1 files changed, 71 insertions, 0 deletions
diff --git a/gamma/eval.c b/gamma/eval.c
new file mode 100644
index 0000000..1702ea0
--- /dev/null
+++ b/gamma/eval.c
@@ -0,0 +1,71 @@
+/* This file is part of Gamma.
+   Copyright (C) 2010, 2015 Sergey Poznyakoff
+
+   Gamma 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 3, or (at your option)
+   any later version.
+
+   Gamma 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 Gamma.  If not, see <http://www.gnu.org/licenses/>. */
+
+#include "gamma-expat.h"
+
+
+/* General-purpose eval handlers */
+
+SCM
+gamma_eval_catch_body(void *list)
+{
+	return scm_primitive_eval((SCM)list);
+}
+
+static SCM
+eval_catch_handler (void *data, SCM tag, SCM throw_args)
+{
+	scm_handle_by_message_noexit("gamma", tag, throw_args);
+	longjmp(*(jmp_buf*)data, 1);
+}
+
+struct scheme_exec_data {
+	SCM (*handler) (void *data);
+	void *data;
+};
+
+static SCM
+scheme_safe_exec_body (void *data)
+{
+	struct scheme_exec_data *ed = data;
+	return ed->handler(ed->data);
+}
+
+int
+gamma_safe_exec(SCM (*handler) (void *data), void *data, SCM *result)
+{
+	jmp_buf jmp_env;
+	struct scheme_exec_data ed;
+	SCM res;
+	
+	if (setjmp(jmp_env))
+		exit(70); /* EX_SOFTWARE */
+	ed.handler = handler;
+	ed.data = data;
+	res = scm_c_catch(SCM_BOOL_T,
+			  scheme_safe_exec_body, (void*)&ed,
+			  eval_catch_handler, &jmp_env, NULL, NULL);
+	if (result)
+		*result = res;
+	return 0;
+}
+
+char *
+gamma_proc_name(SCM proc)
+{
+	return scm_to_locale_string(
+		scm_symbol_to_string(scm_procedure_name(proc)));
+}