X-Git-Url: https://diplodocus.org/git/nmh/blobdiff_plain/81a21a9a97d8633f6d6231e31fdb6e328d0d3ff2..3ab1e9323e964d5377952a2b666ce91bab39c45a:/sbr/concat.c

diff --git a/sbr/concat.c b/sbr/concat.c
index 4d4e15c1..234d1751 100644
--- a/sbr/concat.c
+++ b/sbr/concat.c
@@ -3,8 +3,6 @@
  * concat.c -- concatenate a variable number (minimum of 1)
  *             of strings in managed memory
  *
- * $Id$
- *
  * This code is Copyright (c) 2002, by the authors of nmh.  See the
  * COPYRIGHT file in the root directory of the nmh distribution for
  * complete copyright information.
@@ -14,8 +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;