1 files changed, 17 insertions, 0 deletions
diff --git a/src/libbiguint/bu_slbc.c b/src/libbiguint/bu_slbc.c
new file mode 100644
index 0000000..081c599
--- /dev/null
+++ b/src/libbiguint/bu_slbc.c
@@ -0,0 +1,17 @@
+/* ISC license. */
+
+#include <skalibs/uint32.h>
+#include <skalibs/biguint.h>
+
+int bu_slbc (register uint32 *a, register unsigned int n, register int carry)
+{
+  register unsigned int i = 0 ;
+  carry = !!carry ;
+  for (; i < n ; i++)
+  {
+    register int c = a[i] >> 31 ;
+    a[i] = (a[i] << 1) | carry ;
+    carry = c ;
+  }
+  return carry ;
+}