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61 lines
2.2 KiB
61 lines
2.2 KiB
/*****************************************************************************
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*
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* stream.h
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*
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*****************************************************************************/
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/*****************************************************************************
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*
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* File handles
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*
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*****************************************************************************/
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#define cbErr ((CB)-1)
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/*****************************************************************************
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*
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* Streams
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*
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* A STREAM is something that produces characters (not tokens).
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*
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* Streams can be (and frequently are) chained. When a stream
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* runs out of characters, the stream pointed to by pstmNext
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* becomes the new source of characters.
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*
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* For example, when you perform an `include', a new file stream
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* is created and pushed onto the head of the stream list. When
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* a macro is expanded, a new string stream is created and pushed
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* onto the head of the stream list.
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*
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*****************************************************************************/
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typedef struct STREAM STM, *PSTM;
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struct STREAM { /* stm */
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D(SIG sig;) /* Signature */
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PTCH ptchCur; /* Next byte to return from stream */
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PTCH ptchMax; /* One past last byte in stream */
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PTCH ptchMin; /* Beginning of stream buffer */
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HF hf; /* File handle (or hfNil if not a file) */
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PTCH ptchName; /* Name of file */
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PSTM pstmNext; /* Next stream in the chain */
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};
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#define sigStm sigABCD('S', 't', 'r', 'm')
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#define AssertPstm(pstm) AssertPNm(pstm, Stm)
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TCH STDCALL tchPeek(void);
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TCH STDCALL tchGet(void);
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void STDCALL UngetTch(TCH tch);
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PSTM STDCALL pstmPushStringCtch(CTCH ctch);
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PSTM STDCALL pstmPushHfPtch(HFILE hf, PTCH ptch);
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void STDCALL PushPtok(PCTOK ptok);
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void STDCALL PushZPtok(PDIV pdiv, PCTOK ptok);
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void STDCALL PushTch(TCH tch);
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void STDCALL PushQuotedPtok(PCTOK ptok);
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extern PSTM g_pstmCur; /* Current head of stream chain */
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#define ctchMinPush 1024 /* minimum string stream size */
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#define ctchFile 4096 /* minimum file stream size */
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