View of xos/fs/file_systems.c

/* Copyright (C) 2008  Emmanuel Varoquaux
 
   This file is part of XOS.
 
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
 
   This program 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 General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>. */
 
#include "file_system_struct.h"
 
#include <verify_area.h>
#include <kmalloc.h>
#include <segment.h>
#include <errno.h>
#include <consts.h>
#include <sprintf.h>
#include <stddef.h>
 
/* Les noms de systemes de fichiers doivent etre plus courts que cette limite. */
#define FILESYSTEM_NAME_MAX 32
 
extern const struct file_system_struct rootfs;
extern const struct file_system_struct devfs;
extern const struct file_system_struct procfs;
extern const struct file_system_struct vfat;
extern const struct file_system_struct ramfs;
 
/* table des systemes de fichiers */
static const struct file_system_struct *file_system_table[] = {
  &rootfs,
  &devfs,
  &procfs,
  &vfat,
  &ramfs
};
static const unsigned int file_system_table_size = sizeof file_system_table / sizeof *file_system_table;
 
/* Fontions utilitaires */
 
static inline int fs_strcmp(const char *fs_s1, const char *s2)
{
  char c;
 
  while ((c = get_fs_byte(fs_s1)) && c == *s2)
    fs_s1++, s2++;
  return c - *s2;
}
 
/* file_systems */
 
int get_file_system(const char *fs_type, const struct file_system_struct **file_system)
{
  const struct file_system_struct **fs;
 
  if (!verify_str(fs_type, FILESYSTEM_NAME_MAX, NULL))
    return -EFAULT;
 
  for (fs = &file_system_table[0]; fs < &file_system_table[file_system_table_size]; fs++)
    if (!fs_strcmp(fs_type, (*fs)->name)) {
      *file_system = *fs;
      return 0;
    }
  return -ENODEV;
}
 
/* procfs */
 
int print_file_systems(char *buf, unsigned int size)
{
  char *s;
  const struct file_system_struct **fs;
  unsigned int n;
 
  s = buf;
  for (fs = &file_system_table[0]; fs < &file_system_table[file_system_table_size]; fs++) {
    n = snprintf(s, size, "%-8s%s\n", (*fs)->type == FT_BLK ? "" : "nodev", (*fs)->name);
    s += n;
    size = size > n ? size - n : 0;
  }
  return s - buf;
}