From 05e8bd664d0244cb8ab4376b962830b97860f6bf Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Fri, 31 Mar 2017 18:37:19 -0700
Subject: [PATCH] check for strndupa before using it

musl does not have strndupa

Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 config.h.in                        |  4 ++++
 configure.ac                       |  1 +
 src/systemd/src/basic/alloc-util.h | 12 ++++++++++++
 3 files changed, 17 insertions(+)

diff --git a/config.h.in b/config.h.in
index db8c135..c4229ed 100644
--- a/config.h.in
+++ b/config.h.in
@@ -41,6 +41,10 @@
    */
 #undef HAVE_DCGETTEXT
 
+/* Define to 1 if you have the declaration of `strndupa', and to 0 if you
+   don't. */
+#undef HAVE_DECL_STRNDUPA
+
 /* Define to 1 if you have the <dlfcn.h> header file. */
 #undef HAVE_DLFCN_H
 
diff --git a/configure.ac b/configure.ac
index 2630f8d..d0a57fd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -54,6 +54,7 @@ AC_SUBST(NM_VERSION)
 
 GIT_SHA_RECORD(NM_GIT_SHA)
 
+AC_CHECK_DECLS([strndupa], [], [], [[#include <string.h>]])
 dnl
 dnl Checks for typedefs, structures, and compiler characteristics.
 dnl
diff --git a/src/systemd/src/basic/alloc-util.h b/src/systemd/src/basic/alloc-util.h
index ceeee51..924b59c 100644
--- a/src/systemd/src/basic/alloc-util.h
+++ b/src/systemd/src/basic/alloc-util.h
@@ -25,6 +25,18 @@
 #include <string.h>
 
 #include "macro.h"
+#include "config.h"
+
+#if !HAVE_DECL_STRNDUPA
+#define strndupa(s, n) \
+  ({ \
+    const char *__old = (s); \
+    size_t __len = strnlen(__old, (n)); \
+    char *__new = (char *)alloca(__len + 1); \
+    __new[__len] = '\0'; \
+    (char *)memcpy(__new, __old, __len); \
+  })
+#endif
 
 #define new(t, n) ((t*) malloc_multiply(sizeof(t), (n)))
 
-- 
2.12.1