From fcedfddf00b3f994e4f4e40332ac7fc192c63244 Mon Sep 17 00:00:00 2001
From: polwex <polwex@sortug.com>
Date: Sun, 5 Oct 2025 21:56:51 +0700
Subject: claude is gud

---
 vere/pkg/noun/jets/a/sub.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 vere/pkg/noun/jets/a/sub.c

(limited to 'vere/pkg/noun/jets/a/sub.c')

diff --git a/vere/pkg/noun/jets/a/sub.c b/vere/pkg/noun/jets/a/sub.c
new file mode 100644
index 0000000..321ba77
--- /dev/null
+++ b/vere/pkg/noun/jets/a/sub.c
@@ -0,0 +1,67 @@
+/// @file
+
+#include "jets/k.h"
+#include "jets/q.h"
+#include "jets/w.h"
+
+#include "noun.h"
+
+u3_noun
+u3qa_sub(u3_atom a,
+         u3_atom b)
+{
+  if ( _(u3a_is_cat(a)) && _(u3a_is_cat(b)) ) {
+    if ( a < b ) {
+      return u3m_error("subtract-underflow");
+    }
+    else {
+      return (a - b);
+    }
+  }
+  else if ( 0 == b ) {
+    return u3k(a);
+  }
+  else {
+    mpz_t a_mp, b_mp;
+
+    u3r_mp(a_mp, a);
+    u3r_mp(b_mp, b);
+
+    if ( mpz_cmp(a_mp, b_mp) < 0 ) {
+      mpz_clear(a_mp);
+      mpz_clear(b_mp);
+
+      return u3m_error("subtract-underflow");
+    }
+    mpz_sub(a_mp, a_mp, b_mp);
+    mpz_clear(b_mp);
+
+    return u3i_mp(a_mp);
+  }
+}
+
+u3_noun
+u3wa_sub(u3_noun cor)
+{
+  u3_noun a, b;
+
+  if ( (c3n == u3r_mean(cor, u3x_sam_2, &a, u3x_sam_3, &b, 0)) ||
+       (c3n == u3ud(b)) ||
+       (c3n == u3ud(a)) )
+  {
+    return u3m_bail(c3__fail);
+  }
+  else {
+    return u3qa_sub(a, b);
+  }
+}
+
+u3_noun
+u3ka_sub(u3_noun a,
+         u3_noun b)
+{
+  u3_noun c = u3qa_sub(a, b);
+
+  u3z(a); u3z(b);
+  return c;
+}
-- 
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