72 lines
1.3 KiB
NASM
72 lines
1.3 KiB
NASM
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include 'include.asm'
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start:
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len arg1
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cmp ax, 0
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je progret.usage
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mov bx, arg1
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call find_file
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jc progret.fnf
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mov word [file_FS_offset], si
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mov si, file_offset
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jmp view_text.prt
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progret.usage:
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print usage, ln
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jmp progret
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progret.fnf:
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print fnf, ln
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jmp progret
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progret:
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ret
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view_text.prt:
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mov word [xpos], 0
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jmp print_symb
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view_text.prt.continue:
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inc si
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jmp view_text.prt
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view_text.waiting:
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call wait_key
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cmp al, 'q'
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je progret
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jmp view_text.prt
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print_symb:
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mov dl, [xpos]
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mov dh, [ypos]
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cmp dl, 0
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je print_symb.mb_end
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print_symb.continue:
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mov al, [si]
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call print_symbol
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pusha
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cmp [xpos], 24
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je print_symb.mov_ln
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mov al, [xpos]
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inc al
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mov [xpos], al
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print_symb.continue2:
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popa
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printh word [xpos]
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jmp view_text.prt.continue
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print_symb.mov_ln:
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mov al, [ypos]
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inc al
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mov [ypos], al
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mov byte [xpos], 0
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jmp print_symb.continue2
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print_symb.mb_end:
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cmp dh, 25
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je view_text.waiting
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jmp print_symb.continue
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usage db "Usage: viewer.bin <filename>", 0
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fnf db "File not found.", 0
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ln db 0Dh, 0Ah, 0
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file_FS_offset dw 0
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xpos db 0
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ypos db 0
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times 1024-($-$$) db 0
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file_offset:
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times 2000 db "A"
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