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/*
* file - file I/O routines callable by users
*
* Copyright (C) 1999-2006 David I. Bell and Landon Curt Noll
*
* Primary author: David I. Bell
*
* Calc is open software; you can redistribute it and/or modify it under
* the terms of the version 2.1 of the GNU Lesser General Public License
* as published by the Free Software Foundation.
*
* Calc is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
* Public License for more details.
*
* A copy of version 2.1 of the GNU Lesser General Public License is
* distributed with calc under the filename COPYING-LGPL. You should have
* received a copy with calc; if not, write to Free Software Foundation, Inc.
* 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
* @(#) $Revision: 29.8 $
* @(#) $Id: file.h,v 29.8 2006/05/19 15:26:10 chongo Exp $
* @(#) $Source: /usr/local/src/cmd/calc/RCS/file.h,v $
*
* Under source code control: 1996/05/24 05:55:58
* File existed as early as: 1996
*
* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
*/
#if !defined(__FILE_H__)
#define __FILE_H__
#if defined(CALC_SRC) /* if we are building from the calc source tree */
# include "have_fpos.h"
#else
# include <calc/have_fpos.h>
#endif
/*
* Definition of opened files.
*/
typedef struct {
FILEID id; /* id to identify this file */
FILE *fp; /* real file structure for I/O */
dev_t dev; /* file device */
ino_t inode; /* file inode */
char *name; /* file name */
BOOL reading; /* TRUE if opened for reading */
BOOL writing; /* TRUE if opened for writing */
BOOL appending; /* TRUE if also opened for appending */
BOOL binary; /* TRUE if binary mode - mode ignored/unused */
char action; /* most recent use for 'r', 'w' or 0 */
char mode[sizeof("rb+")+1];/* open mode */
} FILEIO;
/*
* fgetpos/fsetpos vs fseek/ftell interface
*
* f_seek_set(FILE *stream, FILEPOS *loc)
* Seek loc bytes from the beginning of the open file, stream.
*
* f_tell(FILE *stream, FILEPOS *loc)
* Set loc to bytes from the beinning of the open file, stream.
*
* We assume that if your system does not have fgetpos/fsetpos,
* then it will have a FILEPOS that is a scalar type (e.g., long).
* Some obscure systems without fgetpos/fsetpos may not have a simple
* scalar type. In these cases the f_tell macro below will fail.
*/
#if defined(HAVE_FPOS)
#define f_seek_set(stream, loc) fsetpos((FILE*)(stream), (FILEPOS*)(loc))
#define f_tell(stream, loc) fgetpos((FILE*)(stream), (FILEPOS*)(loc))
#else
#define f_seek_set(stream, loc) \
fseek((FILE*)(stream), *(FILEPOS*)(loc), SEEK_SET)
#define f_tell(stream, loc) (*((FILEPOS*)(loc)) = ftell((FILE*)(stream)))
#endif
/*
* external functions
*/
extern DLL FILEIO * findid(FILEID id, int writable);
extern DLL int fgetposid(FILEID id, FILEPOS *ptr);
extern DLL int fsetposid(FILEID id, FILEPOS *ptr);
extern DLL int get_open_siz(FILE *fp, ZVALUE *res);
extern DLL char* findfname(FILEID);
extern DLL FILE *f_pathopen(char *name, char *mode, char *pathlist, char **openpath);
#endif /* !__FILE_H__ */
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