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/* Guile utilities.
Copyright (C) 2013 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs 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 3 of the License, or
(at your option) any later version.
GNU Emacs 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 GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include "lisp.h"
scm_t_bits c_closure_tag;
typedef SCM (*c_closure_0_t) (void *);
typedef SCM (*c_closure_1_t) (void *, SCM);
typedef SCM (*c_closure_2_t) (void *, SCM, SCM);
typedef SCM (*c_closure_3_t) (void *, SCM, SCM, SCM);
typedef SCM (*c_closure_4_t) (void *, SCM, SCM, SCM, SCM);
typedef SCM (*c_closure_5_t) (void *, SCM, SCM, SCM, SCM, SCM);
typedef SCM (*c_closure_6_t) (void *, SCM, SCM, SCM, SCM, SCM, SCM);
typedef SCM (*c_closure_7_t) (void *, SCM, SCM, SCM, SCM, SCM, SCM, SCM);
SCM
make_c_closure (SCM (*func) (), void *data, int req, int opt)
{
SCM smob;
if (req > 3 || opt > 1)
emacs_abort ();
SCM_NEWSMOB2 (smob, c_closure_tag, func, data);
SCM_SET_SMOB_FLAGS (smob, req | (opt << 2));
return smob;
}
static SCM
apply_c_closure (SCM c_closure, SCM args)
{
int req, opt;
SCM cargs[7];
long nargs = scm_to_long (scm_length (args));
scm_t_bits flags = SCM_SMOB_FLAGS (c_closure);
scm_t_bits func = SCM_SMOB_DATA (c_closure);
void *data = (void *) SCM_SMOB_DATA_2 (c_closure);
req = flags & 3;
opt = (flags >> 2) & 1;
for (int i = 0; i < req + opt; i++)
{
if (scm_is_pair (args))
{
cargs[i] = scm_car (args);
args = scm_cdr (args);
}
else if (opt)
{
cargs[i] = SCM_UNDEFINED;
}
else
scm_wrong_num_args (c_closure);
}
switch (req + opt)
{
case 0: return ((c_closure_0_t) func) (data);
case 1: return ((c_closure_1_t) func) (data, cargs[0]);
case 2: return ((c_closure_2_t) func) (data, cargs[0], cargs[1]);
case 3: return ((c_closure_3_t) func) (data, cargs[0], cargs[1], cargs[2]);
case 4: return ((c_closure_4_t) func) (data, cargs[0], cargs[1], cargs[2], cargs[3]);
default:
emacs_abort ();
}
}
void
init_guile (void)
{
c_closure_tag = scm_make_smob_type ("c-closure", 0);
scm_set_smob_apply (c_closure_tag, apply_c_closure, 0, 0, 1);
}
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