1 files changed, 43 insertions, 1 deletions

diff --git a/bcsh.c b/bcsh.c
index 8e0dd32..6830671 100644
--- a/bcsh.c
+++ b/bcsh.c
@@ -9,12 +9,54 @@ int main(int argc, char **argv) {
     return 0;
 }
 
+Command *newcmd() {
+    Command *cmd = (Command *)malloc(sizeof(Command));
+    cmd->argc = 0;
+    cmd->args = NULL;
+    cmd->type = CMD_TYPE_NORMAL;
+    cmd->left = NULL;
+    cmd->right = NULL;
+    return cmd;
+}
+
 int runcmd(Command *cmd) {
     int i;
     if (cmd == NULL) {
         fprintf(stderr, "cmd is NULL\n");
+    } else if (cmd->type != CMD_TYPE_NORMAL) {
+        runcmd(cmd->left);
+        runcmd(cmd->right);
+        return 0;
+    }
+    printcmd(cmd);
+    if (!strcmp(cmd->args[0], "exit")) {
+        freecmd(cmd);
+        exit(0);
+    }
+    freecmd(cmd);
+    return 0;
+}
+
+void freecmd(Command *cmd) {
+    if (cmd == NULL) {
+        return;
     }
-    printf("Run cmd: ");
+    if (cmd->left != NULL) {
+        freecmd(cmd->left);
+    }
+    if (cmd->right != NULL) {
+        freecmd(cmd->right);
+    }
+    int i;
+    for (i = 0; i < cmd->argc; i++) {
+        free(cmd->args[i]);
+    }
+    free(cmd->args);
+    free(cmd);
+}
+
+void printcmd(Command *cmd) {
+    int i;
     for (i = 0; i < cmd->argc; i++) {
         printf("%s ", cmd->args[i]);
     }