forked from KolibriOS/kolibrios
166 lines
4.7 KiB
PHP
166 lines
4.7 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2013-2022. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision$
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;------------------------------------------------------------------------------
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align 4
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sys_clipboard:
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xor eax, eax
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dec eax
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; check availability of main list
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cmp [clipboard_main_list], eax
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je .exit_1 ; main list area not found
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test ebx, ebx ; 0 - Get the number of slots in the clipboard
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jnz .1
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; get the number of slots
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mov eax, [clipboard_slots]
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jmp .exit_1
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;------------------------------------------------------------------------------
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align 4
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.1:
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dec ebx ; 1 - Read the data from the clipboard
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jnz .2
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; verify the existence of slot
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cmp ecx, [clipboard_slots]
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jae .exit_2
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; get a pointer to the data of slot
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shl ecx, 2
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add ecx, [clipboard_main_list]
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mov esi, [ecx]
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mov ecx, [esi]
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; allocate memory for application for copy the data of slots
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push ecx
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stdcall user_alloc, ecx
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pop ecx
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; copying data of slots
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mov edi, eax
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cld
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rep movsb
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jmp .exit_1
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;------------------------------------------------------------------------------
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align 4
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.2:
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dec ebx ; 2 - Write the data to the clipboard
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jnz .3
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; check pointer on kernel address
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stdcall is_region_userspace, edx, ecx
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jz @f
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mov eax, -1
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jmp .exit_1
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@@:
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; check the lock
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mov ebx, clipboard_write_lock
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xor eax, eax
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cmp [ebx], eax
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jne .exit_2
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; lock last slot
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inc eax
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mov [ebx], eax
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; check the overflow pointer of slots
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cmp [clipboard_slots], 1024
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jae .exit_3
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; get memory for new slot
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push ebx ecx edx
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stdcall kernel_alloc, ecx
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pop edx ecx ebx
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test eax, eax
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jz .exit_3
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; create a new slot
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mov edi, eax
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mov eax, [clipboard_slots]
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shl eax, 2
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add eax, [clipboard_main_list]
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mov [eax], edi
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; copy the data into the slot
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mov esi, edx
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mov eax, ecx
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cld
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stosd ; store size of slot
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sub ecx, 4
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add esi, 4
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rep movsb ; store slot data
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; increase the counter of slots
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inc [clipboard_slots]
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; unlock last slot
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xor eax, eax
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mov [ebx], eax
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jmp .exit_1
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;------------------------------------------------------------------------------
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align 4
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.3:
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dec ebx ; 3 - Delete the last slot in the clipboard
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jnz .4
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; check the availability of slots
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mov eax, [clipboard_slots]
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test eax, eax
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jz .exit_2
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; check the lock
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mov ebx, clipboard_write_lock
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xor eax, eax
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cmp [ebx], eax
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jne .exit_2
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; lock last slot
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inc eax
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mov [ebx], eax
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; decrease the counter of slots
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mov eax, clipboard_slots
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dec dword [eax]
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; free of kernel memory allocated for the slot
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mov eax, [eax]
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shl eax, 2
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add eax, [clipboard_main_list]
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mov eax, [eax]
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push ebx
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stdcall kernel_free, eax
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pop ebx
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; unlock last slot
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xor eax, eax
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mov [ebx], eax
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jmp .exit_1
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;------------------------------------------------------------------------------
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align 4
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.4:
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dec ebx ; 4 - Emergency discharge of clipboard
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jnz .exit
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; check the lock
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mov ebx, clipboard_write_lock
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xor eax, eax
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cmp [ebx], eax
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je .exit_2
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; there should be a procedure for checking the integrity of the slots
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; and I will do so in the future
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; unlock last slot
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mov [ebx], eax
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jmp .exit
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;------------------------------------------------------------------------------
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align 4
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.exit_3:
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; unlock last slot
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xor eax, eax
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mov [ebx], eax
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.exit_2:
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xor eax, eax
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inc eax ; error
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.exit_1:
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mov [esp + SYSCALL_STACK.eax], eax
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.exit:
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ret
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;------------------------------------------------------------------------------
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uglobal
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align 4
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clipboard_slots dd ?
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clipboard_main_list dd ?
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clipboard_write_lock dd ?
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endg
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;------------------------------------------------------------------------------
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