showbuildenv: Add comment describing exit-status convention.

[nmh] / sbr / concat.c

diff --git a/sbr/concat.c b/sbr/concat.c
index 4d4e15c1fd9191d76b6674764ea74f7c69ba1e7d..afe48206b1090ebf19db15bdbce7ae461251a45d 100644 (file)
--- 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
  *
  * 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.
  * 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>
 
 
 #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 *
 char *

-concat (char *s1, ...)
+concat (const char *s1, ...)

 {
     char *cp, *dp, *sp;
     size_t len;
 {
     char *cp, *dp, *sp;
     size_t len;


@@ -29,11 +32,11 @@ concat (char *s1, ...)
 
     dp = sp = mh_xmalloc(len);
 
 
     dp = sp = mh_xmalloc(len);
 

-    sp = copy(s1, sp);
+    sp = stpcpy(sp, s1);

 
     va_start(list, s1); 
     while ((cp = va_arg (list, char *)))
 
     va_start(list, s1); 
     while ((cp = va_arg (list, char *)))

-       sp = copy(cp, sp);
+       sp = stpcpy(sp, cp);

     va_end(list);
 
     return dp;
     va_end(list);
 
     return dp;