1 files changed, 35 insertions, 0 deletions
diff --git a/support.c b/support.c
new file mode 100644
index 0000000..cc0304f
--- /dev/null
+++ b/support.c
@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include <stdint.h>
+
+extern int32_t sp;
+extern int32_t stack;
+
+void emit()
+{
+    putchar(*(&stack + --sp));
+}
+
+void sub()
+{
+    int32_t *st = &stack;
+    st[sp - 2] -= st[sp - 1];
+    --sp;
+}
+
+void cswap()
+{
+    int32_t *st = &stack;
+    --sp;
+    if (st[sp]) {
+        int32_t tmp = st[sp - 1];
+        st[sp - 1] = st[sp - 2];
+        st[sp - 2] = tmp;
+    }
+}
+
+void eq()
+{
+    int32_t *st = &stack;
+    --sp;
+    st[sp - 1] = st[sp - 1] == st[sp];
+}