From 887b67908d0e6a2b2f50e04319c1cf4412a25f89 Mon Sep 17 00:00:00 2001
From: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Date: Fri, 25 Oct 2019 00:16:21 +0200
Subject: Add libutil implementation for strndup in case it isn't available

"Some" "non-POSIX systems" don't have that.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
---
 configure.ac           |  2 ++
 include/util/compat.h  |  4 ++++
 lib/util/Makemodule.am |  1 +
 lib/util/strndup.c     | 31 +++++++++++++++++++++++++++++++
 4 files changed, 38 insertions(+)
 create mode 100644 lib/util/strndup.c

diff --git a/configure.ac b/configure.ac
index 0bf09ce..6093717 100644
--- a/configure.ac
+++ b/configure.ac
@@ -218,6 +218,8 @@ AX_COMPILE_CHECK_SIZEOF(long long)
 AC_CHECK_HEADERS([sys/xattr.h], [], [])
 AC_CHECK_HEADERS([sys/sysinfo.h], [], [])
 
+AC_CHECK_FUNCS([strndup])
+
 ##### generate output #####
 
 AC_CONFIG_HEADERS([config.h])
diff --git a/include/util/compat.h b/include/util/compat.h
index d69a1de..8566090 100644
--- a/include/util/compat.h
+++ b/include/util/compat.h
@@ -110,4 +110,8 @@ struct stat {
 #include <sys/sysmacros.h>
 #endif
 
+#ifndef HAVE_STRNDUP
+char *strndup(const char *str, size_t max_len);
+#endif
+
 #endif /* COMPAT_H */
diff --git a/lib/util/Makemodule.am b/lib/util/Makemodule.am
index ffd594d..e624bbd 100644
--- a/lib/util/Makemodule.am
+++ b/lib/util/Makemodule.am
@@ -1,6 +1,7 @@
 libutil_la_SOURCES = include/util/util.h include/util/compat.h
 libutil_la_SOURCES += lib/util/str_table.c include/util/str_table.h
 libutil_la_SOURCES += lib/util/alloc.c lib/util/canonicalize_name.c
+libutil_la_SOURCES += lib/util/strndup.c
 libutil_la_CFLAGS = $(AM_CFLAGS)
 libutil_la_CPPFLAGS = $(AM_CPPFLAGS)
 libutil_la_LDFLAGS = $(AM_LDFLAGS)
diff --git a/lib/util/strndup.c b/lib/util/strndup.c
new file mode 100644
index 0000000..8031d23
--- /dev/null
+++ b/lib/util/strndup.c
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * strndup.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+#include "util/compat.h"
+
+#include <string.h>
+#include <stdlib.h>
+
+#ifndef HAVE_STRNDUP
+char *strndup(const char *str, size_t max_len)
+{
+	size_t len = 0;
+	char *out;
+
+	while (len < max_len && str[len] != '\0')
+		++len;
+
+	out = malloc(len + 1);
+
+	if (out != NULL) {
+		memcpy(out, str, len);
+		out[len] = '\0';
+	}
+
+	return out;
+}
+#endif
-- 
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