mirror of https://github.com/nmlgc/ReC98.git
74 lines
1.1 KiB
NASM
74 lines
1.1 KiB
NASM
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; master library - (pf.lib)
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;
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; Description:
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; ファイルポインタの移動
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;
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; Functions/Procedures:
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; int bseek_(bf_t bf,long offset,int whence);
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;
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; Parameters:
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; bf bファイルハンドル
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; offset 相対量
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; whence 基準位置
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;
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; Returns:
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; 0 成功
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; -1 失敗
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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: 186
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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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; iR
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; 恋塚昭彦
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;
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; Revision History:
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; BSEEK_.ASM 497 94-06-05 20:17
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; 95/ 1/10 Initial: bseek_.asm/master.lib 0.23
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; 95/ 4/20 [M0.23] BUGFIX whence=1にとりあえず対応
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func BSEEK_ ; bseek_() {
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push BP
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mov BP,SP
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;arg bf:word,ofst:dword,whence:word
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bf = (RETSIZE+4)*2
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ofst = (RETSIZE+2)*2
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whence = (RETSIZE+1)*2
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mov ES,[BP+bf] ; BFILE構造体のセグメント
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mov BX,0
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xchg ES:[b_left],BX
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mov AL,[BP+whence]
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mov DX,[BP+ofst]
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mov CX,[BP+ofst+2]
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cmp AL,1
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jne short @@ABSOLUTE_ADR
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sub DX,BX
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sbb CX,0
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@@ABSOLUTE_ADR:
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mov BX,ES:[b_hdl]
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msdos MoveFilePointer
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sbb AX,AX ; AX←carry
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pop BP
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ret (4)*2
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endfunc ; }
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