240 lines
3.1 KiB
Plaintext
240 lines
3.1 KiB
Plaintext
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display_string:
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lods byte [esi]
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or al,al
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jz string_end
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mov dl,al
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mov ah,2
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int 21h
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jmp display_string
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string_end:
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ret
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alloc:
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push ebx esi edi
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mov cx,ax
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shr eax,16
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mov bx,ax
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mov ax,501h
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int 31h
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jc dpmi_allocation_failed
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mov ax,bx
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shl eax,16
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mov ax,cx
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mov edx,main
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shl edx,4
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sub eax,edx
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mov bx,si
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shl ebx,16
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mov bx,di
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mov ecx,[memory_handles_count]
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inc [memory_handles_count]
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shl ecx,3
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add ecx,memory_handles
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mov [ecx],eax
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mov [ecx+4],ebx
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pop edi esi ebx
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clc
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ret
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dpmi_allocation_failed:
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pop edi esi ebx
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stc
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ret
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free:
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push ebx esi edi
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mov esi,memory_handles
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mov ecx,[memory_handles_count]
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find_memory_handle:
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cmp eax,[esi]
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je memory_handle_found
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add esi,8
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loop find_memory_handle
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pop edi esi
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ret
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memory_handle_found:
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mov ebx,[esi+4]
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dec [memory_handles_count]
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dec ecx
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jz free_memory
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remove_memory_handle:
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mov edx,[esi+8]
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mov edi,[esi+8+4]
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mov [esi],edx
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mov [esi+4],edi
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add esi,8
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loop remove_memory_handle
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free_memory:
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mov esi,ebx
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shr esi,16
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mov di,bx
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mov ax,502h
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int 31h
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pop edi esi ebx
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ret
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open:
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push esi edi ebp
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call adapt_path
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mov ax,716Ch
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mov bx,100000b
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mov dx,1
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xor cx,cx
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xor si,si
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call dos_int
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jnc open_done
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cmp ax,7100h
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je old_open
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stc
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jmp open_done
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old_open:
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mov ax,3D00h
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xor dx,dx
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call dos_int
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open_done:
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mov bx,ax
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pop ebp edi esi
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ret
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adapt_path:
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mov esi,edx
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mov edi,buffer
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copy_path:
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lodsb
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cmp al,'/'
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jne path_char_ok
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mov al,'\'
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path_char_ok:
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stosb
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or al,al
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jnz copy_path
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ret
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dos_int:
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push 0 0 0
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pushw buffer_segment buffer_segment
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stc
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pushfw
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push eax
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push ecx
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push edx
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push ebx
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push 0
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push ebp
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push esi
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push edi
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mov ax,300h
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mov bx,21h
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xor cx,cx
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mov edi,esp
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push es ss
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pop es
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int 31h
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pop es
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mov edi,[esp]
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mov esi,[esp+4]
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mov ebp,[esp+8]
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mov ebx,[esp+10h]
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mov edx,[esp+14h]
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mov ecx,[esp+18h]
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mov ah,[esp+20h]
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add esp,32h
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sahf
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mov eax,[esp-32h+1Ch]
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ret
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create:
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push esi edi ebp
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call adapt_path
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mov ax,716Ch
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mov bx,100001b
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mov dx,10010b
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xor cx,cx
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xor si,si
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xor di,di
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call dos_int
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jnc create_done
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cmp ax,7100h
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je old_create
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stc
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jmp create_done
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old_create:
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mov ah,3Ch
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xor cx,cx
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xor dx,dx
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call dos_int
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create_done:
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mov bx,ax
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pop ebp edi esi
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ret
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write:
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push edx esi edi ebp
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mov ebp,ecx
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mov esi,edx
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write_loop:
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mov ecx,1000h
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sub ebp,1000h
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jnc do_write
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add ebp,1000h
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mov ecx,ebp
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xor ebp,ebp
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do_write:
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push ecx
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mov edi,buffer
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shr ecx,2
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rep movsd
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mov ecx,[esp]
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and ecx,11b
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rep movsb
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pop ecx
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mov ah,40h
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xor dx,dx
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call dos_int
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or ebp,ebp
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jnz write_loop
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pop ebp edi esi edx
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ret
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read:
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push edx esi edi ebp
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mov ebp,ecx
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mov edi,edx
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read_loop:
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mov ecx,1000h
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sub ebp,1000h
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jnc do_read
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add ebp,1000h
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mov ecx,ebp
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xor ebp,ebp
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do_read:
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push ecx
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mov ah,3Fh
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xor dx,dx
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call dos_int
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cmp ax,cx
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jne eof
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mov esi,buffer
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mov ecx,[esp]
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shr ecx,2
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rep movsd
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pop ecx
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and ecx,11b
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rep movsb
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or ebp,ebp
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jnz read_loop
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read_done:
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pop ebp edi esi edx
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ret
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eof:
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pop ecx
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stc
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jmp read_done
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close:
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mov ah,3Eh
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int 21h
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ret
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lseek:
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mov ah,42h
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mov ecx,edx
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shr ecx,16
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int 21h
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pushf
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shl edx,16
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popf
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mov dx,ax
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mov eax,edx
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ret
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