File: pl-rc.c

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/*  $Id$

    Part of SWI-Prolog

    Author:        Jan Wielemaker
    E-mail:        jan@swi.psy.uva.nl
    WWW:           http://www.swi-prolog.org
    Copyright (C): 1985-2002, University of Amsterdam

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/

#include "rc/rc.h"
#include "pl-incl.h"
#ifndef MAXPATHLEN
#define MAXPATHLEN 1024
#endif

static int
Scontrol_rc(void *handle, int action, void *arg)
{ RcMember m = ((RcObject)handle)->member;

  switch(action)
  { case SIO_GETSIZE:
    { int64_t *rval = arg;

      *rval = m->size;
      return 0;
    }
    case SIO_FLUSHOUTPUT:
    case SIO_SETENCODING:
      return 0;
    default:
      return -1;
  }
}


static IOFUNCTIONS rc_stream_functions =
{ (Sread_function)  rc_read,
  (Swrite_function) rc_write,
  (Sseek_function)  rc_seek,
  (Sclose_function) rc_close,
		    Scontrol_rc
};


		 /*******************************
		 *	STREAM CONNECTION	*
		 *******************************/

IOSTREAM *
SopenRC(void *rca, const char *name, const char *rcclass, int flags)
{ RcObject o = rc_open(rca, name, rcclass, flags);

  if ( o )
  { int sflags = ((flags & RC_WRONLY) ? SIO_OUTPUT : SIO_INPUT);

    return Snew(o, sflags, &rc_stream_functions);
  }

  return NULL;
}


		 /*******************************
		 *	 PROLOG PREDICATES	*
		 *******************************/

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Connection between the resource library and SWI-Prolog, C-part.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

static int
get_rc(term_t handle, RcArchive *a)
{ GET_LD
  void *p;

  if ( PL_get_pointer(handle, &p) )
  { *a = p;

    return TRUE;
  }

  return PL_error(NULL, 0, NULL, ERR_TYPE,
		  ATOM_resource_handle, handle);
}


foreign_t
pl_rc_handle(term_t h)
{ GET_LD

  if ( GD->resourceDB )
    return PL_unify_pointer(h, GD->resourceDB);

  return FALSE;
}


foreign_t
pl_rc_open(term_t rc_h,
	   term_t name, term_t class, term_t rw,
	   term_t handle)
{ GET_LD
  char *n, *c;
  RcArchive rc = NULL;
  atom_t how;
  int flags = 0, sflags = 0;		/* compiler isn't smart enough */

  if ( !get_rc(rc_h, &rc) )
    return FALSE;

  if ( PL_get_atom_ex(rw, &how) )
  { if ( how == ATOM_read )
    { flags = RC_RDONLY;
      sflags = SIO_INPUT;
    } else if ( how == ATOM_write )
    { flags = RC_WRONLY;
      sflags = SIO_OUTPUT;
    } else
      return PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_io_mode, how);
  }

  if ( PL_get_chars(name, &n, CVT_ALL|CVT_EXCEPTION) )
  { RcObject o;

    if ( !PL_get_chars(class, &c, CVT_ALL) )
      c = NULL;

    if ( (o = rc_open(rc, n, c, flags)) )
    { IOSTREAM *stream;

      if ( !c )
      { rc_stat_buf stat;

	rc_stat(o, &stat);

	if ( !PL_unify_atom_chars(class, stat.rc_class) )
	{ rc_close(o);

	  return FALSE;
	}
      }

      if ( (stream = Snew(o, sflags, &rc_stream_functions)) )
      { if ( PL_unify_stream(handle, stream) )
	  return TRUE;

	Sclose(stream);
	return FALSE;
      }
    } else
      return FALSE;
  }

  fail;
}


foreign_t
pl_rc_open_archive(term_t file, term_t handle)
{ char *name;

  if ( PL_get_file_name(file, &name, 0) )
  { RcArchive a = rc_open_archive(name, RC_RDWR|RC_CREATE);

    if ( a )
    { GET_LD
      return PL_unify_pointer(handle, a);
    }
  }

  return FALSE;
}


foreign_t
pl_rc_close_archive(term_t rc_h)
{ RcArchive rc = NULL;

  if ( !get_rc(rc_h, &rc) )
    return FALSE;

  if ( rc->modified )
    rc_save_archive(rc, NULL);

  return rc_close_archive(rc);
}


foreign_t
pl_rc_save_archive(term_t rc_h, term_t to)
{ GET_LD
  RcArchive rc = NULL;
  char *file;

  if ( !get_rc(rc_h, &rc) )
    return FALSE;
  if ( !PL_get_file_name(to, &file, 0) &&
       !PL_is_variable(to) )
    return PL_error(NULL, 0, NULL, ERR_TYPE, ATOM_file_name, to);

  if ( rc_save_archive(rc, file) )
  { if ( PL_is_variable(to) &&
	 !PL_unify_atom_chars(to, rc->path) )
      return FALSE;			/* resource error */

    return TRUE;
  }

  return PL_error("rc_save_archive", 2,
		  rc_strerror(rc_errno), ERR_FILE_OPERATION,
		  ATOM_write, ATOM_file, to);
}


foreign_t
pl_rc_append_file(term_t rc_h,
		  term_t name, term_t class, term_t encoding,
		  term_t file)
{ RcArchive rc = NULL;
  char *n, *c = "data", *enc = "none", *f;

  if ( !get_rc(rc_h, &rc) )
    return FALSE;
  if ( !PL_get_chars(name, &n, CVT_ALL|CVT_EXCEPTION) ||
       !PL_get_chars(file, &f, CVT_ALL|CVT_EXCEPTION) )
    fail;

  if ( !PL_get_chars(class, &c, CVT_ALL|CVT_EXCEPTION) &&
       !PL_unify_atom_chars(class, c) )
    fail;
  if ( !PL_get_chars(encoding, &enc, CVT_ALL|CVT_EXCEPTION) &&
       !PL_unify_atom_chars(encoding, enc) )
    fail;

  if ( !rc_append_file(rc, n, c, enc, f) )
    return FALSE;

  return TRUE;
}


/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
$rc_members(+RCHandle, -ListOfMembers)
	Yields a list of rc(Name, Class), representing the members of the
	resource archive.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

foreign_t
pl_rc_members(term_t rc_h, term_t members)
{ GET_LD
  RcArchive rc = NULL;
  RcMember m;
  functor_t f;
  term_t tail = PL_copy_term_ref(members);
  term_t head = PL_new_term_ref();

  if ( !get_rc(rc_h, &rc) )
    return FALSE;

  f = PL_new_functor(PL_new_atom("rc"), 2);
  for(m = rc->members; m; m = m->next)
  { if ( !PL_unify_list(tail, head, tail) ||
	 !PL_unify_term(head,
			PL_FUNCTOR, f,
			  PL_CHARS, m->name,
			  PL_CHARS, m->rc_class) )
      return FALSE;
  }

  return PL_unify_nil(tail);
}