CE add mkdir command, implement create_dir () syscall

ce/interp.c

@@ -49,6 +49,30 @@ static void mkfile (struct context* context, char** file_paths, size_t files_cou
   }
 }
 
+static void mkdir (struct context* context, char** dir_paths, size_t dirs_count) {
+  char volume[VOLUME_MAX];
+  const char* path;
+  int ret;
+
+  for (size_t i = 0; i < dirs_count; i++) {
+    const char* dir_path = dir_paths[i];
+
+    if (!path_parse (dir_path, volume, &path)) {
+      cprintf (context, "ERROR bad path '%s'\n", dir_path);
+      continue;
+    }
+
+    if ((ret = volume_open (volume)) < 0) {
+      cprintf (context, "ERROR could not open volume '%s': %s\n", volume, str_status[-ret]);
+      continue;
+    }
+
+    create_dir (path);
+
+    volume_close ();
+  }
+}
+
 static void cat (struct context* context, char** file_paths, size_t files_count) {
   char volume[VOLUME_MAX];
   const char* path;
@@ -153,6 +177,7 @@ static void help (struct context* context) {
   cprintf (context, "cat <file path>\n");
   cprintf (context, "ls <directory path>\n");
   cprintf (context, "mkfile <file path>\n");
+  cprintf (context, "mkdir <directory path>\n");
   cprintf (context, "quit\n");
 }
 
@@ -185,6 +210,8 @@ static void execute_cmd (struct ast_cmd* cmd, struct context* context) {
     quit1 (context);
   } else if (strcmp (cmd->name, "mkfile") == 0) {
     mkfile (context, cmd->args, cmd->arg_count);
+  } else if (strcmp (cmd->name, "mkdir") == 0) {
+    mkdir (context, cmd->args, cmd->arg_count);
   } else {
     /* cprintf (context, "ERROR unknown command '%s'\n", cmd->name); */
     char volume[VOLUME_MAX];