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$NetBSD: patch-libgnu_fseeko.c,v 1.1 2021/12/15 17:20:57 adam Exp $
--- libgnu/fseeko.c.orig 2015-05-23 14:36:16.000000000 +0000
+++ libgnu/fseeko.c
@@ -22,6 +22,9 @@
/* Get off_t, lseek, _POSIX_VERSION. */
#include <unistd.h>
+/* mem* */
+#include <string.h>
+
#include "stdio-impl.h"
int
@@ -132,19 +135,12 @@ fseeko (FILE *fp, off_t offset, int when
/* fp_->_offset is typed as an integer. */
fp_->_offset = pos;
# else
- /* fp_->_offset is an fpos_t. */
- {
- /* Use a union, since on NetBSD, the compilation flags
- determine whether fpos_t is typedef'd to off_t or a struct
- containing a single off_t member. */
- union
- {
- fpos_t f;
- off_t o;
- } u;
- u.o = pos;
- fp_->_offset = u.f;
- }
+ /*
+ * fp_->_offset is an fpos_t or off_t
+ * in either case the off_t part is the first member of it.
+ */
+ memset(&fp_->_offset, 0, sizeof(fp_->_offset));
+ memcpy(&fp_->_offset, &pos, sizeof(pos));
# endif
fp_->_flags |= __SOFF;
fp_->_flags &= ~__SEOF;
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