commit files needed for zpm-fetchurl

[zpackage] / tomsfastmath / src / mul / fp_mul_d.c

diff --git a/tomsfastmath/src/mul/fp_mul_d.c b/tomsfastmath/src/mul/fp_mul_d.c
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+++ b/tomsfastmath/src/mul/fp_mul_d.c
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+/* TomsFastMath, a fast ISO C bignum library.
+ * 
+ * This project is meant to fill in where LibTomMath
+ * falls short.  That is speed ;-)
+ *
+ * This project is public domain and free for all purposes.
+ * 
+ * Tom St Denis, tomstdenis@gmail.com
+ */
+#include <tfm_private.h>
+
+/* c = a * b */
+void fp_mul_d(fp_int *a, fp_digit b, fp_int *c)
+{
+   fp_word  w;
+   int      x, oldused;
+
+   oldused = c->used;
+   c->used = a->used;
+   c->sign = a->sign;
+   w       = 0;
+   for (x = 0; x < a->used; x++) {
+       w         = ((fp_word)a->dp[x]) * ((fp_word)b) + w;
+       c->dp[x]  = (fp_digit)w;
+       w         = w >> DIGIT_BIT;
+   }
+   if (w != 0 && (a->used != FP_SIZE)) {
+      c->dp[c->used++] = w;
+      ++x;
+   }
+   for (; x < oldused; x++) {
+      c->dp[x] = 0;
+   }
+   fp_clamp(c);
+}
+
+
+/* $Source$ */
+/* $Revision$ */
+/* $Date$ */