diff --git a/kernel/int.c b/kernel/int.c
new file mode 100644
index 0000000..0b60177
--- /dev/null
+++ b/kernel/int.c
@@ -0,0 +1,44 @@
+#include "int.h"
+
+unsigned long parse_u32(const char *s, int *ok) {
+    unsigned long value = 0;
+    *ok = 0;
+
+    if (!s || *s == '\0') {
+        return 0;
+    }
+
+    while (*s) {
+        if (*s < '0' || *s > '9') {
+            return 0;
+        }
+
+        value = value * 10UL + (unsigned long)(*s - '0');
+        ++s;
+    }
+
+    *ok = 1;
+    return value;
+}
+
+long parse_i32(const char *s, int *ok) {
+    int sign = 1;
+    unsigned long v;
+
+    if (!s || *s == '\0') {
+        *ok = 0;
+        return 0;
+    }
+
+    if (*s == '-') {
+        sign = -1;
+        ++s;
+    }
+
+    v = parse_u32(s, ok);
+    if (!*ok) {
+        return 0;
+    }
+
+    return (long)v * (long)sign;
+}
\ No newline at end of file