+; sped - the stupidly pointless editor
+; written by pinosaur
+
+%include "fileutils.S"
global main
extern printf
+extern fflush
+extern stdout
; macros
%macro write_str 2
section .data
banner_str db `SPED - the stupidly pointless editor\n`, 0x00
- readfile_str db `reading file %s\n`, 0x00
nofile_str db `no file provided\n`, 0x00
- argcount_str db `there are %d args\n`, 0x00
- wrongfile_str db `unable to open file, error code: %i\n`, 0x00
+ prompt_str db `sped > `, 0x00
+ invalidcommand_str db `invalid command\n`, 0x00
+ charcount_str db `read %i chars\n`, 0x00
-; section .bss
+section .bss
+ buffer resb 4
+ buffer_lines resb 4
+ cur_line resb 4
section .text
main:
+ %define _ARGC 8
+ %define _ARGV 12
+
push ebp
mov ebp, esp
; read command line args
- mov ecx, [ebp+8]
+ mov ecx, [ebp+_ARGC]
cmp ecx, 1
- jg .main_existing
+ jg _main_existing
; display error msg if no file
push nofile_str
call printf
mov eax, 1
- jmp .main_exit
+ jmp _main_exit
-.main_existing:
- mov ebx, DWORD [ebp+12]
- add ebx, 4
+ _main_existing:
+ mov ebx, DWORD [ebp+_ARGV]
+ add ebx, 4 ; first user arg is filename
push DWORD [ebx]
- ; push readfile_str
- ; call printf
-
call readFile
+ mov [buffer], eax
+ mov [buffer_lines], ebx
+ mov DWORD [cur_line], 0x00
+
+ call repl
+
mov eax, 0
- jmp .main_exit
+ jmp _main_exit
+
+ _main_exit:
+ %undef _ARGC
+ %undef _ARGV
-.main_exit:
mov esp, ebp
pop ebp
ret
-; reads file line by line
-; args: filename
-; return:
-; eax - pointer to mem
-; ecx - lines read
-readFile:
- %define _FILE_NAME 8
- %define FILE_HANDLE 4
+; prompt for user
+; no args - reads from globals
+repl:
+
+ %define CMDSTR 4 ; the previous line read from user
push ebp
mov ebp, esp
-
- ; allocate vars
+
sub esp, 4
- mov DWORD [ebp-FILE_HANDLE], 0x00
-
- ; open existing file
- mov eax, 5
- mov ebx, [ebp+_FILE_NAME]
- mov ecx, 0
- mov edx, 0700
- int 0x80
- mov [ebp-FILE_HANDLE], eax
- ; check if file was open successfully
- cmp eax, 0
- jge .readFile_noerror
- push eax
- push wrongfile_str
+ _repl_loop:
+
+ ; print the prompt
+ push prompt_str
call printf
- jmp .readFile_exit
+ push DWORD [stdout]
+ call fflush
-.readFile_noerror:
+ ; read line from stdin
+ push 0
+ call readLine
- jmp .readFile_exit
+ mov DWORD [ebp-CMDSTR], eax
-.readFile_exit:
+ ; commands are single char for now
+ cmp ecx, 1
+ jne _repl_invalid
- ; close file
- mov eax, 6
- mov ebx, [ebp-FILE_HANDLE]
- int 0x80
+ ; parse commands
+ mov eax, DWORD [ebp-CMDSTR]
+ mov eax, [eax]
- %undef _FILE_NAME
- %undef FILE_HANDLE
+ ; q exists program
+ mov eax, DWORD [ebp-CMDSTR]
+ cmp BYTE [eax], 'q'
+ jne _repl_cmd_quit_end
+ jmp _repl_exit
+ _repl_cmd_quit_end:
- mov esp, ebp
- pop ebp
- ret
+ _repl_invalid:
+ push invalidcommand_str
+ call printf
-; reads a line until newline character is reached
-; args: file_handle
-; return: location to buffer
-readLine:
+ _repl_continue:
+ jmp _repl_loop
- %define _FILE_HANDLE 8
-
- push ebp
- mov ebp, esp
-
-.readLine_loop:
-
- ; read a single character
- mov eax, 3
- mov ebx, [ebp+_FILE_HANDLE]
- ; mov ecx,
- mov edx, 1
- int 0x80
+ _repl_exit:
- jmp .readLine_loop
+ %undef CMDSTR
mov esp, ebp
pop ebp
ret
-
+
