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58ade102 | 1 | /* Copyright (C) 2000, 2001 Free Software Foundation, Inc. |
ce212434 GH |
2 | * |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License as published by | |
5 | * the Free Software Foundation; either version 2, or (at your option) | |
6 | * any later version. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this software; see the file COPYING. If not, write to | |
15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, | |
16 | * Boston, MA 02111-1307 USA | |
17 | * | |
18 | * As a special exception, the Free Software Foundation gives permission | |
19 | * for additional uses of the text contained in its release of GUILE. | |
20 | * | |
21 | * The exception is that, if you link the GUILE library with other files | |
22 | * to produce an executable, this does not by itself cause the | |
23 | * resulting executable to be covered by the GNU General Public License. | |
24 | * Your use of that executable is in no way restricted on account of | |
25 | * linking the GUILE library code into it. | |
26 | * | |
27 | * This exception does not however invalidate any other reasons why | |
28 | * the executable file might be covered by the GNU General Public License. | |
29 | * | |
30 | * This exception applies only to the code released by the | |
31 | * Free Software Foundation under the name GUILE. If you copy | |
32 | * code from other Free Software Foundation releases into a copy of | |
33 | * GUILE, as the General Public License permits, the exception does | |
34 | * not apply to the code that you add in this way. To avoid misleading | |
35 | * anyone as to the status of such modified files, you must delete | |
36 | * this exception notice from them. | |
37 | * | |
38 | * If you write modifications of your own for GUILE, it is your choice | |
39 | * whether to permit this exception to apply to your modifications. | |
40 | * If you do not wish that, delete this exception notice. */ | |
41 | ||
42 | #include "libguile/_scm.h" | |
43 | #include "libguile/eval.h" | |
44 | #include "libguile/feature.h" | |
45 | #include "libguile/gc.h" | |
46 | #include "libguile/numbers.h" | |
47 | #include "libguile/ports.h" | |
48 | #include "libguile/root.h" | |
49 | #include "libguile/strings.h" | |
50 | #include "libguile/struct.h" | |
51 | #include "libguile/validate.h" | |
52 | ||
53 | #include "libguile/values.h" | |
54 | ||
752af227 | 55 | SCM scm_values_vtable; |
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56 | |
57 | static SCM | |
58 | print_values (SCM obj, SCM pwps) | |
59 | { | |
60 | SCM values = scm_struct_ref (obj, SCM_INUM0); | |
61 | SCM port = SCM_PORT_WITH_PS_PORT (pwps); | |
62 | scm_print_state *ps = SCM_PRINT_STATE (SCM_PORT_WITH_PS_PS (pwps)); | |
63 | ||
9d47027e MV |
64 | scm_puts ("#<values ", port); |
65 | scm_iprin1 (values, port, ps); | |
66 | scm_puts (">", port); | |
67 | ||
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68 | return SCM_UNSPECIFIED; |
69 | } | |
70 | ||
71 | SCM_DEFINE (scm_values, "values", 0, 0, 1, | |
72 | (SCM args), | |
73 | "Delivers all of its arguments to its continuation. Except for\n" | |
647e35e2 MG |
74 | "continuations created by the @code{call-with-values} procedure,\n" |
75 | "all continuations take exactly one value. The effect of\n" | |
76 | "passing no value or more than one value to continuations that\n" | |
77 | "were not created by @code{call-with-values} is unspecified.") | |
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78 | #define FUNC_NAME s_scm_values |
79 | { | |
c014a02e | 80 | long n; |
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81 | SCM result; |
82 | ||
83 | SCM_VALIDATE_LIST_COPYLEN (1, args, n); | |
84 | if (n == 1) | |
85 | result = SCM_CAR (args); | |
86 | else | |
87 | { | |
752af227 | 88 | result = scm_make_struct (scm_values_vtable, SCM_INUM0, |
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89 | scm_cons (args, SCM_EOL)); |
90 | } | |
91 | ||
92 | return result; | |
93 | } | |
94 | #undef FUNC_NAME | |
95 | ||
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96 | void |
97 | scm_init_values (void) | |
98 | { | |
9a441ddb MV |
99 | SCM print = scm_c_define_subr ("%print-values", scm_tc7_subr_2, |
100 | print_values); | |
ce212434 | 101 | |
752af227 | 102 | scm_values_vtable |
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103 | = scm_permanent_object (scm_make_vtable_vtable (scm_makfrom0str ("pr"), |
104 | SCM_INUM0, SCM_EOL)); | |
752af227 | 105 | SCM_SET_STRUCT_PRINTER (scm_values_vtable, print); |
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106 | |
107 | scm_add_feature ("values"); | |
108 | ||
109 | #ifndef SCM_MAGIC_SNARFER | |
110 | #include "libguile/values.x" | |
111 | #endif | |
112 | } | |
113 | ||
114 | /* | |
115 | Local Variables: | |
116 | c-file-style: "gnu" | |
117 | End: | |
118 | */ |