From 9867a9d6a21e6b0b9bcba57c3e2398fe671cea17 Mon Sep 17 00:00:00 2001
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From: Christian Storm <christian.storm@siemens.com>
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Date: Tue, 16 Jan 2018 10:34:52 +0100
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Subject: [PATCH] compat.h: introduce compatibility header
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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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Introduce a compat.h housing compatibility definitions
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and macros along the lines of commit 7b49b8d having
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introduced a compatibility mechanism for Lua.
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First use case (and motivation) is the support for
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musl (https://www.musl-libc.org/) which doesn't
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bother to provide
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char *strndupa(const char *s, size_t n)
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Backported from: 9867a9d6a21e6b0b9bcba57c3e2398fe671cea17
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Reviewed-by: Stefano Babic <sbabic@denx.de>
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Reported-by: Jörg Krause <joerg.krause@embedded.rocks>
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Signed-off-by: Christian Storm <christian.storm@siemens.com>
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Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
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---
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include/compat.h | 24 ++++++++++++++++++++++++
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include/util.h | 1 +
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ipc/network_ipc.c | 1 +
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3 files changed, 26 insertions(+)
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create mode 100644 include/compat.h
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diff --git a/include/compat.h b/include/compat.h
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new file mode 100644
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index 0000000..29d7af1
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--- /dev/null
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+++ b/include/compat.h
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@@ -0,0 +1,24 @@
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+/*
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+ * Author: Christian Storm
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+ * Copyright (C) 2018, Siemens AG
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+ *
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+ * SPDX-License-Identifier: GPL-2.0-or-later
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+ */
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+
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+#pragma once
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+
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+#ifndef strndupa
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+/*
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+ * Define char *strndupa(const char *s, size_t n)
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+ * for, e.g., musl (https://www.musl-libc.org/)
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+ * which does not bother to implement this function.
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+ */
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+#define strndupa(s, n) \
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+ (__extension__({ \
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+ const char *__in = (s); \
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+ size_t __len = strnlen(__in, (n)) + 1; \
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+ char *__out = (char *)alloca(__len); \
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+ __out[__len - 1] = '\0'; \
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+ (char *)memcpy(__out, __in, __len - 1); \
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+ }))
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+#endif
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diff --git a/include/util.h b/include/util.h
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index bec2975..d43cd8c 100644
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--- a/include/util.h
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+++ b/include/util.h
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@@ -12,6 +12,7 @@
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#include <string.h>
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#include "swupdate.h"
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#include "swupdate_status.h"
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+#include "compat.h"
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#define NOTIFY_BUF_SIZE 2048
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#define ENOMEM_ASPRINTF -1
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diff --git a/ipc/network_ipc.c b/ipc/network_ipc.c
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index 3f197c7..48f6fcc 100644
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--- a/ipc/network_ipc.c
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+++ b/ipc/network_ipc.c
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@@ -27,6 +27,7 @@
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#include <pthread.h>
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#include "network_ipc.h"
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+#include "compat.h"
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#ifdef CONFIG_SOCKET_CTRL_PATH
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static char* SOCKET_CTRL_PATH = (char*)CONFIG_SOCKET_CTRL_PATH;
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--
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2.15.1
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