lib/string/strdup/: STRDUPA(): Add macro

This is like strdupa(3), but we make sure that the argument is a string literal, which makes sure that we won't have a stack overflow. Signed-off-by: Alejandro Colomar <[email protected]>
shadow-maint · Jan 18, 2025 · 6cc1677 · 6cc1677
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commit 6cc1677
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diff --git a/lib/Makefile.am b/lib/Makefile.am
@@ -202,6 +202,8 @@ libshadow_la_SOURCES = \
 	string/strcpy/strncpy.h \
 	string/strcpy/strtcpy.c \
 	string/strcpy/strtcpy.h \
+	string/strdup/strdupa.c \
+	string/strdup/strdupa.h \
 	string/strdup/strndupa.c \
 	string/strdup/strndupa.h \
 	string/strdup/xstrdup.c \

diff --git a/lib/string/strdup/strdupa.c b/lib/string/strdup/strdupa.c
@@ -0,0 +1,7 @@
+// SPDX-FileCopyrightText: 2025, Alejandro Colomar <[email protected]>
+// SPDX-License-Identifier: BSD-3-Clause
+
+
+#include <config.h>
+
+#include "string/strdup/strdupa.h"
diff --git a/lib/string/strdup/strdupa.h b/lib/string/strdup/strdupa.h
@@ -0,0 +1,18 @@
+// SPDX-FileCopyrightText: 2025, Alejandro Colomar <[email protected]>
+// SPDX-License-Identifier: BSD-3-Clause
+
+
+#ifndef SHADOW_INCLUDE_LIB_STRING_STRDUP_STRDUPA_H_
+#define SHADOW_INCLUDE_LIB_STRING_STRDUP_STRDUPA_H_
+
+
+#include <config.h>
+
+#include <string.h>
+
+
+// strdupa(3), but make sure that the argument is a string literal.
+#define STRDUPA(s)  strdupa("" s "")
+
+
+#endif  // include guard