| 1 | /* Guile utilities. |
| 2 | |
| 3 | Copyright (C) 2013 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GNU Emacs. |
| 6 | |
| 7 | GNU Emacs is free software: you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation, either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | GNU Emacs is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include <config.h> |
| 21 | #include "lisp.h" |
| 22 | |
| 23 | scm_t_bits c_closure_tag; |
| 24 | |
| 25 | typedef SCM (*c_closure_0_t) (void *); |
| 26 | typedef SCM (*c_closure_1_t) (void *, SCM); |
| 27 | typedef SCM (*c_closure_2_t) (void *, SCM, SCM); |
| 28 | typedef SCM (*c_closure_3_t) (void *, SCM, SCM, SCM); |
| 29 | typedef SCM (*c_closure_4_t) (void *, SCM, SCM, SCM, SCM); |
| 30 | typedef SCM (*c_closure_5_t) (void *, SCM, SCM, SCM, SCM, SCM); |
| 31 | typedef SCM (*c_closure_6_t) (void *, SCM, SCM, SCM, SCM, SCM, SCM); |
| 32 | typedef SCM (*c_closure_7_t) (void *, SCM, SCM, SCM, SCM, SCM, SCM, SCM); |
| 33 | |
| 34 | SCM |
| 35 | make_c_closure (SCM (*func) (), void *data, int req, int opt) |
| 36 | { |
| 37 | SCM smob; |
| 38 | |
| 39 | if (req > 3 || opt > 1) |
| 40 | emacs_abort (); |
| 41 | |
| 42 | SCM_NEWSMOB2 (smob, c_closure_tag, func, data); |
| 43 | SCM_SET_SMOB_FLAGS (smob, req | (opt << 2)); |
| 44 | return smob; |
| 45 | } |
| 46 | |
| 47 | static SCM |
| 48 | apply_c_closure (SCM c_closure, SCM args) |
| 49 | { |
| 50 | int req, opt; |
| 51 | SCM cargs[7]; |
| 52 | long nargs = scm_to_long (scm_length (args)); |
| 53 | scm_t_bits flags = SCM_SMOB_FLAGS (c_closure); |
| 54 | scm_t_bits func = SCM_SMOB_DATA (c_closure); |
| 55 | void *data = (void *) SCM_SMOB_DATA_2 (c_closure); |
| 56 | |
| 57 | req = flags & 3; |
| 58 | opt = (flags >> 2) & 1; |
| 59 | |
| 60 | for (int i = 0; i < req + opt; i++) |
| 61 | { |
| 62 | if (scm_is_pair (args)) |
| 63 | { |
| 64 | cargs[i] = scm_car (args); |
| 65 | args = scm_cdr (args); |
| 66 | } |
| 67 | else if (opt) |
| 68 | { |
| 69 | cargs[i] = SCM_UNDEFINED; |
| 70 | } |
| 71 | else |
| 72 | scm_wrong_num_args (c_closure); |
| 73 | } |
| 74 | |
| 75 | switch (req + opt) |
| 76 | { |
| 77 | case 0: return ((c_closure_0_t) func) (data); |
| 78 | case 1: return ((c_closure_1_t) func) (data, cargs[0]); |
| 79 | case 2: return ((c_closure_2_t) func) (data, cargs[0], cargs[1]); |
| 80 | case 3: return ((c_closure_3_t) func) (data, cargs[0], cargs[1], cargs[2]); |
| 81 | case 4: return ((c_closure_4_t) func) (data, cargs[0], cargs[1], cargs[2], cargs[3]); |
| 82 | default: |
| 83 | emacs_abort (); |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | void |
| 88 | init_guile (void) |
| 89 | { |
| 90 | c_closure_tag = scm_make_smob_type ("c-closure", 0); |
| 91 | scm_set_smob_apply (c_closure_tag, apply_c_closure, 0, 0, 1); |
| 92 | } |