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61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
/*
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* Copyright (c) 1996 David I. Bell
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* Permission is granted to use, distribute, or modify this source,
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* provided that this copyright notice remains intact.
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*
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* File I/O routines callable by users.
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*/
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#include "have_fpos.h"
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/*
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* Definition of opened files.
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*/
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typedef struct {
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FILEID id; /* id to identify this file */
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FILE *fp; /* real file structure for I/O */
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dev_t dev; /* file device */
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ino_t inode; /* file inode */
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char *name; /* file name */
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BOOL reading; /* TRUE if opened for reading */
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BOOL writing; /* TRUE if opened for writing */
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char action; /* most recent use for 'r', 'w' or 0 */
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char mode[3]; /* open mode */
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} FILEIO;
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/*
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* fgetpos/fsetpos vs fseek/ftell interface
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*
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* f_seek_set(FILE *stream, FILEPOS *loc)
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* Seek loc bytes from the beginning of the open file, stream.
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*
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* f_tell(FILE *stream, FILEPOS *loc)
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* Set loc to bytes from the beinning of the open file, stream.
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*
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* We assume that if your system does not have fgetpos/fsetpos,
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* then it will have a FILEPOS that is a scalar type (e.g., long).
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* Some obscure systems without fgetpos/fsetpos may not have a simple
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* scalar type. In these cases the f_tell macro below will fail.
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*/
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#if defined(HAVE_FPOS)
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#define f_seek_set(stream, loc) fsetpos((FILE*)(stream), (FILEPOS*)(loc))
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#define f_tell(stream, loc) fgetpos((FILE*)(stream), (FILEPOS*)(loc))
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#else
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#define f_seek_set(stream, loc) \
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fseek((FILE*)(stream), *(FILEPOS*)(loc), SEEK_SET)
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#define f_tell(stream, loc) (*((FILEPOS*)(loc)) = ftell((FILE*)(stream)))
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#endif
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/*
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* external functions
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*/
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extern int fgetposid(FILEID id, FILEPOS *ptr);
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extern int fsetposid(FILEID id, FILEPOS *ptr);
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