-/* PSPP - computes sample statistics.
- Copyright (C) 2004 Free Software Foundation, Inc.
- Written by Ben Pfaff <blp@gnu.org>.
+/* PSPP - a program for statistical analysis.
+ 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
- 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/>. */
#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
-case_unshare (struct ccase *c)
-{
- struct case_data *cd;
-
- assert (c->case_data->ref_cnt > 1);
+/* Reference-counted case implementation. */
+struct case_data
+ {
+ size_t value_cnt; /* Number of values. */
+ unsigned ref_cnt; /* Reference count. */
+ union value values[1]; /* Values. */
+ };
- 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);
+/* Ensures that C does not share data with any other case. */
+static void
+case_unshare (struct ccase *c)
+{
+ 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
-case_size (size_t value_cnt)
+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)
+case_nullify (struct ccase *c)
{
c->case_data = NULL;
}
-#endif /* DEBUGGING */
-#ifdef DEBUGGING
/* Returns true iff C is a null case. */
-int
-case_is_null (const struct ccase *c)
+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
written. */
void
-case_create (struct ccase *c, size_t value_cnt)
+case_create (struct ccase *c, size_t value_cnt)
{
if (!case_try_create (c, value_cnt))
xalloc_die ();
}
-#ifdef DEBUGGING
/* Initializes CLONE as a copy of ORIG. */
void
case_clone (struct ccase *clone, const struct ccase *orig)
{
assert (orig->case_data->ref_cnt > 0);
- if (clone != 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_move (struct ccase *dst, struct ccase *src)
+case_move (struct ccase *dst, struct ccase *src)
{
assert (src->case_data->ref_cnt > 0);
-
- if (dst != src)
+
+ if (dst != src)
{
*dst = *src;
- case_nullify (src);
+ case_nullify (src);
}
}
-#endif /* DEBUGGING */
-#ifdef DEBUGGING
/* Destroys case C. */
void
-case_destroy (struct ccase *c)
+case_destroy (struct ccase *c)
{
struct case_data *cd;
-
- assert (c != NULL);
cd = c->case_data;
- if (cd != NULL && --cd->ref_cnt == 0)
+ if (cd != NULL && --cd->ref_cnt == 0)
{
memset (cd->values, 0xcc, sizeof *cd->values * cd->value_cnt);
cd->value_cnt = 0xdeadbeef;
- free (cd);
+ 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. */
void
-case_swap (struct ccase *a, struct ccase *b)
+case_swap (struct ccase *a, struct ccase *b)
{
struct case_data *t = a->case_data;
a->case_data = b->case_data;
values. Returns true if successful, false if memory
allocation failed. */
bool
-case_try_create (struct ccase *c, size_t value_cnt)
+case_try_create (struct ccase *c, size_t value_cnt)
{
c->case_data = malloc (case_size (value_cnt));
- if (c->case_data != NULL)
+ if (c->case_data != NULL)
{
c->case_data->value_cnt = value_cnt;
c->case_data->ref_cnt = 1;
return true;
}
-
+
return false;
}
Returns true if successful, false if memory allocation
failed. */
bool
-case_try_clone (struct ccase *clone, const struct ccase *orig)
+case_try_clone (struct ccase *clone, const struct ccase *orig)
{
case_clone (clone, orig);
return true;
}
-#ifdef DEBUGGING
/* Copies VALUE_CNT values from SRC (starting at SRC_IDX) to DST
(starting at DST_IDX). */
void
assert (src->case_data->ref_cnt > 0);
assert (src_idx + value_cnt <= src->case_data->value_cnt);
- if (dst->case_data != src->case_data || dst_idx != src_idx)
+ 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);
+ 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. */
+/* Copies VALUE_CNT values out of case C to VALUES, starting at
+ the given START_IDX. */
void
-case_to_values (const struct ccase *c, union value *output,
- size_t output_size UNUSED)
+case_copy_out (const struct ccase *c,
+ size_t start_idx, union value *values, size_t value_cnt)
{
assert (c->case_data->ref_cnt > 0);
- assert (output_size == c->case_data->value_cnt);
- assert (output != NULL || output_size == 0);
+ assert (value_cnt <= c->case_data->value_cnt);
+ assert (start_idx + value_cnt <= c->case_data->value_cnt);
- memcpy (output, c->case_data->values,
- c->case_data->value_cnt * sizeof *output);
+ memcpy (values, c->case_data->values + start_idx,
+ value_cnt * sizeof *values);
}
-#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. */
+/* Copies VALUE_CNT values from VALUES into case C, staring at
+ the given START_IDX. */
void
-case_from_values (struct ccase *c, const union value *input,
- size_t input_size UNUSED)
+case_copy_in (struct ccase *c,
+ size_t start_idx, const union value *values, size_t value_cnt)
{
- 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);
+ assert (value_cnt <= c->case_data->value_cnt);
+ assert (start_idx + value_cnt <= c->case_data->value_cnt);
- if (c->case_data->ref_cnt > 1)
- case_unshare (c);
- memcpy (c->case_data->values, input,
- c->case_data->value_cnt * sizeof *input);
+ case_unshare (c);
+ memcpy (c->case_data->values + start_idx, values,
+ value_cnt * sizeof *values);
+}
+
+/* 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));
}
-#endif /* DEBUGGING */
-#ifdef DEBUGGING
/* 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)
+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)
+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.)
The caller must not modify the return value. */
const char *
-case_str_idx (const struct ccase *c, size_t idx)
+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)
+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. */
int
case_compare (const struct ccase *a, const struct ccase *b,
- struct variable *const *vp, size_t var_cnt)
+ const struct variable *const *vp, size_t var_cnt)
{
return case_compare_2dict (a, b, vp, vp, var_cnt);
}
and returns a strcmp()-type result. */
int
case_compare_2dict (const struct ccase *ca, const struct ccase *cb,
- struct variable *const *vap, struct variable *const *vbp,
- size_t var_cnt)
+ const struct variable *const *vap,
+ const struct variable *const *vbp,
+ size_t var_cnt)
{
- for (; var_cnt-- > 0; vap++, vbp++)
+ for (; var_cnt-- > 0; vap++, vbp++)
{
const struct variable *va = *vap;
const struct variable *vb = *vbp;
assert (var_get_width (va) == var_get_width (vb));
-
- if (var_get_width (va) == 0)
+
+ if (var_get_width (va) == 0)
{
double af = case_num (ca, va);
double bf = case_num (cb, vb);
- if (af != bf)
+ if (af != bf)
return af > bf ? 1 : -1;
}
- else
+ else
{
const char *as = case_str (ca, va);
const char *bs = case_str (cb, vb);
NOTE: This function breaks the case abstraction. It should
*not* be used often. Prefer the other case functions. */
const union value *
-case_data_all (const struct ccase *c)
+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;
NOTE: This function breaks the case abstraction. It should
*not* be used often. Prefer the other case functions. */
union value *
-case_data_all_rw (struct ccase *c)
+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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