1 files changed, 47 insertions, 0 deletions
diff --git a/usr/src/tools/smatch/src/smatch_annotate.c b/usr/src/tools/smatch/src/smatch_annotate.c
new file mode 100644
index 0000000000..c027d1fa98
--- /dev/null
+++ b/usr/src/tools/smatch/src/smatch_annotate.c
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2013 Oracle.
+ *
+ * This program 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.
+ *
+ * This program 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, see http://www.gnu.org/copyleft/gpl.txt
+ */
+
+/*
+ * A place to add function annotations for common functions.
+ *
+ */
+
+#include "smatch.h"
+#include "smatch_extra.h"
+
+static int param_caps_return(struct expression *call, void *_arg, struct range_list **res)
+{
+	int arg = PTR_INT(_arg);
+	struct expression *expr;
+	struct range_list *rl;
+
+	expr = get_argument_from_call_expr(call->args, arg);
+	if (get_implied_rl(expr, &rl) && rl_max(rl).value != 0)
+		*res = alloc_rl(sval_type_val(rl_type(rl), 0), rl_max(rl));
+	return 1;
+}
+
+void register_annotate(int id)
+{
+	/*
+	 * Technically snprintf() returns the number of bytes which *would* have
+	 * been printed.  I do try caclulating that in check_snprintf().  But
+	 * it probably works better to assume the limitter is accurate.
+	 */
+	add_implied_return_hook("snprintf", &param_caps_return, INT_PTR(1));
+
+}