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https://github.com/QB64-Phoenix-Edition/QB64pe.git
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51667125c9
- No longer constantly (over)writes files in the `internal\temp` folder while typing in the IDE, as the generated C/C++ code is buffered internally now. - Buffers are automatically written out to disk on a `Make` request (F5/F11).
98 lines
3.6 KiB
Plaintext
98 lines
3.6 KiB
Plaintext
'--- This function simulates the open behavior of real files depending
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'--- on the file OPEN mode. That way the file OPEN calls are easily
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'--- replaceable by OpenBuffer%() calls without worry about the internal
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'--- differences of the buffer system compared to real files.
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'--- Respective CLOSE calls can be simply removed as buffers remain
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'--- always accessible until cleared/disposed.
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'-----
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'--- The file names given to this function should be just the same as
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'--- you would use to open a real file, i.e. inclusive full or relative
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'--- path as required.
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'--- Modes names can be short, only the first character is checked.
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'---------------------------------------------------------------------
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FUNCTION OpenBuffer% (sbMode$, sbName$)
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'--- option _explicit requirements ---
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DIM buf%, nul&
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'--- buffer already existing? ---
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FOR buf% = 0 TO UBOUND(SBufN)
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IF SBufN(buf%) = sbName$ THEN EXIT FOR
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NEXT buf%
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'--- simulate file modes ---
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SELECT CASE UCASE$(LEFT$(sbMode$, 1))
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CASE "A" 'append
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IF buf% > UBOUND(SBufN) THEN GOSUB newBuf
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nul& = SeekBuf&(buf%, 0, SBM_BufEnd)
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CASE "B" 'binary
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IF buf% > UBOUND(SBufN) THEN GOSUB newBuf
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nul& = SeekBuf&(buf%, 0, SBM_BufStart)
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CASE "I" 'input
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IF buf% > UBOUND(SBufN) THEN ERROR 53 'buffer not found
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nul& = SeekBuf&(buf%, 0, SBM_BufStart)
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CASE "O" 'output
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IF buf% <= UBOUND(SBufN) THEN DisposeBuf buf%: SBufN(buf%) = ""
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GOSUB newBuf
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CASE ELSE 'random or unknown mode
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buf% = SBE_NoMoreBuffers 'not supported
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END SELECT
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OpenBuffer% = buf%
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EXIT FUNCTION
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'----------
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newBuf:
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buf% = CreateBuf%
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IF buf% > UBOUND(SBufN) THEN REDIM _PRESERVE SBufN(0 TO buf% + 99) AS STRING 'extend by 100 buffers
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SBufN(buf%) = sbName$
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RETURN
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END FUNCTION
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'--- This subroutine will clear the given buffer or ALL buffers, if the
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'--- name argument is empty.
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'--- Clearing a buffer is the equivalent to KILLing a real file.
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'-----
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'--- To designate a single buffer to clear, use the same file name as
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'--- given at the respective OpenBuffer%() call.
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'---------------------------------------------------------------------
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SUB ClearBuffers (sbName$)
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'--- option _explicit requirements ---
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DIM buf%
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'--- clear/dispose buffer(s) ---
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IF sbName$ <> "" THEN
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FOR buf% = 0 TO UBOUND(SBufN)
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IF SBufN(buf%) = sbName$ THEN EXIT FOR 'buffer found
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NEXT buf%
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IF buf% > UBOUND(SBufN) THEN EXIT SUB 'buffer doesn't exist
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DisposeBuf buf%: SBufN(buf%) = ""
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ELSE
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FOR buf% = 0 TO UBOUND(SBufN)
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IF SBufN(buf%) <> "" THEN DisposeBuf buf%: SBufN(buf%) = ""
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NEXT buf%
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END IF
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END SUB
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'--- This subroutine will write the current contents of the given buffer
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'--- or ALL buffers, if the name argument is empty, into the respective
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'--- files on disk (using names as given by the OpenBuffer%() function)
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'--- The change state of the buffer(s) is checked first to avoid needless
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'--- disk writes.
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'-----
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'--- To designate a single buffer to write, use the same file name as
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'--- given at the respective OpenBuffer%() call.
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'---------------------------------------------------------------------
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SUB WriteBuffers (sbName$)
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'--- option _explicit requirements ---
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DIM buf%
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'--- write buffer(s) ---
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IF sbName$ <> "" THEN
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FOR buf% = 0 TO UBOUND(SBufN)
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IF SBufN(buf%) = sbName$ THEN EXIT FOR 'buffer found
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NEXT buf%
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IF buf% > UBOUND(SBufN) THEN EXIT SUB 'buffer doesn't exist
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IF IsBufChanged%(buf%) THEN BufToFile buf%, SBufN(buf%)
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ELSE
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FOR buf% = 0 TO UBOUND(SBufN)
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IF SBufN(buf%) <> "" THEN
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IF IsBufChanged%(buf%) THEN BufToFile buf%, SBufN(buf%)
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END IF
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NEXT buf%
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END IF
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END SUB
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