174 lines
4.7 KiB
NASM
174 lines
4.7 KiB
NASM
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;*****************************************************************************
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; CROPFLAT - set limits of screen - for Kolibri OS
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; Copyright (c) 2012, Marat Zakiyanov aka Mario79, aka Mario
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; All rights reserved.
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;
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; Redistribution and use in source and binary forms, with or without
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; modification, are permitted provided that the following conditions are met:
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; * Redistributions of source code must retain the above copyright
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; notice, this list of conditions and the following disclaimer.
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; * Redistributions in binary form must reproduce the above copyright
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; notice, this list of conditions and the following disclaimer in the
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; documentation and/or other materials provided with the distribution.
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; * Neither the name of the <organization> nor the
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; names of its contributors may be used to endorse or promote products
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; derived from this software without specific prior written permission.
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;
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; THIS SOFTWARE IS PROVIDED BY Marat Zakiyanov ''AS IS'' AND ANY
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; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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; DISCLAIMED. IN NO EVENT SHALL <copyright holder> BE LIABLE FOR ANY
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; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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; (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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;*****************************************************************************
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;
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; Example run with parameters:
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; CROPFLAT XS800 YS480
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;
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;------------------------------------------------------------------------------
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use32
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org 0x0
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db 'MENUET01'
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dd 0x01
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dd START
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dd IM_END
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dd I_END
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dd stack_top
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dd boot_param
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dd 0x0
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include '../../macros.inc'
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;include 'debug.inc'
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;------------------------------------------------------------------------------
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START:
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mcall 14
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mov ebx,eax
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shr eax,16
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inc eax
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mov [x_size],eax
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; dps "CROPFLAT current X size: "
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; dpd eax
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; newline
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and ebx,0xffff
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inc ebx
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mov [y_size],ebx
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; dps "CROPFLAT current Y size: "
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; dpd ebx
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; newline
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;------------------------------------------------------------------------------
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mov bx,word 'XS'
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call find_value
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test eax,eax
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jnz .y
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call convert_ASCII_to_BIN
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test ebx,ebx
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jz @f
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mov [x_size],ebx
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;--------------------------------------
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@@:
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; dps "CROPFLAT new X size: "
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; dpd ebx
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; newline
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;------------------------------------------------------------------------------
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.y:
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mov bx,word 'YS'
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call find_value
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test eax,eax
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jnz .set
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call convert_ASCII_to_BIN
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test ebx,ebx
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jz @f
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mov [y_size],ebx
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;--------------------------------------
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@@:
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; dps "CROPFLAT new Y size: "
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; dpd ebx
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; newline
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;------------------------------------------------------------------------------
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.set:
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mcall 18,24,[x_size],[y_size]
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;--------------------------------------
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.exit:
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mcall -1
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;------------------------------------------------------------------------------
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find_value:
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; in:
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; bx - word
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; out:
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; eax - 0 for valid value, -1 for invalid value
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; esi - ASCII value
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mov esi,boot_param
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mov ecx,254
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cld
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;--------------------------------------
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.loop:
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lodsw
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cmp ax,bx
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je @f
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dec esi
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loop .loop
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mov eax,-1
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ret
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;--------------------------------------
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@@:
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xor eax,eax
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ret
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;------------------------------------------------------------------------------
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convert_ASCII_to_BIN:
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; in:
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; esi - ASCII value
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; out:
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; ebx - BIN value
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mov ecx,4
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xor ebx,ebx
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cld
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;--------------------------------------
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.loop:
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lodsb
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cmp al,0x30 ; 0
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jb @f
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cmp al,0x39 ; 9
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ja @f
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sub al,0x30
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; multiply by 10
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lea ebx,[ebx+ebx*4] ; multiply by 5
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shl ebx,1 ; multiply by 2
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movzx eax,al
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add ebx,eax
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loop .loop
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;--------------------------------------
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@@:
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ret
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;------------------------------------------------------------------------------
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IM_END:
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;------------------------------------------------------------------------------
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align 4
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x_size rd 1
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y_size rd 1
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;------------------------------------------------------------------------------
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align 4
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boot_param:
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rb 256+1 ; +1 for reserve
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;------------------------------------------------------------------------------
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align 4
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rb 512
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stack_top:
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;------------------------------------------------------------------------------
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I_END:
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;------------------------------------------------------------------------------
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