X-Git-Url: https://git.danieliu.xyz/?a=blobdiff_plain;f=repl.asm;h=750e430becf71190c68fb18fb4c37f725951b3dc;hb=HEAD;hp=3c7f429a9573deace3750cbfe4961eb891e69362;hpb=89732d399de9007aaf2894b0c637e8cfb9ed47ac;p=sped.git

diff --git a/repl.asm b/repl.asm
index 3c7f429..750e430 100644
--- a/repl.asm
+++ b/repl.asm
@@ -1,18 +1,24 @@
-
-%include "fileutils.S"
+; sped - the stupidly pointless editor
+; written by pinosaur
+; repl.asm: user interactions
 
 extern printf
 extern fflush
 extern stdout
 extern free
 
+extern readLine
+extern writeFile
+extern shiftLeft
+extern shiftRight
+
 global repl
 
 section .data
     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
+    invalidcmd_str db `invalid command.\n`, 0x00
+    invalidaddr_str db `invalid address.\n`, 0x00
+    oneline_str db `cannot delete line, as there is only one line.\n`, 0x00
     currentline_str db `current line: %i\n`, 0x00
     echo_str db `%s`, 0x00 ; print strings without format exploit
 
@@ -190,12 +196,94 @@ repl:
     mov eax, DWORD [ebp-CMDSTR]
     cmp BYTE [eax], 'd'
     jne _repl_cmd_delete_end
-
     
+    ; check to make sure we don't have only one line
+    cmp DWORD [buffer_lines], 1
+    jle _repl_oneline
+
+    ; delete the line
+    push DWORD [buffer]
+    push DWORD [buffer_lines]
+    push DWORD [cur_line]
+    call shiftLeft
+    mov [buffer], eax
+
+    sub DWORD [buffer_lines], 1
+
+    ; if it's the last line, move one down
+    mov eax, DWORD [buffer_lines]
+    cmp DWORD [cur_line], eax
+    jl _repl_continue
+    sub DWORD [cur_line], 1
 
     jmp _repl_continue
     _repl_cmd_delete_end:
 
+    ; o appends text after line =-=-=-=-=-=-=-=-=
+    mov eax, DWORD [ebp-CMDSTR]
+    cmp BYTE [eax], 'o'
+    jne _repl_cmd_appenddown_end
+
+    ; make room first
+    push DWORD [buffer]
+    push DWORD [buffer_lines]
+    mov eax, DWORD [cur_line]
+    add eax, 1
+    push eax
+    call shiftRight
+    mov [buffer], eax
+
+    ; input text
+    push 0
+    call readLine
+    mov esi, eax
+
+    ; insert new string
+    mov eax, [cur_line]
+    add eax, 1
+    mov ecx, 4
+    mul ecx
+    add eax, DWORD [buffer]
+    mov [eax], esi
+
+    add DWORD [buffer_lines], 1
+
+    jmp _repl_continue
+    _repl_cmd_appenddown_end:
+
+    ; O oppens text before line =-=-=-=-=-=-=-=
+    mov eax, DWORD [ebp-CMDSTR]
+    cmp BYTE [eax], 'O'
+    jne _repl_cmd_appendup_end
+
+    ; make room first
+    push DWORD [buffer]
+    push DWORD [buffer_lines]
+    push DWORD [cur_line]
+    call shiftRight
+    mov [buffer], eax
+
+    ; input text
+    push 0
+    call readLine
+    mov esi, eax
+
+    ; insert new string
+    mov eax, [cur_line]
+    mov ecx, 4
+    mul ecx
+    add eax, DWORD [buffer]
+    mov [eax], esi
+    
+    ; also move cursor down one
+    add DWORD [cur_line], 1
+
+    add DWORD [buffer_lines], 1
+
+    jmp _repl_continue
+    _repl_cmd_appendup_end:
+
+
     ; w writes file =-=-=-=-=-=-=-=-=-=-=-=-=
     mov eax, DWORD [ebp-CMDSTR]
     cmp BYTE [eax], 'w'
@@ -224,6 +312,11 @@ repl:
     call printf
     jmp _repl_continue
 
+    _repl_oneline:
+    push oneline_str
+    call printf
+    jmp _repl_continue
+
     _repl_continue:
     jmp _repl_loop