add chline, cvline functions

libsrc/agat/chline.s

@@ -0,0 +1,33 @@
+;
+; Ullrich von Bassewitz, 08.08.1998
+; Colin Leroy-Mira, 26.05.2025
+; Konstantin Fedorov, 12.06.2025
+;
+; void chlinexy (unsigned char x, unsigned char y, unsigned char length);
+; void chline (unsigned char length);
+;
+
+        .export         _chlinexy, _chline, chlinedirect
+        .import         gotoxy, putchar
+
+        .include        "zeropage.inc"
+
+_chlinexy:
+        pha                     ; Save the length
+        jsr     gotoxy          ; Call this one, will pop params
+        pla                     ; Restore the length and run into _chline
+
+_chline:
+        ldx     #$1B            ; horizontal line character
+
+chlinedirect:
+        stx     tmp1
+        cmp     #$00            ; Is the length zero?
+        beq     done            ; Jump if done
+        sta     tmp2
+:       lda     tmp1            ; Screen code
+        jsr     putchar         ; Direct output
+        dec     tmp2
+        bne     :-
+done:   rts
+