Allow output files to overwrite input files (bug #21280). Thanks to

[pspp-builds.git] / src / data / category.c

diff --git a/src/data/category.c b/src/data/category.c
index 9e5c6b0c110ac0514a095abb41e760c3d68411c6..b0424d9f65c054df4631897702d33ab4eae1c57a 100644 (file)
--- a/src/data/category.c
+++ b/src/data/category.c
@@ -1,21 +1,18 @@
-/* PSPP - binary encodings for categorical variables.
+/* PSPP - a program for statistical analysis.
    Copyright (C) 2005 Free Software Foundation, Inc.
-   Written by Jason H Stover <jason@sakla.net>.
 
-   This program is free software; you can redistribute it and/or
-   modify it under the terms of the GNU General Public License as
-   published by the Free Software Foundation; either version 2 of the
-   License, or (at your option) any later version.
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   General Public License for more details.
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
 
    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., 51 Franklin Street, Fifth Floor, Boston, MA
-   02110-1301, USA. */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>. */
 
 /*
   Functions and data structures to store values of a categorical
@@ -33,26 +30,43 @@
 */
 #include <config.h>
 
-#include "category.h"
-
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>
 
-#include <libpspp/alloc.h>
 #include <libpspp/message.h>
-#include "cat-routines.h"
+#include "category.h"
 #include "value.h"
 #include "variable.h"
 
+#include "xalloc.h"
+
+#define CAT_VALUE_NOT_FOUND -2
+
 #define N_INITIAL_CATEGORIES 1
 
+/*
+  This structure contains the observed values of a
+  categorical variable.
+ */
+struct cat_vals
+{
+  union value *vals;
+  size_t n_categories;
+  size_t n_allocated_categories;       /* This is used only during
+                                          initialization to keep
+                                          track of the number of
+                                          values stored.
+                                        */
+};
+
 void
 cat_stored_values_create (const struct variable *v)
 {
   if (!var_has_obs_vals (v))
     {
       struct cat_vals *obs_vals = xmalloc (sizeof *obs_vals);
+
       obs_vals->n_categories = 0;
       obs_vals->n_allocated_categories = N_INITIAL_CATEGORIES;
       obs_vals->vals = xnmalloc (N_INITIAL_CATEGORIES, sizeof *obs_vals->vals);
@@ -63,7 +77,7 @@ cat_stored_values_create (const struct variable *v)
 void
 cat_stored_values_destroy (struct cat_vals *obs_vals)
 {
-  if (obs_vals != NULL) 
+  if (obs_vals != NULL)
     {
       if (obs_vals->n_allocated_categories > 0)
         free (obs_vals->vals);
@@ -117,8 +131,8 @@ cat_value_update (const struct variable *v, const union value *val)
     }
 }
 
-union value *
-cat_subscript_to_value (const size_t s, struct variable *v)
+const union value *
+cat_subscript_to_value (const size_t s, const struct variable *v)
 {
   struct cat_vals *obs_vals = var_get_obs_vals (v);
   return s < obs_vals->n_categories ? obs_vals->vals + s : NULL;
@@ -127,7 +141,7 @@ cat_subscript_to_value (const size_t s, struct variable *v)
 /*
   Return the number of categories of a categorical variable.
  */
-size_t 
+size_t
 cat_get_n_categories (const struct variable *v)
 {
   return var_get_obs_vals (v)->n_categories;