From 5931ed5a14f56526f63c59d9ddbbae59b9a639cd Mon Sep 17 00:00:00 2001
From: Sascha Hauer <sha@octopus.labnet.pengutronix.de>
Date: Fri, 28 Sep 2007 10:45:59 +0200
Subject: [PATCH] add safe_strncpy() function

---
 include/libbb.h | 2 ++
 lib/libbb.c     | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/include/libbb.h b/include/libbb.h
index 9a1fdde5b..fdabc4bb5 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -24,4 +24,6 @@ int recursive_action(const char *fileName, unsigned flags,
 	int (*dirAction) (const char *fileName, struct stat* statbuf, void* userData, int depth),
 	void* userData, const unsigned depth);
 
+char * safe_strncpy(char *dst, const char *src, size_t size);
+
 #endif /* __LIBBB_H */
diff --git a/lib/libbb.c b/lib/libbb.c
index daa484c24..dd32307f1 100644
--- a/lib/libbb.c
+++ b/lib/libbb.c
@@ -99,3 +99,11 @@ char* last_char_is(const char *s, int c)
 	return NULL;
 }
 
+/* Like strncpy but make sure the resulting string is always 0 terminated. */
+char * safe_strncpy(char *dst, const char *src, size_t size)
+{
+	if (!size) return dst;
+	dst[--size] = '\0';
+	return strncpy(dst, src, size);
+}
+