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/*

  (c) Copyright 1992 Eric Backus

  This software may be used freely so long as this copyright notice is

  left intact.  There is no warrantee on this software.

*/

#include <sys/stat.h>

#include <string.h>

#include <stdlib.h>

#include "dos.h"

#include <errno.h>

#include <stdio.h>

extern int      _stat_assist(const char *, struct stat *);

extern void     _fixpath(const char *, char *);

struct path_list

{

    struct path_list    *next;

    char                *path;

    int                 inode;

};

static int

fixinode(const char *path, struct stat *buf)

{

    static struct path_list     *path_list[1256];

    /* Start the inode count at three, since root path should be two */

    static int                  inode_count = 3;

    struct path_list            *path_ptr, *prev_ptr;

    const char                  *p;

    int                         hash;

    /* Skip over device and leading '/' */

    if (path[1] == ':' && path[2] == '/') path += 3;

    /* We could probably use a better hash than this */

    p = path;

    hash = 0;

    while (*p != '\0') hash += *p++;

    hash = hash & 0xff;

    /* Have we seen this string? */

    path_ptr = path_list[hash];

    prev_ptr = path_ptr;

    while (path_ptr)

    {

        if (strcmp(path, path_ptr->path) == 0) break;

        prev_ptr = path_ptr;

        path_ptr = path_ptr->next;

    }

    if (path_ptr)

        /* Same string, so same inode */

        buf->st_ino = path_ptr->inode;

    else

    {

        /* New string with same hash code */

        path_ptr = malloc(sizeof *path_ptr);

        if (path_ptr == NULL)

          {

            errno = ENOMEM;

            return -1;

          }

        path_ptr->next = NULL;

        path_ptr->path = strdup(path);

        if (path_ptr->path == NULL)

          {

            errno = ENOMEM;

            return -1;

          }

        path_ptr->inode = inode_count;

        if (prev_ptr)

            prev_ptr->next = path_ptr;

        else

            path_list[hash] = path_ptr;

        buf->st_ino = inode_count;

        inode_count++;

    }

    return 0;

}

int

stat(const char *path, struct stat *buf)

{

    static int  stat_called_before = 0;

    char        p[1090];        /* Should be p[PATH_MAX+1] */

    int         status;

    /* Normalize the path */

    _fixpath(path, p);

    /* Work around strange bug with stat and time */

    if (!stat_called_before)

    {

        stat_called_before = 1;

        (void) time((time_t *) 0);

    }

    /* Check for root path */

    if (strcmp(p, "/") == 0 || strcmp(p + 1, ":/") == 0)

    {

        /* Handle root path as special case, stat_assist doesn't like

           the root directory. */

        if (p[1] == ':')

        {

            if (p[0] >= 'a' && p[0] <= 'z')

                buf->st_dev = p[0] - 'a';

            else

                buf->st_dev = p[0] - 'A';

        }

        else

            buf->st_dev = -1;   /* No device? */

        buf->st_ino = 2;        /* Root path always inode 2 */

        buf->st_mode = S_IFDIR | S_IREAD | S_IWRITE | S_IEXEC;

        buf->st_nlink = 1;

        buf->st_uid = getuid();

        buf->st_gid = getgid();

        buf->st_rdev = buf->st_dev;

        buf->st_size = 0;

        buf->st_atime = 0;

        buf->st_mtime = 0;

        buf->st_ctime = 0;

        buf->st_blksize = 512;  /* Not always correct? */

        status = 0;

    }

    else

    {

        status = _stat_assist(p, buf);

        /* Make inode numbers unique */

        if (status == 0) status = fixinode(p, buf);

        /* The stat_assist does something weird with st_dev, but sets

           st_rdev to the drive number.  Fix st_dev. */

        buf->st_dev = buf->st_rdev;

        /* Make all files owned by ourself. */

        buf->st_uid = getuid();

        buf->st_gid = getgid();

        /* Make all directories writable.  They always are in DOS, but

           stat_assist doesn't think so. */

        if (S_ISDIR(buf->st_mode)) buf->st_mode |= S_IWRITE;

    }

    return status;

}