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freebsd/usr.bin/doscmd/intff.c
Jonathan Lemon daf3ece326 Add support for EMS emulation to doscmd. This requires changing the 
interface for callbacks to doscmd from DOS, obsoleting the instbsdi
redirector.  (redir.com replaces it)

A temporary hack is in place so the instbsdi program will (hopefully) work
in the short term.
Submitted by:	Helmut F. Wirth <hfwirth@ping.at>
1997-09-30 22:04:06 +00:00

806 lines
19 KiB
C
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/*
* Copyright (c) 1992, 1993, 1996
* Berkeley Software Design, Inc. All rights reserved.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Berkeley Software
* Design, Inc.
*
* THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``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 Berkeley Software Design, Inc. 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.
*
* BSDI intff.c,v 2.2 1996/04/08 19:32:56 bostic Exp
*
* $Id: intff.c,v 1.1 1997/08/09 01:42:51 dyson Exp $
*/
#include "doscmd.h"
#include <sys/param.h>
#include <ctype.h>
#include "dispatch.h"
static LOL *lol = 0; /* DOS list-of-lists */
static SDA *sda = 0; /* DOS swappable data area */
/******************************************************************************
** redirector functions
**
**
** These are set up on entry to the redirector each time, and are referenced
** by the functions here.
*/
static int r_drive,n_drive = 0;
static CDS *r_cds;
static SFT *r_sft;
/*
** 2f:11:0
**
** Installation check
*/
static int
int2f11_00(regcontext_t *REGS)
{
R_AL = 0xff;
R_AH = 'U'; /* and why not? 8) */
return(0);
}
/*
** 2f:11:1 2f:11:2 2f:11:3 2f:11:4 2f:11:5 2f:11:11 2f:11:13
**
** Directory functions
*/
static int
int2f11_dirfn(regcontext_t *REGS)
{
char fname[PATH_MAX], tname[PATH_MAX];
int error;
error = translate_filename(sda->filename1, fname, &r_drive);
if (error)
return(error);
if (dos_readonly(r_drive) && (R_AL != 0x05))
return(WRITE_PROT_DISK);
switch(R_AL) {
case 0x01: /* rmdir */
case 0x02:
debug(D_REDIR,"rmdir(%s)\n",fname);
error = rmdir(fname);
break;
case 0x03: /* mkdir */
case 0x04:
debug(D_REDIR,"mkdir(%s)\n",fname);
error = mkdir(fname,0777);
break;
case 0x05: /* chdir */
debug(D_REDIR,"chdir(%s)\n",fname);
/* Note returns DOS error directly */
return(dos_setcwd(sda->filename1));
case 0x11: /* rename */
error = translate_filename(sda->filename2, tname, &r_drive);
if (!error) {
debug(D_REDIR,"rename(%s,%s)\n",fname,tname);
error = rename(fname, tname);
}
break;
case 0x13: /* unlink */
debug(D_REDIR,"unlink(%s)\n",fname);
error = unlink(fname);
break;
default:
fatal("called int2f11_dirfn on unknown function %x\n",R_AL);
}
if (error < 0) {
switch(errno) {
case ENOTDIR:
case ENOENT:
return(PATH_NOT_FOUND);
case EXDEV:
return(NOT_SAME_DEV);
default:
return(ACCESS_DENIED);
}
}
return(0);
}
/*
** 2f:11:6
**
** Close
*/
static int
int2f11_close(regcontext_t *REGS)
{
int fd;
fd = r_sft->fd;
debug(D_REDIR, "close(%d)\n", fd);
r_sft->nfiles--;
if (r_sft->nfiles) {
debug(D_REDIR, "not last close\n");
return(0);
}
if (close(fd) < 0)
return(HANDLE_INVALID);
return(0);
}
/*
** 2f:11:8 2f:11:9
**
** read/write
*/
static int
int2f11_rdwr(regcontext_t *REGS)
{
int fd;
char *addr;
int nbytes;
int n;
fd = r_sft->fd;
if (lseek(fd, r_sft->offset, SEEK_SET) < 0)
return(SEEK_ERROR);
addr = (char *)MAKEPTR(sda->dta_seg, sda->dta_off);
nbytes = R_CX;
switch(R_AL) {
case 0x08: /* read */
debug(D_REDIR, "read(%d, %d)\n", fd, nbytes);
n = read(fd, addr, nbytes);
if (n < 0)
return(READ_FAULT);
break;
case 0x09:
debug(D_REDIR, "write(%d, %d)\n", fd, nbytes);
n = write(fd, addr, nbytes);
if (n < 0)
return(WRITE_FAULT);
break;
default:
fatal("called int2f11_rdwr on unknown function %x\n",R_AL);
}
R_CX = n; /* report count */
r_sft->offset += n;
if (r_sft->offset > r_sft->size)
r_sft->size = r_sft->offset;
debug(D_REDIR, "offset now %d\n", r_sft->offset);
return(0);
}
/*
** 2f:11:c
**
** Get free space (like 21:36)
*/
static int
int2f11_free(regcontext_t *REGS)
{
fsstat_t fs;
int error;
error = get_space(r_drive, &fs);
if (error)
return (error);
R_AX = fs.sectors_cluster;
R_BX = fs.total_clusters;
R_CX = fs.bytes_sector;
R_DX = fs.avail_clusters;
return(0);
}
/*
** 2f:11:f
**
** get size and mode
*/
static int
int2f11_stat(regcontext_t *REGS)
{
char fname[PATH_MAX];
struct stat sb;
int error;
error = translate_filename(sda->filename1, fname, &r_drive);
if (error)
return(error);
if (stat(fname, &sb) < 0)
return(FILE_NOT_FOUND);
R_AX = to_dos_attr(sb.st_mode);
R_BX = sb.st_size >> 16;
R_DI = sb.st_size & 0xffff;
return(0);
}
/*
** 2f:11:16 2f:11:17 2f:11:18 2f:11:2e
**
** Open/create a file, closely resembles int21_open.
*/
static int
int2f11_open(regcontext_t *REGS)
{
char fname[PATH_MAX];
struct stat sb;
int error;
int mode; /* open mode */
int attr; /* attributes of created file */
int action; /* what to do about file */
u_char *p, *e;
int i;
int omode; /* mode to say we opened in */
int status;
int fd;
error = translate_filename(sda->filename1, fname, &r_drive);
if (error)
return(error);
/*
** get attributes/access mode off stack : low byte is attribute, high
** byte is (sometimes) used in conjunction with 'action'
*/
attr = *(u_short *)N_GETPTR(R_SS, R_SP) & 0xff;
/* which style? */
switch(R_AL) {
case 0x16: /* open */
action = 0x01; /* fail if does not exist */
switch (sda->open_mode & 3) {
case 0:
mode = O_RDONLY;
break;
case 1:
mode = O_WRONLY;
break;
case 2:
mode = O_RDWR;
break;
default:
return (FUNC_NUM_IVALID);
}
omode = sda->open_mode & 0x7f;
debug(D_REDIR,"open");
break;
case 0x17: /* creat/creat new */
case 0x18: /* creat/creat new (no CDS, but we don't care)*/
mode = O_RDWR;
omode = 3;
if (attr & 0x100) { /* creat new */
action = 0x10; /* create if not exist, fail if exists */
debug(D_REDIR, "creat_new");
} else { /* creat */
action = 0x12; /* create and destroy */
debug(D_REDIR, "creat");
}
break;
case 0x2e: /* multipurpose */
attr = sda->ext_attr;
action = sda->ext_action;
switch (sda->ext_mode & 3) {
case 0:
mode = O_RDONLY;
break;
case 1:
mode = O_WRONLY;
break;
case 2:
mode = O_RDWR;
break;
default:
return (FUNC_NUM_IVALID);
}
omode = sda->ext_mode & 0x7f;
debug(D_REDIR,"mopen");
break;
default:
fatal("called int2f11_open for unknown function %x\n",R_AL);
}
if (action & 0x02) /* replace/open mode */
mode |= O_TRUNC;
debug(D_REDIR, "(%s) action 0x%x mode 0x%x attr 0x%x omode 0x%x \n",
fname, action, mode, attr, omode);
if (ustat(fname, &sb) < 0) { /* file does not exist */
if ((action & 0x10) || (attr & 0x100)) { /* create it */
sb.st_ino = 0;
mode |= O_CREAT; /* have to create as we go */
status = 0x02; /* file created */
} else {
return(FILE_NOT_FOUND); /* fail */
}
} else {
if (S_ISDIR(sb.st_mode))
return(ACCESS_DENIED);
if ((action & 0x03) && !(attr & 0x100)) { /* exists, work with it */
if (action & 0x02) {
if (!S_ISREG(sb.st_mode)) { /* only allowed for files */
debug(D_FILE_OPS,"attempt to truncate non-regular file\n");
return(ACCESS_DENIED);
}
status = 0x03; /* we're going to truncate it */
} else {
status = 0x01; /* just open it */
}
} else {
return(FILE_ALREADY_EXISTS); /* exists, fail */
}
}
if ((fd = open(fname, mode, from_dos_attr(attr))) < 0) {
debug(D_FILE_OPS,"failed to open %s : %s\n",fname,strerror(errno));
return (ACCESS_DENIED);
}
if (R_AL == 0x2e) /* extended wants status returned */
R_CX = status;
/* black magic to populate the SFT */
e = p = sda->filename1 + 2; /* parse name */
while (*p) {
if (*p++ == '\\') /* look for beginning of filename */
e = p;
}
for (i = 0; i < 8; ++i) { /* copy name and pad with spaces */
if (*e && *e != '.')
r_sft->name[i] = *e++;
else
r_sft->name[i] = ' ';
}
if (*e == '.') /* skip period on short names */
++e;
for (i = 0; i < 3; ++i) { /* copy extension and pad with spaces */
if (*e)
r_sft->ext[i] = *e++;
else
r_sft->ext[i] = ' ';
}
if (ustat(fname, &sb) < 0) /* re-stat to be accurate */
return(WRITE_FAULT); /* any better ideas?! */
r_sft->open_mode = omode; /* file open mode */
*(u_long *)r_sft->ddr_dpb = 0; /* no parameter block */
r_sft->size = sb.st_size; /* current size */
r_sft->fd = fd; /* our fd for it (hidden in starting cluster number) */
r_sft->offset = 0; /* current offset is 0 */
*(u_short *)r_sft->dir_sector = 0; /* not local file, ignored */
r_sft->dir_entry = 0; /* not local file, ignored */
r_sft->attribute = attr & 0xff; /* file attributes as requested */
r_sft->info = r_drive + 0x8040; /* hide drive number here for later reference */
encode_dos_file_time(sb.st_mtime, &r_sft->date, &r_sft->time);
debug(D_REDIR,"success, fd %d status %x\n", fd, status);
return(0);
}
/*
** 2f:11:19 2f:11:1b
**
** find first
*/
static int
int2f11_findfirst(regcontext_t *REGS)
{
return(find_first(sda->filename1,sda->attrmask,
(dosdir_t *)sda->foundentry,
(find_block_t *)sda->findfirst));
}
/*
** 2f:11:1c
**
** find next
*/
static int
int2f11_findnext(regcontext_t *REGS)
{
return(find_next((dosdir_t *)sda->foundentry,
(find_block_t *)sda->findfirst));
}
/*
** 2f:11:21
**
** lseek
*/
static int
int2f11_lseek(regcontext_t *REGS)
{
int fd;
off_t offset;
fd = r_sft->fd;
offset = (R_CX << 16) + R_DX;
debug(D_REDIR,"lseek(%d, 0x%qx, SEEK_END)\n", fd, offset);
if ((offset = lseek(fd, offset, SEEK_END)) < 0) {
if (errno == EBADF)
return(HANDLE_INVALID);
else
return(SEEK_ERROR);
}
r_sft->offset = offset; /* update offset in SFT */
R_DX = offset >> 16;
R_AX = offset;
return(0);
}
/*
** 2f:11:23
**
** qualify filename
*/
static int
int2f11_fnqual(regcontext_t *REGS)
{
char *fname,*tname;
int savedrive;
int error;
return(PATH_NOT_FOUND);
savedrive = diskdrive; /* to get CWD for network drive */
diskdrive = n_drive;
fname = (char *)N_GETPTR(R_DS, R_SI); /* path pointers */
tname = (char *)N_GETPTR(R_ES, R_DI);
error = dos_makepath(fname, tname);
if (error)
tname = "(failed)";
diskdrive = savedrive; /* restore correct drive */
debug(D_REDIR, "qualify '%s' -> '%s'\n", fname, tname);
return(error);
}
/*
** 2f:11:??
**
** Null function - we know about it but do nothing
*/
static int
int2f11_NULLFUNC(regcontext_t *REGS)
{
return(0);
}
/*
** 2f:11:??
**
** no function - not handled here (error)
*/
static int
int2f11_NOFUNC(regcontext_t *REGS)
{
return(-1);
}
struct intfunc_table int2f11_table[] = {
{ 0x00, IFT_NOSUBFUNC, int2f11_00, "installation check"},
{ 0x01, IFT_NOSUBFUNC, int2f11_dirfn, "rmdir"},
{ 0x02, IFT_NOSUBFUNC, int2f11_dirfn, "rmdir"},
{ 0x03, IFT_NOSUBFUNC, int2f11_dirfn, "mkdir"},
{ 0x04, IFT_NOSUBFUNC, int2f11_dirfn, "mkdir"},
{ 0x05, IFT_NOSUBFUNC, int2f11_dirfn, "chdir"},
{ 0x06, IFT_NOSUBFUNC, int2f11_close, "close"},
{ 0x07, IFT_NOSUBFUNC, int2f11_NULLFUNC, "commit file"},
{ 0x08, IFT_NOSUBFUNC, int2f11_rdwr, "read"},
{ 0x09, IFT_NOSUBFUNC, int2f11_rdwr, "write"},
{ 0x0a, IFT_NOSUBFUNC, int2f11_NULLFUNC, "lock region"},
{ 0x0b, IFT_NOSUBFUNC, int2f11_NULLFUNC, "unlock region"},
{ 0x0c, IFT_NOSUBFUNC, int2f11_free, "free space"},
{ 0x0e, IFT_NOSUBFUNC, int2f11_NULLFUNC, "chmod"},
{ 0x0f, IFT_NOSUBFUNC, int2f11_stat, "stat"},
{ 0x11, IFT_NOSUBFUNC, int2f11_dirfn, "rename"},
{ 0x13, IFT_NOSUBFUNC, int2f11_dirfn, "unlink"},
{ 0x16, IFT_NOSUBFUNC, int2f11_open, "open"},
{ 0x17, IFT_NOSUBFUNC, int2f11_open, "creat"},
{ 0x18, IFT_NOSUBFUNC, int2f11_open, "creat"},
{ 0x19, IFT_NOSUBFUNC, int2f11_findfirst, "find first"},
{ 0x1b, IFT_NOSUBFUNC, int2f11_findfirst, "find first"},
{ 0x1c, IFT_NOSUBFUNC, int2f11_findnext, "find next"},
{ 0x1d, IFT_NOSUBFUNC, int2f11_NULLFUNC, "close all (abort)"},
{ 0x1e, IFT_NOSUBFUNC, int2f11_NULLFUNC, "do redirection"},
{ 0x1f, IFT_NOSUBFUNC, int2f11_NULLFUNC, "printer setup"},
{ 0x20, IFT_NOSUBFUNC, int2f11_NULLFUNC, "flush all buffers"},
{ 0x21, IFT_NOSUBFUNC, int2f11_lseek, "lseek"},
{ 0x22, IFT_NOSUBFUNC, int2f11_NULLFUNC, "process terminated"},
{ 0x23, IFT_NOSUBFUNC, int2f11_fnqual, "qualify filename"},
{ 0x24, IFT_NOSUBFUNC, int2f11_NOFUNC, "turn off printer"},
{ 0x25, IFT_NOSUBFUNC, int2f11_NOFUNC, "printer mode"},
{ 0x2d, IFT_NOSUBFUNC, int2f11_NOFUNC, "extended attributes"},
{ 0x2e, IFT_NOSUBFUNC, int2f11_open, "extended open/create"},
{ -1, 0, NULL, NULL}
};
static int int2f11_fastlookup[256];
/******************************************************************************
** 2f:11
**
** The DOS redirector interface.
*/
/*
** Verify that the drive being referenced is one we are handling, and
** establish some state for upcoming functions.
**
** Returns 1 if we should handle this request.
**
** XXX this is rather inefficient, but much easier to read than the previous
** incarnation 8(
*/
static int
int2f11_validate(regcontext_t *REGS)
{
int func = R_AL;
char *path = NULL;
int doit = 0;
/* defaults may help trap problems */
r_cds = NULL;
r_sft = NULL;
r_drive = -1;
/* some functions we accept regardless */
switch (func) {
case 0x00: /* installation check */
case 0x23: /* qualify path */
case 0x1c: /* XXX really only valid if a search already started... */
return(1);
}
/* Where's the CDS? */
switch(func) {
case 0x01: /* referenced by the SDA */
case 0x02:
case 0x03:
case 0x04:
case 0x05:
case 0x0e:
case 0x0f:
case 0x11:
case 0x13:
case 0x17:
case 0x1b:
r_cds = (CDS *)MAKEPTR(sda->cds_seg, sda->cds_off);
break;
case 0x0c: /* in es:di */
case 0x1c:
r_cds = (CDS *)N_GETPTR(R_ES, R_DI);
break;
}
/* Where's the SFT? */
switch(func) {
case 0x06: /* in es:di */
case 0x07:
case 0x08:
case 0x09:
case 0x0a:
case 0x0b:
case 0x16:
case 0x17:
case 0x18:
case 0x21:
case 0x2d:
case 0x2e:
r_sft = (SFT *)N_GETPTR(R_ES, R_DI);
break;
}
/* What drive? */
switch(func) {
case 0x01: /* get drive from fully-qualified path in SDA */
case 0x02:
case 0x03:
case 0x04:
case 0x05:
case 0x0c:
case 0x0e:
case 0x0f:
case 0x11:
case 0x13:
case 0x16:
case 0x17:
case 0x18:
case 0x19:
case 0x1b:
case 0x2e:
path = sda->filename1;
break;
case 0x06: /* get drive from SFT (we put it here when file was opened) */
case 0x07:
case 0x08:
case 0x09:
case 0x0a:
case 0x0b:
case 0x21:
case 0x2d:
r_drive = r_sft->info & 0x1f;
break;
}
if (path) { /* we have a path and need to determine the drive it refers to */
if (path[1] != ':') { /* must be fully qualified; we cannot handle this */
debug(D_REDIR,"attempt to work non-absolute path %s\n",path);
return(0);
}
/* translate letter to drive number */
r_drive = toupper(path[0]) - 'A';
} else {
path = "(no path)";
}
/* do we handle this drive? */
if (dos_getcwd(r_drive)) {
n_drive = r_drive; /* XXX GROSTIC HACK ALERT */
doit = 1;
}
debug(D_REDIR,"%s -> drive %c func %x (%sus)\n",
path, 'A'+r_drive, func, doit?"":"not ");
/* so do we deal with this one? */
return(doit);
}
int
int2f_11(regcontext_t *REGS)
{
int index;
int error;
char *fname;
if (!sda) { /* not initialised yet */
error = FUNC_NUM_IVALID;
} else {
index = intfunc_find(int2f11_table, int2f11_fastlookup, R_AL, 0);
if (index == -1) {
debug(D_ALWAYS,"no handler for int2f:11:%x\n", R_AL);
return(0);
}
reset_poll();
if (!int2f11_validate(REGS)) { /* determine whether we handle this request */
error = -1; /* not handled by us */
} else {
debug(D_REDIR, "REDIR: %02x (%s)\n",
int2f11_table[index].func, int2f11_table[index].desc);
/* call the handler */
error = int2f11_table[index].handler(REGS);
if (error != -1)
debug(D_REDIR, "REDIR: returns %d (%s)\n",
error, ((error >= 0) && (error <= dos_ret_size)) ? dos_return[error] : "unknown");
}
}
if (error == -1)
return (0);
if (error) {
R_AX = error;
R_FLAGS |= PSL_C;
} else
R_FLAGS &= ~PSL_C;
return (1);
}
/******************************************************************************
** intff handler.
**
** intff is the (secret, proprietary, internal, evil) call to
** initialise the redirector.
*/
static void
install_drive(int drive, u_char *path)
{
CDS *cds;
/* check that DOS considers this a valid drive */
if (drive < 0 || drive >= lol->lastdrive) {
debug(D_REDIR, "Drive %c beyond limit of %c)\n",
drive + 'A', lol->lastdrive - 1 + 'A');
return;
}
/* get the CDS for this drive */
cds = (CDS *)MAKEPTR(lol->cds_seg, lol->cds_offset);
cds += drive;
#if 0 /* XXX looks OK to me - mjs */
if (cds->flag & (CDS_remote | CDS_ready)) {
debug(D_REDIR, "Drive %c already installed\n", drive + 'A');
return;
}
#endif
debug(D_REDIR, "Installing %c: as %s\n", drive + 'A', path);
cds->flag |= CDS_remote | CDS_ready | CDS_notnet;
cds->path[0] = drive + 'A';
cds->path[1] = ':';
cds->path[2] = '\\';
cds->path[3] = '\0';
cds->offset = 2; /* offset of \ in current path field */
}
static void
init_drives(void)
{
int drive;
u_char *path;
/* for all possible drives */
for (drive = 0; drive < 26; ++drive) {
if (path = dos_getpath(drive)) /* assigned to a path? */
install_drive(drive, path); /* make it visible to DOS */
}
}
void
intff(regcontext_t *REGS)
{
if (lol && sda) { /* already been called? */
debug(D_REDIR, "redirector duplicate install ignored\n");
return;
}
lol = (LOL *)N_GETPTR(R_BX, R_DX); /* where DOS keeps its goodies */
sda = (SDA *)N_GETPTR(R_DI, R_SI);
init_drives();
/* initialise dispatcher */
intfunc_init(int2f11_table, int2f11_fastlookup);
}
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