From: Alejandro Colomar <alx@kernel.org>
Date: Sun, 19 Jan 2025 15:01:45 +0000 (+0100)
Subject: lib/string/strdup/strndupa.h: strndupa(3): Add macro
X-Git-Tag: 4.18.0-rc1~71
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ab14486633e9064ad2e59d9e254848afc6d23f33;p=thirdparty%2Fshadow.git

lib/string/strdup/strndupa.h: strndupa(3): Add macro

musl doesn't provide strndupa(3).

Signed-off-by: Alejandro Colomar <alx@kernel.org>
---

diff --git a/lib/string/strdup/strndupa.h b/lib/string/strdup/strndupa.h
index cefc29820..c8d53f30b 100644
--- a/lib/string/strdup/strndupa.h
+++ b/lib/string/strdup/strndupa.h
@@ -15,6 +15,12 @@
 #include "string/strcpy/strncat.h"
 
 
+// string n-bounded-read duplicate using-alloca(3)
+#ifndef  strndupa
+# define strndupa(s, n)  strncat(strcpy(alloca(n + 1), ""), s, n)
+#endif
+
+
 // Similar to strndupa(3), but ensure that 's' is an array.
 #define STRNDUPA(s)                                                           \
 (                                                                             \