sepolicy-analyze: Change booleans command to be more test-friendly.

Instead of displaying the boolean count, display a list of booleans
defined in the policy, if any.  This makes sepolicy-analyze booleans
consistent with sepolicy-analyze permissive and allows automated tests
to simply check whether there was any output at all.

Change-Id: I221b60d94e6e7f6d80399bf0833887af3747fe83
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>

tools/sepolicy-analyze/README

@@ -56,9 +56,9 @@ sepolicy-analyze
     BOOLEANS (booleans)
     sepolicy-analyze out/target/product/<board>/root/sepolicy booleans
 
-    Displays the number of booleans defined in the policy.  Policy
-    booleans are forbidden in Android policy, so if the output is
-    non-zero, the policy will fail CTS.
+    Displays the boolean names in the policy (if any).
+    Policy booleans are forbidden in Android policy, so if there is any
+    output, the policy will fail CTS.
 
     NEVERALLOW CHECKING (neverallow)
     sepolicy-analyze out/target/product/<board>/root/sepolicy neverallow \

tools/sepolicy-analyze/booleans.c

 #include "booleans.h"
-#include <sepol/booleans.h>
 
 void booleans_usage() {
     fprintf(stderr, "\tbooleans\n");
 }
 
+static int list_booleans(hashtab_key_t k,
+                         __attribute__ ((unused)) hashtab_datum_t d,
+                         __attribute__ ((unused)) void *args)
+{
+    const char *name = k;
+    printf("%s\n", name);
+    return 0;
+}
+
 int booleans_func (int argc, __attribute__ ((unused)) char **argv, policydb_t *policydb) {
-    int rc;
-    unsigned int count;
     if (argc != 1) {
         USAGE_ERROR = true;
         return -1;
     }
-    rc = sepol_bool_count(NULL, (const struct sepol_policydb *) policydb,
-                          &count);
-    if (rc)
-        return rc;
-    printf("%u\n", count);
-    return 0;
+    return hashtab_map(policydb->p_bools.table, list_booleans, NULL);
 }