1 files changed, 28 insertions, 0 deletions
diff --git a/src/utils.c b/src/utils.c
index d49a9ac..2607fc6 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -7,7 +7,12 @@
  * (at your option) any later version.
  */
 
+
 #include <ctype.h>
+#include <errno.h>
+#include <assert.h>
+#include <limits.h>
+#include <stdlib.h>
 #include "utils.h"
 
 void str_toupper(char *str)
@@ -29,3 +34,26 @@ void str_tolower(char *str)
                c++;
        }
 }
+
+int safe_strtoull(const char *str, uint64_t *out_value, int base, uint64_t max)
+{
+        char *endptr = NULL;
+        uint64_t result;
+        errno = 0;
+
+        assert(str != NULL && out_value != NULL);
+
+        if (str[0] == '-')
+                return -1;
+
+        result = strtoull(str, &endptr, base);
+
+        if (endptr == str ||
+            *endptr != '\0' ||
+            (errno == ERANGE && result == ULLONG_MAX) ||
+            result > max)
+                return -1;
+
+        *out_value = result;
+        return 0;
+}