; sped - the stupidly pointless editor
; written by pinosaur
+; sped.asm: main file
+
+%include "macros.S"
-global main
extern printf
-; macros
-%macro write_str 2
- mov eax, 4
- mov ebx, 1
- mov ecx, %1
- mov edx, %2
- int 0x80
-%endmacro
+extern readFile
+extern repl
+
+global main
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
- char_str db `read this char: %i\n`, 0x00
- printfint_str db `int: %i\n`, 0x00
-
-section .bss
- read_buf resb 64
+ nofile_str db `no file provided.\n`, 0x00
+ readlines_str db `opened file with %i lines.\n`, 0x00
section .text
main:
%define _ARGC 8
%define _ARGV 12
+ %define BUFFER 4
+ %define BUFFER_LINES 8
+ %define BUFFER_FILENAME 12
+
push ebp
mov ebp, esp
+ sub esp, 12
+
; read command line args
mov ecx, [ebp+_ARGC]
cmp ecx, 1
_main_existing:
mov ebx, DWORD [ebp+_ARGV]
- add ebx, 4
- push DWORD [ebx]
- ; push readfile_str
- ; call printf
+ add ebx, 4 ; first user arg is filename
+ mov ebx, [ebx]
+ mov [ebp-BUFFER_FILENAME], ebx
+ push DWORD [ebp-BUFFER_FILENAME]
call readFile
- mov eax, 0
- jmp _main_exit
+ mov [ebp-BUFFER], eax
+ mov [ebp-BUFFER_LINES], ecx
- _main_exit:
- %undef _ARGC
- %undef _ARGV
-
- 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
-
- 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, 0777
- int 0x80
- mov [ebp-FILE_HANDLE], eax
-
- ; check if file was open successfully
- cmp eax, 0
- jge _readFile_noerror
- push eax
- push wrongfile_str
+ push DWORD [ebp-BUFFER_LINES]
+ push readlines_str
call printf
- jmp _readFile_exit
-
- _readFile_noerror:
- push DWORD [ebp-FILE_HANDLE]
- call readLine
-
- jmp _readFile_exit
-
- _readFile_exit:
- ; close file
- mov eax, 6
- mov ebx, [ebp-FILE_HANDLE]
- int 0x80
-
- %undef _FILE_NAME
- %undef FILE_HANDLE
-
- mov esp, ebp
- pop ebp
- ret
-
-; reads a line until newline character is reached
-; args: file_handle
-; return:
-; location to buffer
-; contains eof
-readLine:
- %define _FILE_HANDLE 8
- %define CHAR_PTR 4
+ push DWORD [ebp-BUFFER]
+ push DWORD [ebp-BUFFER_LINES]
+ push DWORD [ebp-BUFFER_FILENAME]
+ call repl
- push ebp
- mov ebp, esp
-
- sub esp, 4
- mov DWORD [ebp-CHAR_PTR], 0x00
-
- _readLine_loop:
- ; if buffer is full
- cmp BYTE [ebp-CHAR_PTR], 64
- jne _readLine_notfull
- jmp _readLine_exit
-
- _readLine_notfull:
- ; read a single character
- mov eax, 3
- mov ebx, [ebp+_FILE_HANDLE]
- mov ecx, read_buf
- add ecx, [ebp-CHAR_PTR]
- mov edx, 1
- int 0x80
-
- mov eax, 4
- mov ebx, 1
- mov ecx, read_buf
- add ecx, [ebp-CHAR_PTR]
- mov edx, 1
- int 0x80
-
- ; check for newline
- mov eax, read_buf
- add eax, [ebp-CHAR_PTR]
- cmp DWORD [eax], 0x0a
- je _readLine_exit
-
- ; check for eof
- mov eax, read_buf
- add eax, [ebp-CHAR_PTR]
- cmp DWORD [eax], 0x05
- je _readLine_exit
-
- add DWORD [ebp-CHAR_PTR], 1
+ mov eax, 0
+ jmp _main_exit
- jmp _readLine_loop
+ _main_exit:
- _readLine_exit:
+ ; free string array
- %undef _FILE_HANDLE
- %undef CHAR_PTR
+ %undef _ARGC
+ %undef _ARGV
+ %undef BUFFER
+ %undef BUFFER_LINES
+ %undef BUFFER_FILENAME
mov esp, ebp
pop ebp
