fix: Add workaround for GnuCOBOL codegen bug on Aarch64

This is a workaround for issue #260. GnuCOBOL with -debug generates
different C code on x86_64 and aarch64, with the latter leading to
broken variable access when multiple tables are involved in the same
statement. This is due to differences in support for unaligned memory
accesses between the two architectures.

src/commands.cob

@@ -67,6 +67,7 @@ WORKING-STORAGE SECTION.
     01 COMMAND-INDEX            BINARY-LONG UNSIGNED.
     01 PTR                      PROGRAM-POINTER.
     01 PRINT-USAGE              BINARY-CHAR UNSIGNED.
+    01 PART-NAME                PIC X(256).
 LINKAGE SECTION.
     01 LK-CLIENT-ID             BINARY-LONG UNSIGNED.
     01 LK-INPUT                 PIC X(256).
@@ -120,8 +121,9 @@ PROCEDURE DIVISION USING LK-CLIENT-ID LK-INPUT LK-INPUT-LENGTH.
     END-IF
 
     *> Handle the command by looking up the first part
+    MOVE PART-VALUE(1)(1:PART-LENGTH(1)) TO PART-NAME
     PERFORM VARYING COMMAND-INDEX FROM 1 BY 1 UNTIL COMMAND-INDEX > COMMAND-COUNT
-        IF COMMAND-NAME(COMMAND-INDEX) = PART-VALUE(1)(1:PART-LENGTH(1))
+        IF COMMAND-NAME(COMMAND-INDEX) = PART-NAME
             MOVE COMMAND-PTR-EXECUTE(COMMAND-INDEX) TO PTR
             MOVE 0 TO PRINT-USAGE
             CALL PTR USING LK-CLIENT-ID PARTS PRINT-USAGE
@@ -140,7 +142,7 @@ PROCEDURE DIVISION USING LK-CLIENT-ID LK-INPUT LK-INPUT-LENGTH.
 
     *> Command not found
     INITIALIZE BUFFER
-    STRING "Unknown command: " PART-VALUE(1)(1:PART-LENGTH(1)) INTO BUFFER
+    STRING "Unknown command: " FUNCTION TRIM(PART-NAME) INTO BUFFER
     CALL "SendChatMessage" USING LK-CLIENT-ID BUFFER OMITTED
 
     GOBACK.