cobol: Corrected FUNCTION CHAR and FUNCTION ORD.

The functions CHAR and ORD have been changed to correctly report on
character positions within the collation sequence.

The use of the LOW-VALUE and HIGH-VALUE figurative constants has been
corrected.

Some establishment of DISPLAY and NATIONAL encodings has been done
in anticipation of changes soon to come.

Some new testsuite tests have been added.

gcc/cobol/ChangeLog:

	* genapi.cc (parser_alphabet): Alphabet encoding.
	(parser_alphabet_use): Likewise.
	(parser_xml_parse): Use correct debugging macro; encoding.
	(parser_xml_on_exception): Likewise.
	(parser_xml_not_exception): Likewise.
	(parser_xml_end): Likewise.
	(initialize_the_data): Encoding.
	(parser_label_label): Debugging macros.
	(parser_label_goto): Likewise.
	(parser_file_add): Encoding.
	(parser_intrinsic_call_1): Special handling for __gg__char.
	(parser_intrinsic_call_2): Formatting.
	* parse.y: Response from FUNCTION ORD is flagged "unsigned".
	* symbols.cc (cbl_alphabet_t::reencode): Establish
	low_char & high_char.
	* symbols.h (struct cbl_alphabet_t): Likewise.

libgcobol/ChangeLog:

	* charmaps.cc: Encoding.
	* charmaps.h (class charmap_t): Encoding.
	* intrinsic.cc (__gg__char): Report the character at the
	collation position.
	(__gg__ord): Report the collation position of a character.
	* libgcobol.cc (struct program_state): Add encodings;
	Remove obsolete defines.
	(__gg__current_collation): New function for encoding/collation.
	(__gg__pop_program_state): Encoding.
	(__gg__init_program_state): Encoding.
	(format_for_display_internal): Handle LOW-VALUE and HIGH-VALUE.
	(__gg__compare_2): Encoding.
	(__gg__alphabet_use): Likewise.
	* libgcobol.h (__gg__current_collation): New declaration.
	* xmlparse.cc (__gg__xml_parse): Make a parameter const.

gcc/testsuite/ChangeLog:

	* cobol.dg/group2/Length_overflow__2_.out: Updated test result.
	* cobol.dg/group2/Length_overflow_with_offset__1_.out: Likewise.
	* cobol.dg/group2/Offset_overflow.out: Likewise.
	* cobol.dg/group2/CALL_with_OCCURS_DEPENDING_ON.cob: New test.
	* cobol.dg/group2/CALL_with_OCCURS_DEPENDING_ON.out: New test.
	* cobol.dg/group2/CHAR_and_ORD_with_COLLATING_sequence_-_ASCII.cob: New test.
	* cobol.dg/group2/CHAR_and_ORD_with_COLLATING_sequence_-_ASCII.out: New test.
	* cobol.dg/group2/CHAR_and_ORD_with_COLLATING_sequence_-_EBCDIC.cob: New test.
	* cobol.dg/group2/CHAR_and_ORD_with_COLLATING_sequence_-_EBCDIC.out: New test.
	* cobol.dg/group2/EC-BOUND-REF-MOD_checking_process_termination.cob: New test.
	* cobol.dg/group2/EC-BOUND-REF-MOD_checking_process_termination.out: New test.
	* cobol.dg/group2/Intrinsics_without_FUNCTION_keyword__3_.cob: New test.
	* cobol.dg/group2/Occurs_DEPENDING_ON__source_and_dest.cob: New test.
	* cobol.dg/group2/Occurs_DEPENDING_ON__source_and_dest.out: New test.
	* cobol.dg/group2/Recursive_subscripts.cob: New test.
	* cobol.dg/group2/Recursive_subscripts.out: New test.
	* cobol.dg/group2/SEARCH_ALL_with_OCCURS_DEPENDING_ON.cob: New test.
	* cobol.dg/group2/SEARCH_ALL_with_OCCURS_DEPENDING_ON.out: New test.
	* cobol.dg/group2/Subscript_by_arithmetic_expression.cob: New test.
	* cobol.dg/group2/Subscript_out_of_bounds__1_.cob: New test.
	* cobol.dg/group2/Subscript_out_of_bounds__1_.out: New test.
	* cobol.dg/group2/Subscript_out_of_bounds__2_.cob: New test.
	* cobol.dg/group2/Subscript_out_of_bounds__2_.out: New test.
	* cobol.dg/group2/Subscripted_refmods.cob: New test.
	* cobol.dg/group2/Subscripted_refmods.out: New test.
	* cobol.dg/group2/length_of_ODO_Rules_7__8A__and_8B.cob: New test.
	* cobol.dg/group2/length_of_ODO_Rules_7__8A__and_8B.out: New test.
	* cobol.dg/group2/length_of_ODO_w_-_reference_modification.cob: New test.

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