20060303a

1 files changed, 49 insertions, 0 deletions

diff --git a/libmp/port/mptouv.c b/libmp/port/mptouv.c
new file mode 100644
index 00000000..1efdff95
--- /dev/null
+++ b/libmp/port/mptouv.c
@@ -0,0 +1,49 @@
+#include "os.h"
+#include <mp.h>
+#include "dat.h"
+
+#define VLDIGITS (sizeof(vlong)/sizeof(mpdigit))
+
+/*
+ *  this code assumes that a vlong is an integral number of
+ *  mpdigits long.
+ */
+mpint*
+uvtomp(uvlong v, mpint *b)
+{
+	int s;
+
+	if(b == nil)
+		b = mpnew(VLDIGITS*sizeof(mpdigit));
+	else
+		mpbits(b, VLDIGITS*sizeof(mpdigit));
+	mpassign(mpzero, b);
+	if(v == 0)
+		return b;
+	for(s = 0; s < VLDIGITS && v != 0; s++){
+		b->p[s] = v;
+		v >>= sizeof(mpdigit)*8;
+	}
+	b->top = s;
+	return b;
+}
+
+uvlong
+mptouv(mpint *b)
+{
+	uvlong v;
+	int s;
+
+	if(b->top == 0)
+		return 0;
+
+	mpnorm(b);
+	if(b->top > VLDIGITS)
+		return MAXVLONG;
+
+	v = 0;
+	for(s = 0; s < b->top; s++)
+		v |= b->p[s]<<(s*sizeof(mpdigit)*8);
+
+	return v;
+}