48 lines
1.7 KiB
C
48 lines
1.7 KiB
C
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/*-------------------------------------------------------------------------
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*
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* buffile.h
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* Management of large buffered files, primarily temporary files.
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*
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* The BufFile routines provide a partial replacement for stdio atop
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* virtual file descriptors managed by fd.c. Currently they only support
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* buffered access to a virtual file, without any of stdio's formatting
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* features. That's enough for immediate needs, but the set of facilities
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* could be expanded if necessary.
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*
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* BufFile also supports working with temporary files that exceed the OS
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* file size limit and/or the largest offset representable in an int.
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* It might be better to split that out as a separately accessible module,
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* but currently we have no need for oversize temp files without buffered
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* access.
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: buffile.h,v 1.1 1999/10/13 15:02:32 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef BUFFILE_H
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#define BUFFILE_H
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#include "storage/fd.h"
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/* BufFile is an opaque type whose details are not known outside buffile.c. */
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typedef struct BufFile BufFile;
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/*
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* prototypes for functions in buffile.c
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*/
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extern BufFile *BufFileCreateTemp(void);
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extern BufFile *BufFileCreate(File file);
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extern BufFile *BufFileReaccess(BufFile *file);
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extern void BufFileClose(BufFile *file);
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extern size_t BufFileRead(BufFile *file, void *ptr, size_t size);
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extern size_t BufFileWrite(BufFile *file, void *ptr, size_t size);
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extern int BufFileSeek(BufFile *file, int fileno, long offset, int whence);
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extern void BufFileTell(BufFile *file, int *fileno, long *offset);
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#endif /* BUFFILE_H */
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