1 files changed, 35 insertions, 0 deletions
diff --git a/tools/util.c b/tools/util.c
new file mode 100644
index 0000000..f2ef5fd
--- /dev/null
+++ b/tools/util.c
@@ -0,0 +1,35 @@
+#include <stdlib.h>
+#include <errno.h>
+
+#include "util.h"
+
+/*
+ * Safer wrapper of strtoll. Return 0 on success, otherwise -1.
+ * Idea from corosync-qdevice project
+ */
+int
+util_strtonum(const char *str, long long int min_val, long long int max_val,
+    long long int *res)
+{
+        long long int tmp_ll;
+        char *ep;
+
+        if (min_val > max_val) {
+                return (-1);
+        }
+
+        errno = 0;
+
+        tmp_ll = strtoll(str, &ep, 10);
+        if (ep == str || *ep != '\0' || errno != 0) {
+                return (-1);
+        }
+
+        if (tmp_ll < min_val || tmp_ll > max_val) {
+                return (-1);
+        }
+
+        *res = tmp_ll;
+
+        return (0);
+}