1 files changed, 24 insertions, 0 deletions
diff --git a/src/proone_util.c b/src/proone_util.c
new file mode 100644
index 0000000..118dc35
--- /dev/null
+++ b/src/proone_util.c
@@ -0,0 +1,24 @@
+#include "proone_util.h"
+
+
+void proone_rnd_alphanumeric_str (proone_rnd_engine_t *rnd_engine, char *str, const size_t len) {
+	static const char SET[] = "qwertyuiopasdfghjklzxcvbnm0123456789";
+	size_t i = 0;
+	uint32_t n;
+
+	if (len >= 4) {
+		for (; i < len / 4 * 4; i += 4) {
+			n = proone_rnd_gen_int(rnd_engine);
+			str[i + 0] = SET[((uint8_t*)&n)[0] % sizeof(SET)];
+			str[i + 1] = SET[((uint8_t*)&n)[1] % sizeof(SET)];
+			str[i + 2] = SET[((uint8_t*)&n)[2] % sizeof(SET)];
+			str[i + 3] = SET[((uint8_t*)&n)[3] % sizeof(SET)];
+		}
+	}
+	if (i < len) {
+		n = proone_rnd_gen_int(rnd_engine);
+		for (; i < len; i += 1) {
+			str[i] = SET[((uint8_t*)&n)[i % 4] % sizeof(SET)];
+		}
+	}
+}