X-Git-Url: https://git.danieliu.xyz/?p=sped.git;a=blobdiff_plain;f=sped.asm;h=1e200387d1f3d269662b89ce5a589cb7246a8e57;hp=6230c852604e4d959e9a909669573042e4b17b32;hb=0af29f26ae69ba0ba9c5088612f0c537a20c0344;hpb=4c9d6b68e0b493e23969b79e96457b68cfed8895

diff --git a/sped.asm b/sped.asm
index 6230c85..1e20038 100644
--- a/sped.asm
+++ b/sped.asm
@@ -1,4 +1,14 @@
+; sped - the stupidly pointless editor
+; written by pinosaur
 
+%include "fileutils.S"
+
+global main
+extern printf
+extern fflush
+extern stdout
+
+; macros
 %macro write_str 2
     mov eax, 4
     mov ebx, 1
@@ -8,14 +18,112 @@
 %endmacro
 
 section .data
-    msg db "SPED - the stupidly pointless editor", 0x0a
-    len equ $ - msg
+    banner_str db `SPED - the stupidly pointless editor\n`, 0x00
+    nofile_str db `no file provided\n`, 0x00
+    prompt_str db `sped > `, 0x00
+    invalidcommand_str db `invalid command\n`, 0x00
+    charcount_str db `read %i chars\n`, 0x00
+
+section .bss
+    buffer resb 4
+    buffer_lines resb 4
+    cur_line resb 4
 
 section .text
-global _start
-_start:
-    write_str msg, len
+main:
+    %define _ARGC 8
+    %define _ARGV 12
+
+    push ebp
+    mov ebp, esp
 
+    ; read command line args
+    mov ecx, [ebp+_ARGC]
+    cmp ecx, 1
+    jg _main_existing
+    
+    ; display error msg if no file
+    push nofile_str
+    call printf
     mov eax, 1
-    mov ebx, 42
-    int 0x80
+    jmp _main_exit
+
+    _main_existing:
+    mov ebx, DWORD [ebp+_ARGV]
+    add ebx, 4 ; first user arg is filename
+    push DWORD [ebx]
+    call readFile
+
+    mov [buffer], eax
+    mov [buffer_lines], ebx
+    mov DWORD [cur_line], 0x00
+
+    call repl
+
+    mov eax, 0
+    jmp _main_exit
+
+    _main_exit:
+    %undef _ARGC
+    %undef _ARGV
+
+    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
+
+    ; 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:
+
+
+    _repl_invalid:
+    push invalidcommand_str
+    call printf
+
+    _repl_continue:
+    jmp _repl_loop
+    
+    _repl_exit:
+
+    %undef CMDSTR
+
+    mov esp, ebp
+    pop ebp
+    ret
+