Move to gawk-3.1.0.

1 files changed, 186 insertions, 0 deletions

diff --git a/ext.c b/ext.c
new file mode 100644
index 00000000..1ed7e2d4
--- /dev/null
+++ b/ext.c
@@ -0,0 +1,186 @@
+/*
+ * 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 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"
+
+#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 buf[200];
+	int space_needed, i;
+
+	/* 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->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->proc = 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;
+
+	if (i < 0 || i >= tree->param_cnt)
+		return NULL;
+
+	tree = stack_ptr[i];
+	if (tree->lnode == Nnull_string)
+		return NULL;
+
+	if (tree->type == Node_array_ref)
+		tree = tree->orig_array;
+
+	if (tree->type == Node_var_array)
+		return tree;
+
+	return tree->lnode;
+}
+
+/* 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)
+{
+	char *emsg = _("Operation Not Supported");
+
+	unref(ERRNO_node->var_value);
+	ERRNO_node->var_value = make_string(emsg, strlen(emsg));
+	return tmp_number((AWKNUM) -1);
+}
+#endif