Starting writing an ed implementation

Makefile

@@ -15,7 +15,7 @@ $(BUILD_DIR)/crawos.iso: floppy_image
 # Floppy image
 # Fat12
 floppy_image: $(BUILD_DIR)/crawos.img
-$(BUILD_DIR)/crawos.img: bootloader kernel
+$(BUILD_DIR)/crawos.img: bootloader kernel check-fat83
 	mkdir -p disk_images
 	dd if=/dev/zero of=$(BUILD_DIR)/crawos.img bs=512 count=2880 # Use dd to make a disk image
 	mkfs.fat -F 12 -n "CRAWOS" $(BUILD_DIR)/crawos.img # Format the disk image with fat12
@@ -36,6 +36,11 @@ $(BUILD_DIR)/kernel.bin:
 	mkdir -p disk_images
 	$(ASM) $(SRC_DIR)/kernel/kernel.asm -f bin -o $ $(BUILD_DIR)/kernel.bin
 
+check-fat83:
+	@echo "Checking filenames for FAT 8.3 compliance..."
+	@find ./data -type f | awk -F/ '{print $$NF}' | \
+	awk -F. 'length($$1)>8 || length($$2)>3 || NF>2 {print "Invalid FAT 8.3 filename:", $$0; bad=1} END{exit bad}'
+
 # Clean
 clean:
 	rm -f disk_images/*

data/README.md

@@ -1,9 +1,14 @@
-Kernel written in Assmebly
-I'm using a modified JazzOS Bootloader
+# What is this?
+This is a simple implementation of a computer kernel
+written in pure x86 assembly with features including 
+- Read/Write disk operations
+- The ability to boot from the BIOS using the JazzOS Bootloader
+- A modified MikeOS BASIC interpreter
+- A functional POSIX inspired CLI
 
-Commands:
-CAT
-HELP
-CLEAR
-REBOOT
-PONG
+# Commands
+- CAT <filename>: outputs the contents of the file.
+- LS: outputs a list of files on the system .
+- CLEAR: clears the screen.
+- REBOOT: or esc reboots the system
+- BAS <filename>: runs a basic script.

data/hello.bas

@@ -1,2 +1,2 @@
-PORT OUT 80 5
+PRINT "Hello World"
 END

data/var.cws

@@ -1 +0,0 @@
-x = 5

source/kernel/data.asm

@@ -34,6 +34,7 @@ reboot_string: db 'REBOOT', 0
 basic_string: db 'BAS', 0
 cat_string: db 'CAT', 0
 ls_string: db 'LS', 0
+ed_string: db 'ED', 0
 help_text: db 'This is for Cowards:\n"LS" to list the directory,\n"CAT" to output the contents of a file,\n"BAS" to run a basic script,\n"HELP" for this helpful text,\n"CLEAR" to clear the screen,\n"REBOOT" or esc to reboot\n', 0
 basic_text: db 'BASIC PROGRAM BEGUN:\n', 0
 command_result_text: db 'You typed: ', 0

source/kernel/features/basic.asm

@@ -842,14 +842,14 @@ do_break:
 do_call:
 	call get_token
 	cmp ax, NUMBER
-	je .is_number
+	je .check_is_number
 
 	mov ax, 0
 	mov byte al, [token]
 	call get_var
 	jmp .execute_call
 
-.is_number:
+.check_is_number:
 	mov si, token
 	call string_cast_to_int
 
@@ -1325,7 +1325,7 @@ do_for:
 	cmp ax, NUMBER
 	jne .error
 
-.second_is_number:
+.second_check_is_number:
 	mov si, token					; Get target number
 	call string_cast_to_int
 	jmp .continue2
@@ -1625,7 +1625,7 @@ do_if:
 	je .equals_char
 
 	mov byte al, [token]
-	call is_letter
+	call check_is_letter
 	jc .equals_var
 
 	mov si, token				; Otherwise it's, eg 'X = 1' (a number)
@@ -1711,7 +1711,7 @@ do_if:
 .greater:
 	call get_token				; Greater than a variable or number?
 	mov byte al, [token]
-	call is_letter
+	call check_is_letter
 	jc .greater_var
 
 	mov si, token				; Must be a number here...
@@ -1736,7 +1736,7 @@ do_if:
 .less:
 	call get_token
 	mov byte al, [token]
-	call is_letter
+	call check_is_letter
 	jc .less_var
 
 	mov si, token
@@ -2636,7 +2636,7 @@ do_peekint:
 	cmp ax, NUMBER
 	jne .error
 	
-.address_is_number:
+.address_check_is_number:
 	mov si, token
 	call string_cast_to_int
 	jmp .load_data
@@ -3770,14 +3770,14 @@ do_string:
 	call get_token			; Now there should be a number
 	
 	cmp ax, NUMBER
-	je .third_is_number
+	je .third_check_is_number
 	
 	cmp ax, VARIABLE
 	je .third_is_variable
 	
 	jmp .error
 	
-.third_is_number:	
+.third_check_is_number:	
 	mov si, token
 	call string_cast_to_int
 	jmp .got_number	
@@ -3984,7 +3984,7 @@ get_token:
 	cmp al, ' '
 	je .newline
 
-	call is_number
+	call check_is_number
 	jc get_number_token
 
 	cmp al, '"'
@@ -4030,7 +4030,7 @@ get_number_token:
 	je .done
 	cmp al, ' '
 	je .done
-	call is_number
+	call check_is_number
 	jc .fine
 
 	mov si, err_char_in_num
@@ -4153,7 +4153,7 @@ get_string_token:
 
 .is_not_string:
 	mov byte al, [token]
-	call is_letter
+	call check_is_letter
 	jc .is_var
 
 	mov ax, UNKNOWN
@@ -4164,37 +4164,6 @@ get_string_token:
 	ret
 
 
-; ------------------------------------------------------------------
-; Set carry flag if AL contains ASCII number
-
-is_number:
-	cmp al, 48
-	jl .not_number
-	cmp al, 57
-	jg .not_number
-	stc
-	ret
-.not_number:
-	clc
-	ret
-
-
-; ------------------------------------------------------------------
-; Set carry flag if AL contains ASCII letter
-
-is_letter:
-	cmp al, 65
-	jl .not_letter
-	cmp al, 90
-	jg .not_letter
-	stc
-	ret
-
-.not_letter:
-	clc
-	ret
-
-
 ; ------------------------------------------------------------------
 ; Print error message and quit out
 

source/kernel/features/cli.asm

@@ -30,14 +30,14 @@ os_read_cli:
 	mov di, help_string
 	call os_compare_strings
 	cmp cl, 1
-	je help
+	je .help
 
 	; Clear screen
 	mov si, user_input
 	mov di, clear_string
 	call os_compare_strings
 	cmp cl, 1
-	je clear
+	je .clear
 
 	; Reboot
 	mov si, user_input
@@ -51,21 +51,28 @@ os_read_cli:
 	mov di, basic_string
 	call os_compare_strings
 	cmp cl, 1
-	je basic
+	je .basic
 
 	; Cat
 	mov si, user_input
 	mov di, cat_string
 	call os_compare_strings
 	cmp cl, 1
-	je cat
+	je .cat
 
     ; LS
 	mov si, user_input
 	mov di, ls_string
 	call os_compare_strings
 	cmp cl, 1
-	je ls
+	je .ls
+
+    ; ED
+	mov si, user_input
+	mov di, ed_string
+	call os_compare_strings
+	cmp cl, 1
+	je .ed
 	
 	jmp .unkown
 
@@ -80,21 +87,25 @@ os_read_cli:
 	popa
 	call os_start_cli
 
-clear:
+.clear:
 	call os_set_text_mode
 	call os_read_cli.finish
 
-help:
+.help:
 	mov si, help_text
 	call os_print_string
 	call os_read_cli.finish
 
-basic:
+.basic:
 	call util_basic
 	call os_read_cli.finish
-cat:
+.cat:
    call util_cat
    call os_read_cli.finish
-ls:
+.ls:
    call util_ls
    call os_read_cli.finish
+.ed:
+   call util_ed
+   call os_read_cli.finish
+

source/kernel/features/keyboard.asm

@@ -32,7 +32,6 @@ keyboard_display_input:
 	pusha
 	mov di, ax
 	mov ax, bx
-	mov bx,20 
 
 	.check_key_pressed:
 		call os_read_input

source/kernel/features/text.asm

@@ -68,6 +68,9 @@ text_print_raw:
 		int 10h
 		mov al, 0Dh
 		int 10h
+		push ax
+		call os_read_input ; wait until key is pressed until it prints the next line
+		pop ax
 		jmp .repeat
 	.finish:
 		popa

source/kernel/features/utils.asm

@@ -43,3 +43,13 @@ util_basic:
 
 	popa
 	ret
+
+util_ed:
+	pusha
+	call disk_load_root
+	call disk_load_file
+	
+	call ed
+	
+	popa
+	ret

source/kernel/kernel.asm

@@ -33,13 +33,19 @@ halt:
 	%INCLUDE "source/kernel/features/sound.asm"
 	%INCLUDE "source/kernel/features/disk.asm"
 	%INCLUDE "source/kernel/features/math.asm"
+	%INCLUDE "source/kernel/features/check.asm"
 	%INCLUDE "source/kernel/features/time.asm"
 	%INCLUDE "source/kernel/features/utils.asm"
 	%INCLUDE "source/kernel/features/cli.asm"
 	%INCLUDE "source/kernel/features/misc.asm"
 	%INCLUDE "source/kernel/features/basic.asm"
 
+; PROGRAMS
+	%INCLUDE "source/kernel/programs/ed.asm"
+
 ; DATA/VARIABLES
 	%INCLUDE "source/kernel/data.asm"
 
 
+
+

source/kernel/programs/ed.asm

@@ -0,0 +1,35 @@
+; Planned commands:
+; i insert
+; a append
+; l prints lines
+; w save to disk
+; q quit
+ed:
+	pusha
+	mov si, ed_welcome
+	call os_print_string
+	.main_loop:
+		mov ax, ed_prompt
+		mov bx, 40
+		call keyboard_display_input ; AX = string location, BX = max prompt length
+		mov si, ed_prompt
+		jmp .get_token
+
+	; Types of tokens:
+	; Number: eg 123
+	; Doller (refers to the last line) $
+	; Comma ,
+	; Command: eg i
+	; 123
+	.get_token:
+		xor ax,ax
+		lodsb
+		call check_is_number
+		jmp .exit
+
+	.exit:
+		popa
+		ret
+
+ed_prompt:	times 40 db 0
+ed_welcome: db "This is ED\n", 0