2 files changed, 23 insertions, 2 deletions
diff --git a/src/utils/string.c b/src/utils/string.c
index 81be415..e01d1b6 100644
--- a/src/utils/string.c
+++ b/src/utils/string.c
@@ -1,5 +1,6 @@
 #include "string.h"
 
+#include <stdint.h>
 #include <string.h>
 
 size_t searchInStringArray(const char *array[], size_t array_size,
@@ -12,3 +13,20 @@ size_t searchInStringArray(const char *array[], size_t array_size,
   }
   return array_size;
 }
+
+uint64_t decimalToU64(char *str_begin, char *str_end, bool *success) {
+  uint64_t result = 0;
+
+  while (str_begin < str_end) {
+    if (*str_begin < '0' || *str_begin > '9') {
+      *success = false;
+      return 0;
+    }
+    result *= 10;
+    result += *str_begin - '0';
+    str_begin += 1;
+  }
+
+  *success = true;
+  return result;
+}
diff --git a/src/utils/string.h b/src/utils/string.h
index 79af8a9..7d0a5c8 100644
--- a/src/utils/string.h
+++ b/src/utils/string.h
@@ -1,6 +1,9 @@
 #pragma once
 
 #include <stddef.h>
+#include <stdint.h>
 
-size_t searchInStringArray(const char *array[], size_t array_size, const char *str,
-                           size_t str_size);
+size_t searchInStringArray(const char *array[], size_t array_size,
+                           const char *str, size_t str_size);
+
+uint64_t decimalToU64(char *str_begin, char *str_end, bool *success);