Adopt use of gnulib for portability.

[pspp-builds.git] / src / sort.h

diff --git a/src/sort.h b/src/sort.h
index 15a5b2db25d71f6f3a7d554e63426021ca52504d..af443edc34b8b4f5b5003b2d73d8f805b29003ce 100644 (file)
--- a/src/sort.h
+++ b/src/sort.h
@@ -14,20 +14,50 @@
 
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA. */
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301, USA. */
 
 #if !sort_h
 #define sort_h 1
 
-#include "vfm.h"
+#include <stddef.h>
+#include <stdbool.h>
 
-/* SORT CASES programmatic interface. */
-int sort_cases (int separate);
-void read_sort_output (write_case_func *, write_case_data);
+struct casereader;
+struct dictionary;
+struct variable;
 
-/* Variables to sort. */
-extern struct variable **v_sort;
-extern int nv_sort;
+
+/* Sort direction. */
+enum sort_direction
+  {
+    SRT_ASCEND,                        /* A, B, C, ..., X, Y, Z. */
+    SRT_DESCEND                        /* Z, Y, X, ..., C, B, A. */
+  };
+
+/* A sort criterion. */
+struct sort_criterion
+  {
+    int fv;                     /* Variable data index. */
+    int width;                  /* 0=numeric, otherwise string width. */
+    enum sort_direction dir;    /* Sort direction. */
+  };
+
+/* A set of sort criteria. */
+struct sort_criteria 
+  {
+    struct sort_criterion *crits;
+    size_t crit_cnt;
+  };
+
+
+void sort_destroy_criteria (struct sort_criteria *);
+
+struct casefile *sort_execute (struct casereader *,
+                               const struct sort_criteria *);
+
+int sort_active_file_in_place (const struct sort_criteria *);
+
+struct casefile *sort_active_file_to_casefile (const struct sort_criteria *);
 
 #endif /* !sort_h */