Add definition of nitems for those without it and use it throughout.

include/compat/charclass.h

@@ -36,4 +36,4 @@ static struct cclass {
 	{ NULL,		NULL }
 };
 
-#define NCCLASSES	(sizeof(cclasses) / sizeof(cclasses[0]) - 1)
+#define NCCLASSES	(nitems(cclasses) - 1)

include/sudo_compat.h

@@ -237,6 +237,13 @@ typedef struct sigaction sigaction_t;
 # define SA_RESTART	0
 #endif
 
+/*
+ * The nitems macro may be defined in sys/param.h
+ */
+#ifndef nitems
+# define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
+#endif
+
 /*
  * If dirfd() does not exists, hopefully dd_fd does.
  */

lib/util/aix.c

@@ -90,7 +90,7 @@ aix_setlimits(char *user)
      * For each resource limit, get the soft/hard values for the user
      * and set those values via setrlimit64().  Must be run as euid 0.
      */
-    for (n = 0; n < sizeof(aix_limits) / sizeof(aix_limits[0]); n++) {
+    for (n = 0; n < nitems(aix_limits); n++) {
 	/*
 	 * We have two strategies, depending on whether or not the
 	 * hard limit has been defined.

lib/util/getaddrinfo.c

@@ -144,13 +144,6 @@ static const char * const gai_errors[] = {
 # define sin_set_length(s) /* empty */
 #endif
 
-/*
- * Used for iterating through arrays.  ARRAY_SIZE returns the number of
- * elements in the array (useful for a < upper bound in a for loop).
- */
-#define ARRAY_SIZE(array) (sizeof(array) / sizeof((array)[0]))
-
-
 /*
  * Return a constant string for a given EAI_* error code or a string
  * indicating an unknown error.
@@ -158,7 +151,7 @@ static const char * const gai_errors[] = {
 const char *
 sudo_gai_strerror(int ecode)
 {
-    if (ecode < 1 || (size_t) ecode > ARRAY_SIZE(gai_errors))
+    if (ecode < 1 || (size_t) ecode > nitems(gai_errors))
         return "Unknown error";
     else
         return gai_errors[ecode - 1];

lib/util/sudo_debug.c

@@ -81,7 +81,7 @@ static const char *const sudo_debug_default_subsystems[] = {
     NULL
 };
 
-#define NUM_DEF_SUBSYSTEMS	(sizeof(sudo_debug_default_subsystems) / sizeof(sudo_debug_default_subsystems[0]) - 1)
+#define NUM_DEF_SUBSYSTEMS	(nitems(sudo_debug_default_subsystems) - 1)
 
 /*
  * For multiple programs/plugins there is a per-program instance

plugins/sudoers/insults.h

@@ -42,14 +42,14 @@ char *insults[] = {
 #  include "ins_csops.h"
 # endif
 
-    (char *) 0
+    NULL
 
 };
 
 /*
  * How may I insult you?  Let me count the ways...
  */
-#define NOFINSULTS (sizeof(insults) / sizeof(insults[0]) - 1)
+#define NOFINSULTS (nitems(insults) - 1)
 
 /*
  * return a pseudo-random insult.

plugins/sudoers/regress/parser/check_base64.c

@@ -74,7 +74,7 @@ struct base64_test {
 int
 main(int argc, char *argv[])
 {
-    const int ntests = (sizeof(test_strings) / sizeof(test_strings[0]));
+    const int ntests = nitems(test_strings);
     int i, errors = 0;
     unsigned char buf[32];
     size_t len;

plugins/sudoers/regress/parser/check_fill.c

@@ -175,13 +175,11 @@ main(int argc, char *argv[])
 
     initprogname(argc > 0 ? argv[0] : "check_fill");
 
-    errors += do_tests(check_fill, txt_data, sizeof(txt_data) / sizeof(txt_data[0]));
-    errors += do_tests(check_fill_cmnd, cmd_data, sizeof(cmd_data) / sizeof(cmd_data[0]));
-    errors += do_tests(check_fill_args, args_data, sizeof(args_data) / sizeof(args_data[0]));
+    errors += do_tests(check_fill, txt_data, nitems(txt_data));
+    errors += do_tests(check_fill_cmnd, cmd_data, nitems(cmd_data));
+    errors += do_tests(check_fill_args, args_data, nitems(args_data));
 
-    ntests = sizeof(txt_data) / sizeof(txt_data[0]) +
-	sizeof(cmd_data) / sizeof(cmd_data[0]) +
-	sizeof(args_data) / sizeof(args_data[0]);
+    ntests = nitems(txt_data) + nitems(cmd_data) + nitems(args_data);
     printf("%s: %d tests run, %d errors, %d%% success rate\n", getprogname(),
 	ntests, errors, (ntests - errors) * 100 / ntests);
 

plugins/sudoers/sudoers_debug.c

@@ -59,7 +59,7 @@ static const char *const sudoers_subsystem_names[] = {
     NULL
 };
 
-#define NUM_SUBSYSTEMS  (sizeof(sudoers_subsystem_names) / sizeof(sudoers_subsystem_names[0]) - 1)
+#define NUM_SUBSYSTEMS  (nitems(sudoers_subsystem_names) - 1)
 
 /* Subsystem IDs assigned at registration time. */
 unsigned int sudoers_subsystem_ids[NUM_SUBSYSTEMS];