| 1 | /*
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| 2 | * dl.c - Example of adding a new builtin function to gawk.
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| 3 | *
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| 4 | * Christos Zoulas, Thu Jun 29 17:40:41 EDT 1995
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| 5 | * Arnold Robbins, update for 3.1, Wed Sep 13 09:38:56 2000
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| 6 | */
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| 7 |
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| 8 | /*
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| 9 | * Copyright (C) 1995 - 2001 the Free Software Foundation, Inc.
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| 10 | *
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| 11 | * This file is part of GAWK, the GNU implementation of the
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| 12 | * AWK Programming Language.
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| 13 | *
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| 14 | * GAWK is free software; you can redistribute it and/or modify
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| 15 | * it under the terms of the GNU General Public License as published by
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| 16 | * the Free Software Foundation; either version 2 of the License, or
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| 17 | * (at your option) any later version.
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| 18 | *
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| 19 | * GAWK is distributed in the hope that it will be useful,
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| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 22 | * GNU General Public License for more details.
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| 23 | *
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| 24 | * You should have received a copy of the GNU General Public License
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| 25 | * along with this program; if not, write to the Free Software
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| 26 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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| 27 | */
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| 28 |
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| 29 | #include "awk.h"
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| 30 | #include <dlfcn.h>
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| 31 |
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| 32 | static void *sdl = NULL;
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| 33 |
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| 34 | static NODE *
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| 35 | zaxxon(tree)
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| 36 | NODE *tree;
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| 37 | {
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| 38 | NODE *obj;
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| 39 | int i;
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| 40 | int comma = 0;
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| 41 |
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| 42 | /*
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| 43 | * Print the arguments
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| 44 | */
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| 45 | printf("External linkage %s(", tree->param);
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| 46 |
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| 47 | for (i = 0; i < tree->param_cnt; i++) {
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| 48 |
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| 49 | obj = get_argument(tree, i);
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| 50 |
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| 51 | if (obj == NULL)
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| 52 | break;
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| 53 |
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| 54 | force_string(obj);
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| 55 |
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| 56 | printf(comma ? ", %s" : "%s", obj->stptr);
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| 57 | free_temp(obj);
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| 58 | comma = 1;
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| 59 | }
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| 60 |
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| 61 | printf(");\n");
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| 62 |
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| 63 | /*
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| 64 | * Do something useful
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| 65 | */
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| 66 | obj = get_argument(tree, 0);
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| 67 |
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| 68 | if (obj != NULL) {
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| 69 | force_string(obj);
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| 70 | if (strcmp(obj->stptr, "unload") == 0 && sdl) {
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| 71 | /*
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| 72 | * XXX: How to clean up the function?
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| 73 | * I would like the ability to remove a function...
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| 74 | */
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| 75 | dlclose(sdl);
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| 76 | sdl = NULL;
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| 77 | }
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| 78 | free_temp(obj);
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| 79 | }
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| 80 |
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| 81 | /* Set the return value */
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| 82 | set_value(tmp_number((AWKNUM) 3.14));
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| 83 |
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| 84 | /* Just to make the interpreter happy */
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| 85 | return tmp_number((AWKNUM) 0);
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| 86 | }
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| 87 |
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| 88 | NODE *
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| 89 | dlload(tree, dl)
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| 90 | NODE *tree;
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| 91 | void *dl;
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| 92 | {
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| 93 | sdl = dl;
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| 94 | make_builtin("zaxxon", zaxxon, 4);
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| 95 | return tmp_number((AWKNUM) 0);
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| 96 | }
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