1 files changed, 38 insertions, 0 deletions
diff --git a/utils.c b/utils.c
new file mode 100644
index 0000000..fa97087
--- /dev/null
+++ b/utils.c
@@ -0,0 +1,38 @@
+#include <stdint.h>
+
+#include "types.h"
+
+uint64_t str_to_unsigned(struct string str, uint8_t *err) {
+	if (str.len == 0) {
+		*err = 1;
+		return 0;
+	}
+
+	uint64_t val = 0;
+	while (str.len > 0) {
+		switch(str.data[0]) {
+		case '0':
+		case '1':
+		case '2':
+		case '3':
+		case '4':
+		case '5':
+		case '6':
+		case '7':
+		case '8':
+		case '9':
+			val *= 10;
+			val += str.data[0] - 0x30;
+			break;
+		default:
+			*err = 1;
+			return 0;
+		}
+
+		str.data++;
+		str.len--;
+	}
+
+	*err = 0;
+	return val;
+}