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authorLaurent Bercot <ska-skaware@skarnet.org>2014-09-18 18:55:44 +0000
committerLaurent Bercot <ska-skaware@skarnet.org>2014-09-18 18:55:44 +0000
commit3534b428629be185e096be99e3bd5fdfe32d5544 (patch)
tree210ef3198ed66bc7f7b7bf6a85e4579f455e5a36 /src/libbiguint/bu_slbc.c
downloadskalibs-3534b428629be185e096be99e3bd5fdfe32d5544.tar.xz
initial commit with rc for skalibs-2.0.0.0
Diffstat (limited to 'src/libbiguint/bu_slbc.c')
-rw-r--r--src/libbiguint/bu_slbc.c17
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 ;
+}