1 files changed, 64 insertions, 0 deletions
diff --git a/sys/cmd/rc/word.c b/sys/cmd/rc/word.c
new file mode 100644
index 0000000..84ff40c
--- /dev/null
+++ b/sys/cmd/rc/word.c
@@ -0,0 +1,64 @@
+#include "rc.h"
+
+void
+pushlist(void)
+{
+    List *ls;
+
+    alloc(ls);
+    ls->words = nil;
+    ls->link  = shell->stack, shell->stack = ls; 
+}
+
+void
+freelist(Word *w)
+{
+    Word *it;
+    while (w) {
+        it = w->link;
+        efree(w->word);
+        efree(w);
+        w  = it;
+    }
+}
+
+void
+poplist(void)
+{
+    List *ls = shell->stack;
+    if (!ls) 
+        panicf("shell stack underflow");
+
+    freelist(ls->words);
+    shell->stack = ls->link;
+    efree(ls);
+}
+
+int
+count(Word *w)
+{
+    int n;
+    for (n=0; w; n++)
+        w = w->link;
+    return n;
+}
+
+Word*
+newword(char *w, Word *link)
+{
+    Word *wd;
+    
+    alloc(wd);
+    wd->word = strdup(w);
+    wd->link = link;
+
+    return wd;
+}
+
+void
+pushword(char *w)
+{
+    if (shell->stack == nil)
+        panicf("no active stack");
+    shell->stack->words = newword(w, shell->stack->words);
+}