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/*
* ext.c - Builtin function that links external gawk functions and related
* utilities.
*
* Christos Zoulas, Thu Jun 29 17:40:41 EDT 1995
* Arnold Robbins, update for 3.1, Mon Nov 23 12:53:39 EST 1998
*/
/*
* Copyright (C) 1995 - 2001, 2003-2005 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "awk.h"
#ifdef DYNAMIC
#include <dlfcn.h>
#ifdef __GNUC__
static unsigned long long dummy; /* fake out gcc for dynamic loading? */
#endif
extern int errcount;
/* do_ext --- load an extension */
NODE *
do_ext(NODE *tree)
{
NODE *obj;
NODE *fun;
NODE *(*func) P((NODE *, void *));
void *dl;
int flags = RTLD_LAZY;
#ifdef __GNUC__
AWKNUM junk;
junk = (AWKNUM) dummy;
#endif
if (do_lint)
lintwarn(_("`extension' is a gawk extension"));
if (do_traditional || do_posix) {
errcount++;
error(_("`extension' is a gawk extension"));
}
obj = tree_eval(tree->lnode);
force_string(obj);
#ifdef RTLD_GLOBAL
flags |= RTLD_GLOBAL;
#endif
if ((dl = dlopen(obj->stptr, flags)) == NULL)
fatal(_("extension: cannot open `%s' (%s)\n"), obj->stptr,
dlerror());
fun = tree_eval(tree->rnode->lnode);
force_string(fun);
func = (NODE *(*) P((NODE *, void *))) dlsym(dl, fun->stptr);
if (func == NULL)
fatal(_("extension: library `%s': cannot call function `%s' (%s)\n"),
obj->stptr, fun->stptr, dlerror());
free_temp(obj);
free_temp(fun);
return (*func)(tree, dl);
}
/* make_builtin --- register name to be called as func with a builtin body */
void
make_builtin(char *name, NODE *(*func) P((NODE *)), int count)
{
NODE *p, *b, *f;
char **vnames, *parm_names, *sp;
char c, buf[200];
int space_needed, i;
sp = name;
if (sp == NULL || *sp == '\0')
fatal(_("extension: missing function name"));
while ((c = *sp++) != '\0')
if ((sp == &name[1] && c != '_' && ! ISALPHA(c))
|| (sp > &name[1] && ! is_identchar(c)))
fatal(_("extension: illegal character `%c' in function name `%s'"), c, name);
f = lookup(name);
if (f != NULL) {
if (f->type == Node_func) {
if (f->rnode->type != Node_builtin) /* user-defined function */
fatal(_("extension: can't redefine function `%s'"), name);
else {
/* multiple extension() calls etc. */
if (do_lint)
lintwarn(_("extension: function `%s' already defined"), name);
return;
}
} else {
if (check_special(name) >= 0)
fatal(_("extension: can't use gawk built-in `%s' as function name"), name);
/* variable name etc. */
fatal(_("extension: function name `%s' previously defined"), name);
}
}
/* count parameters, create artificial list of param names */
space_needed = 0;
for (i = 0; i < count; i++) {
sprintf(buf, "p%d", i);
space_needed += strlen(buf) + 1;
}
emalloc(parm_names, char *, space_needed, "make_builtin");
emalloc(vnames, char **, count * sizeof(char *), "make_builtin");
sp = parm_names;
for (i = 0; i < count; i++) {
sprintf(sp, "p%d",i);
vnames[i] = sp;
sp += strlen(sp) + 1;
}
getnode(p);
p->type = Node_param_list;
p->flags |= FUNC;
p->rnode = NULL;
p->param = name;
p->param_cnt = count;
#if 0
/* setting these blows away the param_cnt. dang unions! */
p->source_line = __LINE__;
p->source_file = __FILE__;
#endif
getnode(b);
b->type = Node_builtin;
b->builtin = func;
b->subnode = p;
b->source_line = __LINE__;
b->source_file = __FILE__;
f = node(p, Node_func, b);
f->parmlist = vnames;
install(name, f);
}
/* get_argument --- Get the n'th argument of a dynamically linked function */
NODE *
get_argument(NODE *tree, int i)
{
extern NODE **stack_ptr;
int actual_args;
actual_args = get_curfunc_arg_count();
if (i < 0 || i >= tree->param_cnt || i >= actual_args)
return NULL;
tree = stack_ptr[i];
if (tree->type == Node_array_ref)
tree = tree->orig_array;
if (tree->type == Node_var_new || tree->type == Node_var_array)
return tree;
return tree->lnode;
}
/* get_actual_argument --- get a scalar or array, allowed to be optional */
NODE *
get_actual_argument(NODE *tree, unsigned int i, int optional, int want_array)
{
/* optional : if TRUE and i th argument not present return NULL, else fatal. */
NODE *t;
t = get_argument(tree, i);
if (t == NULL) {
if (i >= tree->param_cnt) /* must be fatal */
fatal(_("function `%s' defined to take no more than %d argument(s)"),
tree->param, tree->param_cnt);
if (! optional)
fatal(_("function `%s': missing argument #%d"),
tree->param, i + 1);
return NULL;
}
if (t->type == Node_var_new)
return (want_array ? get_array(t) : tree_eval(t));
if (want_array) {
if (t->type != Node_var_array)
fatal(_("function `%s': argument #%d: attempt to use scalar as an array"),
tree->param, i + 1);
} else {
if (t->type != Node_val)
fatal(_("function `%s': argument #%d: attempt to use array as a scalar"),
tree->param, i + 1);
}
return t;
}
/* set_value --- set the return value of a dynamically linked function */
void
set_value(NODE *tree)
{
extern NODE *ret_node;
if (tree)
ret_node = tree;
else
ret_node = Nnull_string;
}
#else
/* do_ext --- dummy version if extensions not available */
NODE *
do_ext(NODE *tree)
{
const char *emsg = _("Operation Not Supported");
unref(ERRNO_node->var_value);
ERRNO_node->var_value = make_string((char *) emsg, strlen(emsg));
return tmp_number((AWKNUM) -1);
}
#endif
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