--- a/libtommath/bn_mp_abs.c	Thu Mar 21 23:28:59 2019 +0800
+++ b/libtommath/bn_mp_abs.c	Fri Jun 26 21:07:34 2020 +0800
@@ -1,43 +1,26 @@
-#include <tommath_private.h>
+#include "tommath_private.h"
 #ifdef BN_MP_ABS_C
-/* LibTomMath, multiple-precision integer library -- Tom St Denis
- *
- * LibTomMath is a library that provides multiple-precision
- * integer arithmetic as well as number theoretic functionality.
- *
- * The library was designed directly after the MPI library by
- * Michael Fromberger but has been written from scratch with
- * additional optimizations in place.
- *
- * The library is free for all purposes without any express
- * guarantee it works.
- *
- * Tom St Denis, [email protected], http://libtom.org
- */
+/* LibTomMath, multiple-precision integer library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
 
-/* b = |a| 
+/* b = |a|
  *
  * Simple function copies the input and fixes the sign to positive
  */
-int
-mp_abs (mp_int * a, mp_int * b)
+mp_err mp_abs(const mp_int *a, mp_int *b)
 {
-  int     res;
+   mp_err     err;
 
-  /* copy a to b */
-  if (a != b) {
-     if ((res = mp_copy (a, b)) != MP_OKAY) {
-       return res;
-     }
-  }
+   /* copy a to b */
+   if (a != b) {
+      if ((err = mp_copy(a, b)) != MP_OKAY) {
+         return err;
+      }
+   }
 
-  /* force the sign of b to positive */
-  b->sign = MP_ZPOS;
+   /* force the sign of b to positive */
+   b->sign = MP_ZPOS;
 
-  return MP_OKAY;
+   return MP_OKAY;
 }
 #endif
-
-/* ref:         $Format:%D$ */
-/* git commit:  $Format:%H$ */
-/* commit time: $Format:%ai$ */