mirror of https://github.com/nmlgc/ReC98.git
83 lines
1.2 KiB
NASM
83 lines
1.2 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相対移動
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;
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; Functions/Procedures:
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; int bseek(bf_t bf, long offset);
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;
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; Parameters:
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; bf bファイルポインタ
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; offset 相対移動量
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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 694 94-06-01 8:40
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; 95/ 1/10 Initial: bseek.asm/master.lib 0.23
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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
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bf = (RETSIZE+3)*2
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ofst = (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 AX,ES:[b_left]
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mov DX,[BP+ofst]
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mov CX,[BP+ofst+2]
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or CX,CX
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jnz short @@_outbuf
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cmp DX,AX
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ja short @@_outbuf
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@@_inbuf:
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sub ES:[b_left],DX
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add ES:[b_pos],DX
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clr AX
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pop BP
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ret (3)*2
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EVEN
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@@_outbuf:
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; ファイルポインタを移動(カレントから)
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mov BX,ES:[b_hdl]
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sub DX,AX
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sbb CX,0
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msdos MoveFilePointer,1
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sbb AX,AX ; mov AX,carry
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mov ES:[b_left],AX
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pop BP
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ret (3)*2
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endfunc ; }
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