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/* Copyright 2000-2001,2006,2008-2009,2011-2013,2016-2019
Free Software Foundation, Inc.
This file is part of Guile.
Guile 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 3 of the License, or
(at your option) any later version.
Guile 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 Guile. If not, see
<https://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "feature.h"
#include "gc.h"
#include "gsubr.h"
#include "list.h"
#include "numbers.h"
#include "pairs.h"
#include "values.h"
/* OBJ must be a values object containing exactly two values.
scm_i_extract_values_2 puts those two values into *p1 and *p2. */
void
scm_i_extract_values_2 (SCM obj, SCM *p1, SCM *p2)
{
SCM_ASSERT_TYPE (scm_is_values (obj), obj, SCM_ARG1,
"scm_i_extract_values_2", "values");
if (scm_i_nvalues (obj) != 2)
scm_wrong_type_arg_msg
("scm_i_extract_values_2", SCM_ARG1, obj,
"a values object containing exactly two values");
*p1 = scm_i_value_ref (obj, 0);
*p2 = scm_i_value_ref (obj, 1);
}
size_t
scm_c_nvalues (SCM obj)
{
if (SCM_LIKELY (scm_is_values (obj)))
return scm_i_nvalues (obj);
else
return 1;
}
SCM
scm_c_value_ref (SCM obj, size_t idx)
{
if (scm_is_values (obj))
{
if (idx < scm_i_nvalues (obj))
return scm_i_value_ref (obj, idx);
}
else
{
if (idx == 0)
return obj;
}
scm_error (scm_out_of_range_key,
"scm_c_value_ref",
"Too few values in ~S to access index ~S",
scm_list_2 (obj, scm_from_size_t (idx)),
scm_list_1 (scm_from_size_t (idx)));
}
SCM_DEFINE (scm_values, "values", 0, 0, 1,
(SCM args),
"Delivers all of its arguments to its continuation. Except for\n"
"continuations created by the @code{call-with-values} procedure,\n"
"all continuations take exactly one value. The effect of\n"
"passing no value or more than one value to continuations that\n"
"were not created by @code{call-with-values} is unspecified.")
#define FUNC_NAME s_scm_values
{
long n;
SCM result;
SCM_VALIDATE_LIST_COPYLEN (1, args, n);
if (n == 1)
result = SCM_CAR (args);
else
{
size_t i;
if ((size_t) n > (size_t) (UINTPTR_MAX >> 8))
scm_error (scm_out_of_range_key, FUNC_NAME, "Too many values",
SCM_EOL, SCM_EOL);
result = scm_words ((((scm_t_bits) n) << 8) | scm_tc7_values, n + 1);
for (i = 0; i < n; i++, args = SCM_CDR (args))
SCM_SET_CELL_OBJECT (result, i + 1, SCM_CAR (args));
}
return result;
}
#undef FUNC_NAME
SCM
scm_c_values (SCM *base, size_t nvalues)
{
SCM ret;
size_t i;
if (nvalues == 1)
return *base;
if ((uintptr_t) nvalues > (UINTPTR_MAX >> 8))
scm_error (scm_out_of_range_key, "scm_c_values", "Too many values",
SCM_EOL, SCM_EOL);
ret = scm_words ((((scm_t_bits) nvalues) << 8) | scm_tc7_values, nvalues + 1);
for (i = 0; i < nvalues; i++)
SCM_SET_CELL_OBJECT (ret, i + 1, base[i]);
return ret;
}
SCM
scm_values_2 (SCM a, SCM b)
{
SCM ret;
ret = scm_words ((2 << 8) | scm_tc7_values, 3);
SCM_SET_CELL_OBJECT_1 (ret, a);
SCM_SET_CELL_OBJECT_2 (ret, b);
return ret;
}
SCM
scm_values_3 (SCM a, SCM b, SCM c)
{
SCM ret;
ret = scm_words ((3 << 8) | scm_tc7_values, 4);
SCM_SET_CELL_OBJECT_1 (ret, a);
SCM_SET_CELL_OBJECT_2 (ret, b);
SCM_SET_CELL_OBJECT_3 (ret, c);
return ret;
}
void
scm_init_values (void)
{
scm_add_feature ("values");
#include "values.x"
}
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