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/*
 * DOS file system functions
 *
 * Copyright 1993 Erik Bos
 * Copyright 1996 Alexandre Julliard
 */

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#include "config.h"
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#include <sys/types.h>
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#include <ctype.h>
#include <dirent.h>
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#include <errno.h>
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#include <sys/errno.h>
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#include <fcntl.h>
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#include <string.h>
#include <stdlib.h>
#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <time.h>
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#include <unistd.h>
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#include "winerror.h"
#include "wingdi.h"

#include "wine/unicode.h"
#include "wine/winbase16.h"
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#include "drive.h"
#include "file.h"
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#include "heap.h"
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#include "msdos.h"
#include "wine/server.h"
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DEFAULT_DEBUG_CHANNEL(dosfs);
DECLARE_DEBUG_CHANNEL(file);
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/* Define the VFAT ioctl to get both short and long file names */
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/* FIXME: is it possible to get this to work on other systems? */
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#ifdef linux
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/* We want the real kernel dirent structure, not the libc one */
typedef struct
{
    long d_ino;
    long d_off;
    unsigned short d_reclen;
    char d_name[256];
} KERNEL_DIRENT;

#define VFAT_IOCTL_READDIR_BOTH  _IOR('r', 1, KERNEL_DIRENT [2] )

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#else   /* linux */
#undef VFAT_IOCTL_READDIR_BOTH  /* just in case... */
#endif  /* linux */
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/* Chars we don't want to see in DOS file names */
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#define INVALID_DOS_CHARS  "*?<>|\"+=,;[] \345"
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static const DOS_DEVICE DOSFS_Devices[] =
/* name, device flags (see Int 21/AX=0x4400) */
{
    { "CON",		0xc0d3 },
    { "PRN",		0xa0c0 },
    { "NUL",		0x80c4 },
    { "AUX",		0x80c0 },
    { "LPT1",		0xa0c0 },
    { "LPT2",		0xa0c0 },
    { "LPT3",		0xa0c0 },
    { "LPT4",		0xc0d3 },
    { "COM1",		0x80c0 },
    { "COM2",		0x80c0 },
    { "COM3",		0x80c0 },
    { "COM4",		0x80c0 },
    { "SCSIMGR$",	0xc0c0 },
    { "HPSCAN",		0xc0c0 }
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};

#define GET_DRIVE(path) \
    (((path)[1] == ':') ? FILE_toupper((path)[0]) - 'A' : DOSFS_CurDrive)
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/* Directory info for DOSFS_ReadDir */
typedef struct
{
    DIR           *dir;
#ifdef VFAT_IOCTL_READDIR_BOTH
    int            fd;
    char           short_name[12];
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    KERNEL_DIRENT  dirent[2];
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#endif
} DOS_DIR;

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/* Info structure for FindFirstFile handle */
typedef struct
{
    LPSTR path;
    LPSTR long_mask;
    LPSTR short_mask;
    BYTE  attr;
    int   drive;
    int   cur_pos;
    DOS_DIR *dir;
} FIND_FIRST_INFO;


static WINE_EXCEPTION_FILTER(page_fault)
{
    if (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION)
        return EXCEPTION_EXECUTE_HANDLER;
    return EXCEPTION_CONTINUE_SEARCH;
}

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/***********************************************************************
 *           DOSFS_ValidDOSName
 *
 * Return 1 if Unix file 'name' is also a valid MS-DOS name
 * (i.e. contains only valid DOS chars, lower-case only, fits in 8.3 format).
 * File name can be terminated by '\0', '\\' or '/'.
 */
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static int DOSFS_ValidDOSName( const char *name, int ignore_case )
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{
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    static const char invalid_chars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" INVALID_DOS_CHARS;
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    const char *p = name;
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    const char *invalid = ignore_case ? (invalid_chars + 26) : invalid_chars;
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    int len = 0;

    if (*p == '.')
    {
        /* Check for "." and ".." */
        p++;
        if (*p == '.') p++;
        /* All other names beginning with '.' are invalid */
        return (IS_END_OF_NAME(*p));
    }
    while (!IS_END_OF_NAME(*p))
    {
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        if (strchr( invalid, *p )) return 0;  /* Invalid char */
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        if (*p == '.') break;  /* Start of the extension */
        if (++len > 8) return 0;  /* Name too long */
        p++;
    }
    if (*p != '.') return 1;  /* End of name */
    p++;
    if (IS_END_OF_NAME(*p)) return 0;  /* Empty extension not allowed */
    len = 0;
    while (!IS_END_OF_NAME(*p))
    {
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        if (strchr( invalid, *p )) return 0;  /* Invalid char */
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        if (*p == '.') return 0;  /* Second extension not allowed */
        if (++len > 3) return 0;  /* Extension too long */
        p++;
    }
    return 1;
}


/***********************************************************************
 *           DOSFS_ToDosFCBFormat
 *
 * Convert a file name to DOS FCB format (8+3 chars, padded with blanks),
 * expanding wild cards and converting to upper-case in the process.
 * File name can be terminated by '\0', '\\' or '/'.
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 * Return FALSE if the name is not a valid DOS name.
 * 'buffer' must be at least 12 characters long.
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 */
BOOL DOSFS_ToDosFCBFormat( LPCSTR name, LPSTR buffer )
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{
    static const char invalid_chars[] = INVALID_DOS_CHARS;
    const char *p = name;
    int i;

    /* Check for "." and ".." */
    if (*p == '.')
    {
        p++;
        strcpy( buffer, ".          " );
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        if (*p == '.')
        {
            buffer[1] = '.';
            p++;
        }
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        return (!*p || (*p == '/') || (*p == '\\'));
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    }

    for (i = 0; i < 8; i++)
    {
        switch(*p)
        {
        case '\0':
        case '\\':
        case '/':
        case '.':
            buffer[i] = ' ';
            break;
        case '?':
            p++;
            /* fall through */
        case '*':
            buffer[i] = '?';
            break;
        default:
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            if (strchr( invalid_chars, *p )) return FALSE;
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            p++;
            break;
        }
    }

    if (*p == '*')
    {
        /* Skip all chars after wildcard up to first dot */
        while (*p && (*p != '/') && (*p != '\\') && (*p != '.')) p++;
    }
    else
    {
        /* Check if name too long */
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        if (*p && (*p != '/') && (*p != '\\') && (*p != '.')) return FALSE;
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    }
    if (*p == '.') p++;  /* Skip dot */

    for (i = 8; i < 11; i++)
    {
        switch(*p)
        {
        case '\0':
        case '\\':
        case '/':
            buffer[i] = ' ';
            break;
        case '.':
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            return FALSE;  /* Second extension not allowed */
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        case '?':
            p++;
            /* fall through */
        case '*':
            buffer[i] = '?';
            break;
        default:
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            if (strchr( invalid_chars, *p )) return FALSE;
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            p++;
            break;
        }
    }
    buffer[11] = '\0';

    /* at most 3 character of the extension are processed
     * is something behind this ? 
     */
    while (*p == '*' || *p == ' ') p++; /* skip wildcards and spaces */
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}


/***********************************************************************
 *           DOSFS_ToDosDTAFormat
 *
 * Convert a file name from FCB to DTA format (name.ext, null-terminated)
 * converting to upper-case in the process.
 * File name can be terminated by '\0', '\\' or '/'.
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 * 'buffer' must be at least 13 characters long.
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 */
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static void DOSFS_ToDosDTAFormat( LPCSTR name, LPSTR buffer )
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{
    char *p;

    memcpy( buffer, name, 8 );
    p = buffer + 8;
    while ((p > buffer) && (p[-1] == ' ')) p--;
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    *p++ = '.';
    memcpy( p, name + 8, 3 );
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    if (p[-1] == '.') p--;
    *p = '\0';
}


/***********************************************************************
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 *           DOSFS_MatchShort
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 *
 * Check a DOS file name against a mask (both in FCB format).
 */
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static int DOSFS_MatchShort( const char *mask, const char *name )
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{
    int i;
    for (i = 11; i > 0; i--, mask++, name++)
        if ((*mask != '?') && (*mask != *name)) return 0;
    return 1;
}


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/***********************************************************************
 *           DOSFS_MatchLong
 *
 * Check a long file name against a mask.
 *
 * Tests (done in W95 DOS shell - case insensitive):
 * *.txt			test1.test.txt				*
 * *st1*			test1.txt				*
 * *.t??????.t*			test1.ta.tornado.txt			*
 * *tornado*			test1.ta.tornado.txt			*
 * t*t				test1.ta.tornado.txt			*
 * ?est*			test1.txt				*
 * ?est???			test1.txt				-
 * *test1.txt*			test1.txt				* 
 * h?l?o*t.dat			hellothisisatest.dat			*
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 */
static int DOSFS_MatchLong( const char *mask, const char *name,
                            int case_sensitive )
{
    const char *lastjoker = NULL;
    const char *next_to_retry = NULL;

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    if (!strcmp( mask, "*.*" )) return 1;
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    while (*name && *mask)
    {
        if (*mask == '*')
        {
            mask++;
            while (*mask == '*') mask++;  /* Skip consecutive '*' */
            lastjoker = mask;
            if (!*mask) return 1; /* end of mask is all '*', so match */

            /* skip to the next match after the joker(s) */
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            if (case_sensitive) while (*name && (*name != *mask)) name++;
            else while (*name && (FILE_toupper(*name) != FILE_toupper(*mask))) name++;
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        }
        else if (*mask != '?')
        {
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            if (case_sensitive)
            {
                if (FILE_toupper(*mask) != FILE_toupper(*name)) mismatch = 1;
            }
            if (!mismatch)
            {
                mask++;
                name++;
                if (*mask == '\0')
                {
                    if (*name == '\0')
                        return 1;
                    if (lastjoker)
                        mask = lastjoker;
                }
            }
            else /* mismatch ! */
            {
                if (lastjoker) /* we had an '*', so we can try unlimitedly */
                {
                    mask = lastjoker;

                    /* this scan sequence was a mismatch, so restart
                     * 1 char after the first char we checked last time */
                    next_to_retry++;
                    name = next_to_retry;
                }
                else
                    return 0; /* bad luck */
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    }
    while ((*mask == '.') || (*mask == '*'))
        mask++;  /* Ignore trailing '.' or '*' in mask */
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    return (!*name && !*mask);
}


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/***********************************************************************
 *           DOSFS_OpenDir
 */
static DOS_DIR *DOSFS_OpenDir( LPCSTR path )
{
    DOS_DIR *dir = HeapAlloc( GetProcessHeap(), 0, sizeof(*dir) );
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    if (!dir)
    {
        SetLastError( ERROR_NOT_ENOUGH_MEMORY );
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        return NULL;
    }

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    /* Treat empty path as root directory. This simplifies path split into
       directory and mask in several other places */
    if (!*path) path = "/";

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#ifdef VFAT_IOCTL_READDIR_BOTH

    /* Check if the VFAT ioctl is supported on this directory */

    if ((dir->fd = open( path, O_RDONLY )) != -1)
    {
        if (ioctl( dir->fd, VFAT_IOCTL_READDIR_BOTH, (long)dir->dirent ) == -1)
        {
            close( dir->fd );
            dir->fd = -1;
        }
        else
        {
            /* Set the file pointer back at the start of the directory */
            lseek( dir->fd, 0, SEEK_SET );
            dir->dir = NULL;
            return dir;
        }
    }
#endif  /* VFAT_IOCTL_READDIR_BOTH */

    /* Now use the standard opendir/readdir interface */

    if (!(dir->dir = opendir( path )))
    {
        HeapFree( GetProcessHeap(), 0, dir );
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        return NULL;
    }
    return dir;
}


/***********************************************************************
 *           DOSFS_CloseDir
 */
static void DOSFS_CloseDir( DOS_DIR *dir )
{
#ifdef VFAT_IOCTL_READDIR_BOTH
    if (dir->fd != -1) close( dir->fd );
#endif  /* VFAT_IOCTL_READDIR_BOTH */
    if (dir->dir) closedir( dir->dir );
    HeapFree( GetProcessHeap(), 0, dir );
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}


/***********************************************************************
 *           DOSFS_ReadDir
 */
static BOOL DOSFS_ReadDir( DOS_DIR *dir, LPCSTR *long_name,
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                             LPCSTR *short_name )
{
    struct dirent *dirent;

#ifdef VFAT_IOCTL_READDIR_BOTH
    if (dir->fd != -1)
    {
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        if (ioctl( dir->fd, VFAT_IOCTL_READDIR_BOTH, (long)dir->dirent ) != -1) {
	    if (!dir->dirent[0].d_reclen) return FALSE;
	    if (!DOSFS_ToDosFCBFormat( dir->dirent[0].d_name, dir->short_name ))
		dir->short_name[0] = '\0';
	    *short_name = dir->short_name;
	    if (dir->dirent[1].d_name[0]) *long_name = dir->dirent[1].d_name;
	    else *long_name = dir->dirent[0].d_name;
	    return TRUE;
	}
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    }
#endif  /* VFAT_IOCTL_READDIR_BOTH */

    if (!(dirent = readdir( dir->dir ))) return FALSE;
    *long_name  = dirent->d_name;
    *short_name = NULL;
    return TRUE;
}


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/***********************************************************************
 *           DOSFS_Hash
 *
 * Transform a Unix file name into a hashed DOS name. If the name is a valid
 * DOS name, it is converted to upper-case; otherwise it is replaced by a
 * hashed version that fits in 8.3 format.
 * File name can be terminated by '\0', '\\' or '/'.
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 * 'buffer' must be at least 13 characters long.
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 */
static void DOSFS_Hash( LPCSTR name, LPSTR buffer, BOOL dir_format,
                        BOOL ignore_case )
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{
    static const char invalid_chars[] = INVALID_DOS_CHARS "~.";
    static const char hash_chars[32] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ012345";

    const char *p, *ext;
    char *dst;
    unsigned short hash;
    int i;

    if (dir_format) strcpy( buffer, "           " );

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    if (DOSFS_ValidDOSName( name, ignore_case ))
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    {
        /* Check for '.' and '..' */
        if (*name == '.')
        {
            buffer[0] = '.';
            if (!dir_format) buffer[1] = buffer[2] = '\0';
            if (name[1] == '.') buffer[1] = '.';
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            return;
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        }

        /* Simply copy the name, converting to uppercase */

        for (dst = buffer; !IS_END_OF_NAME(*name) && (*name != '.'); name++)
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        if (*name == '.')
        {
            if (dir_format) dst = buffer + 8;
            else *dst++ = '.';
            for (name++; !IS_END_OF_NAME(*name); name++)
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        }
        if (!dir_format) *dst = '\0';
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        return;
    }

    /* Compute the hash code of the file name */
    /* If you know something about hash functions, feel free to */
    /* insert a better algorithm here... */
    if (ignore_case)
    {
        for (p = name, hash = 0xbeef; !IS_END_OF_NAME(p[1]); p++)
            hash = (hash<<3) ^ (hash>>5) ^ FILE_tolower(*p) ^ (FILE_tolower(p[1]) << 8);
        hash = (hash<<3) ^ (hash>>5) ^ FILE_tolower(*p); /* Last character*/
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    }
    else
    {
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        for (p = name, hash = 0xbeef; !IS_END_OF_NAME(p[1]); p++)
            hash = (hash << 3) ^ (hash >> 5) ^ *p ^ (p[1] << 8);
        hash = (hash << 3) ^ (hash >> 5) ^ *p;  /* Last character */
    }
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    /* Find last dot for start of the extension */
    for (p = name+1, ext = NULL; !IS_END_OF_NAME(*p); p++)
        if (*p == '.') ext = p;
    if (ext && IS_END_OF_NAME(ext[1]))
        ext = NULL;  /* Empty extension ignored */
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    /* Copy first 4 chars, replacing invalid chars with '_' */
    for (i = 4, p = name, dst = buffer; i > 0; i--, p++)
    {
        if (IS_END_OF_NAME(*p) || (p == ext)) break;
        *dst++ = strchr( invalid_chars, *p ) ? '_' : FILE_toupper(*p);
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    }
    /* Pad to 5 chars with '~' */
    while (i-- >= 0) *dst++ = '~';
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    /* Insert hash code converted to 3 ASCII chars */
    *dst++ = hash_chars[(hash >> 10) & 0x1f];
    *dst++ = hash_chars[(hash >> 5) & 0x1f];
    *dst++ = hash_chars[hash & 0x1f];
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    /* Copy the first 3 chars of the extension (if any) */
    if (ext)
    {
        if (!dir_format) *dst++ = '.';
        for (i = 3, ext++; (i > 0) && !IS_END_OF_NAME(*ext); i--, ext++)
            *dst++ = strchr( invalid_chars, *ext ) ? '_' : FILE_toupper(*ext);
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    }
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    if (!dir_format) *dst = '\0';
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}


/***********************************************************************
 *           DOSFS_FindUnixName
 *
 * Find the Unix file name in a given directory that corresponds to
 * a file name (either in Unix or DOS format).
 * File name can be terminated by '\0', '\\' or '/'.
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 * Return TRUE if OK, FALSE if no file name matches.
 *
 * 'long_buf' must be at least 'long_len' characters long. If the long name
 * turns out to be larger than that, the function returns FALSE.
 * 'short_buf' must be at least 13 characters long.
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 */
BOOL DOSFS_FindUnixName( LPCSTR path, LPCSTR name, LPSTR long_buf,
                           INT long_len, LPSTR short_buf, BOOL ignore_case)
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{
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    DOS_DIR *dir;
    LPCSTR long_name, short_name;
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    char dos_name[12], tmp_buf[13];
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    const char *p = strchr( name, '/' );
    int len = p ? (int)(p - name) : strlen(name);
    if ((p = strchr( name, '\\' ))) len = min( (int)(p - name), len );
    /* Ignore trailing dots and spaces */
    while (len > 1 && (name[len-1] == '.' || name[len-1] == ' ')) len--;
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    if (long_len < len + 1) return FALSE;
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    TRACE("%s,%s\n", path, name );
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    if (!DOSFS_ToDosFCBFormat( name, dos_name )) dos_name[0] = '\0';
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    if (!(dir = DOSFS_OpenDir( path )))
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    {
        WARN("(%s,%s): can't open dir: %s\n",
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                       path, name, strerror(errno) );
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        return FALSE;
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    }
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    while ((ret = DOSFS_ReadDir( dir, &long_name, &short_name )))
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    {
        /* Check against Unix name */
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        if (len == strlen(long_name))
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        {
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            if (!ignore_case)
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            {
                if (!strncmp( long_name, name, len )) break;
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            }
            else
            {
                if (!FILE_strncasecmp( long_name, name, len )) break;
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        if (dos_name[0])
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        {
            /* Check against hashed DOS name */
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            if (!short_name)
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            {
                DOSFS_Hash( long_name, tmp_buf, TRUE, ignore_case );
                short_name = tmp_buf;
            }
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            if (!strcmp( dos_name, short_name )) break;
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        }
    }
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    if (ret)
    {
        if (long_buf) strcpy( long_buf, long_name );
        if (short_buf)
        {
            if (short_name)
                DOSFS_ToDosDTAFormat( short_name, short_buf );
            else
                DOSFS_Hash( long_name, short_buf, FALSE, ignore_case );
        }
        TRACE("(%s,%s) -> %s (%s)\n",
              path, name, long_name, short_buf ? short_buf : "***");
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    }
    else
        WARN("'%s' not found in '%s'\n", name, path);
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    DOSFS_CloseDir( dir );
    return ret;
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}


/***********************************************************************
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 *           DOSFS_GetDevice
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 *
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 * Check if a DOS file name represents a DOS device and return the device.
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 */
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const DOS_DEVICE *DOSFS_GetDevice( const char *name )
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{
    int	i;
    const char *p;

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    if (!name) return NULL; /* if FILE_DupUnixHandle was used */
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    if (name[0] && (name[1] == ':')) name += 2;
    if ((p = strrchr( name, '/' ))) name = p + 1;
    if ((p = strrchr( name, '\\' ))) name = p + 1;
    for (i = 0; i < sizeof(DOSFS_Devices)/sizeof(DOSFS_Devices[0]); i++)
    {
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        const char *dev = DOSFS_Devices[i].name;
        if (!FILE_strncasecmp( dev, name, strlen(dev) ))
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        {
            p = name + strlen( dev );
            if (!*p || (*p == '.') || (*p == ':')) return &DOSFS_Devices[i];
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    return NULL;

/***********************************************************************
 *           DOSFS_GetDeviceByHandle
 */
const DOS_DEVICE *DOSFS_GetDeviceByHandle( HFILE hFile )
        if (!SERVER_CALL() && (req->type == FILE_TYPE_UNKNOWN))
        {
            if ((req->attr >= 0) &&
                (req->attr < sizeof(DOSFS_Devices)/sizeof(DOSFS_Devices[0])))
                ret = &DOSFS_Devices[req->attr];
        }
/**************************************************************************
 *         DOSFS_CreateCommPort
 */
static HANDLE DOSFS_CreateCommPort(LPCSTR name, DWORD access, DWORD attributes, LPSECURITY_ATTRIBUTES sa)
    char devname[40];
    TRACE_(file)("%s %lx %lx\n", name, access, attributes);

    PROFILE_GetWineIniString("serialports",name,"",devname,sizeof devname);
    if(!devname[0])
        return 0;

    TRACE("opening %s as %s\n", devname, name);

    len = strlen(devname);
    SERVER_START_VAR_REQ( create_serial, len )
        req->inherit = (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle);
        req->attributes = attributes;
        req->sharing = FILE_SHARE_READ|FILE_SHARE_WRITE;
        memcpy( server_data_ptr(req), devname, len );
        SetLastError(0);
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        ERR("Couldn't open device '%s' ! (check permissions)\n",devname);
    else
        TRACE("return %08X\n", ret );
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/***********************************************************************
 *           DOSFS_OpenDevice
 *
 * Open a DOS device. This might not map 1:1 into the UNIX device concept.
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 */
HANDLE DOSFS_OpenDevice( const char *name, DWORD access, DWORD attributes, LPSECURITY_ATTRIBUTES sa )
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{
    int i;
    const char *p;
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    if (name[0] && (name[1] == ':')) name += 2;
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    if ((p = strrchr( name, '/' ))) name = p + 1;
    if ((p = strrchr( name, '\\' ))) name = p + 1;
    for (i = 0; i < sizeof(DOSFS_Devices)/sizeof(DOSFS_Devices[0]); i++)
    {
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        const char *dev = DOSFS_Devices[i].name;
        if (!FILE_strncasecmp( dev, name, strlen(dev) ))
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        {
            p = name + strlen( dev );
            if (!*p || (*p == '.') || (*p == ':')) {
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	    	/* got it */
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		if (!strcmp(DOSFS_Devices[i].name,"NUL"))
                    return FILE_CreateFile( "/dev/null", access,
                                            FILE_SHARE_READ|FILE_SHARE_WRITE, sa,
                                            OPEN_EXISTING, 0, 0, TRUE, DRIVE_UNKNOWN );
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		if (!strcmp(DOSFS_Devices[i].name,"CON")) {
			switch (access & (GENERIC_READ|GENERIC_WRITE)) {
			case GENERIC_READ:
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				to_dup = GetStdHandle( STD_INPUT_HANDLE );
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				break;
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				to_dup = GetStdHandle( STD_OUTPUT_HANDLE );
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				break;
			default:
				FIXME("can't open CON read/write\n");
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			}
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			if (!DuplicateHandle( GetCurrentProcess(), to_dup, GetCurrentProcess(),
					      &handle, 0, 
					      sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle, 
					      DUPLICATE_SAME_ACCESS ))
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			return handle;
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		}
		if (!strcmp(DOSFS_Devices[i].name,"SCSIMGR$") ||
                    !strcmp(DOSFS_Devices[i].name,"HPSCAN"))
                {
                    return FILE_CreateDevice( i, access, sa );
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		}
                if( (handle=DOSFS_CreateCommPort(DOSFS_Devices[i].name,access,attributes,sa)) )
                FIXME("device open %s not supported (yet)\n",DOSFS_Devices[i].name);
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	    }
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        }
    }
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/***********************************************************************
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 *           DOSFS_GetPathDrive
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 *
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 * Get the drive specified by a given path name (DOS or Unix format).
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 */
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static int DOSFS_GetPathDrive( const char **name )
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{
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    int drive;
    const char *p = *name;
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    if (*p && (p[1] == ':'))
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    {
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        *name += 2;
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    }
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    else if (*p == '/') /* Absolute Unix path? */
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    {
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        if ((drive = DRIVE_FindDriveRoot( name )) == -1)
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        {
            MESSAGE("Warning: %s not accessible from a configured DOS drive\n", *name );
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            /* Assume it really was a DOS name */
            drive = DRIVE_GetCurrentDrive();            
        }
    }
    else drive = DRIVE_GetCurrentDrive();

    if (!DRIVE_IsValid(drive))
    {
        SetLastError( ERROR_INVALID_DRIVE );
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        return -1;
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    }
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    return drive;
}


/***********************************************************************
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 *           DOSFS_GetFullName
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 *
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 * Convert a file name (DOS or mixed DOS/Unix format) to a valid
 * Unix name / short DOS name pair.
 * Return FALSE if one of the path components does not exist. The last path
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 * component is only checked if 'check_last' is non-zero.
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 * The buffers pointed to by 'long_buf' and 'short_buf' must be
 * at least MAX_PATHNAME_LEN long.
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 */
BOOL DOSFS_GetFullName( LPCSTR name, BOOL check_last, DOS_FULL_NAME *full )
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{
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    char *p_l, *p_s, *root;

    TRACE("%s (last=%d)\n", name, check_last );
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    if ((!*name) || (*name=='\n'))
    { /* error code for Win98 */
        SetLastError(ERROR_BAD_PATHNAME);
        return FALSE;
    }

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    if ((full->drive = DOSFS_GetPathDrive( &name )) == -1) return FALSE;
    flags = DRIVE_GetFlags( full->drive );
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    lstrcpynA( full->long_name, DRIVE_GetRoot( full->drive ),
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                 sizeof(full->long_name) );
    if (full->long_name[1]) root = full->long_name + strlen(full->long_name);
    else root = full->long_name;  /* root directory */
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    strcpy( full->short_name, "A:\\" );
    full->short_name[0] += full->drive;
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    if ((*name == '\\') || (*name == '/'))  /* Absolute path */
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    {
        while ((*name == '\\') || (*name == '/')) name++;
    }
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    else  /* Relative path */
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    {
        lstrcpynA( root + 1, DRIVE_GetUnixCwd( full->drive ),
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                     sizeof(full->long_name) - (root - full->long_name) - 1 );
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        if (root[1]) *root = '/';
        lstrcpynA( full->short_name + 3, DRIVE_GetDosCwd( full->drive ),
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                     sizeof(full->short_name) - 3 );
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    p_l = full->long_name[1] ? full->long_name + strlen(full->long_name)
                             : full->long_name;
    p_s = full->short_name[3] ? full->short_name + strlen(full->short_name)
                              : full->short_name + 2;
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    found = TRUE;
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    while (*name && found)
    {
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        /* Check for '.' and '..' */

        if (*name == '.')
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        {
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            if (IS_END_OF_NAME(name[1]))
            {
                name++;
                while ((*name == '\\') || (*name == '/')) name++;
                continue;
            }
            else if ((name[1] == '.') && IS_END_OF_NAME(name[2]))
            {
                name += 2;
                while ((*name == '\\') || (*name == '/')) name++;
                while ((p_l > root) && (*p_l != '/')) p_l--;
                while ((p_s > full->short_name + 2) && (*p_s != '\\')) p_s--;
                *p_l = *p_s = '\0';  /* Remove trailing separator */
                continue;
            }
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        }
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        /* Make sure buffers are large enough */

        if ((p_s >= full->short_name + sizeof(full->short_name) - 14) ||
            (p_l >= full->long_name + sizeof(full->long_name) - 1))
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        {
            SetLastError( ERROR_PATH_NOT_FOUND );
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            return FALSE;
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        }
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        /* Get the long and short name matching the file name */

        if ((found = DOSFS_FindUnixName( full->long_name, name, p_l + 1,
                         sizeof(full->long_name) - (p_l - full->long_name) - 1,
                         p_s + 1, !(flags & DRIVE_CASE_SENSITIVE) )))
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        {
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            *p_l++ = '/';
            p_l   += strlen(p_l);
            *p_s++ = '\\';
            p_s   += strlen(p_s);
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            while (!IS_END_OF_NAME(*name)) name++;
        }
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        else if (!check_last)
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        {
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            *p_l++ = '/';
            *p_s++ = '\\';
            while (!IS_END_OF_NAME(*name) &&
                   (p_s < full->short_name + sizeof(full->short_name) - 1) &&
                   (p_l < full->long_name + sizeof(full->long_name) - 1))
            {
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                /* If the drive is case-sensitive we want to create new */
                /* files in lower-case otherwise we can't reopen them   */
                /* under the same short name. */
	    	if (flags & DRIVE_CASE_SENSITIVE) *p_l++ = FILE_tolower(*name);
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		else *p_l++ = *name;
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                name++;
            }
	    /* Ignore trailing dots and spaces */
	    while(p_l[-1] == '.' || p_l[-1] == ' ') {
		--p_l;
		--p_s;
	    }
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            *p_l = *p_s = '\0';
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        }
        while ((*name == '\\') || (*name == '/')) name++;
    }
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    if (!found)
    {
        if (check_last)
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        {
            SetLastError( ERROR_FILE_NOT_FOUND );
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            return FALSE;
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        }
        if (*name)  /* Not last */
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        {
            SetLastError( ERROR_PATH_NOT_FOUND );
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            return FALSE;
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        }
    }
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    if (!full->long_name[0]) strcpy( full->long_name, "/" );
    if (!full->short_name[2]) strcpy( full->short_name + 2, "\\" );
    TRACE("returning %s = %s\n", full->long_name, full->short_name );
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    return TRUE;
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}


/***********************************************************************
 *           GetShortPathNameA   (KERNEL32.@)
 *
 * NOTES
 *  observed:
 *  longpath=NULL: LastError=ERROR_INVALID_PARAMETER, ret=0
 *  longpath="" or invalid: LastError=ERROR_BAD_PATHNAME, ret=0
 * 
 * more observations ( with NT 3.51 (WinDD) ):
 * longpath <= 8.3 -> just copy longpath to shortpath
 * longpath > 8.3  -> 
 *             a) file does not exist -> return 0, LastError = ERROR_FILE_NOT_FOUND
 *             b) file does exist     -> set the short filename.
 * - trailing slashes are reproduced in the short name, even if the
 *   file is not a directory