Add Type and More, and the file stream they are built on
Two applications that read a file too big for Data Memory: Type prints one, More pages it. Both sit on fileStream.asm, which wraps osFileInfo and osFileBlock into open-and-next so an application walks a file's blocks without repeating the service calls. The disk fixture is deliberately awkward: readable.txt crosses several blocks and carries no zero byte to be mistaken for an end marker, and empty.txt says that zero blocks is a valid file rather than an error. These three files were written by ChatGPT, as their headers record. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01E2JrLzFvuFX9fgi1LDRjrW
This commit is contained in:
Anachronaut
co-authored by
Claude Opus 5
Claude Opus 5
parent
4fd8bf7b3f
commit
dbe58db660
@@ -0,0 +1,151 @@
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; Read a text file one screen at a time.
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;
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; Twenty two lines are shown before a prompt. Space advances another screen, Return one
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; line, and q gives the machine back to CosmOS. This is forward-only on purpose: the file
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; stream holds one block and never asks the whole document to fit in memory.
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;
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; Written by ChatGPT for Anachronaut's SplitBit
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#Include services.asm
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#Program
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#Base 0x2000
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start:
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SETD.0 Name
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INIB 0d29
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SWI osArgument
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SETD.0 Name
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LDA.0
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BRA noName
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CALL fileStreamOpen
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BNQ openFailed
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CALL fullPage
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nextBlock:
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CALL fileStreamNext
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BNQ readFailed
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PSHD.3
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POPB
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POPA
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SETD.2 Remaining
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STA.2
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INCD.2
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STB.2
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OR
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BRQ finished
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SETD.1 FileStreamBlock
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SETD.2 Remaining
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printLoop:
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LDA.1
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OUTA 0x00
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INIB 0x0A
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XOR
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BNQ bytePrinted
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SETD.3 LinesLeft
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LDA.3
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DECA
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STA.3
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BNA bytePrinted
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CALL pause
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BNQ finished
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bytePrinted:
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INCD.1
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CALL fileStreamTakeRemaining
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BRQ nextBlock
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BRI printLoop
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; Ask for one key without asking for Return. The console is put back immediately,
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; including on q and end of redirected input.
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pause:
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SETD.0 MorePrompt
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SWI osPrintString
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INIA 0x01
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OUTA 0x02
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INA 0x00
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PSHA ; Keep the key while A is used to restore line mode.
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RSTA
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OUTA 0x02
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POPA
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SETD.0 ClearPrompt
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SWI osPrintString
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INIB 0x71 ; q
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XOR
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BRQ pauseQuit
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INIB 0xFF ; end of redirected input
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XOR
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BRQ pauseQuit
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INIB 0x0A ; Return: one more line.
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XOR
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BRQ oneLine
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INIB 0x20 ; Space: one more screen.
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XOR
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BNQ pause ; Ignore every other key.
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CALL fullPage
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RSTA
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RSTB
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OR
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RET
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oneLine:
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SETD.3 LinesLeft
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INIA 0x01
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STA.3
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RSTA
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RSTB
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OR
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RET
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pauseQuit:
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RSTA
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INIB 0x01
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OR
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RET
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fullPage:
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SETD.3 LinesLeft
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INIA 0d22
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STA.3
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RET
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noName:
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SETD.0 Usage
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SWI osPrintString
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SWI osExit
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openFailed:
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SETD.0 OpenError
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SWI osPrintString
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BRI printError
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readFailed:
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SETD.0 ReadError
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SWI osPrintString
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printError:
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RSTA
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MVQB
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SWI osPrintNumber
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SETD.0 NewLine
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SWI osPrintString
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finished:
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SWI osExit
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#Data
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#Base 0x1000
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Usage:
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"more: give me a file name
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"
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OpenError:
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"more: cannot find the file, error "
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ReadError:
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"more: cannot read the file, error "
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NewLine:
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0x0A 0x00
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MorePrompt:
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"-- more --"
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ClearPrompt:
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0x0A 0x00
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Name:
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#Reserve 0d29
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Remaining:
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0x00 0x00
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LinesLeft:
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0x00
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#Include fileStream.asm
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@@ -0,0 +1,80 @@
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; Print a text file without asking it to fit in Data Memory.
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; fileStream.asm owns finding the file and walking its blocks. Type owns only what makes
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; it Type: send each byte to the console until the stream says there are no more.
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;
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; Written by ChatGPT for Anachronaut's SplitBit
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#Include services.asm
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#Program
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#Base 0x2000
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start:
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SETD.0 Name
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INIB 0d29
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SWI osArgument
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SETD.0 Name
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LDA.0
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BRA noName
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CALL fileStreamOpen
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BNQ openFailed
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nextBlock:
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CALL fileStreamNext
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BNQ readFailed
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PSHD.3
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POPB
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POPA
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SETD.2 Remaining
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STA.2
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INCD.2
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STB.2
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OR
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BRQ finished
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SETD.1 FileStreamBlock
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SETD.2 Remaining
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printLoop:
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LDA.1
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OUTA 0x00
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INCD.1
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CALL fileStreamTakeRemaining
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BRQ nextBlock
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BRI printLoop
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noName:
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SETD.0 Usage
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SWI osPrintString
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SWI osExit
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openFailed:
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SETD.0 OpenError
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SWI osPrintString
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BRI printError
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readFailed:
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SETD.0 ReadError
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SWI osPrintString
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printError:
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RSTA
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MVQB
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SWI osPrintNumber
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SETD.0 NewLine
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SWI osPrintString
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finished:
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SWI osExit
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#Data
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#Base 0x1000
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Usage:
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"type: give me a file name
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"
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OpenError:
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"type: cannot find the file, error "
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ReadError:
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"type: cannot read the file, error "
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NewLine:
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0x0A 0x00
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Name:
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#Reserve 0d29
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Remaining:
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0x00 0x00
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#Include fileStream.asm
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@@ -138,6 +138,8 @@ from every assembly file in it. Several are old programs written for the bare ma
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| Break | Stops itself twice with SWI osBreak, so that the registers can be seen changing between one stop and the next. |
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| Edit | A line editor. |
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| Stream | Reads an 84,000 byte file through a buffer of 256, which is what says a file bigger than Data Memory can be read at all. |
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| Type | Prints a named text file a block at a time, including one too large to fit in Data Memory. |
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| More | A forward-only pager. Space advances a screen, Return one line, and q stops. |
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### The Monitor:
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@@ -0,0 +1,141 @@
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; Read a named file from beginning to end, one block at a time.
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;
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; DP0 = filename
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; CALL fileStreamOpen Q = 0, or the osFileInfo error
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; CALL fileStreamNext Q = 0, or the osFileBlock error
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; DP3 = bytes in FileStreamBlock; zero means EOF
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;
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; This is application-side machinery built on CosmOS services, not a filesystem and not
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; yet an OS stream. Open remembers the address of the caller's filename, which must remain
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; valid until the one stream is finished.
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;
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; Written by ChatGPT for Anachronaut's SplitBit
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#Program
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fileStreamOpen:
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SETD.3 FileStreamName
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STD.0.3
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SWI osFileInfo
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BNQ fileStreamReturn
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PSHD.3
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POPB
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POPA
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SETD.3 FileStreamBlocks
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STA.3
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INCD.3
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STB.3
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SETD.3 FileStreamIndex
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RSTA
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STA.3
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INCD.3
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STA.3
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fileStreamReturn:
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RET
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fileStreamNext:
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SETD.3 FileStreamBlocks
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LDA.3
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INCD.3
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LDB.3
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OR
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BRQ fileStreamEnd
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SETD.3 FileStreamName
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LDD.0.3
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SETD.1 FileStreamBlock
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SETD.3 FileStreamIndex
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LDA.3
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INCD.3
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LDB.3
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SWI osFileBlock
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BNQ fileStreamReturn
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; DP3 is the service's return value and also the pointer this routine uses for all of
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; its bookkeeping. Keep the value before touching the pointer, then restore it at the
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; one successful return below.
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PSHD.3
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POPB
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POPA
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SETD.3 FileStreamCount
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STA.3
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INCD.3
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STB.3
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; Index++.
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SETD.3 FileStreamIndex
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INCD.3
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LDA.3
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INCA
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STA.3
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BNC fileStreamTakeBlock
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DECD.3
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LDA.3
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INCA
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STA.3
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fileStreamTakeBlock:
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; Blocks--.
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SETD.3 FileStreamBlocks
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INCD.3
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LDA.3
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BRA fileStreamBlocksBorrow
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DECA
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STA.3
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BRI fileStreamReadReturn
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fileStreamBlocksBorrow:
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INIA 0xFF
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STA.3
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DECD.3
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LDA.3
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DECA
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STA.3
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fileStreamReadReturn:
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SETD.3 FileStreamCount
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LDD.3.3
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RET
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fileStreamEnd:
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; There is no reset-pointer instruction. Two zero bytes through the Stack are the
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; literal construction of a zero Data Pointer.
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RSTA
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PSHA
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PSHA
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POPD.3
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RET
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; DP2 names a big-endian sixteen-bit byte count. Decrement it, returning Q = 0 when it
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; reached zero and nonzero while bytes remain. This is shared because correctly counting
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; a full 0x0100-byte block is the least interesting part of both applications to duplicate.
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fileStreamTakeRemaining:
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INCD.2
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LDA.2
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BRA fileStreamRemainingBorrow
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DECA
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STA.2
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DECD.2
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LDB.2
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INCD.2
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LDA.2
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OR
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RET
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fileStreamRemainingBorrow:
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INIA 0xFF
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STA.2
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DECD.2
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LDA.2
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DECA
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STA.2
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LDB.2
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INCD.2
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LDA.2
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OR
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RET
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#Data
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FileStreamName:
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0x00 0x00
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FileStreamBlocks:
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0x00 0x00
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FileStreamIndex:
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0x00 0x00
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FileStreamCount:
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0x00 0x00
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FileStreamBlock:
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#Reserve 0d256
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@@ -0,0 +1,89 @@
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CosmOS
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> loaded, starting at 2000
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> first line
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second line
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line 00: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 01: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 02: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 03: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 04: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 05: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 06: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 07: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 08: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 09: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 10: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 11: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 12: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 13: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 14: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 15: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 16: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 17: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 18: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 19: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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-- more --
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finished
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> first line
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second line
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line 00: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 01: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 02: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 03: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 04: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 05: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 06: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 07: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 08: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 09: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 10: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 11: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 12: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 13: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 14: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 15: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 16: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 17: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 18: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 19: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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-- more --
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line 20: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 21: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 22: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 23: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 24: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 25: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 26: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 27: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 28: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 29: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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finished
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> first line
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second line
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line 00: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 01: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 02: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 03: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 04: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 05: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 06: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 07: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 08: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 09: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 10: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 11: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 12: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 13: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 14: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 15: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 16: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 17: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 18: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 19: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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-- more --
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line 20: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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-- more --
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finished
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> halted
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Execution halted.
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[exit 0]
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@@ -0,0 +1,43 @@
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CosmOS
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> loaded, starting at 2000
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> first line
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second line
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line 00: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 01: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 02: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 03: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 04: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 05: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 06: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 07: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 08: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 09: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 10: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 11: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 12: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 13: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 14: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 15: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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line 16: ABCDEFGHIJKLMNOPQRSTUVWXYZ
|
||||
line 17: ABCDEFGHIJKLMNOPQRSTUVWXYZ
|
||||
line 18: ABCDEFGHIJKLMNOPQRSTUVWXYZ
|
||||
line 19: ABCDEFGHIJKLMNOPQRSTUVWXYZ
|
||||
line 20: ABCDEFGHIJKLMNOPQRSTUVWXYZ
|
||||
line 21: ABCDEFGHIJKLMNOPQRSTUVWXYZ
|
||||
line 22: ABCDEFGHIJKLMNOPQRSTUVWXYZ
|
||||
line 23: ABCDEFGHIJKLMNOPQRSTUVWXYZ
|
||||
line 24: ABCDEFGHIJKLMNOPQRSTUVWXYZ
|
||||
line 25: ABCDEFGHIJKLMNOPQRSTUVWXYZ
|
||||
line 26: ABCDEFGHIJKLMNOPQRSTUVWXYZ
|
||||
line 27: ABCDEFGHIJKLMNOPQRSTUVWXYZ
|
||||
line 28: ABCDEFGHIJKLMNOPQRSTUVWXYZ
|
||||
line 29: ABCDEFGHIJKLMNOPQRSTUVWXYZ
|
||||
finished
|
||||
> finished
|
||||
> type: cannot find the file, error 2
|
||||
finished
|
||||
> type: give me a file name
|
||||
finished
|
||||
> halted
|
||||
Execution halted.
|
||||
[exit 0]
|
||||
@@ -0,0 +1,6 @@
|
||||
load More.sbx
|
||||
run readable.txt
|
||||
qrun readable.txt
|
||||
run readable.txt
|
||||
|
||||
qexit
|
||||
@@ -0,0 +1,6 @@
|
||||
load Type.sbx
|
||||
run readable.txt
|
||||
run empty.txt
|
||||
run missing.txt
|
||||
run
|
||||
exit
|
||||
@@ -161,6 +161,22 @@ awk 'BEGIN { for (i = 0; i < 50; i++) printf "small %05d\n", i }' > small.txt
|
||||
"$ROOT/Programs/CosmOS/Apps/Stream.asm" -o "$WORK/Stream.sbx" >/dev/null
|
||||
"$TOOL" put "$DISKS/stream.img" "$WORK/Stream.sbx" >/dev/null
|
||||
|
||||
# A disk for Type. The first file crosses several blocks and deliberately has no zero byte
|
||||
# for the application to mistake for an end marker. The second proves that zero blocks is
|
||||
# a valid empty file rather than an error.
|
||||
"$TOOL" format "$DISKS/type.img" 64 2 >/dev/null
|
||||
printf 'first line\nsecond line\n' > readable.txt
|
||||
awk 'BEGIN { for (i = 0; i < 30; i++) printf "line %02d: ABCDEFGHIJKLMNOPQRSTUVWXYZ\n", i }' >> readable.txt
|
||||
: > empty.txt
|
||||
"$TOOL" put "$DISKS/type.img" readable.txt >/dev/null
|
||||
"$TOOL" put "$DISKS/type.img" empty.txt >/dev/null
|
||||
"$ROOT/Assembler" -I "$ROOT/Programs/CosmOS/Source" \
|
||||
"$ROOT/Programs/CosmOS/Apps/Type.asm" -o "$WORK/Type.sbx" >/dev/null
|
||||
"$TOOL" put "$DISKS/type.img" "$WORK/Type.sbx" >/dev/null
|
||||
"$ROOT/Assembler" -I "$ROOT/Programs/CosmOS/Source" \
|
||||
"$ROOT/Programs/CosmOS/Apps/More.asm" -o "$WORK/More.sbx" >/dev/null
|
||||
"$TOOL" put "$DISKS/type.img" "$WORK/More.sbx" >/dev/null
|
||||
|
||||
# A disk for the assembler that runs on the machine. It holds a source file and the two
|
||||
# programs that check the front end - the reader on its own and the tokenizer on its own -
|
||||
# because a fault in either of those would otherwise turn up much later as a mysterious
|
||||
|
||||
@@ -316,6 +316,14 @@ cosmosServices | CosmOS/Source/cosmos.asm | run | cosmosFil
|
||||
# notice the file moved - and that one would otherwise pass, since the blocks are still
|
||||
# there and still hold the same bytes.
|
||||
cosmosStream | CosmOS/Source/cosmos.asm | run | cosmosStream.in | - | disks/stream.img
|
||||
# A useful application made out of the streaming primitive: print a named text file without
|
||||
# requiring it to fit in Data Memory. The fixture crosses block boundaries, includes a full
|
||||
# 256-byte block, and also checks empty, missing, and absent filename cases.
|
||||
cosmosType | CosmOS/Source/cosmos.asm | run | cosmosType.in | - | disks/type.img
|
||||
# The same stream with interaction layered on it. Three runs exercise q, a whole screen
|
||||
# with Space, and one line with Return. The input is intentionally packed so that the one
|
||||
# byte the pager consumes leaves the next shell command immediately behind it.
|
||||
cosmosMore | CosmOS/Source/cosmos.asm | run | cosmosMore.in | - | disks/type.img
|
||||
# The assembler's front end, checked in two pieces before anything is built on it.
|
||||
#
|
||||
# cosmosSource reads a source file and prints it back. The file crosses a block boundary,
|
||||
@@ -340,6 +348,8 @@ app-Break | CosmOS/Apps/Break.asm | assemble | -
|
||||
app-Edit | CosmOS/Apps/Edit.asm | assemble | - | -
|
||||
app-Files | CosmOS/Apps/Files.asm | assemble | - | -
|
||||
app-Stream | CosmOS/Apps/Stream.asm | assemble | - | -
|
||||
app-Type | CosmOS/Apps/Type.asm | assemble | - | -
|
||||
app-More | CosmOS/Apps/More.asm | assemble | - | -
|
||||
# The assembler that runs on the machine, and its parts. Checked on their own so that a
|
||||
# failure reads as "it does not assemble" rather than as a broken disk image.
|
||||
asm-Asm | CosmOS/Assembler/Asm.asm | assemble | - | -
|
||||
|
||||
Reference in New Issue
Block a user