1 files changed, 11 insertions, 0 deletions
diff --git a/src/zneg.c b/src/zneg.c
new file mode 100644
index 0000000..a22d58c
--- /dev/null
+++ b/src/zneg.c
@@ -0,0 +1,11 @@
+/* See LICENSE file for copyright and license details. */
+#include "internals"
+
+
+void
+zneg(z_t a, z_t b)
+{
+	if (a != b)
+		zset(a, b);
+	SET_SIGNUM(a, -zsignum(a));
+}