256 lines
5.7 KiB
NASM
256 lines
5.7 KiB
NASM
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include 'proc32.inc'
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DLL_ENTRY equ 1
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DLL_EXIT equ -1
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REQ_DLL_VER equ 4
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use32
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db 'MENUET01'
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dd 1
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dd start
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dd i_end
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dd mem
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dd mem
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dd 0
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dd 0
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start:
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stdcall load_dll_and_import, dllname, imports
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test eax, eax
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jz exit
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; check version
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cmp word [dll_ver], REQ_DLL_VER
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jb exit
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cmp word [dll_ver+2], REQ_DLL_VER
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ja exit
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push DLL_ENTRY
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call [dll_start]
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; yes! Now do some work (gets2() demo in this case).
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push caption
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push 25
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push 80
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push 25
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push 80
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call [con_init]
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; C-equivalent of the following code:
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; for (;;)
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; {
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; con_write_asciiz("Enter string (empty for exit): ");
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; if (!con_gets2(mycallback,s,256)) break;
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; if (s[0] == '\n') break;
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; con_write_asciiz("You entered: ");
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; con_write_asciiz(s);
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; }
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mainloop:
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push str1
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call [con_write_asciiz]
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push 256
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push s
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push mycallback
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call [con_gets2]
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test eax, eax
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jz done
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cmp [s], 10
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jz done
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push str2
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call [con_write_asciiz]
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push s
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call [con_write_asciiz]
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jmp mainloop
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done:
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push 1
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call [con_exit]
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exit:
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or eax, -1
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int 0x40
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proc mycallback stdcall, keycode:dword, pstr:dword, pn:dword, ppos:dword
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mov eax, [keycode]
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cmp al, 0x0F
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jz .tab
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cmp al, 0x3B
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jz .f1
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cmp al, 0x48
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jz .up
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cmp al, 0x50
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jz .down
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xor eax, eax
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ret
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.tab:
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; Tab pressed - insert "[autocomplete]" to current position
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push esi edi
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mov eax, [ppos]
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mov eax, [eax]
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mov ecx, [pn]
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mov ecx, [ecx]
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mov esi, [pstr]
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mov esi, [esi]
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add ecx, esi
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add esi, eax
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mov edx, esi
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@@:
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lodsb
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test al, al
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jnz @b
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lea edi, [esi+str3.len]
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cmp edi, ecx
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jbe @f
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mov edi, ecx
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lea esi, [edi-str3.len]
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@@:
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cmp esi, edx
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jbe @f
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dec esi
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dec edi
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mov al, [esi]
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mov [edi], al
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jmp @b
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@@:
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cmp edi, ecx
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jb @f
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dec edi
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@@:
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mov ecx, edi
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sub ecx, edx
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mov edi, edx
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mov esi, str3
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rep movsb
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mov eax, [pstr]
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sub edi, [eax]
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mov eax, [ppos]
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mov [eax], edi
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pop edi esi
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xor eax, eax
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inc eax
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ret
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.f1:
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; F1 pressed - say message
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push str4
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call [con_write_asciiz]
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push str1
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call [con_write_asciiz]
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push 2
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pop eax
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ret
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.up:
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push esi
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mov esi, str5
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mov ecx, str5.len
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jmp @f
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.down:
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push esi
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mov esi, str6
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mov ecx, str6.len
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@@:
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push edi
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mov edi, [pstr]
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mov edi, [edi]
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mov eax, [ppos]
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mov [eax], ecx
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rep movsb
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xor eax, eax
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stosb
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pop edi esi
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inc eax
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ret
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endp
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proc load_dll_and_import stdcall, _dllname:dword, _imports:dword
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pushad
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; load DLL
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push 68
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pop eax
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push 19
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pop ebx
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mov ecx, [_dllname]
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int 0x40
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test eax, eax
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jz import_fail
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; initialize import
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mov edi, eax
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mov esi, [_imports]
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import_loop:
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lodsd
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test eax, eax
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jz import_done
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mov edx, edi
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import_find:
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mov ebx, [edx]
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test ebx, ebx
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jz import_not_found
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push eax
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@@:
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mov cl, [eax]
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cmp cl, [ebx]
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jnz import_find_next
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test cl, cl
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jz import_found
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inc eax
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inc ebx
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jmp @b
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import_find_next:
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pop eax
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add edx, 8
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jmp import_find
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import_found:
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pop eax
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mov eax, [edx+4]
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mov [esi-4], eax
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jmp import_loop
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import_not_found:
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import_fail:
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popad
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xor eax, eax
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ret
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import_done:
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popad
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xor eax, eax
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inc eax
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ret
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endp
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align 4
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imports:
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dll_start dd szStart
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dll_ver dd szVersion
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con_init dd szcon_init
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con_write_asciiz dd szcon_write_asciiz
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con_exit dd szcon_exit
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con_gets2 dd szcon_gets2
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dd 0
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szStart db 'START',0
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szVersion db 'version',0
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szcon_init db 'con_init',0
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szcon_write_asciiz db 'con_write_asciiz',0
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szcon_exit db 'con_exit',0
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szcon_gets2 db 'con_gets2',0
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dllname db '/sys/lib/console.obj',0
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caption db 'Console test - gets2()',0
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str1 db 'Enter string (empty for exit): ',0
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str2 db 'You entered: ',0
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str3 db '[autocomplete]'
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str3.len = $ - str3
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str4 db 13,10,'Help? What help do you need?',13,10,0
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str5 db 'previous line in the history'
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str5.len = $ - str5
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str6 db 'next line in the history'
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str6.len = $ - str6
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i_end:
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s rb 256
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align 4
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rb 2048 ; stack
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mem:
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