plugin: Make sdb_plugin_info_t public.

[sysdb.git] / src / core / data.c

diff --git a/src/core/data.c b/src/core/data.c
index 4e0fd779580f9dd734bf1211dc2769ca326a179f..dc2d0ae8afde4dbb741bc2525444fddad05ed0a8 100644 (file)
--- a/src/core/data.c
+++ b/src/core/data.c
@@ -90,8 +90,64 @@ sdb_data_free_datum(sdb_data_t *datum)
        }
 } /* sdb_data_free_datum */
 
+int
+sdb_data_cmp(sdb_data_t *d1, sdb_data_t *d2)
+{
+#define CMP_NULL(a, b) \
+       do { \
+               if (!(a) && !(b)) return 0; \
+               if (!(a)) return -1; \
+               if (!(b)) return 1; \
+       } while (0)
+
+       CMP_NULL(d1, d2);
+
+       if (d1->type != d2->type)
+               return -1;
+
+#define CMP(a, b) ((a) < (b) ? -1 : (a) > (b) ? 1 : 0)
+       switch (d1->type) {
+               case SDB_TYPE_INTEGER:
+                       return CMP(d1->data.integer, d2->data.integer);
+               case SDB_TYPE_DECIMAL:
+                       return CMP(d1->data.decimal, d2->data.decimal);
+               case SDB_TYPE_STRING:
+                       CMP_NULL(d1->data.string, d2->data.string);
+                       return strcasecmp(d1->data.string, d2->data.string);
+               case SDB_TYPE_DATETIME:
+                       return CMP(d1->data.datetime, d2->data.datetime);
+               case SDB_TYPE_BINARY:
+               {
+                       int diff;
+
+                       CMP_NULL(d1->data.binary.datum, d2->data.binary.datum);
+
+                       /* on a common prefix, the shorter datum sorts less */
+                       if (d1->data.binary.length < d2->data.binary.length) {
+                               diff = memcmp(d1->data.binary.datum, d2->data.binary.datum,
+                                               d1->data.binary.length);
+                               diff = diff ? diff : -1;
+                       }
+                       else if (d1->data.binary.length > d2->data.binary.length) {
+                               diff = memcmp(d1->data.binary.datum, d2->data.binary.datum,
+                                               d2->data.binary.length);
+                               diff = diff ? diff : 1;
+                       }
+                       else
+                               diff = memcmp(d1->data.binary.datum, d2->data.binary.datum,
+                                               d1->data.binary.length);
+
+                       return diff;
+               }
+               default:
+                       return -1;
+       }
+#undef CMP
+#undef CMP_NULL
+} /* sdb_data_cmp */
+
 size_t
-sdb_data_strlen(sdb_data_t *datum)
+sdb_data_strlen(const sdb_data_t *datum)
 {
        if (! datum)
                return 0;
@@ -119,7 +175,7 @@ sdb_data_strlen(sdb_data_t *datum)
 } /* sdb_data_strlen */
 
 int
-sdb_data_format(sdb_data_t *datum, char *buf, size_t buflen, int quoted)
+sdb_data_format(const sdb_data_t *datum, char *buf, size_t buflen, int quoted)
 {
        char tmp[sdb_data_strlen(datum) + 1];
        char *data = NULL;