removed pdclib, strange things were happening..., user shell kinda works now

programs/rocksh/main.c

@@ -0,0 +1,46 @@
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+
+const char* shell_prompt = "rocksh> ";
+
+static void process_cmd(const char* cmd) {
+    size_t cmd_len = strlen(cmd);
+    if (cmd_len < 1) {
+        return;
+    }
+
+    if (strcmp(cmd, "exit") == 0) {
+        printf("bye!\n");
+        exit(0);
+    }
+
+    printf("command not recognized: %s\n", cmd);
+}
+
+int main(int argc, char *argv[]) {
+    (void)argc;
+    (void)argv;
+
+    char cmd[128];
+    size_t p = 0;
+    
+    printf("%s", shell_prompt);
+
+    while (1) {
+        char c = getchar();
+        printf("%c", c);
+        if (c != '\n') {
+            cmd[p++] = c;
+            continue;
+        }
+
+        cmd[p] = 0;
+        process_cmd(cmd);
+        memset(cmd, 0, 128);
+        p = 0;
+        printf("%s", shell_prompt);
+    }
+    
+    return 0;
+}