1 /* Copyright (C) 2000, 2001, 2006, 2008, 2009, 2011, 2012 Free Software Foundation, Inc.
3 * This library is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU Lesser General Public License
5 * as published by the Free Software Foundation; either version 3 of
6 * the License, or (at your option) any later version.
8 * This library is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * Lesser General Public License for more details.
13 * You should have received a copy of the GNU Lesser General Public
14 * License along with this library; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 #include "libguile/_scm.h"
24 #include "libguile/eval.h"
25 #include "libguile/feature.h"
26 #include "libguile/gc.h"
27 #include "libguile/numbers.h"
28 #include "libguile/ports.h"
29 #include "libguile/root.h"
30 #include "libguile/strings.h"
31 #include "libguile/struct.h"
32 #include "libguile/validate.h"
34 #include "libguile/values.h"
36 SCM scm_values_vtable
;
38 /* OBJ must be a values object containing exactly two values.
39 scm_i_extract_values_2 puts those two values into *p1 and *p2. */
41 scm_i_extract_values_2 (SCM obj
, SCM
*p1
, SCM
*p2
)
45 SCM_ASSERT_TYPE (SCM_VALUESP (obj
), obj
, SCM_ARG1
,
46 "scm_i_extract_values_2", "values");
47 values
= scm_struct_ref (obj
, SCM_INUM0
);
48 if (scm_ilength (values
) != 2)
49 scm_wrong_type_arg_msg
50 ("scm_i_extract_values_2", SCM_ARG1
, obj
,
51 "a values object containing exactly two values");
52 *p1
= SCM_CAR (values
);
53 *p2
= SCM_CADR (values
);
57 print_values (SCM obj
, SCM pwps
)
59 SCM values
= scm_struct_ref (obj
, SCM_INUM0
);
60 SCM port
= SCM_PORT_WITH_PS_PORT (pwps
);
61 scm_print_state
*ps
= SCM_PRINT_STATE (SCM_PORT_WITH_PS_PS (pwps
));
63 scm_puts_unlocked ("#<values ", port
);
64 scm_iprin1 (values
, port
, ps
);
65 scm_puts_unlocked (">", port
);
67 return SCM_UNSPECIFIED
;
71 scm_c_nvalues (SCM obj
)
73 if (SCM_LIKELY (SCM_VALUESP (obj
)))
74 return scm_ilength (scm_struct_ref (obj
, SCM_INUM0
));
80 scm_c_value_ref (SCM obj
, size_t idx
)
82 if (SCM_LIKELY (SCM_VALUESP (obj
)))
84 SCM values
= scm_struct_ref (obj
, SCM_INUM0
);
86 while (SCM_LIKELY (scm_is_pair (values
)))
89 return SCM_CAR (values
);
90 values
= SCM_CDR (values
);
97 scm_error (scm_out_of_range_key
,
99 "Too few values in ~S to access index ~S",
100 scm_list_2 (obj
, scm_from_size_t (idx
)),
101 scm_list_1 (scm_from_size_t (idx
)));
104 SCM_DEFINE (scm_values
, "values", 0, 0, 1,
106 "Delivers all of its arguments to its continuation. Except for\n"
107 "continuations created by the @code{call-with-values} procedure,\n"
108 "all continuations take exactly one value. The effect of\n"
109 "passing no value or more than one value to continuations that\n"
110 "were not created by @code{call-with-values} is unspecified.")
111 #define FUNC_NAME s_scm_values
116 SCM_VALIDATE_LIST_COPYLEN (1, args
, n
);
118 result
= SCM_CAR (args
);
120 result
= scm_c_make_struct (scm_values_vtable
, 0, 1, SCM_UNPACK (args
));
127 scm_c_values (SCM
*base
, size_t nvalues
)
134 for (ret
= SCM_EOL
, walk
= base
+ nvalues
- 1; walk
>= base
; walk
--)
135 ret
= scm_cons (*walk
, ret
);
137 return scm_values (ret
);
141 scm_init_values (void)
143 SCM print
= scm_c_define_gsubr ("%print-values", 2, 0, 0, print_values
);
145 scm_values_vtable
= scm_make_vtable (scm_from_locale_string ("pr"), print
);
147 scm_add_feature ("values");
149 #include "libguile/values.x"