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Mes C Library: stdlib/qsort.c: Fix qswap segfault.

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* stdlib/qsort.c (qswap): Remove hard coded buffer size.  Allow
swapping of objects of arbitrary size.
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Paul Dersey 2021-01-22 10:56:36 -05:00 committed by Jan (janneke) Nieuwenhuizen
parent d3a039949b
commit 4492173466
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GPG key ID: F3C1A0D9C1D65273
1 changed files with 9 additions and 4 deletions
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13
lib/stdlib/qsort.c
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@ -1,6 +1,7 @@
/* -*-comment-start: "//";comment-end:""-*- /* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software * GNU Mes --- Maxwell Equations of Software
* Copyright © 2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org> * Copyright © 2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
* Copyright © 2021 Paul Dersey <pdersey@gmail.com>
* *
* This file is part of GNU Mes. * This file is part of GNU Mes.
* *
@ -24,10 +25,14 @@
void void
qswap (void *a, void *b, size_t size) qswap (void *a, void *b, size_t size)
{ {
char *buf[8]; char *pa = a;
memcpy (buf, a, size); char *pb = b;
memcpy (a, b, size); do
memcpy (b, buf, size); {
char tmp = *pa;
*pa++ = *pb;
*pb++ = tmp;
} while (--size > 0);
} }
size_t size_t