icalss/icalgauge - handle NULL arg to icalgauge_get_expand

don't crash on a NULL arg. found by cppcheck

2 files changed, 8 insertions, 1 deletions

diff --git a/src/libicalss/icalgauge.c b/src/libicalss/icalgauge.c
index 6697ac53..3c8be5d8 100644
--- a/src/libicalss/icalgauge.c
+++ b/src/libicalss/icalgauge.c
@@ -67,7 +67,10 @@ icalgauge *icalgauge_new_from_sql(const char *sql, int expand)
 
 int icalgauge_get_expand(icalgauge *gauge)
 {
-    return (gauge->expand);
+    if (gauge != 0) {
+        return gauge->expand;
+    }
+    return -1;
 }
 
 void icalgauge_free(icalgauge *gauge)
diff --git a/src/libicalss/icalgauge.h b/src/libicalss/icalgauge.h
index f59691a3..48f99e5d 100644
--- a/src/libicalss/icalgauge.h
+++ b/src/libicalss/icalgauge.h
@@ -34,6 +34,10 @@ typedef struct icalgauge_impl icalgauge;
 
 LIBICAL_ICALSS_EXPORT icalgauge *icalgauge_new_from_sql(const char *sql, int expand);
 
+/**
+ * Returns the expand value for the specified icalgauge.
+ * If @p gauge is NULL a value of -1 is returned.
+ */
 LIBICAL_ICALSS_EXPORT int icalgauge_get_expand(icalgauge *gauge);
 
 LIBICAL_ICALSS_EXPORT void icalgauge_free(icalgauge *gauge);