/* PSPP - computes sample statistics.
- Copyright (C) 2004 Free Software Foundation, Inc.
+ Copyright (C) 2004, 2007 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
02110-1301, USA. */
#include <config.h>
-#include "case.h"
+
+#include <data/case.h>
+
+#include <assert.h>
#include <limits.h>
#include <stdlib.h>
-#include "value.h"
+
+#include <data/value.h>
+#include <data/variable.h>
#include <libpspp/alloc.h>
#include <libpspp/str.h>
-#include "variable.h"
-#ifdef DEBUGGING
-#undef NDEBUG
-#else
-#ifndef NDEBUG
-#define NDEBUG
-#endif
-#endif
-#include <assert.h>
+#include "minmax.h"
-/* Changes C not to share data with any other case.
- C must be a case with a reference count greater than 1.
- There should be no reason for external code to call this
- function explicitly. It will be called automatically when
- needed. */
-void
+/* Reference-counted case implementation. */
+struct case_data
+ {
+ size_t value_cnt; /* Number of values. */
+ unsigned ref_cnt; /* Reference count. */
+ union value values[1]; /* Values. */
+ };
+
+/* Ensures that C does not share data with any other case. */
+static void
case_unshare (struct ccase *c)
{
- struct case_data *cd;
-
- assert (c->case_data->ref_cnt > 1);
-
- cd = c->case_data;
- cd->ref_cnt--;
- case_create (c, c->case_data->value_cnt);
- memcpy (c->case_data->values, cd->values,
- sizeof *cd->values * cd->value_cnt);
+ if (c->case_data->ref_cnt > 1)
+ {
+ struct case_data *cd = c->case_data;
+ cd->ref_cnt--;
+ case_create (c, cd->value_cnt);
+ memcpy (c->case_data->values, cd->values,
+ sizeof *cd->values * cd->value_cnt);
+ }
}
/* Returns the number of bytes needed by a case with VALUE_CNT
values. */
-static inline size_t
+static size_t
case_size (size_t value_cnt)
{
return (offsetof (struct case_data, values)
+ value_cnt * sizeof (union value));
}
-#ifdef DEBUGGING
/* Initializes C as a null case. */
void
case_nullify (struct ccase *c)
{
c->case_data = NULL;
}
-#endif /* DEBUGGING */
-#ifdef DEBUGGING
/* Returns true iff C is a null case. */
-int
+bool
case_is_null (const struct ccase *c)
{
return c->case_data == NULL;
}
-#endif /* DEBUGGING */
/* Initializes C as a new case that can store VALUE_CNT values.
The values have indeterminate contents until explicitly
xalloc_die ();
}
-#ifdef DEBUGGING
/* Initializes CLONE as a copy of ORIG. */
void
case_clone (struct ccase *clone, const struct ccase *orig)
if (clone != orig)
*clone = *orig;
orig->case_data->ref_cnt++;
+#ifdef DEBUGGING
+ case_unshare (clone);
+#endif
}
-#endif /* DEBUGGING */
-#ifdef DEBUGGING
/* Replaces DST by SRC and nullifies SRC.
DST and SRC must be initialized cases at entry. */
void
case_nullify (src);
}
}
-#endif /* DEBUGGING */
-#ifdef DEBUGGING
/* Destroys case C. */
void
case_destroy (struct ccase *c)
{
struct case_data *cd;
- assert (c != NULL);
-
cd = c->case_data;
if (cd != NULL && --cd->ref_cnt == 0)
{
free (cd);
}
}
-#endif /* DEBUGGING */
-/* Resizes case C from OLD_CNT to NEW_CNT values. */
+/* Returns the number of union values in C. */
+size_t
+case_get_value_cnt (const struct ccase *c)
+{
+ return c->case_data->value_cnt;
+}
+
+/* Resizes case C to NEW_CNT union values. */
void
-case_resize (struct ccase *c, size_t old_cnt, size_t new_cnt)
+case_resize (struct ccase *c, size_t new_cnt)
{
- struct ccase new;
+ size_t old_cnt = case_get_value_cnt (c);
+ if (old_cnt != new_cnt)
+ {
+ struct ccase new;
- case_create (&new, new_cnt);
- case_copy (&new, 0, c, 0, old_cnt < new_cnt ? old_cnt : new_cnt);
- case_swap (&new, c);
- case_destroy (&new);
+ case_create (&new, new_cnt);
+ case_copy (&new, 0, c, 0, MIN (old_cnt, new_cnt));
+ case_swap (&new, c);
+ case_destroy (&new);
+ }
}
/* Swaps cases A and B. */
return true;
}
-#ifdef DEBUGGING
/* Copies VALUE_CNT values from SRC (starting at SRC_IDX) to DST
(starting at DST_IDX). */
void
if (dst->case_data != src->case_data || dst_idx != src_idx)
{
- if (dst->case_data->ref_cnt > 1)
- case_unshare (dst);
+ case_unshare (dst);
memmove (dst->case_data->values + dst_idx,
src->case_data->values + src_idx,
sizeof *dst->case_data->values * value_cnt);
}
}
-#endif /* DEBUGGING */
-#ifdef DEBUGGING
/* Copies case C to OUTPUT.
OUTPUT_SIZE is the number of `union values' in OUTPUT,
which must match the number of `union values' in C. */
memcpy (output, c->case_data->values,
c->case_data->value_cnt * sizeof *output);
}
-#endif /* DEBUGGING */
-#ifdef DEBUGGING
/* Copies INPUT into case C.
INPUT_SIZE is the number of `union values' in INPUT,
which must match the number of `union values' in C. */
case_from_values (struct ccase *c, const union value *input,
size_t input_size UNUSED)
{
- assert (c != NULL);
- assert (c->case_data != NULL);
assert (c->case_data->ref_cnt > 0);
assert (input_size == c->case_data->value_cnt);
assert (input != NULL || input_size == 0);
- if (c->case_data->ref_cnt > 1)
- case_unshare (c);
+ case_unshare (c);
memcpy (c->case_data->values, input,
c->case_data->value_cnt * sizeof *input);
}
-#endif /* DEBUGGING */
-#ifdef DEBUGGING
+/* Returns a pointer to the `union value' used for the
+ element of C for variable V.
+ Case C must be drawn from V's dictionary.
+ The caller must not modify the returned data. */
+const union value *
+case_data (const struct ccase *c, const struct variable *v)
+{
+ return case_data_idx (c, var_get_case_index (v));
+}
+
+/* Returns the numeric value of the `union value' in C for
+ variable V.
+ Case C must be drawn from V's dictionary. */
+double
+case_num (const struct ccase *c, const struct variable *v)
+{
+ return case_num_idx (c, var_get_case_index (v));
+}
+
+/* Returns the string value of the `union value' in C for
+ variable V.
+ Case C must be drawn from V's dictionary.
+ (Note that the value is not null-terminated.)
+ The caller must not modify the return value. */
+const char *
+case_str (const struct ccase *c, const struct variable *v)
+{
+ return case_str_idx (c, var_get_case_index (v));
+}
+
+/* Returns a pointer to the `union value' used for the
+ element of C for variable V.
+ Case C must be drawn from V's dictionary.
+ The caller is allowed to modify the returned data. */
+union value *
+case_data_rw (struct ccase *c, const struct variable *v)
+{
+ return case_data_rw_idx (c, var_get_case_index (v));
+}
+
/* Returns a pointer to the `union value' used for the
element of C numbered IDX.
The caller must not modify the returned data. */
const union value *
case_data_idx (const struct ccase *c, size_t idx)
{
- assert (c != NULL);
- assert (c->case_data != NULL);
assert (c->case_data->ref_cnt > 0);
assert (idx < c->case_data->value_cnt);
return &c->case_data->values[idx];
}
-#endif /* DEBUGGING */
-#ifdef DEBUGGING
/* Returns the numeric value of the `union value' in C numbered
IDX. */
double
case_num_idx (const struct ccase *c, size_t idx)
{
- assert (c != NULL);
- assert (c->case_data != NULL);
assert (c->case_data->ref_cnt > 0);
assert (idx < c->case_data->value_cnt);
return c->case_data->values[idx].f;
}
-#endif /* DEBUGGING */
-#ifdef DEBUGGING
/* Returns the string value of the `union value' in C numbered
IDX.
(Note that the value is not null-terminated.)
const char *
case_str_idx (const struct ccase *c, size_t idx)
{
- assert (c != NULL);
- assert (c->case_data != NULL);
assert (c->case_data->ref_cnt > 0);
assert (idx < c->case_data->value_cnt);
return c->case_data->values[idx].s;
}
-#endif /* DEBUGGING */
-#ifdef DEBUGGING
/* Returns a pointer to the `union value' used for the
element of C numbered IDX.
The caller is allowed to modify the returned data. */
union value *
case_data_rw_idx (struct ccase *c, size_t idx)
{
- assert (c != NULL);
- assert (c->case_data != NULL);
assert (c->case_data->ref_cnt > 0);
assert (idx < c->case_data->value_cnt);
- if (c->case_data->ref_cnt > 1)
- case_unshare (c);
+ case_unshare (c);
return &c->case_data->values[idx];
}
-#endif /* DEBUGGING */
/* Compares the values of the VAR_CNT variables in VP
in cases A and B and returns a strcmp()-type result. */
const union value *
case_data_all (const struct ccase *c)
{
- assert (c != NULL);
- assert (c->case_data != NULL);
assert (c->case_data->ref_cnt > 0);
return c->case_data->values;
union value *
case_data_all_rw (struct ccase *c)
{
- assert (c != NULL);
- assert (c->case_data != NULL);
assert (c->case_data->ref_cnt > 0);
- if (c->case_data->ref_cnt > 1)
- case_unshare (c);
+ case_unshare (c);
return c->case_data->values;
}
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