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/*
* dl.c - Example of adding a new builtin function to gawk.
*
* Christos Zoulas, Thu Jun 29 17:40:41 EDT 1995
* Arnold Robbins, update for 3.1, Wed Sep 13 09:38:56 2000
*/
/*
* Copyright (C) 1995 - 2001 the Free Software Foundation, Inc.
*
* This file is part of GAWK, the GNU implementation of the
* AWK Programming Language.
*
* GAWK is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GAWK 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "awk.h"
#include <dlfcn.h>
static void *sdl = NULL;
static NODE *
zaxxon(tree)
NODE *tree;
{
NODE *obj;
int i;
int comma = 0;
/*
* Print the arguments
*/
printf("External linkage %s(", tree->param);
for (i = 0; i < tree->param_cnt; i++) {
obj = get_argument(tree, i);
if (obj == NULL)
break;
force_string(obj);
printf(comma ? ", %s" : "%s", obj->stptr);
free_temp(obj);
comma = 1;
}
printf(");\n");
/*
* Do something useful
*/
obj = get_argument(tree, 0);
if (obj != NULL) {
force_string(obj);
if (strcmp(obj->stptr, "unload") == 0 && sdl) {
/*
* XXX: How to clean up the function?
* I would like the ability to remove a function...
*/
dlclose(sdl);
sdl = NULL;
}
free_temp(obj);
}
/* Set the return value */
set_value(tmp_number((AWKNUM) 3.14));
/* Just to make the interpreter happy */
return tmp_number((AWKNUM) 0);
}
NODE *
dlload(tree, dl)
NODE *tree;
void *dl;
{
sdl = dl;
make_builtin("zaxxon", zaxxon, 4);
return tmp_number((AWKNUM) 0);
}
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