1 files changed, 14 insertions, 0 deletions
diff --git a/src/system.h b/src/system.h
index 5e3b3cbde..6907603e6 100644
--- a/src/system.h
+++ b/src/system.h
@@ -626,6 +626,20 @@ The following directory is part of the cycle:\n  %s\n"), \
     }					\
   while (0)
 
+/* 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 destination
+   buffer must be at least LEN+1 bytes long.  */
+static inline char *
+stzncpy (char *dest, char const *src, size_t len)
+{
+  char const *src_end = src + len;
+  while (src < src_end && *src)
+    *dest++ = *src++;
+  *dest = 0;
+  return dest;
+}
+
 #ifndef ARRAY_CARDINALITY
 # define ARRAY_CARDINALITY(Array) (sizeof (Array) / sizeof *(Array))
 #endif