From 4492173466fd72037bd6d74402030b62e4f3a73f Mon Sep 17 00:00:00 2001
From: Paul Dersey <pdersey@gmail.com>
Date: Fri, 22 Jan 2021 10:56:36 -0500
Subject: [PATCH] Mes C Library: stdlib/qsort.c: Fix qswap segfault.

* stdlib/qsort.c (qswap): Remove hard coded buffer size.  Allow
swapping of objects of arbitrary size.
---
 lib/stdlib/qsort.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/lib/stdlib/qsort.c b/lib/stdlib/qsort.c
index 4f3e61cb..68352f5c 100644
--- a/lib/stdlib/qsort.c
+++ b/lib/stdlib/qsort.c
@@ -1,6 +1,7 @@
 /* -*-comment-start: "//";comment-end:""-*-
  * GNU Mes --- Maxwell Equations of Software
  * Copyright © 2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ * Copyright © 2021 Paul Dersey <pdersey@gmail.com>
  *
  * This file is part of GNU Mes.
  *
@@ -24,10 +25,14 @@
 void
 qswap (void *a, void *b, size_t size)
 {
-  char *buf[8];
-  memcpy (buf, a, size);
-  memcpy (a, b, size);
-  memcpy (b, buf, size);
+  char *pa = a;
+  char *pb = b;
+  do
+  {
+    char tmp = *pa;
+    *pa++ = *pb;
+    *pb++ = tmp;
+  } while (--size > 0);
 }
 
 size_t