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101 lines
3.3 KiB
C
101 lines
3.3 KiB
C
/*
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* file - file I/O routines callable by users
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*
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* Copyright (C) 1999-2007,2014,2021,2023 David I. Bell and Landon Curt Noll
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*
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* Primary author: David I. Bell
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*
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* Calc is open software; you can redistribute it and/or modify it under
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* the terms of the version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* Calc is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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* Public License for more details.
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*
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* A copy of version 2.1 of the GNU Lesser General Public License is
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* distributed with calc under the filename COPYING-LGPL. You should have
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* received a copy with calc; if not, write to Free Software Foundation, Inc.
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Under source code control: 1996/05/24 05:55:58
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* File existed as early as: 1996
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*
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* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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*/
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#if !defined(INCLUDE_FILE_H)
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#define INCLUDE_FILE_H
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#if defined(CALC_SRC) /* if we are building from the calc source tree */
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# include "have_fgetsetpos.h"
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#else
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# include <calc/have_fgetsetpos.h>
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#endif
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/*
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* Definition of opened files.
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*/
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#define MODE_LEN (sizeof("rb+")-1)
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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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bool appending; /* true if also opened for appending */
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bool binary; /* true if binary mode - mode ignored/unused */
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char action; /* most recent use for 'r', 'w' or 0 */
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char mode[MODE_LEN+1]; /* 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 beginning 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_FGETSETPOS)
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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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E_FUNC FILEIO * findid(FILEID id, int writable);
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E_FUNC int fgetposid(FILEID id, FILEPOS *ptr);
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E_FUNC int fsetposid(FILEID id, FILEPOS *ptr);
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E_FUNC int get_open_siz(FILE *fp, ZVALUE *res);
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E_FUNC char* findfname(FILEID);
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E_FUNC FILE *f_pathopen(char *name, char *mode, char *pathlist,
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char **openpath);
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#endif /* !INCLUDE_FILE_H */
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