disk.doc

汇编源代码大全

***************************** DISK & FILE *******************************

ASMLIB disk & file subroutines (C) Copyright 1992 - 1993 Douglas Herr
All rights reserved

The MS-DOS file attribute byte tells you whether a file is read-only,
system, a subdirectory, or may provide other information.  File attribute
bits may be combined.  Each bit of the file attribute means:

        0 = normal files
        1 = read-only
        2 = hidden files
        4 = system files
        8 = volume label (only one per disk)
       16 = subdirectories
       32 = archive bit set

   Thus a file with an attribute of 18 is a hidden subdirectory (16 OR 2)



                      ASMLIB buffered file I/O system

    Several ASMLIB subroutines are available for buffered file Input or
    Output.  Files to be managed by the buffered I/O system must be opened
    by FOPEN or FCREATE, and must be closed by FCLOSE.  Buffered file I/O
    will be much faster than unbuffered.  ASMLIB's default buffer size is
    4096 bytes; this can be changed by altering FBUFFER_SIZE in FOPEN.ASM
    and re-assembling.  Up to 20 files can be managed by FOPEN; this can
    be changed by altering NUMBER_OF_FILES in $handle.asm and reassembling.
    All ASMLIB file buffer subroutines assume DS:@data.

    To use the ASMLIB buffered I/O system excess DOS memory must be
    released.  See ENDPROG in SYSTEM.DOC.

    Subroutines: FOPEN        open file & initialize buffer
                 FCREATE      create file & initialize buffer
                 FCLOSE       flush & close output buffer; close file
                 FSEEK        move file pointer & update buffer
                 FGETSTR      read a string from buffer
                 FGETCHR      read a character from buffer
                 FGET         read specified number of bytes from buffer
                 FPUTSTR      write string to buffer
                 FPUTCRLF     write CR+LF to buffer
                 FPUTCHR      write character to buffer
                 FPUT         write specified number of bytes to buffer


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