A libcedos/stdlib.c

@@ -0,0 +1,23 @@
+#include "stdlib.h"
+
+int atoi (const char * str) {
+    int res = 0;
+    int sign = 1;
+    int i = 0;
+
+    if (str[0] == '+') {
+        sign = 1;
+        i = 1;
+    } else if (str[0] == '-') {
+        sign == -1;
+        i = 1;
+    } else if (str[0] < '0' || str[0] > '9') {
+        return 0;
+    }
+
+    while (str[i] >= '0' && str[i] <= '9') {
+        res = 10 * res + (str[i++] - '0');
+    }
+
+    return res;
+}

M libcedos/stdlib.h → libcedos/stdlib.h

@@ -41,4 +41,6 @@ */
 void free(void* ptr);
 
 
+int atoi (const char * str);
+
 #endif