command.c 14.7 KB
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/* command.c
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 *
 * $Id$ */

/* lsh, an implementation of the ssh protocol
 *
 * Copyright (C) 1998 Niels Möller
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "command.h"

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#include "connection.h"
#include "io.h"
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#include "werror.h"
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#include "xalloc.h"

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#include <assert.h>

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#define GABA_DEFINE
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#include "command.h.x"
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#undef GABA_DEFINE
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#include "command.c.x"

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static void
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do_discard_continuation(struct command_continuation *ignored UNUSED,
			struct lsh_object *x UNUSED)
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{}
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struct command_continuation discard_continuation =
{ STATIC_HEADER, do_discard_continuation};

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struct command_context *
make_command_context(struct command_continuation *c,
		     struct exception_handler *e)
{
  NEW(command_context, self);
  self->c = c;
  self->e = e;
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  return self;
}
  
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/* GABA:
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   (class
     (name command_apply)
     (super command_frame)
     (vars
       (f object command)))
*/

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static void
do_command_apply(struct command_continuation *s,
		 struct lsh_object *value)
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{
  CAST(command_apply, self, s);
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  COMMAND_CALL(self->f, value,
	       self->super.up, self->super.e);
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}

struct command_continuation *
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make_apply(struct command *f,
	   struct command_continuation *c, struct exception_handler *e)
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{
  NEW(command_apply, res);
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  assert(f);
  assert(c);
  assert(e);
  
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  res->f = f;
  res->super.up = c;
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  res->super.e = e;
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  res->super.super.c = do_command_apply;

  return &res->super.super;
}
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/* GABA:
   (class
     (name gaba_continuation)
     (super command_continuation)
     (vars
       (value object lsh_object)))
*/

static void
do_gaba_continuation(struct command_continuation *c,
		     struct lsh_object *x)
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{
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  CAST(gaba_continuation, self, c);

  assert(!self->value);
  self->value = x;
}

struct lsh_object *
gaba_apply(struct lsh_object *f,
	   struct lsh_object *x)
{
  CAST_SUBTYPE(command, cf, f);
  struct gaba_continuation c =
  { { STATIC_HEADER, do_gaba_continuation }, NULL };

  COMMAND_CALL(cf, x, &c.super, &default_exception_handler);
  return c.value;
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}

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/* A command taking 2 arguments */
/* GABA:
   (class
     (name command_2_invoke)
     (super command)
     (vars
       (f object command_2)
       (a1 object lsh_object)))
*/

static void
do_command_2_invoke(struct command *s, struct lsh_object *a2,
		    struct command_continuation *c,
		    struct exception_handler *e)
{
  CAST(command_2_invoke, self, s);
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  COMMAND_2_INVOKE(self->f, self->a1, a2, c, e);
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}

struct command *
make_command_2_invoke(struct command_2 *f,
		      struct lsh_object *a1)
{
  NEW(command_2_invoke, self);

  self->super.call = do_command_2_invoke;
  self->f = f;
  self->a1 = a1;

  return &self->super;
}

void
do_command_2(struct command *s,
	     struct lsh_object *a1,
	     struct command_continuation *c,
	     struct exception_handler *e UNUSED)
{
  CAST(command_2, self, s);
  COMMAND_RETURN(c, make_command_2_invoke(self, a1));
}

/* A command taking 3 arguments */
/* GABA:
   (class
     (name command_3_invoke_2)
     (super command)
     (vars
       (f object command_3)
       (a1 object lsh_object)
       (a2 object lsh_object)))
*/

static void
do_command_3_invoke_2(struct command *s,
		      struct lsh_object *a3,
		      struct command_continuation *c,
		      struct exception_handler *e)
{
  CAST(command_3_invoke_2, self, s);
  self->f->invoke(self->a1, self->a2, a3, c, e);
}

struct command *
make_command_3_invoke_2(struct command_3 *f,
			struct lsh_object *a1,
			struct lsh_object *a2)
{
  NEW(command_3_invoke_2, self);

  self->super.call = do_command_3_invoke_2;
  self->f = f;
  self->a1 = a1;
  self->a2 = a2;

  return &self->super;
}

/* GABA:
   (class
     (name command_3_invoke)
     (super command)
     (vars
       (f object command_3)
       (a1 object lsh_object)))
*/

static void
do_command_3_invoke(struct command *s,
		    struct lsh_object *a2,
		    struct command_continuation *c,
		    struct exception_handler *e UNUSED)
{
  CAST(command_3_invoke, self, s);
  COMMAND_RETURN(c, make_command_3_invoke_2(self->f, self->a1, a2));
}

struct command *
make_command_3_invoke(struct command_3 *f,
		      struct lsh_object *a1)
{
  NEW(command_3_invoke, self);

  self->super.call = do_command_3_invoke;
  self->f = f;
  self->a1 = a1;

  return &self->super;
}

void
do_command_3(struct command *s,
	     struct lsh_object *a1,
	     struct command_continuation *c,
	     struct exception_handler *e UNUSED)
{
  CAST(command_3, self, s);
  COMMAND_RETURN(c, make_command_3_invoke(self, a1));
}


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/* A command taking 4 arguments */
/* GABA:
   (class
     (name command_4_invoke_3)
     (super command)
     (vars
       (f object command_4)
       (a1 object lsh_object)
       (a2 object lsh_object)
       (a3 object lsh_object)))
*/

static void
do_command_4_invoke_3(struct command *s,
		      struct lsh_object *a4,
		      struct command_continuation *c,
		      struct exception_handler *e)
{
  CAST(command_4_invoke_3, self, s);
  self->f->invoke(self->a1, self->a2, self->a3, a4, c, e);
}

struct command *
make_command_4_invoke_3(struct command_4 *f,
			struct lsh_object *a1,
			struct lsh_object *a2,
			struct lsh_object *a3)
{
  NEW(command_4_invoke_3, self);

  self->super.call = do_command_4_invoke_3;
  self->f = f;
  self->a1 = a1;
  self->a2 = a2;
  self->a3 = a3;

  return &self->super;
}

/* GABA:
   (class
     (name command_4_invoke_2)
     (super command)
     (vars
       (f object command_4)
       (a1 object lsh_object)
       (a2 object lsh_object)))
*/

static void
do_command_4_invoke_2(struct command *s,
		      struct lsh_object *a3,
		      struct command_continuation *c,
		      struct exception_handler *e UNUSED)
{
  CAST(command_4_invoke_2, self, s);
  COMMAND_RETURN(c, make_command_4_invoke_3(self->f, self->a1, self->a2, a3));
}

struct command *
make_command_4_invoke_2(struct command_4 *f,
			struct lsh_object *a1,
			struct lsh_object *a2)
{
  NEW(command_4_invoke_2, self);

  self->super.call = do_command_4_invoke_2;
  self->f = f;
  self->a1 = a1;
  self->a2 = a2;

  return &self->super;
}


/* GABA:
   (class
     (name command_4_invoke)
     (super command)
     (vars
       (f object command_4)
       (a1 object lsh_object)))
*/

static void
do_command_4_invoke(struct command *s,
		    struct lsh_object *a2,
		    struct command_continuation *c,
		    struct exception_handler *e UNUSED)
{
  CAST(command_4_invoke, self, s);
  COMMAND_RETURN(c, make_command_4_invoke_2(self->f, self->a1, a2));
}

struct command *
make_command_4_invoke(struct command_4 *f,
		      struct lsh_object *a1)
{
  NEW(command_4_invoke, self);

  self->super.call = do_command_4_invoke;
  self->f = f;
  self->a1 = a1;

  return &self->super;
}

void
do_command_4(struct command *s,
	     struct lsh_object *a1,
	     struct command_continuation *c,
	     struct exception_handler *e UNUSED)
{
  CAST(command_4, self, s);
  COMMAND_RETURN(c, make_command_4_invoke(self, a1));
}


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void
do_call_simple_command(struct command *s,
		       struct lsh_object *arg,
		       struct command_continuation *c,
		       struct exception_handler *e UNUSED)
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{
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  CAST_SUBTYPE(command_simple, self, s);
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  COMMAND_RETURN(c, COMMAND_SIMPLE_CALL(self, arg));
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}

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/* Tracing */

#if DEBUG_TRACE

/* GABA:
   (class
     (name trace_continuation)
     (super command_continuation)
     (vars
       (name . "const char *")
       (real object command_continuation)))
*/

static void
do_trace_continuation(struct command_continuation *s,
		      struct lsh_object *x)
{
  CAST(trace_continuation, self, s);

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  trace("Leaving %z, value of type %t.\n",
	self->name, x);
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  COMMAND_RETURN(self->real, x);
}

static struct command_continuation *
make_trace_continuation(const char *name,
			struct command_continuation *real)
{
  NEW(trace_continuation, self);
  self->super.c = do_trace_continuation;
  self->name = name;
  self->real = real;

  return &self->super;
}
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/* GABA:
   (class
     (name trace_command)
     (super command)
     (vars
       (name . "const char *")
       (real object command)))
*/

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static void
do_trace_command(struct command *s,
		 struct lsh_object *x,
		 struct command_continuation *c,
		 struct exception_handler *e)
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{
  CAST(trace_command, self, s);

  trace("Entering %z\n", self->name);
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#if 1
  COMMAND_CALL(self->real, x,
	       make_trace_continuation(self->name, c),
	       e);
#else
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  COMMAND_CALL(self->real, x, c, e);
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#endif
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}

struct command *make_trace(const char *name, struct command *real)
{
  NEW(trace_command, self);
  self->super.call = do_trace_command;
  self->name = name;
  self->real = real;

  return &self->super;
}

struct lsh_object *collect_trace(const char *name, struct lsh_object *c)
{
  CAST_SUBTYPE(command, real, c);
  return &make_trace(name, real)->super;
}
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#endif /* DEBUG_TRACE */
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/* GABA:
   (class
     (name parallell_progn)
     (super command)
     (vars
       (body object object_list)))
*/

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static void
do_parallell_progn(struct command *s,
		   struct lsh_object *x,
		   struct command_continuation *c,
		   struct exception_handler *e)
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{
  CAST(parallell_progn, self, s);
  unsigned i;
  
  for (i=0; i < LIST_LENGTH(self->body) - 1; i++)
    {
      CAST_SUBTYPE(command, command, LIST(self->body)[i]);
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      COMMAND_CALL(command, x, &discard_continuation, e);
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    }
  {
    CAST_SUBTYPE(command, command, LIST(self->body)[i]);
    
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    COMMAND_CALL(command, x, c, e);
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  }
}

struct command *make_parallell_progn(struct object_list *body)
{
  assert(LIST_LENGTH(body));
  {
    NEW(parallell_progn, self);
    self->body = body;
    self->super.call = do_parallell_progn;

    return &self->super;
  }
}
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DEFINE_COMMAND(progn_command)
     (struct command *s UNUSED,
      struct lsh_object *a,
      struct command_continuation *c,
      struct exception_handler *e UNUSED)
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{
  CAST(object_list, body, a);
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  COMMAND_RETURN(c, (LIST_LENGTH(body)
		     ? make_parallell_progn(body)
		     : &command_I));
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}
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/* Catch command
 *
 * (catch handler body x)
 *
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 * or
 *
 * ( (catch handler body) x)
 *
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 * Invokes (body x), with an exception handler that passes exceptions
 * of certain types to handler. */

/* GABA:
   (class
     (name catch_handler_info)
     (vars
       (mask . UINT32)
       (value . UINT32)
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       (ignore_value . int)
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       ; NULL handler means ignore all caught exceptions.
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       (handler object command)))
*/

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struct catch_handler_info *
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make_catch_handler_info(UINT32 mask, UINT32 value,
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			int ignore_value,
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			struct command *handler)
{
  NEW(catch_handler_info, self);
  self->mask = mask;
  self->value = value;
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  self->ignore_value = ignore_value;
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  self->handler = handler;

  return self;
}

/* GABA:
   (class
     (name catch_handler)
     (super exception_handler)
     (vars
       (c object command_continuation)
       (info object catch_handler_info)))
*/

static void
do_catch_handler(struct exception_handler *s,
		 const struct exception *e)
{
  CAST(catch_handler, self, s);
  
  if ((e->type & self->info->mask) == self->info->value)
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    {
      if (self->info->handler)
	COMMAND_CALL(self->info->handler,
		     e, self->c, self->super.parent);
      else
	trace("do_catch_handler: Ignoring exception: %z.\n",
	      e->msg);
    }
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  else
    EXCEPTION_RAISE(self->super.parent, e);
}

static struct exception_handler *
make_catch_handler(struct catch_handler_info *info,
		   struct command_continuation *c,
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		   struct exception_handler *e,
		   const char *context)
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{
  NEW(catch_handler, self);

  self->super.raise = do_catch_handler;
  self->super.parent = e;
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  self->super.context = context;
  
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  self->c = c;
  self->info = info;

  return &self->super;
}

/* GABA:
   (class
     (name catch_apply)
     (super command)
     (vars
       (info object catch_handler_info)
       (body object command)))
*/

static void
do_catch_apply(struct command *s,
	       struct lsh_object *a,
	       struct command_continuation *c,
	       struct exception_handler *e)
{
  CAST(catch_apply, self, s);
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  COMMAND_CALL(self->body, a, (self->info->ignore_value
			       ? &discard_continuation
			       : c),
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	       make_catch_handler(self->info, c, e,
				  HANDLER_CONTEXT));
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}

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struct command *
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make_catch_apply(struct catch_handler_info *info,
		 struct command *body)
{
  NEW(catch_apply, self);
  self->super.call = do_catch_apply;
  self->info = info;
  self->body = body;

  return &self->super;
}


/* GABA:
   (class
     (name catch_collect_body)
     (super command_simple)
     (vars
       (info object catch_handler_info)))
*/

static struct lsh_object *
do_catch_collect_body(struct command_simple *s,
		      struct lsh_object *a)
{
  CAST(catch_collect_body, self, s);
  CAST_SUBTYPE(command, body, a);

  return &make_catch_apply(self->info, body)->super;
}

static struct command *
make_catch_collect_body(struct catch_handler_info *info)
{
  NEW(catch_collect_body, self);
  self->super.super.call = do_call_simple_command;
  self->super.call_simple = do_catch_collect_body;
  self->info = info;

  return &self->super.super;
}

struct lsh_object *
do_catch_simple(struct command_simple *s,
		struct lsh_object *a)
{
  CAST(catch_command, self, s);
  CAST_SUBTYPE(command, f, a);

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  return &(make_catch_collect_body(make_catch_handler_info(self->mask,
							   self->value, self->ignore_value, f))
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	   ->super);
}
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/* Catch and report some exceptions.
 *
 * FIXME: This duplicates most of the catch command. */

/* GABA:
   (class
     (name catch_report_apply)
     (super command)
     (vars
       (info object report_exception_info)
       (body object command)))
*/
   
static void
do_catch_report_apply(struct command *s,
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		      struct lsh_object *a,
		      struct command_continuation *c,
		      struct exception_handler *e)
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{
  CAST(catch_report_apply, self, s);

  COMMAND_CALL(self->body, a, c,
	       make_report_exception_handler(self->info, e,
					     HANDLER_CONTEXT));
}

struct command *
make_catch_report_apply(struct report_exception_info *info,
			struct command *body)
{
  NEW(catch_report_apply, self);
  self->super.call = do_catch_report_apply;
  self->info = info;
  self->body = body;

  return &self->super;
}

struct lsh_object *
do_catch_report_collect(struct command_simple *s,
			struct lsh_object *a)
{
  CAST(catch_report_collect, self, s);
  CAST_SUBTYPE(command, body, a);

  return &make_catch_report_apply(self->info, body)->super;
}