mirror of https://github.com/nmlgc/ReC98.git
79 lines
1.2 KiB
NASM
79 lines
1.2 KiB
NASM
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; master library - DOS - file - size
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;
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; Description:
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; ファイルの大きさを得る
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;
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; Function/Procedures:
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; long dos_filesize( int fh ) ;
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;
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; Parameters:
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; fh ファイルハンドル
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;
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; Returns:
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; InvalidHandle (cy=1) ハンドルが無効
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; 0〜 (cy=0) ファイルの大きさ
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;
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; Binding Target:
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; Microsoft-C / Turbo-C / Turbo Pascal
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;
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; Running Target:
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; MS-DOS
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;
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; Requiring Resources:
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; CPU: 8086
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;
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; Notes:
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;
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;
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; Assembly Language Note:
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;
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;
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; Compiler/Assembler:
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; TASM 3.0
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; OPTASM 1.6
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;
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; Author:
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; 恋塚昭彦
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;
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; Revision History:
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; 94/ 2/14 Initial: dosfsize.asm/master.lib 0.22a
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; 95/ 1/21 [M0.23] BUGFIX
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func DOS_FILESIZE ; dos_filesize() {
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mov BX,SP
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@@filehandle = (RETSIZE+0)*2
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mov BX,SS:[BX+@@filehandle]
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mov AX,4201h ; 現在位置を得る
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xor CX,CX
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mov DX,CX
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int 21h
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jc short @@FAULT
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push SI
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push DI
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push AX ; 現在位置をpush
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push DX
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xor DX,DX
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mov AX,4202h ; 末尾へ (CX,DXは既に 0)
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int 21h
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mov SI,AX ; 末尾位置を DI,SIに保存
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mov DI,DX
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pop CX
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pop DX
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mov AX,4200h ; 元の位置へ戻る
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int 21h
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mov AX,SI
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mov DX,DI
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pop DI
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pop SI
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ret 2
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@@FAULT:
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neg AX ; InvalidHandle
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sbb DX,DX ; 必ず-1, cy=1
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ret 2
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endfunc ; }
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