;
        IFEND;
        update_eoi;
        file_instance^.global_file_information^.positioning_info.block_info := block_info;
        file_instance^.global_file_information^.positioning_info.record_info := record_info;
      IFEND;

    PROCEND terminate_record;
?? OLDTITLE ??
?? NEWTITLE := 'REPLACE_RECORD', EJECT ??

    PROCEDURE replace_record;

      IF file_instance^.access_level <> amc$record THEN
        amp$set_file_instance_abnormal (file_identifier, ame$conflicting_access_level, call_block.operation,
              error_text, status);
        RETURN; {----->
      ELSEIF file_instance^.instance_attributes.static_label.file_organization <> amc$sequential THEN
        amp$set_file_instance_abnormal (file_identifier, ame$file_organization_conflict, call_block.operation,
              error_text, status);
        RETURN; {----->
      ELSEIF NOT ((file_instance^.global_file_information^.positioning_info.record_info.file_position <>
            amc$mid_record) AND (file_instance^.global_file_information^.positioning_info.record_info.
            current_byte_address > 0)) THEN
        amp$set_file_instance_abnormal (file_identifier, ame$improper_file_position, call_block.operation,
              error_text, status);
        RETURN; {----->
      ELSEIF (call_block.replace.working_storage_length < 0) OR
            (call_block.replace.working_storage_length > UPPERVALUE (amt$working_storage_length)) THEN
        amp$set_file_instance_abnormal (file_identifier, ame$improper_wsl_value, call_block.operation,
              error_text, status);
        RETURN; {----->
      ELSEIF call_block.replace.working_storage_length > file_instance^.global_file_information^.
            max_data_size THEN
        amp$set_file_instance_abnormal (file_identifier, ame$record_exceeds_mbl, call_block.operation,
              error_text, status);
        RETURN; {----->
      ELSEIF caller_id.ring > file_instance^.instance_attributes.static_label.ring_attributes.r1 THEN
        amp$set_file_instance_abnormal (file_identifier, ame$ring_validation_error, call_block.operation,
              error_text, status);
        RETURN; {----->
      ELSEIF NOT (pfc$modify IN file_instance^.instance_attributes.dynamic_label.access_mode) THEN
        amp$set_file_instance_abnormal (file_identifier, ame$improper_access_attempt, call_block.operation,
              ' MODIFY', status);
        RETURN; {----->
      IFEND;

      block_info := file_instance^.global_file_information^.positioning_info.block_info;
      record_info := file_instance^.global_file_information^.positioning_info.record_info;

      block_header := #ADDRESS (osc$min_ring, #SEGMENT (file_instance^.file_pva),
            block_info.current_block_byte_address);
      IF block_header^.block_length <> call_block.replace.working_storage_length THEN
        amp$set_file_instance_abnormal (file_identifier, ame$record_unequal_to_previous, call_block.operation,
              error_text, status);
        RETURN; {----->
      IFEND;

      record_info.current_byte_address := block_info.current_block_byte_address + #SIZE (bat$block_header);
      record_info.bor_address := record_info.current_byte_address;

      data_ptr := #ADDRESS (osc$min_ring, #SEGMENT (file_instance^.file_pva),
            record_info.current_byte_address);

      i#move (call_block.replace.working_storage_area, data_ptr, call_block.replace.working_storage_length);

      record_info.current_byte_address := record_info.current_byte_address +
            call_block.replace.working_storage_length;
      record_info.file_position := amc$eor;
      record_info.record_length := call_block.replace.working_storage_length;
      file_instance^.instance_of_open_modified := TRUE;

      file_instance^.global_file_information^.positioning_info.block_info := block_info;
      file_instance^.global_file_information^.positioning_info.record_info := record_info;

    PROCEND replace_record;
?? OLDTITLE ??
?? NEWTITLE := 'PAD_TO_MINBL', EJECT ??

    PROCEDURE pad_to_minbl;

      block_padding_string := '^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^';
      padding_length := file_instance^.global_file_information^.min_block_length - block_header^.block_length;

      REPEAT
        wsa := #ADDRESS (osc$min_ring, #SEGMENT (file_instance^.file_pva), record_info.current_byte_address);
        IF #SIZE (block_padding_string) > padding_length THEN
          x := padding_length;
        ELSE
          x := #SIZE (block_padding_string);
        IFEND;
        i#move (^block_padding_string, wsa, x);
        padding_length := padding_length - x;
        record_info.current_byte_address := record_info.current_byte_address + x;
      UNTIL padding_length = 0;
      block_header^.block_length := file_instance^.global_file_information^.min_block_length;
      block_info.current_block_length := block_header^.block_length;

    PROCEND pad_to_minbl;
?? OLDTITLE ??
?? NEWTITLE := 'UPDATE_EOI', EJECT ??

    PROCEDURE update_eoi;

*copy bai$update_eoi

    PROCEND update_eoi;
?? OLDTITLE ??
?? EJECT ??

    #CALLER_ID (caller_id);
    status.normal := TRUE;

  /process_fap_request/
    BEGIN
      file_instance := baf$task_file_entry_p (file_identifier);
      IF file_instance = NIL THEN
        osp$set_status_abnormal (amc$access_method_id, ame$improper_file_id, error_text, status);
        RETURN; {----->
      IFEND;

      file_instance^.rollback_procedure := ^rollback_procedure;
      CASE call_block.operation OF
      = amc$get_next_req =
        get_next;
      = amc$put_next_req =
        put_next;
      = amc$get_partial_req =
        get_partial;
      = amc$put_partial_req =
        put_partial;
      = amc$open_req =
*copy   bai$get_positioning_info
        block_info.current_block_byte_address := (record_info.current_byte_address DIV
              file_instance^.global_file_information^.max_block_size) *
              file_instance^.global_file_information^.max_block_size;
*copy   bai$save_positioning_info
      = amc$close_req =
        terminate_record;
        bap$close (file_identifier, status);
        EXIT /process_fap_request/; {----->
      = amc$rewind_req =
        terminate_record;
*copy   bai$rewind
      = amc$seek_direct_req =
        file_byte_address := call_block.seekd.byte_address;
        seek_direct;
      = amc$get_direct_req =
        file_byte_address := call_block.getd.byte_address;
        seek_direct;
        IF NOT status.normal THEN
          IF status.condition = ame$position_beyond_eoi THEN
            status.condition := ame$input_after_eoi;
          IFEND;
        ELSE
          get_next;
        IFEND;
      = amc$put_direct_req =
        file_byte_address := call_block.putd.byte_address;
        seek_direct;
        IF status.normal THEN
          put_next;
        IFEND;
      = amc$skip_req =
        IF call_block.skp.unit <> amc$skip_record THEN
          amp$set_file_instance_abnormal (file_identifier, ame$unsupported_skip, call_block.operation, ' ',
                status);
        ELSE
          terminate_record;
          skip;
        IFEND;
      = amc$fetch_access_information_rq =
        bap$fetch_access_information (file_identifier, call_block, layer_number, status);
        EXIT /process_fap_request/; {----->
      = amc$fetch_req =
        bap$fetch (file_identifier, call_block, layer_number, status);
        EXIT /process_fap_request/; {----->
      = amc$get_segment_pointer_req =
        bap$get_segment_pointer (file_identifier, call_block, layer_number, status);
      = amc$set_segment_eoi_req =
        bap$set_segment_eoi (file_identifier, call_block, layer_number, status);
      = amc$set_segment_position_req =
        bap$set_segment_position (file_identifier, call_block, layer_number, status);
      = amc$replace_req =
        replace_record;
      = amc$store_req =
        bap$store (file_identifier, call_block, layer_number, status);
      = amc$write_end_partition_req =
        amp$set_file_instance_abnormal (file_identifier, ame$unsupported_operation, call_block.operation,
              error_text, status);
      = amc$write_tape_mark_req, amc$close_volume_req =
        amp$set_file_instance_abnormal (file_identifier, ame$improper_device_class, call_block.operation,
              'MASS_STORAGE', status);
      = amc$flush_req =
        bap$write_modified_pages (file_instance, file_identifier, status);
      = ifc$fetch_terminal_req, ifc$store_terminal_req =
        IF pmf$job_mode () = jmc$batch THEN
          osp$set_status_abnormal (ifc$interactive_facility_id, ife$current_job_not_interactive,
                'FETCH/STORE_TERMINAL_REQ', status);
        ELSE
          amp$set_file_instance_abnormal (file_identifier, ame$improper_device_class, call_block.operation,
                'MASS STORAGE', status);
        IFEND;
      ELSE
        amp$set_file_instance_abnormal (file_identifier, ame$unimplemented_request, call_block.operation,
              ' for sequential or byte addressable files', status);
      CASEND;

      IF file_instance^.private_read_information = NIL THEN
        IF status.normal THEN
          file_instance^.global_file_information^.error_status := 0;
        ELSE
          file_instance^.global_file_information^.error_status := status.condition;
        IFEND;
        file_instance^.global_file_information^.last_access_operation := call_block.operation;
      ELSE
        IF status.normal THEN
          file_instance^.private_read_information^.error_status := 0;
        ELSE
          file_instance^.private_read_information^.error_status := status.condition;
        IFEND;
        file_instance^.private_read_information^.last_access_operation := call_block.operation;
      IFEND;
    END /process_fap_request/;

    file_instance^.rollback_procedure := NIL;

  PROCEND bap$us_blk_undefined_rec_fap;
?? OLDTITLE ??
MODEND bam$us_blk_undefined_rec_fap;
