38 lines
1.2 KiB
Diff
38 lines
1.2 KiB
Diff
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From 68459714838c8c0c2d34b6d658638f5d59298bc7 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= <thomas@t-8ch.de>
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Date: Sun, 1 Oct 2023 13:57:12 +0200
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Subject: [PATCH] include/c.h: add helpers for unaligned structure access
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Signed-off-by: Thomas Weißschuh <thomas@t-8ch.de>
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Reference:https://github.com/util-linux/util-linux/commit/68459714838c8c0c2d34b6d658638f5d59298bc7
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Conflict:NA
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---
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include/c.h | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/include/c.h b/include/c.h
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index 752f568c5..224a8e54f 100644
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--- a/include/c.h
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+++ b/include/c.h
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@@ -213,6 +213,14 @@
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(type *)( (char *)__mptr - offsetof(type,member) );})
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#endif
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+#define read_unaligned_member(p, m) __extension__ ({ \
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+ size_t offset = offsetof(__typeof__(* p), m); \
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+ __typeof__(p->m) v; \
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+ memcpy(&v, ((unsigned char *)p) + offset, sizeof(v)); \
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+ v; })
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+
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+#define member_ptr(p, m) (((unsigned char *)p) + offsetof(__typeof__(*p), m))
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+
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#ifndef HAVE_PROGRAM_INVOCATION_SHORT_NAME
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# ifdef HAVE___PROGNAME
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extern char *__progname;
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--
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2.33.0
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