X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/09d00c6bc88fe624f00ef13b0930b8cc0b6300c1..75263f25a1ce8e7b38ad4bd61a9a893723ec1db3:/mp-arith.c

diff --git a/mp-arith.c b/mp-arith.c
index e47f301..759056b 100644
--- a/mp-arith.c
+++ b/mp-arith.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: mp-arith.c,v 1.13 2002/10/15 00:19:40 mdw Exp $
+ * $Id: mp-arith.c,v 1.15 2002/10/19 17:56:50 mdw Exp $
  *
  * Basic arithmetic on multiprecision integers
  *
@@ -30,6 +30,12 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: mp-arith.c,v $
+ * Revision 1.15  2002/10/19 17:56:50  mdw
+ * Fix bit operations.  Test them (a bit) better.
+ *
+ * Revision 1.14  2002/10/15 19:18:31  mdw
+ * New operation to negate numbers.
+ *
  * Revision 1.13  2002/10/15 00:19:40  mdw
  * Bit setting and clearing functions.
  *
@@ -271,6 +277,31 @@ int mp_cmp(const mp *a, const mp *b)
     return (+1);
 }
 
+/* --- @mp_neg@ --- *
+ *
+ * Arguments:	@mp *d@ = destination
+ *		@mp *a@ = argument
+ *
+ * Returns:	The negation of the argument.
+ *
+ * Use:		Negates its argument.
+ */
+
+mp *mp_neg(mp *d, mp *a)
+{
+  /* --- Surprising amounts of messing about required --- */
+
+  MP_SHRINK(a);
+  MP_COPY(a);
+  if (d) MP_DROP(d);
+  if (a->v == a->vl) {
+    return (a);
+  }
+  MP_DEST(a, MP_LEN(a), a->f);
+  a->f ^= MP_NEG;
+  return (a);
+}
+
 /* --- @mp_bitop@ --- *
  *
  * Arguments:	@mp *d@ = destination
@@ -290,7 +321,7 @@ int mp_cmp(const mp *a, const mp *b)
 									\
 mp *mp_bit##string(mp *d, mp *a, mp *b)					\
 {									\
-  MP_DEST(d, MAX(MP_LEN(a), MP_LEN(b)), a->f | b->f);			\
+  MP_DEST(d, MAX(MP_LEN(a), MP_LEN(b)), (a->f | b->f) & ~MP_NEG);	\
   mpx_bit##string(d->v, d->vl, a->v, a->vl, b->v, b->vl);		\
   d->f = (a->f | b->f) & MP_BURN;					\
   MP_SHRINK(d);								\
@@ -850,6 +881,36 @@ static int tclr(dstr *v)
   return (ok);
 }
 
+static int tneg(dstr *v)
+{
+  mp *a = *(mp **)v[0].buf;
+  mp *r = *(mp **)v[1].buf;
+  int ok = 1;
+  mp *n = mp_neg(MP_NEW, a);
+  if (!MP_EQ(r, n)) {
+    ok = 0;
+    fprintf(stderr, "\n*** neg failed\n");
+    fputs("\n*** a  = ", stderr); mp_writefile(a, stderr, 10);
+    fputs("\n*** r  = ", stderr); mp_writefile(r, stderr, 10);
+    fputs("\n*** n  = ", stderr); mp_writefile(n, stderr, 10);
+    fputc('\n', stderr);
+  }
+  mp_drop(n);
+  n = mp_neg(a, a);
+  if (!MP_EQ(r, n)) {
+    ok = 0;
+    fprintf(stderr, "\n*** neg failed\n");
+    fputs("\n*** a* = ", stderr); mp_writefile(a, stderr, 10);
+    fputs("\n*** r  = ", stderr); mp_writefile(r, stderr, 10);
+    fputs("\n*** n  = ", stderr); mp_writefile(n, stderr, 10);
+    fputc('\n', stderr);
+  }
+  mp_drop(a);
+  mp_drop(r);
+  assert(mparena_count(MPARENA_GLOBAL) == 0);
+  return (ok);  
+}
+
 static int todd(dstr *v)
 {
   mp *a = *(mp **)v[0].buf;
@@ -889,6 +950,7 @@ static test_chunk tests[] = {
   { "div", tdiv, { &type_mp, &type_mp, &type_mp, &type_mp, 0 } },
   { "bin2c", tbin, { &type_string, &type_mp, &type_mp, &type_mp, 0 } },
   { "odd", todd, { &type_mp, &type_uint32, &type_mp, 0 } },
+  { "neg", tneg, { &type_mp, &type_mp, 0 } },
   { 0, 0, { 0 } },
 };