usr.bin/doscmd/dos.h

   1 /*
   2  * Copyright (c) 1992, 1993, 1996
   3  *      Berkeley Software Design, Inc.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Berkeley Software
  16  *      Design, Inc.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  *
  30  *      BSDI dos.h,v 2.2 1996/04/08 19:32:28 bostic Exp
  31  *
  32  * $FreeBSD: src/usr.bin/doscmd/dos.h,v 1.2.2.1 2002/04/25 11:04:51 tg Exp $
  33  * $DragonFly: src/usr.bin/doscmd/dos.h,v 1.2 2003/06/17 04:29:25 dillon Exp $
  34  */
  35
  36 /*
  37  * DOS Error codes
  38  */
  39 /* MS-DOS version 2 error codes */
  40 #define FUNC_NUM_IVALID         0x01
  41 #define FILE_NOT_FOUND          0x02
  42 #define PATH_NOT_FOUND          0x03
  43 #define TOO_MANY_OPEN_FILES     0x04
  44 #define ACCESS_DENIED           0x05
  45 #define HANDLE_INVALID          0x06
  46 #define MEM_CB_DEST             0x07
  47 #define INSUF_MEM               0x08
  48 #define MEM_BLK_ADDR_IVALID     0x09
  49 #define ENV_INVALID             0x0a
  50 #define FORMAT_INVALID          0x0b
  51 #define ACCESS_CODE_INVALID     0x0c
  52 #define DATA_INVALID            0x0d
  53 #define UNKNOWN_UNIT            0x0e
  54 #define DISK_DRIVE_INVALID      0x0f
  55 #define ATT_REM_CUR_DIR         0x10
  56 #define NOT_SAME_DEV            0x11
  57 #define NO_MORE_FILES           0x12
  58 /* mappings to critical-error codes */
  59 #define WRITE_PROT_DISK         0x13
  60 #define UNKNOWN_UNIT_CERR       0x14
  61 #define DRIVE_NOT_READY         0x15
  62 #define UNKNOWN_COMMAND         0x16
  63 #define DATA_ERROR_CRC          0x17
  64 #define BAD_REQ_STRUCT_LEN      0x18
  65 #define SEEK_ERROR              0x19
  66 #define UNKNOWN_MEDIA_TYPE      0x1a
  67 #define SECTOR_NOT_FOUND        0x1b
  68 #define PRINTER_OUT_OF_PAPER    0x1c
  69 #define WRITE_FAULT             0x1d
  70 #define READ_FAULT              0x1e
  71 #define GENERAL_FAILURE         0x1f
  72
  73 /* MS-DOS version 3 and later extended error codes */
  74 #define SHARING_VIOLATION       0x20
  75 #define FILE_LOCK_VIOLATION     0x21
  76 #define DISK_CHANGE_INVALID     0x22
  77 #define FCB_UNAVAILABLE         0x23
  78 #define SHARING_BUF_EXCEEDED    0x24
  79
  80 #define NETWORK_NAME_NOT_FOUND  0x35
  81
  82 #define FILE_ALREADY_EXISTS     0x50
  83
  84 #define DUPLICATE_REDIR         0x55
  85
  86 /*
  87  * dos attribute byte flags
  88  */
  89 #define REGULAR_FILE    0x00
  90 #define READ_ONLY_FILE  0x01
  91 #define HIDDEN_FILE     0x02
  92 #define SYSTEM_FILE     0x04
  93 #define VOLUME_LABEL    0x08
  94 #define DIRECTORY       0x10
  95 #define ARCHIVE_NEEDED  0x20
  96
  97 /*
  98  * Internal structure used for get_space()
  99  */
 100 typedef struct {
 101     long        bytes_sector;
 102     long        sectors_cluster;
 103     long        total_clusters;
 104     long        avail_clusters;
 105 } fsstat_t;
 106
 107 /*
 108  * Several DOS structures used by the file redirector
 109  */
 110
 111 typedef struct {
 112     DIR         *dp;
 113     u_char      *searchend;
 114     u_char      searchdir[1024];
 115 } search_t;
 116
 117 /*
 118  * This is really the format of the DTA.  The file redirector will only
 119  * use the first 21 bytes.
 120  */
 121 typedef struct {
 122     u_char      drive           __attribute__ ((packed));
 123     u_char      pattern[11]     __attribute__ ((packed));
 124     u_char      flag            __attribute__ ((packed));
 125     u_char      reserved1[4]    __attribute__ ((packed));
 126     search_t    *searchptr      __attribute__ ((packed));
 127     u_char      attr            __attribute__ ((packed));
 128     u_short     time            __attribute__ ((packed));
 129     u_short     date            __attribute__ ((packed));
 130     u_long      size            __attribute__ ((packed));
 131     u_char      name[13]        __attribute__ ((packed));
 132 }/*  __attribute__((__packed__))*/ find_block_t;
 133
 134 /*
 135  * DOS directory entry structure
 136  */
 137 typedef struct {
 138     u_char      name[8]         __attribute__ ((packed));
 139     u_char      ext[3]          __attribute__ ((packed));
 140     u_char      attr            __attribute__ ((packed));
 141     u_char      reserved[10]    __attribute__ ((packed));
 142     u_short     time            __attribute__ ((packed));
 143     u_short     date            __attribute__ ((packed));
 144     u_short     start           __attribute__ ((packed));
 145     u_long      size            __attribute__ ((packed));
 146 } dosdir_t;
 147
 148 /*
 149  * The Current Drive Structure
 150  */
 151 typedef struct {
 152         u_char  path[0x43]              __attribute__ ((packed));
 153         u_short flag                    __attribute__ ((packed));
 154         u_short dpb_off                 __attribute__ ((packed));
 155         u_short dpb_seg                 __attribute__ ((packed));
 156         u_short redirector_off          __attribute__ ((packed));
 157         u_short redirector_seg          __attribute__ ((packed));
 158         u_char  paramter_int21[2]       __attribute__ ((packed));
 159         u_short offset                  __attribute__ ((packed));
 160         u_char  dummy                   __attribute__ ((packed));
 161         u_char  ifs_driver[4]           __attribute__ ((packed));
 162         u_char  dummy2[2]               __attribute__ ((packed));
 163 }/* __attribute__((__packed__))*/ CDS;
 164
 165 #define CDS_remote      0x8000
 166 #define CDS_ready       0x4000
 167 #define CDS_joined      0x2000
 168 #define CDS_substed     0x1000
 169
 170 #define CDS_notnet      0x0080
 171
 172 /*
 173  * The List of Lists (used to get the CDS and a few other numbers)
 174  */
 175 typedef struct {
 176         u_char  dummy1[0x16]    __attribute__ ((packed));
 177         u_short cds_offset      __attribute__ ((packed));
 178         u_short cds_seg         __attribute__ ((packed));
 179         u_char  dummy2[6]       __attribute__ ((packed));
 180         u_char  numberbdev      __attribute__ ((packed));
 181         u_char  lastdrive       __attribute__ ((packed));
 182 } LOL;
 183
 184 /*
 185  * The System File Table
 186  */
 187 typedef struct {
 188 /*00*/  u_short nfiles          __attribute__ ((packed));       /* Number file handles referring to this file */
 189 /*02*/  u_short open_mode       __attribute__ ((packed));       /* Open mode (bit 15 -> by FCB) */
 190 /*04*/  u_char  attribute       __attribute__ ((packed));
 191 /*05*/  u_short info            __attribute__ ((packed));       /* 15 -> remote, 14 ->  dont set date */
 192 /*07*/  u_char  ddr_dpb[4]      __attribute__ ((packed));       /* Device Driver Header/Drive Paramter Block */
 193 /*0b*/  u_short fd              __attribute__ ((packed));
 194 /*0d*/  u_short time            __attribute__ ((packed));
 195 /*0f*/  u_short date            __attribute__ ((packed));
 196 /*11*/  u_long  size            __attribute__ ((packed));
 197 /*15*/  u_long  offset          __attribute__ ((packed));
 198 /*19*/  u_short rel_cluster     __attribute__ ((packed));
 199 /*1b*/  u_short abs_cluster     __attribute__ ((packed));
 200 /*1d*/  u_char  dir_sector[2]   __attribute__ ((packed));
 201 /*1f*/  u_char  dir_entry       __attribute__ ((packed));
 202 /*20*/  u_char  name[8]         __attribute__ ((packed));
 203 /*28*/  u_char  ext[3]          __attribute__ ((packed));
 204 /*2b*/  u_char  sharesft[4]     __attribute__ ((packed));
 205 /*2f*/  u_char  sharenet[2]     __attribute__ ((packed));
 206 /*31*/  u_short psp             __attribute__ ((packed));
 207 /*33*/  u_char  share_off[2]    __attribute__ ((packed));
 208 /*35*/  u_char  local_end[2]    __attribute__ ((packed));
 209 /*37*/  u_char  ifd_driver[4]   __attribute__ ((packed));
 210 } /*__attribute__((__packed__))*/ SFT;
 211
 212 /*
 213  * Format of PCDOS 4.01 swappable data area
 214  * (Sorry, but you need a wide screen to make this look nice)
 215  */
 216 typedef struct {
 217     u_char      err_crit        __attribute__ ((packed));       /*   00h    BYTE    critical error flag */
 218     u_char      InDOS           __attribute__ ((packed));       /*   01h    BYTE    InDOS flag (count of active INT 21 calls) */
 219     u_char      err_drive       __attribute__ ((packed));       /*   02h    BYTE    ??? drive number or FFh */
 220     u_char      err_locus       __attribute__ ((packed));       /*   03h    BYTE    locus of last error */
 221     u_short     err_code        __attribute__ ((packed));       /*   04h    WORD    extended error code of last error */
 222     u_char      err_suggest     __attribute__ ((packed));       /*   06h    BYTE    suggested action for last error */
 223     u_char      err_class       __attribute__ ((packed));       /*   07h    BYTE    class of last error */
 224     u_short     err_di          __attribute__ ((packed));
 225     u_short     err_es          __attribute__ ((packed));       /*   08h    DWORD   ES:DI pointer for last error */
 226     u_short     dta_off         __attribute__ ((packed));
 227     u_short     dta_seg         __attribute__ ((packed));       /*   0Ch    DWORD   current DTA */
 228     u_short     psp             __attribute__ ((packed));       /*   10h    WORD    current PSP */
 229     u_short     int_23_sp       __attribute__ ((packed));       /*   12h    WORD    stores SP across an INT 23 */
 230     u_short     wait_status     __attribute__ ((packed));       /*   14h    WORD    return code from last process termination (zerod after reading with AH=4Dh) */
 231     u_char      current_drive   __attribute__ ((packed));       /*   16h    BYTE    current drive */
 232     u_char      break_flag      __attribute__ ((packed));       /*   17h    BYTE    extended break flag */
 233     u_char      unknown1[2]     __attribute__ ((packed));       /*   18h  2 BYTEs   ??? */
 234     u_short     int_21_ax       __attribute__ ((packed));       /*   1Ah    WORD    value of AX on call to INT 21 */
 235     u_short     net_psp         __attribute__ ((packed));       /*   1Ch    WORD    PSP segment for sharing/network */
 236     u_short     net_number      __attribute__ ((packed));       /*   1Eh    WORD    network machine number for sharing/network (0000h = us) */
 237     u_short     first_mem       __attribute__ ((packed));       /*   20h    WORD    first usable memory block found when allocating memory */
 238     u_short     best_mem        __attribute__ ((packed));       /*   22h    WORD    best usable memory block found when allocating memory */
 239     u_short     last_mem        __attribute__ ((packed));       /*   24h    WORD    last usable memory block found when allocating memory */
 240     u_char      unknown[10]     __attribute__ ((packed));       /*   26h  2 BYTEs   ??? (don't seem to be referenced) */
 241     u_char      monthday        __attribute__ ((packed));       /*   30h    BYTE    day of month */
 242     u_char      month           __attribute__ ((packed));       /*   31h    BYTE    month */
 243     u_short     year            __attribute__ ((packed));       /*   32h    WORD    year - 1980 */
 244     u_short     days            __attribute__ ((packed));       /*   34h    WORD    number of days since 1-1-1980 */
 245     u_char      weekday         __attribute__ ((packed));       /*   36h    BYTE    day of week (0 = Sunday) */
 246     u_char      unknown2[3]     __attribute__ ((packed));       /*   37h    BYTE    ??? */
 247     u_char      ddr_head[30]    __attribute__ ((packed));       /*   38h 30 BYTEs   device driver request header */
 248     u_short     ddre_ip         __attribute__ ((packed));
 249     u_short     ddre_cs         __attribute__ ((packed));       /*   58h    DWORD   pointer to device driver entry point (used in calling driver) */
 250     u_char      ddr_head2[22]   __attribute__ ((packed));       /*   5Ch 22 BYTEs   device driver request header */
 251     u_char      ddr_head3[30]   __attribute__ ((packed));       /*   72h 30 BYTEs   device driver request header */
 252     u_char      unknown3[6]     __attribute__ ((packed));       /*   90h  6 BYTEs   ??? */
 253     u_char      clock_xfer[6]   __attribute__ ((packed));       /*   96h  6 BYTEs   CLOCK$ transfer record (see AH=52h) */
 254     u_char      unknown4[2]     __attribute__ ((packed));       /*   9Ch  2 BYTEs   ??? */
 255     u_char      filename1[128]  __attribute__ ((packed));       /*   9Eh 128 BYTEs  buffer for filename */
 256     u_char      filename2[128]  __attribute__ ((packed));       /*  11Eh 128 BYTEs  buffer for filename */
 257     u_char      findfirst[21]   __attribute__ ((packed));       /*  19Eh 21 BYTEs   findfirst/findnext search data block (see AH=4Eh) */
 258     u_char      foundentry[32]  __attribute__ ((packed));       /*  1B3h 32 BYTEs   directory entry for found file */
 259     u_char      cds[88]         __attribute__ ((packed));       /*  1D3h 88 BYTEs   copy of current directory structure for drive being accessed */
 260     u_char      fcbname[11]     __attribute__ ((packed));       /*  22Bh 11 BYTEs   ??? FCB-format filename */
 261     u_char      unknown5        __attribute__ ((packed));       /*  236h    BYTE    ??? */
 262     u_char      wildcard[11]    __attribute__ ((packed));       /*  237h 11 BYTEs   wildcard destination specification for rename (FCB format) */
 263     u_char      unknown6[11]    __attribute__ ((packed));       /*  242h  2 BYTEs   ??? */
 264     u_char      attrmask        __attribute__ ((packed));       /*  24Dh    BYTE    attribute mask for directory search??? */
 265     u_char      open_mode       __attribute__ ((packed));       /*  24Eh    BYTE    open mode */
 266     u_char      unknown7[3]     __attribute__ ((packed));       /*  24fh    BYTE    ??? */
 267     u_char      virtual_dos     __attribute__ ((packed));       /*  252h    BYTE    flag indicating how DOS function was invoked (00h = direct INT 20/INT 21, FFh = server call AX=5D00h) */
 268     u_char      unknown8[9]     __attribute__ ((packed));       /*  253h    BYTE    ??? */
 269     u_char      term_type       __attribute__ ((packed));       /*  25Ch    BYTE    type of process termination (00h-03h) */
 270     u_char      unknown9[3]     __attribute__ ((packed));       /*  25Dh    BYTE    ??? */
 271     u_short     dpb_off         __attribute__ ((packed));
 272     u_short     dpb_seg         __attribute__ ((packed));       /*  260h    DWORD   pointer to Drive Parameter Block for critical error invocation */
 273     u_short     int21_sf_off    __attribute__ ((packed));
 274     u_short     int21_sf_seg    __attribute__ ((packed));       /*  264h    DWORD   pointer to stack frame containing user registers on INT 21 */
 275     u_short     store_sp        __attribute__ ((packed));       /*  268h    WORD    stores SP??? */
 276     u_short     dosdpb_off      __attribute__ ((packed));
 277     u_short     dosdpb_seg      __attribute__ ((packed));       /*  26Ah    DWORD   pointer to DOS Drive Parameter Block for ??? */
 278     u_short     disk_buf_seg    __attribute__ ((packed));       /*  26Eh    WORD    segment of disk buffer */
 279     u_short     unknown10[4]    __attribute__ ((packed));       /*  270h    WORD    ??? */
 280     u_char      media_id        __attribute__ ((packed));       /*  278h    BYTE    Media ID byte returned by AH=1Bh,1Ch */
 281     u_char      unknown11       __attribute__ ((packed));       /*  279h    BYTE    ??? (doesn't seem to be referenced) */
 282     u_short     unknown12[2]    __attribute__ ((packed));       /*  27Ah    DWORD   pointer to ??? */
 283     u_short     sft_off         __attribute__ ((packed));
 284     u_short     sft_seg         __attribute__ ((packed));       /*  27Eh    DWORD   pointer to current SFT */
 285     u_short     cds_off         __attribute__ ((packed));
 286     u_short     cds_seg         __attribute__ ((packed));       /*  282h    DWORD   pointer to current directory structure for drive being accessed */
 287     u_short     fcb_off         __attribute__ ((packed));
 288     u_short     fcb_seg         __attribute__ ((packed));       /*  286h    DWORD   pointer to caller's FCB */
 289     u_short     unknown13[2]    __attribute__ ((packed));       /*  28Ah    WORD    ??? */
 290     u_short     jft_off         __attribute__ ((packed));
 291     u_short     jft_seg         __attribute__ ((packed));       /*  28Eh    DWORD   pointer to a JFT entry in process handle table (see AH=26h) */
 292     u_short     filename1_off   __attribute__ ((packed));       /*  292h    WORD    offset in DOS CS of first filename argument */
 293     u_short     filename2_off   __attribute__ ((packed));       /*  294h    WORD    offset in DOS CS of second filename argument */
 294     u_short     unknown14[12]   __attribute__ ((packed));       /*  296h    WORD    ??? */
 295     u_short     file_offset_lo  __attribute__ ((packed));
 296     u_short     file_offset_hi  __attribute__ ((packed));       /*  2AEh    DWORD   offset in file??? */
 297     u_short     unknown15       __attribute__ ((packed));       /*  2B2h    WORD    ??? */
 298     u_short     partial_bytes   __attribute__ ((packed));       /*  2B4h    WORD    bytes in partial sector */
 299     u_short     number_sectors  __attribute__ ((packed));       /*  2B6h    WORD    number of sectors */
 300     u_short     unknown16[3]    __attribute__ ((packed));       /*  2B8h    WORD    ??? */
 301     u_short     nbytes_lo       __attribute__ ((packed));
 302     u_short     nbytes_hi       __attribute__ ((packed));       /*  2BEh    DWORD   number of bytes appended to file */
 303     u_short     qpdb_off        __attribute__ ((packed));
 304     u_short     qpdb_seg        __attribute__ ((packed));       /*  2C2h    DWORD   pointer to ??? disk buffer */
 305     u_short     asft_off        __attribute__ ((packed));
 306     u_short     asft_seg        __attribute__ ((packed));       /*  2C6h    DWORD   pointer to ??? SFT */
 307     u_short     int21_bx        __attribute__ ((packed));       /*  2CAh    WORD    used by INT 21 dispatcher to store caller's BX */
 308     u_short     int21_ds        __attribute__ ((packed));       /*  2CCh    WORD    used by INT 21 dispatcher to store caller's DS */
 309     u_short     temporary       __attribute__ ((packed));       /*  2CEh    WORD    temporary storage while saving/restoring caller's registers */
 310     u_short     prevcall_off    __attribute__ ((packed));
 311     u_short     prevcall_seg    __attribute__ ((packed));       /*  2D0h    DWORD   pointer to prev call frame (offset 264h) if INT 21 reentered also switched to for duration of INT 24 */
 312     u_char      unknown17[9]    __attribute__ ((packed));       /*  2D4h    WORD    ??? */
 313     u_short     ext_action      __attribute__ ((packed));       /*  2DDh    WORD    multipurpose open action */
 314     u_short     ext_attr        __attribute__ ((packed));       /*  2DFh    WORD    multipurpose attribute */
 315     u_short     ext_mode        __attribute__ ((packed));       /*  2E1h    WORD    multipurpose mode */
 316     u_char      unknown17a[9]   __attribute__ ((packed));
 317     u_short     lol_ds          __attribute__ ((packed));       /*  2ECh    WORD    stores DS during call to [List-of-Lists + 37h] */
 318     u_char      unknown18[5]    __attribute__ ((packed));       /*  2EEh    WORD    ??? */
 319     u_char      usernameptr[4]  __attribute__ ((packed));       /*  2F3h    DWORD   pointer to user-supplied filename */
 320     u_char      unknown19[4]    __attribute__ ((packed));       /*  2F7h    DWORD   pointer to ??? */
 321     u_char      lol_ss[2]       __attribute__ ((packed));       /*  2FBh    WORD    stores SS during call to [List-of-Lists + 37h] */
 322     u_char      lol_sp[2]       __attribute__ ((packed));       /*  2FDh    WORD    stores SP during call to [List-of-Lists + 37h] */
 323     u_char      lol_flag        __attribute__ ((packed));       /*  2FFh    BYTE    flag, nonzero if stack switched in calling [List-of-Lists+37h] */
 324     u_char      searchdata[21]  __attribute__ ((packed));       /*  300h 21 BYTEs   FindFirst search data for source file(s) of a rename operation (see AH=4Eh) */
 325     u_char      renameentry[32] __attribute__ ((packed));       /*  315h 32 BYTEs   directory entry for file being renamed */
 326     u_char      errstack[331]   __attribute__ ((packed));       /*  335h 331 BYTEs  critical error stack */
 327     u_char      diskstack[384]  __attribute__ ((packed));       /*  480h 384 BYTEs  disk stack (functions greater than 0Ch, INT 25, INT 26) */
 328     u_char      iostack[384]    __attribute__ ((packed));       /*  600h 384 BYTEs  character I/O stack (functions 01h through 0Ch) */
 329     u_char      int_21_08_flag  __attribute__ ((packed));       /*  780h    BYTE    flag affecting AH=08h (see AH=64h) */
 330     u_char      unknown20[11]   __attribute__ ((packed));       /*  781h    BYTE    ??? looks like a drive number */
 331 } /*__attribute__((__packed__))*/ SDA;
 332
 333 struct exehdr {
 334         u_short magic;
 335         u_short bytes_on_last_page;
 336         u_short size; /* 512 byte blocks */
 337         u_short nreloc;
 338         u_short hdr_size; /* paragraphs */
 339         u_short min_memory; /* paragraphs */
 340         u_short max_memory; /* pargraphs */
 341         u_short init_ss;
 342         u_short init_sp;
 343         u_short checksum;
 344         u_short init_ip;
 345         u_short init_cs;
 346         u_short reloc_offset;
 347         u_short overlay_num;
 348 };
 349
 350 struct reloc_entry {
 351         u_short off;
 352         u_short seg;
 353 };
 354
 355
 356 /*
 357 ** DOS-related shrapnel
 358 */
 359
 360 static inline int
 361 from_dos_attr(int attr)
 362 {
 363     return((attr & READ_ONLY_FILE) ? 0444 : 0666);
 364 }
 365
 366 static inline int
 367 to_dos_attr(int mode)
 368 {
 369     int         attr;
 370
 371     attr = (mode & 0200) ? 0:READ_ONLY_FILE;
 372     attr |= S_ISDIR(mode) ? DIRECTORY:0;
 373     return(attr);
 374 }
 375
 376 /* prototypes */
 377
 378 extern const char       *dos_return[];  /* names of DOS return codes */
 379 extern const int        dos_ret_size;   /* length of above */
 380 extern char             *InDOS;
 381 extern int              diskdrive;      /* current drive */
 382 unsigned long           disk_transfer_addr;
 383
 384 extern void             encode_dos_file_time (time_t, u_short *, u_short *);
 385 extern time_t           decode_dos_file_time(u_short dosdate, u_short dostime);
 386 extern int              translate_filename(u_char *dname, u_char *uname, int *drivep);
 387 extern int              parse_filename(int flag, char *str, char *fcb, int *nb);
 388 extern void             dos_init(void);
 389
 390 /* from exe.c */
 391 extern int      pspseg;                 /* segment # of PSP */
 392 extern int      curpsp;
 393
 394 extern void     exec_command(regcontext_t *REGS, int run, int fd, char *cmdname, u_short *param);
 395 extern void     load_overlay(int fd, int start_segment, int reloc_segment);
 396 extern void     load_command(regcontext_t *REGS, int run, int fd, char *cmdname,
 397                              u_short *param, char **argv, char **envs);
 398 extern void     exec_return(regcontext_t *REGS, int code);
 399 extern int      get_env(void);