X-Git-Url: https://git.danieliu.xyz/?p=sped.git;a=blobdiff_plain;f=sped.asm;h=1e200387d1f3d269662b89ce5a589cb7246a8e57;hp=a76e7de3e1477462a30d83093a8f33d011c6923a;hb=0af29f26ae69ba0ba9c5088612f0c537a20c0344;hpb=a7e38d5436df06ef83114adbcd3ee8c89d609b16

diff --git a/sped.asm b/sped.asm
index a76e7de..1e20038 100644
--- a/sped.asm
+++ b/sped.asm
@@ -1,6 +1,12 @@
+; sped - the stupidly pointless editor
+; written by pinosaur
+
+%include "fileutils.S"
 
 global main
 extern printf
+extern fflush
+extern stdout
 
 ; macros
 %macro write_str 2
@@ -13,119 +19,111 @@ extern printf
 
 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
-
+