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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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:
{ intptr_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_ex(name, &n, CVT_ALL) )
{ 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_ex(name, &n, CVT_ALL) ||
!PL_get_chars_ex(file, &f, CVT_ALL) )
fail;
if ( !PL_get_chars_ex(class, &c, CVT_ALL) &&
!PL_unify_atom_chars(class, c) )
fail;
if ( !PL_get_chars_ex(encoding, &enc, CVT_ALL) &&
!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);
}
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