/*  ibicc - The Ibi C Compiler
    Copyright (C) 2004 Antti-Juhani Kaijanaho

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.

    2. Redistributions in binary form must reproduce the above
       copyright notice, this list of conditions and the following
       disclaimer in the documentation and/or other materials provided
       with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
    OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
    GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
    WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef FILE_H
#define FILE_H

#include "strutil.h"

#include <stddef.h>

#include <unistd.h>

struct actual_file {
	unsigned real_file : 1;
#ifdef _POSIX_MAPPED_FILES
	unsigned mmapped : 1;
#endif
	char *fname;
	int fd;
	size_t bn;
	size_t bmaxn;
	unsigned char *buf; /* file buffer (mmapped if possible) */
};

struct file {
	struct actual_file *af;
	int current_line;
	struct file *parent;
	int is_beginning_of_logical_line;
	int is_system_file;
	size_t bi;
};

#define get_substr(st, f) ((st)->buf = (f)->af->buf, \
                           (st)->start = (f)->bi, \
                           (st)->len = 0)
#define file_substr_add(st, f) ((assert((st)->buf == (f)->af->buf)), \
				(assert(file_peek((f)) != -1)), \
				(++(st)->len))

#define file_peek(f) ((f)->bi >= (f)->af->bn \
                        || (f)->af->buf[(f)->bi] == '\\' \
                      ? file_peek_((f)) : (f)->af->buf[(f)->bi])

struct file *new_string_file(char const *filename, int line,
			     struct file *parent, char const *buf);

struct file *new_file(char const *filename, struct file *parent, int system_file);

struct file *close_file(struct file *file);

int file_peek_(struct file *f);
int file_get(struct file *f);
void file_eat(struct file *f, int c1);


#endif /* FILE_H */