1 files changed, 59 insertions, 0 deletions
diff --git a/rushs/tinyprintf/rotx/rotx.c b/rushs/tinyprintf/rotx/rotx.c
new file mode 100644
index 0000000..a2cb820
--- /dev/null
+++ b/rushs/tinyprintf/rotx/rotx.c
@@ -0,0 +1,59 @@
+#include <stdlib.h>
+#include <unistd.h>
+
+#define BUFFER_SIZE 10
+
+int main(int argc, char **argv)
+{
+    if (argc != 2)
+    {
+        return 0;
+    }
+
+    int rot = atoi(argv[1]);
+    int rod = rot;
+    if (rot < 0)
+    {
+        rot = (rot % 26) + 26;
+        rod = (rod % 10) + 10;
+    }
+
+    char buf[BUFFER_SIZE];
+    ssize_t r;
+
+    while ((r = read(STDIN_FILENO, buf, BUFFER_SIZE)))
+    {
+        if (r == -1)
+        {
+            return 1;
+        }
+
+        for (ssize_t i = 0; i < r; i++)
+        {
+            if (buf[i] >= 'a' && buf[i] <= 'z')
+            {
+                buf[i] = ((buf[i] - 'a') + rot) % 26 + 'a';
+            }
+            else if (buf[i] >= 'A' && buf[i] <= 'Z')
+            {
+                buf[i] = ((buf[i] - 'A') + rot) % 26 + 'A';
+            }
+            else if (buf[i] >= '0' && buf[i] <= '9')
+            {
+                buf[i] = ((buf[i] - '0') + rod) % 10 + '0';
+            }
+        }
+
+        ssize_t w = write(STDOUT_FILENO, buf, r);
+        while (w != r)
+        {
+            w += write(STDOUT_FILENO, buf, r);
+            if (w == -1)
+            {
+                return 1;
+            }
+        }
+    }
+
+    return 0;
+}