X-Git-Url: https://diplodocus.org/git/nmh/blobdiff_plain/5dd6771b28c257af405d7248639ed0e3bcdce38b..e5afa1df87c24d49f0572ff903d4b0ee2eb803a8:/sbr/concat.c

diff --git a/sbr/concat.c b/sbr/concat.c
index 82979f5a..234d1751 100644
--- a/sbr/concat.c
+++ b/sbr/concat.c
@@ -12,8 +12,13 @@
 #include <h/utils.h>
 
 
+/* concat returns a non-NULL malloc'd pointer to the catenation of the
+ * argument strings less their NUL terminators other than the last.  The
+ * arguments are terminated by a NULL.
+ *
+ * Example:  concat("abc", "def", "", "g", NULL) returns "abcdefg". */
 char *
-concat (char *s1, ...)
+concat (const char *s1, ...)
 {
     char *cp, *dp, *sp;
     size_t len;