1.0-build19

News in version 1.0.19:

• Preprocessor (%define/%macro/%include) extracted from ASSEMBLR.C into a new MACRO.C / MACRO.H module. The public surface is the pp_* family (pp_open_source, pp_close_source, pp_reset_pass, pp_next_line, pp_include, pp_macro_slurp, pp_skip_macro_body, pp_macro_invoke, pp_push_line). t_macrobody / t_macroline now live in MACRO.H. ASSEMBLR.C lost ~340 lines and no longer touches current_file or the include / expansion stacks directly. Makefiles updated to add MACRO.C to both the DOS Watcom (wcl) and the POSIX (cc) builds.
• P1 (DOS stack safety): the 4 KB macro-substitution buffer in pp_macro_invoke used to live on the C stack. On Watcom DOS the default stack is ~4 KB, so a single macro call burned the entire stack. The buffer is now a module-static char[4096] in MACRO.C; pp_macro_invoke is not re-entrant, so one buffer is sufficient and safe.
• P3 (cycle guard for %define recursion): a body that named itself (%define A A) or chained into a cycle (%define A B + %define B A) used to recurse through get_const() until the host stack was exhausted. Added a 64-level recursion guard; on overflow get_const emits "%define expansion of '' too deep (cycle?)" and returns 0. Tests test_asm_define_cycle_guard / test_asm_define_mutual_cycle_guard cover both paths.
• Macro recursion guard. The same situation existed for %macro: a macro that invoked itself (%macro M 0 / M / %endmacro then M) would push body lines and save frames indefinitely. pp_macro_invoke now counts in-flight invocations via the macro_save_head linked list and rejects the invocation when 64 are already active, emitting "Macro recursion of '' too deep (cycle?)". pp_macro_invoke's signature gained a name parameter so the diagnostic can point at the offending macro. Tests test_asm_macro_recursion_guard / test_asm_macro_mutual_recursion_guard cover direct and indirect cycles.
• Removed the per-instruction-line caller code that touched include_stack_head / current_file directly -- end-of-pass cleanup now goes through pp_close_source(), and the pass-1 consume-macro-body loop became one call to pp_skip_macro_body().

News in version 1.0.18:

• Added %include directive. %include "path" (or unquoted %include path) suspends reading of the current file, opens the named file, and resumes on EOF -- equivalent to inlining the file's contents at the directive line. Implementation: a linked-list stack of t_include_frame entries saves the parent FILE*, line number, and inputname at each push, restores on pop. There is no fixed cap on the number of include frames per se, but a reasonable depth limit (INCLUDE_MAX_DEPTH = 8) catches cyclic includes.
• Diagnostics inside an included file now attribute the file name and line to the included file, not the parent. out_msg() prints inputname/linenr verbatim; %include updates both on push and pop.
• Restrictions: %macro bodies must lie within one file (the slurp loop reads raw fgets from the current file and does not follow include boundaries). Section state is not saved/restored across an include.

News in version 1.0.17:

• Local labels (NASM dot-prefix). A label starting with '.' is qualified to . using the most recent non-local label as parent, so the same .loop / .done can be reused in every procedure. Parent resets on SECTION switch and at start of each pass. Locals cannot be EXPORTed or IMPORTed.
• Macros: %define and %macro. %define is single-line text substitution at operand position; bodies are re-evaluated per use so expressions like 'BASE+0x10' work. %macro supports 0..9 positional args (%1..%9), per-invocation labels (%%name → @@id.name). Nested %macro is rejected. All preprocessor storage uses linked lists: there is no compile-time cap on macro count, %define count, body line count, expansion-stack depth, or nesting depth -- the only hard limit is available heap.
• t_constant gained an 'extra' pointer that holds the body for CONST_DEFINE_TEXT entries (char *) and the t_macrobody for CONST_MACRO entries. Removed the side-table arrays define_bodies[256]/macro_bodies[256]/macro_stack[1024]/ macro_saved_global[32] and their hard caps.
• %undef removes a %define entry.
• Bug fix on 16-bit hosts: REL8/REL16 displacement math used 'int' (16-bit signed) on both sides, so target addresses >= 0x8000 wrapped to negative and produced spurious "Too long jump" errors. All offset/value math now uses int32_t from <stdint.h>; get_const(), get_number(), get_dword(), t_constant.value, t_address.disp, and the emit_* helpers are int32_t.
• Bug fix on 16-bit hosts: add_const() value parameter was 'int' (16-bit signed), so label values >= 0x8000 narrowed to negative through the parameter and sign-extended into c->value (int32_t). Widened the param to int32_t and dropped the (int)cur_offset() casts at all call sites. Regression test test_asm_label_value_high_16bit asserts a label at org=0x9000 round-trips with the high bit preserved.
• Symbol-table find_const() now gates strcmp behind a uint16_t hash compare; t_constant.hash narrowed to 16 bits. Cheap prefilter (~1/65536 false positives) before the string comparison. add_const, find_const, remove_const all use the same hash type.
• New remove_const() helper in EXPR.C — needed by %undef and useful as a primitive for any future macro/define undefinition flow.

1.0-build16

Main reason of release: bugfix for 1.0-build15 (missed files).

• Added IMPORT directive (RDF target). Declares external symbols supplied at link time; each name becomes a RDFREC_IMPORT record with a unique segid starting at 3. Imported names are usable in MOV imm16, MOV [mem], DW / DD, CALL rel16, JMP rel16, and SEG operand forms (RDFREC_RELOC absolute or relative per context). JMP SHORT / Jcc / LOOP to an import is rejected (out of range).
• Added JMP FAR / CALL FAR. Direct form (JMP FAR ) emits EA / 9A + offset16:segment16 with a RDFREC_RELOC on the offset slot and a RDFREC_SEGRELOC on the segment slot — RDF-only. Indirect form (JMP FAR [mem]) emits FF /5 (jmp) or FF /3 (call) and works for any target. Register operands and numeric operands are rejected.
• Instruction matcher tightened: user-written SHORT / NEAR / FAR is now a hard constraint. Previously a table entry with LEX_NONE would silently absorb any user-specified lex2, so e.g. JMP FAR fell through to the near FF /4 form. Now unsupported forms produce "Syntax error".

1.0-build15

Added support target RDF (RDOFF2) with relocations (also segment relocation)
Remove target OVL
Added SECTION [.text .data .bss]
Added SEG label
Added few tests

1.0-build14

Merge branch 'master' of https://github.com/DosWorld/msa2

1.0-build13

Update README.MD