apr_strcat optimization(s)

[Doug MacEachern]

the current apr_strcat does strlen() twice for each argument, this patch
makes it happen just once.  it would also be handy to have an apr_pstrcatn
(name debatable) that returns the calculated length so the caller can
avoid another strlen(), something like:

apr_size_t total_len;
apr_status_t status = apr_pstrcatn(pool, &total_len, ..., NULL);

then apr_pstrcat() would just be a wrapper around apr_pstrcatn().
i'll get a patch together if the name/prototype is agreed on.

--- srclib/apr/strings/apr_strings.c    2001/05/10 18:05:18     1.13
+++ srclib/apr/strings/apr_strings.c    2001/06/19 17:12:01
@@ -137,8 +137,9 @@
     va_start(adummy, a);
 
     while ((argp = va_arg(adummy, char *)) != NULL) {
-        strcpy(cp, argp);
-        cp += strlen(argp);
+        len = strlen(argp);
+        strncpy(cp, argp, len);
+        cp += len;
     }
 
     va_end(adummy);