X-Git-Url: https://git.danieliu.xyz/?p=sped.git;a=blobdiff_plain;f=sped.asm;h=e0920a1712b6c5af80784a4995d2eb9073796ef2;hp=d7dcb8de8a7a55ed4bddc4917be6192cc886f130;hb=HEAD;hpb=aab6303fb9c43a2d727774c25b3c50a4b1fcae8d

diff --git a/sped.asm b/sped.asm
index d7dcb8d..e0920a1 100644
--- a/sped.asm
+++ b/sped.asm
@@ -1,48 +1,35 @@
 ; sped - the stupidly pointless editor
 ; written by pinosaur
+; sped.asm: main file
 
-%include "fileutils.S"
+%include "macros.S"
 
 extern printf
-extern fflush
-extern stdout
-extern free
 
-global main
+extern readFile
+extern repl
 
-; macros
-%macro write_str 2
-    mov eax, 4
-    mov ebx, 1
-    mov ecx, %1
-    mov edx, %2
-    int 0x80
-%endmacro
+global main
 
 section .data
     banner_str db `SPED - the stupidly pointless editor\n`, 0x00
-    nofile_str db `no file provided\n`, 0x00
-    readlines_str db `opened file with %i lines\n`, 0x00
-    prompt_str db `sped > `, 0x00
-    invalidcmd_str db `invalid command\n`, 0x00
-    invalidaddr_str db `invalid address\n`, 0x00
-    charcount_str db `read %i chars\n`, 0x00
-    currentline_str db `current line: %i\n`, 0x00
-    echo_str db `%s`, 0x00 ; print strings without format exploit
-
-section .bss
-    buffer resb 4
-    buffer_lines resb 4
-    cur_line resb 4
+    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
@@ -57,17 +44,22 @@ main:
     _main_existing:
     mov ebx, DWORD [ebp+_ARGV]
     add ebx, 4 ; first user arg is filename
-    push DWORD [ebx]
+    mov ebx, [ebx]
+    mov [ebp-BUFFER_FILENAME], ebx
+
+    push DWORD [ebp-BUFFER_FILENAME]
     call readFile
 
-    mov [buffer], eax
-    mov [buffer_lines], ecx
-    mov DWORD [cur_line], 0x00
+    mov [ebp-BUFFER], eax
+    mov [ebp-BUFFER_LINES], ecx
 
-    push DWORD [buffer_lines]
+    push DWORD [ebp-BUFFER_LINES]
     push readlines_str
     call printf
 
+    push DWORD [ebp-BUFFER]
+    push DWORD [ebp-BUFFER_LINES]
+    push DWORD [ebp-BUFFER_FILENAME]
     call repl
 
     mov eax, 0
@@ -77,186 +69,13 @@ main:
 
     ; free string array
 
-
     %undef _ARGC
     %undef _ARGV
+    %undef BUFFER
+    %undef BUFFER_LINES
+    %undef BUFFER_FILENAME
 
     mov esp, ebp
     pop ebp
     ret
 
-; prompt for user
-; no args - reads from globals
-repl:
-
-    %define CMDSTR 4 ; the previous line read from user
-
-    push ebp
-    mov ebp, esp
-
-    sub esp, 4
-
-    _repl_loop:
-    
-    ; print the prompt
-    push prompt_str
-    call printf
-    push DWORD [stdout]
-    call fflush
-
-    ; read line from stdin
-    push 0
-    call readLine
-
-    mov DWORD [ebp-CMDSTR], eax
-
-    ; commands are single char for now
-    cmp ecx, 1 
-    jne _repl_invalid_cmd
-
-    ; parse commands
-    mov eax, DWORD [ebp-CMDSTR]
-    mov eax, [eax]
-
-    ; q exists program =-=-=-=-=-=-=-=-=-=-=-=-=
-    mov eax, DWORD [ebp-CMDSTR]
-    cmp BYTE [eax], 'q'
-    jne _repl_cmd_quit_end
-    jmp _repl_exit
-    _repl_cmd_quit_end:
-
-    ; p prints current line =-=-=-=-=-=-=-=-=-=-=
-    mov eax, DWORD [ebp-CMDSTR]
-    cmp BYTE [eax], 'p'
-    jne _repl_cmd_print_end
-
-    mov eax, DWORD [cur_line]
-    mov ecx, 4
-    mul ecx
-    add eax, [buffer]
-    push DWORD [eax]
-    push echo_str
-    call printf
-    jmp _repl_continue
-    _repl_cmd_print_end:
-
-    ; n prints the current line number =-=-=-=-=-=-=-=
-    mov eax, DWORD [ebp-CMDSTR]
-    cmp BYTE [eax], 'n'
-    jne _repl_cmd_number_end
-
-    push DWORD [cur_line]
-    push currentline_str
-    call printf
-
-    jmp _repl_continue
-    _repl_cmd_number_end:
-
-    ; - goes to prev line =-=-=-=-=-=-=-=-=-=-=-=-=
-    mov eax, DWORD [ebp-CMDSTR]
-    cmp BYTE [eax], '-'
-    jne _repl_cmd_decline_end
-
-    ; make sure we are within bounds
-    mov eax, DWORD [cur_line] 
-    sub eax, 1
-    cmp eax, 0
-    jl _repl_invalid_addr
-    
-    sub DWORD [cur_line], 1
-
-    jmp _repl_continue
-    _repl_cmd_decline_end:
-
-    ; + goes to next line =-=-=-=-=-=-=-=-=-=-=-=-=
-    mov eax, DWORD [ebp-CMDSTR]
-    cmp BYTE [eax], '+'
-    jne _repl_cmd_incline_end
-
-    ; make sure we are within bounds 
-    mov eax, DWORD [cur_line] 
-    add eax, 1
-    cmp eax, [buffer_lines]
-    jge _repl_invalid_addr
-    
-    add DWORD [cur_line], 1
-
-    jmp _repl_continue
-    _repl_cmd_incline_end:
-
-    ; g goes to first line =-=-=-=-=-=-=-=-=-=-=-=-=
-    mov eax, DWORD [ebp-CMDSTR]
-    cmp BYTE [eax], 'g'
-    jne _repl_cmd_jumptop_end
-
-    mov DWORD [cur_line], 0x00
-
-    jmp _repl_continue
-    _repl_cmd_jumptop_end:
-
-    ; G goes to last line =-=-=-=-=-=-=-=-=-=-=-=-=
-    mov eax, DWORD [ebp-CMDSTR]
-    cmp BYTE [eax], 'G'
-    jne _repl_cmd_jumpbot_end
-
-    mov eax, DWORD [buffer_lines]
-    sub eax, 1
-    mov DWORD [cur_line], eax
-
-    jmp _repl_continue
-    _repl_cmd_jumpbot_end:
-
-    ; c changes the current line =-=-=-=-=-=-=-=-=-=
-    mov eax, DWORD [ebp-CMDSTR]
-    cmp BYTE [eax], 'c'
-    jne _repl_cmd_change_end
-
-    ; read a new line to use
-    push 0
-    call readLine
-
-    mov esi, eax
-
-    ; free old string
-    mov eax, [cur_line]
-    mov ecx, 4
-    mul ecx
-    add eax, [buffer]
-    push DWORD [eax]
-    call free
-
-    ; insert new string
-    mov eax, [cur_line]
-    mov ecx, 4
-    mul ecx
-    add eax, DWORD [buffer]
-    mov [eax], esi
-
-    jmp _repl_continue
-    _repl_cmd_change_end:
-
-
-    jmp _repl_invalid_cmd
-
-    ; some error messages
-    _repl_invalid_cmd:
-    push invalidcmd_str
-    call printf
-    jmp _repl_continue
-
-    _repl_invalid_addr:
-    push invalidaddr_str
-    call printf
-    jmp _repl_continue
-
-    _repl_continue:
-    jmp _repl_loop
-    
-    _repl_exit:
-
-    %undef CMDSTR
-
-    mov esp, ebp
-    pop ebp
-    ret
-