maint: prefer countof over ARRAY_CARDINALITY

* bootstrap.conf (gnulib_modules): Add stdcountof-h.
* src/system.h: Include stdcountof.h.
(ARRAY_CARDINALITY): Remove definition.
* .gitignore (/lib/stdcountof.h): Ignore Gnulib generated file.
* src/csplit.c: Use countof instead of ARRAY_CARDINALITY.
* src/df.c: Likewise.
* src/digest.c: Likewise.
* src/dircolors.c: Likewise.
* src/factor.c: Likewise.
* src/join.c: Likewise.
* src/ls.c: Likewise.
* src/od.c: Likewise.
* src/sort.c: Likewise.
* src/stdbuf.c: Likewise.
* src/tr.c: Likewise.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/tr.c b/src/tr.c
index 87daa9471..f172ced86 100644
--- a/src/tr.c
+++ b/src/tr.c
@@ -545,7 +545,7 @@ look_up_char_class (char const *class_str, size_t len)
 {
   enum Char_class i;
 
-  for (i = 0; i < ARRAY_CARDINALITY (char_class_name); i++)
+  for (i = 0; i < countof (char_class_name); i++)
     if (STREQ_LEN (class_str, char_class_name[i], len)
         && strlen (char_class_name[i]) == len)
       return i;