src/common.c: get_kstat_value: Check the arguments and return error codes.

Rather than asserting that an argument is not NULL, check this condition
and return an error code.

This should fix Github issue #71.

diff --git a/src/common.c b/src/common.c
index 3bab7a5..f201b40 100644 (file)
--- a/src/common.c
+++ b/src/common.c
@@ -635,24 +635,23 @@ long long get_kstat_value (kstat_t *ksp, char *name)
        kstat_named_t *kn;
        long long retval = -1LL;
 
-#ifdef assert
-       assert (ksp != NULL);
-       assert (ksp->ks_type == KSTAT_TYPE_NAMED);
-#else
        if (ksp == NULL)
        {
-               ERROR ("ERROR: %s:%i: ksp == NULL\n", __FILE__, __LINE__);
+               ERROR ("get_kstat_value (\"%s\"): ksp is NULL.", name)
                return (-1LL);
        }
        else if (ksp->ks_type != KSTAT_TYPE_NAMED)
        {
-               ERROR ("ERROR: %s:%i: ksp->ks_type != KSTAT_TYPE_NAMED\n", __FILE__, __LINE__);
+               ERROR ("get_kstat_value (\"%s\"): ksp->ks_type (%#x) "
+                               "is not KSTAT_TYPE_NAMED (%#x).",
+                               name,
+                               (unsigned int) ksp->ks_type,
+                               (unsigned int) KSTAT_TYPE_NAMED);
                return (-1LL);
        }
-#endif
 
        if ((kn = (kstat_named_t *) kstat_data_lookup (ksp, name)) == NULL)
-               return (retval);
+               return (-1LL);
 
        if (kn->data_type == KSTAT_DATA_INT32)
                retval = (long long) kn->value.i32;