Feat(rc): added subshell commands and cd builtin

Slowly chipping away at a decent feature list.
Subshell commands are executed by @{ ... }.

1 files changed, 12 insertions, 0 deletions

diff --git a/sys/cmd/rc/code.c b/sys/cmd/rc/code.c
index 719e63b..38cc06a 100644
--- a/sys/cmd/rc/code.c
+++ b/sys/cmd/rc/code.c
@@ -110,6 +110,18 @@ walk(Tree *node)
         storepc(addr);
         break;
 
+    case Tsubshell:
+        emitf(Xsubshell);
+        addr = emiti(0);
+        walk(node->child[0]);
+        emitf(Xexit);
+        storepc(addr);
+        break;
+
+    case Tbang:
+        walk(node->child[0]);
+        emitf(Xbang);
+
     case Tword:
         emitf(Xword);
         emits(strdup(node->str));