1 files changed, 15 insertions, 0 deletions
diff --git a/libidu/idfile.h b/libidu/idfile.h
index 739819d..3775d7a 100644
--- a/libidu/idfile.h
+++ b/libidu/idfile.h
@@ -225,4 +225,19 @@ extern off_t largest_member_file;
 
 #define DEFAULT_ID_FILE_NAME "ID"
 
+/* Like stpncpy, but do ensure that the result is NUL-terminated,
+   and do not NUL-pad out to LEN.  I.e., when strnlen (src, len) == len,
+   this function writes a NUL byte into dest[len].  Thus, the length
+   of the destination buffer must be at least LEN + 1.
+   The DEST and SRC buffers must not overlap.  */
+static inline char *
+stzncpy (char *restrict dest, char const *restrict src, size_t len)
+{
+  char const *src_end = src + len;
+  while (src < src_end && *src)
+    *dest++ = *src++;
+  *dest = 0;
+  return dest;
+}
+
 #endif /* not _idfile_h_ */