1 files changed, 42 insertions, 0 deletions
diff --git a/misc.c b/misc.c
new file mode 100644
index 0000000..ec38016
--- /dev/null
+++ b/misc.c
@@ -0,0 +1,42 @@
+/*
+ * misc.c: miscellaneous useful items
+ */
+
+#include "buttress.h"
+
+struct stackTag {
+    void **data;
+    int sp;
+    int size;
+};
+
+stack stk_new(void) {
+    stack s;
+
+    s = smalloc(sizeof(*s));
+    s->sp = 0;
+    s->size = 0;
+    s->data = NULL;
+
+    return s;
+}
+
+void stk_free(stack s) {
+    sfree(s->data);
+    sfree(s);
+}
+
+void stk_push(stack s, void *item) {
+    if (s->size <= s->sp) {
+	s->size = s->sp + 32;
+	s->data = srealloc(s->data, s->size * sizeof(*s->data));
+    }
+    s->data[s->sp++] = item;
+}
+
+void *stk_pop(stack s) {
+    if (s->sp > 0)
+	return s->data[--s->sp];
+    else
+	return NULL;
+}