util: introduce xstrndup helper

We already have xstrdup, add xstrndup as well to make it
straight-forward to clone part of a string.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/util.h b/util.h
index 7a4e910..9d38ede 100644
--- a/util.h
+++ b/util.h
@@ -61,6 +61,7 @@ static inline void *xrealloc(void *p, size_t len)
 }
 
 extern char *xstrdup(const char *s);
+extern char *xstrndup(const char *s, size_t len);
 
 extern int PRINTF(2, 3) xasprintf(char **strp, const char *fmt, ...);
 extern int PRINTF(2, 3) xasprintf_append(char **strp, const char *fmt, ...);