+++ /dev/null
-/* PSPP - computes sample statistics.
- Copyright (C) 1997-9, 2000 Free Software Foundation, Inc.
- Written by Ben Pfaff <blp@gnu.org>.
-
- 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 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. */
-
-#include <config.h>
-#include "value-labels.h"
-#include "error.h"
-#include <stdlib.h>
-#include "alloc.h"
-#include "hash.h"
-#include "str.h"
-
-static hsh_compare_func compare_int_val_lab;
-static hsh_hash_func hash_int_val_lab;
-static hsh_free_func free_int_val_lab;
-
-struct atom;
-static struct atom *atom_create (const char *string);
-static void atom_destroy (struct atom *);
-static char *atom_to_string (const struct atom *);
-
-/* A set of value labels. */
-struct val_labs
- {
- int width; /* 0=numeric, otherwise string width. */
- struct hsh_table *labels; /* Hash table of `struct int_val_lab's. */
- };
-
-/* Creates and returns a new, empty set of value labels with the
- given WIDTH, which must designate a numeric (0) or short
- string (1...MAX_SHORT_STRING inclusive) width. */
-struct val_labs *
-val_labs_create (int width)
-{
- struct val_labs *vls;
-
- assert (width >= 0);
-
- vls = xmalloc (sizeof *vls);
- vls->width = width;
- vls->labels = NULL;
- return vls;
-}
-
-/* Creates and returns a new set of value labels identical to
- VLS. */
-struct val_labs *
-val_labs_copy (const struct val_labs *vls)
-{
- struct val_labs *copy;
- struct val_labs_iterator *i;
- struct val_lab *vl;
-
- assert (vls != NULL);
-
- copy = val_labs_create (vls->width);
- for (vl = val_labs_first (vls, &i); vl != NULL;
- vl = val_labs_next (vls, &i))
- val_labs_add (copy, vl->value, vl->label);
- return copy;
-}
-
-/* Changes the width of VLS to NEW_WIDTH. If VLS is numeric,
- NEW_WIDTH must be 0, otherwise it must be within the range
- 1...MAX_SHORT_STRING inclusive. */
-void
-val_labs_set_width (struct val_labs *vls, int new_width)
-{
- assert (vls != NULL);
- assert ((vls->width == 0) == (new_width == 0));
-
- vls->width = new_width;
-}
-
-/* Destroys VLS. */
-void
-val_labs_destroy (struct val_labs *vls)
-{
- if (vls != NULL)
- {
- if (vls->labels != NULL)
- hsh_destroy (vls->labels);
- free (vls);
- }
-}
-
-/* Removes all the value labels from VLS. */
-void
-val_labs_clear (struct val_labs *vls)
-{
- assert (vls != NULL);
-
- hsh_destroy (vls->labels);
- vls->labels = NULL;
-}
-
-/* Returns the number of value labels in VLS. */
-size_t
-val_labs_count (const struct val_labs *vls)
-{
- assert (vls != NULL);
-
- if (vls->labels == NULL)
- return 0;
- else
- return hsh_count (vls->labels);
-}
-\f
-/* One value label in internal format. */
-struct int_val_lab
- {
- union value value; /* The value being labeled. */
- struct atom *label; /* A ref-counted string. */
- };
-
-/* Creates and returns an int_val_lab based on VALUE and
- LABEL. */
-static struct int_val_lab *
-create_int_val_lab (struct val_labs *vls, union value value, const char *label)
-{
- struct int_val_lab *ivl;
-
- assert (label != NULL);
- assert (vls->width <= MAX_SHORT_STRING);
-
- ivl = xmalloc (sizeof *ivl);
- ivl->value = value;
- if (vls->width > 0)
- memset (ivl->value.s + vls->width, ' ', MAX_SHORT_STRING - vls->width);
- ivl->label = atom_create (label);
-
- return ivl;
-}
-
-/* If VLS does not already contain a value label for VALUE, adds
- LABEL for it and returns nonzero. Otherwise, returns zero.
- Behavior is undefined if VLS's width is greater than
- MAX_SHORT_STRING. */
-int
-val_labs_add (struct val_labs *vls, union value value, const char *label)
-{
- struct int_val_lab *ivl;
- void **vlpp;
-
- assert (vls != NULL);
- assert (vls->width <= MAX_SHORT_STRING);
- assert (label != NULL);
-
- if (vls->labels == NULL)
- vls->labels = hsh_create (8, compare_int_val_lab, hash_int_val_lab,
- free_int_val_lab, vls);
-
- ivl = create_int_val_lab (vls, value, label);
- vlpp = hsh_probe (vls->labels, ivl);
- if (*vlpp == NULL)
- {
- *vlpp = ivl;
- return 1;
- }
- else
- {
- free_int_val_lab (ivl, vls);
- return 0;
- }
-}
-
-/* Sets LABEL as the value label for VALUE in VLS. Returns zero
- if there wasn't already a value label for VALUE, or nonzero if
- there was. Behavior is undefined if VLS's width is greater
- than MAX_SHORT_STRING. */
-int
-val_labs_replace (struct val_labs *vls, union value value, const char *label)
-{
- struct int_val_lab *ivl;
-
- assert (vls != NULL);
- assert (vls->width <= MAX_SHORT_STRING);
- assert (label != NULL);
-
- if (vls->labels == NULL)
- {
- val_labs_add (vls, value, label);
- return 0;
- }
-
- ivl = hsh_replace (vls->labels, create_int_val_lab (vls, value, label));
- if (ivl == NULL)
- return 0;
- else
- {
- free_int_val_lab (ivl, vls);
- return 1;
- }
-}
-
-/* Removes any value label for VALUE within VLS. Returns nonzero
- if a value label was removed. Behavior is undefined if VLS's
- width is greater than MAX_SHORT_STRING. */
-int
-val_labs_remove (struct val_labs *vls, union value value)
-{
- assert (vls != NULL);
- assert (vls->width <= MAX_SHORT_STRING);
-
- if (vls->labels != NULL)
- {
- struct int_val_lab *ivl = create_int_val_lab (vls, value, "");
- int deleted = hsh_delete (vls->labels, ivl);
- free (ivl);
- return deleted;
- }
- else
- return 0;
-}
-
-/* Searches VLS for a value label for VALUE. If successful,
- returns the label; otherwise, returns a null pointer. If
- VLS's width is greater than MAX_SHORT_STRING, always returns a
- null pointer. */
-char *
-val_labs_find (const struct val_labs *vls, union value value)
-{
- assert (vls != NULL);
-
- if (vls->width > MAX_SHORT_STRING)
- return NULL;
-
- if (vls->labels != NULL)
- {
- struct int_val_lab ivl, *vlp;
-
- ivl.value = value;
- vlp = hsh_find (vls->labels, &ivl);
- if (vlp != NULL)
- return atom_to_string (vlp->label);
- }
- return NULL;
-}
-\f
-/* A value labels iterator. */
-struct val_labs_iterator
- {
- void **labels; /* The labels, in order. */
- void **lp; /* Current label. */
- struct val_lab vl; /* Structure presented to caller. */
- };
-
-/* Sets up *IP for iterating through the value labels in VLS in
- no particular order. Returns the first value label or a null
- pointer if VLS is empty. If the return value is non-null,
- then val_labs_next() may be used to continue iterating or
- val_labs_done() to free up the iterator. Otherwise, neither
- function may be called for *IP. */
-struct val_lab *
-val_labs_first (const struct val_labs *vls, struct val_labs_iterator **ip)
-{
- struct val_labs_iterator *i;
-
- assert (vls != NULL);
- assert (ip != NULL);
-
- if (vls->labels == NULL || vls->width > MAX_SHORT_STRING)
- return NULL;
-
- i = *ip = xmalloc (sizeof *i);
- i->labels = hsh_data_copy (vls->labels);
- i->lp = i->labels;
- return val_labs_next (vls, ip);
-}
-
-/* Sets up *IP for iterating through the value labels in VLS in
- sorted order of values. Returns the first value label or a
- null pointer if VLS is empty. If the return value is
- non-null, then val_labs_next() may be used to continue
- iterating or val_labs_done() to free up the iterator.
- Otherwise, neither function may be called for *IP. */
-struct val_lab *
-val_labs_first_sorted (const struct val_labs *vls,
- struct val_labs_iterator **ip)
-{
- struct val_labs_iterator *i;
-
- assert (vls != NULL);
- assert (ip != NULL);
-
- if (vls->labels == NULL || vls->width > MAX_SHORT_STRING)
- return NULL;
-
- i = *ip = xmalloc (sizeof *i);
- i->lp = i->labels = hsh_sort_copy (vls->labels);
- return val_labs_next (vls, ip);
-}
-
-/* Returns the next value label in an iteration begun by
- val_labs_first() or val_labs_first_sorted(). If the return
- value is non-null, then val_labs_next() may be used to
- continue iterating or val_labs_done() to free up the iterator.
- Otherwise, neither function may be called for *IP. */
-struct val_lab *
-val_labs_next (const struct val_labs *vls, struct val_labs_iterator **ip)
-{
- struct val_labs_iterator *i;
- struct int_val_lab *ivl;
-
- assert (vls != NULL);
- assert (vls->width <= MAX_SHORT_STRING);
- assert (ip != NULL);
- assert (*ip != NULL);
-
- i = *ip;
- ivl = *i->lp++;
- if (ivl != NULL)
- {
- i->vl.value = ivl->value;
- i->vl.label = atom_to_string (ivl->label);
- return &i->vl;
- }
- else
- {
- free (i->labels);
- free (i);
- *ip = NULL;
- return NULL;
- }
-}
-
-/* Discards the state for an incomplete iteration begun by
- val_labs_first() or val_labs_first_sorted(). */
-void
-val_labs_done (struct val_labs_iterator **ip)
-{
- struct val_labs_iterator *i;
-
- assert (ip != NULL);
- assert (*ip != NULL);
-
- i = *ip;
- free (i->labels);
- free (i);
- *ip = NULL;
-}
-\f
-/* Compares two value labels and returns a strcmp()-type result. */
-int
-compare_int_val_lab (const void *a_, const void *b_, void *vls_)
-{
- const struct int_val_lab *a = a_;
- const struct int_val_lab *b = b_;
- const struct val_labs *vls = vls_;
-
- if (vls->width == 0)
- return a->value.f < b->value.f ? -1 : a->value.f > b->value.f;
- else
- return memcmp (a->value.s, b->value.s, vls->width);
-}
-
-/* Hash a value label. */
-unsigned
-hash_int_val_lab (const void *vl_, void *vls_)
-{
- const struct int_val_lab *vl = vl_;
- const struct val_labs *vls = vls_;
-
- if (vls->width == 0)
- return hsh_hash_double (vl->value.f);
- else
- return hsh_hash_bytes (vl->value.s, sizeof vl->value.s);
-}
-
-/* Free a value label. */
-void
-free_int_val_lab (void *vl_, void *vls_ UNUSED)
-{
- struct int_val_lab *vl = vl_;
-
- atom_destroy (vl->label);
- free (vl);
-}
-\f
-/* Atoms. */
-
-/* An atom. */
-struct atom
- {
- char *string; /* String value. */
- unsigned ref_count; /* Number of references. */
- };
-
-static hsh_compare_func compare_atoms;
-static hsh_hash_func hash_atom;
-static hsh_free_func free_atom;
-
-/* Hash table of atoms. */
-static struct hsh_table *atoms;
-
-/* Creates and returns an atom for STRING. */
-static struct atom *
-atom_create (const char *string)
-{
- struct atom a;
- void **app;
-
- assert (string != NULL);
-
- if (atoms == NULL)
- atoms = hsh_create (8, compare_atoms, hash_atom, free_atom, NULL);
-
- a.string = (char *) string;
- app = hsh_probe (atoms, &a);
- if (*app != NULL)
- {
- struct atom *ap = *app;
- ap->ref_count++;
- return ap;
- }
- else
- {
- struct atom *ap = xmalloc (sizeof *ap);
- ap->string = xstrdup (string);
- ap->ref_count = 1;
- *app = ap;
- return ap;
- }
-}
-
-/* Destroys ATOM. */
-static void
-atom_destroy (struct atom *atom)
-{
- if (atom != NULL)
- {
- assert (atom->ref_count > 0);
- atom->ref_count--;
- if (atom->ref_count == 0)
- hsh_force_delete (atoms, atom);
- }
-}
-
-/* Returns the string associated with ATOM. */
-static char *
-atom_to_string (const struct atom *atom)
-{
- assert (atom != NULL);
-
- return atom->string;
-}
-
-/* A hsh_compare_func that compares A and B. */
-static int
-compare_atoms (const void *a_, const void *b_, void *aux UNUSED)
-{
- const struct atom *a = a_;
- const struct atom *b = b_;
-
- return strcmp (a->string, b->string);
-}
-
-/* A hsh_hash_func that hashes ATOM. */
-static unsigned
-hash_atom (const void *atom_, void *aux UNUSED)
-{
- const struct atom *atom = atom_;
-
- return hsh_hash_string (atom->string);
-}
-
-/* A hsh_free_func that destroys ATOM. */
-static void
-free_atom (void *atom_, void *aux UNUSED)
-{
- struct atom *atom = atom_;
-
- free (atom->string);
- free (atom);
-}
-
-
-/* Get a string representing the value.
- That is, if it has a label, then return that label,
- otherwise, if the value is alpha, then return the string for it,
- else format it and return the formatted string
-*/
-const char *
-value_to_string (const union value *val, const struct variable *var)
-{
- char *s;
-
- assert (val != NULL);
- assert (var != NULL);
-
- s = val_labs_find (var->val_labs, *val);
- if (s == NULL)
- {
- static char buf[256];
- if (var->width != 0)
- str_copy_buf_trunc (buf, sizeof buf, val->s, var->width);
- else
- snprintf(buf, 100, "%g", val->f);
- s = buf;
- }
-
- return s;
-}
projects / pspp-builds.git / blobdiff