Add macro definitions to report infrastructure for character array length.

Rather than hard code the size of the field, use a #define, so we can re-use.
The #define will be needed in a future patch when we extend the reporting
infrastructure to have 'get' and 'set' functions for each field, allowing
lvm2app functions which query any report field.  In order to provide a
generic lookup based on the field id, we will define a type containing this
field id, and thus, we will need to re-use the length of this string as
it's defined inside libdevmapper.h.

diff --git a/libdm/libdevmapper.h b/libdm/libdevmapper.h
index e535d2bca937ea1d7364fd0b876599bcbce6c357..38b901f394583e0b6288b9faaa2a76a953e56d82 100644 (file)
--- a/libdm/libdevmapper.h
+++ b/libdm/libdevmapper.h
@@ -1048,14 +1048,19 @@ struct dm_report_field;
 #define DM_REPORT_FIELD_TYPE_STRING    0x00000010
 #define DM_REPORT_FIELD_TYPE_NUMBER    0x00000020
 
+#define DM_REPORT_FIELD_TYPE_ID_LEN 32
+#define DM_REPORT_FIELD_TYPE_HEADING_LEN 32
+
 struct dm_report;
 struct dm_report_field_type {
        uint32_t type;          /* object type id */
        uint32_t flags;         /* DM_REPORT_FIELD_* */
        uint32_t offset;        /* byte offset in the object */
        int32_t width;          /* default width */
-       const char id[32];      /* string used to specify the field */
-       const char heading[32]; /* string printed in header */
+       /* string used to specify the field */
+       const char id[DM_REPORT_FIELD_TYPE_ID_LEN];
+       /* string printed in header */
+       const char heading[DM_REPORT_FIELD_TYPE_HEADING_LEN];
        int (*report_fn)(struct dm_report *rh, struct dm_pool *mem,
                         struct dm_report_field *field, const void *data,
                         void *private_data);