From: Sebastian Harl <sh@tokkee.org>
Date: Sun, 5 Oct 2014 18:25:32 +0000 (+0200)
Subject: data: Added sdb_data_isnull().
X-Git-Tag: sysdb-0.5.0~10
X-Git-Url: https://git.tokkee.org/?a=commitdiff_plain;h=7649cd039c4ca73698403baf1bc6c3cad4af8301;p=sysdb.git

data: Added sdb_data_isnull().

The function determines if a datum pointer or a string or binary datum is
NULL.
---

diff --git a/src/core/data.c b/src/core/data.c
index a57c8c6..eeead55 100644
--- a/src/core/data.c
+++ b/src/core/data.c
@@ -334,6 +334,18 @@ sdb_data_cmp(const sdb_data_t *d1, const sdb_data_t *d2)
 #undef CMP_NULL
 } /* sdb_data_cmp */
 
+_Bool
+sdb_data_isnull(const sdb_data_t *datum)
+{
+	if (! datum)
+		return 1;
+	if ((datum->type == SDB_TYPE_STRING) && (! datum->data.string))
+		return 1;
+	if ((datum->type == SDB_TYPE_BINARY) && (! datum->data.binary.datum))
+		return 1;
+	return 0;
+} /* sdb_data_isnull */
+
 int
 sdb_data_expr_eval(int op, const sdb_data_t *d1, const sdb_data_t *d2,
 		sdb_data_t *res)
diff --git a/src/include/core/data.h b/src/include/core/data.h
index 02f99c5..af4ae5a 100644
--- a/src/include/core/data.h
+++ b/src/include/core/data.h
@@ -115,6 +115,14 @@ sdb_data_free_datum(sdb_data_t *datum);
 int
 sdb_data_cmp(const sdb_data_t *d1, const sdb_data_t *d2);
 
+/*
+ * sdb_data_isnull:
+ * Determine whether a datum is NULL. A datum is considered to be NULL if
+ * either datum is NULL or if the string or binary datum is NULL.
+ */
+_Bool
+sdb_data_isnull(const sdb_data_t *datum);
+
 /*
  * Operators supported by sdb_data_eval_expr.
  */