From 11da511c784eca003deb90c23570f0873954e0de Mon Sep 17 00:00:00 2001
From: Duncan Wilkie <antigravityd@gmail.com>
Date: Sat, 18 Nov 2023 06:11:09 -0600
Subject: Initial commit.

---
 gmp-6.3.0/mpq/inv.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 gmp-6.3.0/mpq/inv.c

(limited to 'gmp-6.3.0/mpq/inv.c')

diff --git a/gmp-6.3.0/mpq/inv.c b/gmp-6.3.0/mpq/inv.c
new file mode 100644
index 0000000..c395984
--- /dev/null
+++ b/gmp-6.3.0/mpq/inv.c
@@ -0,0 +1,70 @@
+/* mpq_inv(dest,src) -- invert a rational number, i.e. set DEST to SRC
+   with the numerator and denominator swapped.
+
+Copyright 1991, 1994, 1995, 2000, 2001, 2012 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of either:
+
+  * the GNU Lesser General Public License as published by the Free
+    Software Foundation; either version 3 of the License, or (at your
+    option) any later version.
+
+or
+
+  * the GNU General Public License as published by the Free Software
+    Foundation; either version 2 of the License, or (at your option) any
+    later version.
+
+or both in parallel, as here.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received copies of the GNU General Public License and the
+GNU Lesser General Public License along with the GNU MP Library.  If not,
+see https://www.gnu.org/licenses/.  */
+
+#include "gmp-impl.h"
+
+void
+mpq_inv (mpq_ptr dest, mpq_srcptr src)
+{
+  mp_size_t num_size = SIZ(NUM(src));
+  mp_size_t den_size = SIZ(DEN(src));
+
+  if (num_size < 0)
+    {
+      num_size = -num_size;
+      den_size = -den_size;
+    }
+  else if (UNLIKELY (num_size == 0))
+    DIVIDE_BY_ZERO;
+
+  SIZ(DEN(dest)) = num_size;
+  SIZ(NUM(dest)) = den_size;
+
+  /* If dest == src we may just swap the numerator and denominator;
+     we ensured that the new denominator is positive.  */
+
+  if (dest == src)
+    {
+      MP_PTR_SWAP (PTR(NUM(dest)), PTR(DEN(dest)));
+      MP_SIZE_T_SWAP (ALLOC(NUM(dest)), ALLOC(DEN(dest)));
+    }
+  else
+    {
+      mp_ptr dp;
+
+      den_size = ABS (den_size);
+      dp = MPZ_NEWALLOC (NUM(dest), den_size);
+      MPN_COPY (dp, PTR(DEN(src)), den_size);
+
+      dp = MPZ_NEWALLOC (DEN(dest), num_size);
+      MPN_COPY (dp, PTR(NUM(src)), num_size);
+    }
+}
-- 
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