temporary strings are now freed when needed

src/basic/basic_commands/cmd_print.s

@@ -29,8 +29,9 @@ cmd_print_loop:
 
 cmd_print_after_comma:
 
-	// Now evaluate the expression
+	// Now evaluate the expression and check what to print
 
+	jsr tmpstr_free_all
 	jsr FRMEVL
 	lda VALTYP
 	bpl cmd_print_float

src/basic/board_m65/mega65_imports.s

@@ -25,6 +25,7 @@
 .label JREADST                         = KERNAL_0.JREADST
 .label plot_set                        = KERNAL_0.plot_set
 .label init_oldtxt                     = BASIC_0.init_oldtxt
+.label tmpstr_free_all_reset           = BASIC_0.tmpstr_free_all_reset
 .label rom_revision_basic_string       = BASIC_0.rom_revision_basic_string
 .label print_hex_byte                  = BASIC_0.proxy_B1_print_hex_byte
 .label print_integer                   = BASIC_0.proxy_B1_print_integer

src/basic/engine_runtime/do_new_clr_restore.s

@@ -71,10 +71,7 @@ do_clr:
 
 	// This is a good place to reset the temporary string stack
 
-	lda #$19
-	sta TEMPPT
-	lda #$16
-	sta LASTPT
+	jsr tmpstr_free_all_reset
 
 	// FALLTROUGH (confirmed on real C64 that CLR indeed resets DATPTR)
 

src/basic/engine_variables/tmpstr_free.s

@@ -67,7 +67,7 @@ tmpstr_free_loop:
 
 	sty DSCPNT+0
 	phx_trash_a
-	jsr varstr_free
+	jsr varstr_free_non_0
 	plx_trash_a
 
 	// Mark empty string as free and quit

src/basic/engine_variables/tmpstr_free_all.s

@@ -9,12 +9,32 @@ tmpstr_free_all:
 
 	ldx #$19
 
-	// XXX implement this
-
 	//FALLTROUGH
 
 tmpstr_free_all_loop:
 
-	// XXX finish, deduplicate part with CLR
+	// Free all the strings, one by one
+
+	cpx TEMPPT
+	beq tmpstr_free_all_reset
+
+	lda $00, x
+	beq !+
+
+	phx_trash_a
+	jsr varstr_free_non_0
+	plx_trash_a
+!:
+	inx
+	bne tmpstr_free_all_loop           // branch always
+
+tmpstr_free_all_reset: // entry point for CLR
+
+	// RESET TEMPPT and LASTPT to default values
+
+	lda #$19
+	sta TEMPPT
+	lda #$16
+	sta LASTPT
 	
 	rts

src/basic/engine_variables/varstr_free.s

@@ -16,9 +16,11 @@ varstr_free:
 	// Check the string size - do not do anything if 0
 
 	lda DSCPNT+0
-	bne !+
+	bne varstr_free_non_0
 	rts
-!:
+
+varstr_free_non_0: // entry point to be used when it is clear that string is not empty
+
 	// Check if string is above FRETOP (in string area)
 	// XXX move this check out of the routine