1 files changed, 22 insertions, 0 deletions
diff --git a/lib/hitomezashi_utils.c b/lib/hitomezashi_utils.c
new file mode 100644
index 0000000..32832de
--- /dev/null
+++ b/lib/hitomezashi_utils.c
@@ -0,0 +1,22 @@
+#include "hitomezashi_utils.h"
+
+#include <stddef.h>
+#include <stdlib.h>
+
+char *hitomezashi_ascii_binary_str_to_ints(char *ascii_str, size_t len) {
+  char *res = malloc(len);
+  for (int i = 0; i < len; ++i) {
+    switch (ascii_str[i]) {
+    case '0':;
+      res[i] = 0;
+      break;
+    case '1':;
+      res[i] = 1;
+      break;
+    default:;
+      free(res);
+      return NULL;
+    }
+  }
+  return res;
+}