/* 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
#include <stdlib.h>
+#include <data/data-out.h>
+#include <data/format.h>
+#include <data/value.h>
#include <data/variable.h>
#include <libpspp/alloc.h>
#include <libpspp/compiler.h>
};
/* 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. */
+ given WIDTH. To actually add any value labels, WIDTH must be
+ a numeric or short string width. */
struct val_labs *
val_labs_create (int width)
{
struct val_labs_iterator *i;
struct val_lab *vl;
- assert (vls != NULL);
+ if (vls == NULL)
+ return NULL;
copy = val_labs_create (vls->width);
for (vl = val_labs_first (vls, &i); vl != NULL;
return copy;
}
+/* Determines whether VLS's width can be changed to NEW_WIDTH.
+ Numeric widths cannot be changed at all.
+ Strings can be widened. They can be shortened only if the
+ characters that will be truncated are spaces. */
+bool
+val_labs_can_set_width (const struct val_labs *vls, int new_width)
+{
+ assert ((vls->width == 0) == (new_width == 0));
+
+ if (vls->width == 0)
+ return new_width == 0;
+ else if (new_width < vls->width)
+ {
+ struct val_labs_iterator *i;
+ struct val_lab *lab;
+
+ for (lab = val_labs_first (vls, &i); lab != NULL;
+ lab = val_labs_next (vls, &i))
+ {
+ int j;
+
+ /* We can shorten the value labels only if all the
+ truncated characters are blanks. */
+ for (j = vls->width; j < new_width; j++)
+ if (lab->value.s[j] != ' ')
+ {
+ val_labs_done (&i);
+ return false;
+ }
+ }
+ return true;
+ }
+ else
+ return true;
+}
+
/* 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));
+ assert (val_labs_can_set_width (vls, new_width));
vls->width = new_width;
+ if (new_width > MAX_SHORT_STRING)
+ val_labs_clear (vls);
}
/* Destroys VLS. */
{
if (vls != NULL)
{
- if (vls->labels != NULL)
- hsh_destroy (vls->labels);
+ hsh_destroy (vls->labels);
free (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);
+ return vls == NULL || vls->labels == NULL ? 0 : hsh_count (vls->labels);
}
\f
/* One value label in internal format. */
}
/* If VLS does not already contain a value label for VALUE, adds
- LABEL for it and returns nonzero. Otherwise, returns zero.
+ LABEL for it and returns true. Otherwise, returns false.
Behavior is undefined if VLS's width is greater than
MAX_SHORT_STRING. */
-int
+bool
val_labs_add (struct val_labs *vls, union value value, const char *label)
{
struct int_val_lab *ivl;
if (*vlpp == NULL)
{
*vlpp = ivl;
- return 1;
- }
- else
- {
- free_int_val_lab (ivl, vls);
- return 0;
+ return true;
}
+ free_int_val_lab (ivl, vls);
+ return false;
}
-/* 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
+/* Sets LABEL as the value label for VALUE in VLS. Returns false
+ if there wasn't already a value label for VALUE, or true if
there was. Behavior is undefined if VLS's width is greater
than MAX_SHORT_STRING. */
-int
+void
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)
+ if (vls->labels != NULL)
{
- val_labs_add (vls, value, label);
- return 0;
+ struct int_val_lab *new = create_int_val_lab (vls, value, label);
+ struct int_val_lab *old = hsh_replace (vls->labels, new);
+ if (old != NULL)
+ free_int_val_lab (old, vls);
}
-
- 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;
- }
+ val_labs_add (vls, value, label);
}
-/* Removes any value label for VALUE within VLS. Returns nonzero
+/* Removes any value label for VALUE within VLS. Returns true
if a value label was removed. Behavior is undefined if VLS's
width is greater than MAX_SHORT_STRING. */
-int
+bool
val_labs_remove (struct val_labs *vls, union value value)
{
assert (vls != NULL);
return deleted;
}
else
- return 0;
+ return false;
}
/* Searches VLS for a value label for VALUE. If successful,
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)
+ if (vls != NULL
+ && vls->width <= MAX_SHORT_STRING
+ && vls->labels != NULL)
{
struct int_val_lab ivl, *vlp;
\f
/* Compares two value labels and returns a strcmp()-type result. */
int
-compare_int_val_lab (const void *a_, const void *b_, void *vls_)
+compare_int_val_lab (const void *a_, const void *b_, const void *vls_)
{
const struct int_val_lab *a = a_;
const struct int_val_lab *b = b_;
/* Hash a value label. */
unsigned
-hash_int_val_lab (const void *vl_, void *vls_)
+hash_int_val_lab (const void *vl_, const 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);
+ return hsh_hash_bytes (vl->value.s, vls->width);
}
/* Free a value label. */
void
-free_int_val_lab (void *vl_, void *vls_ UNUSED)
+free_int_val_lab (void *vl_, const void *vls_ UNUSED)
{
struct int_val_lab *vl = vl_;
/* Hash table of atoms. */
static struct hsh_table *atoms;
+static void
+destroy_atoms (void)
+{
+ hsh_destroy (atoms);
+}
+
/* Creates and returns an atom for STRING. */
static struct atom *
atom_create (const char *string)
assert (string != NULL);
if (atoms == NULL)
- atoms = hsh_create (8, compare_atoms, hash_atom, free_atom, NULL);
+ {
+ atoms = hsh_create (8, compare_atoms, hash_atom, free_atom, NULL);
+ atexit (destroy_atoms);
+ }
a.string = (char *) string;
app = hsh_probe (atoms, &a);
/* A hsh_compare_func that compares A and B. */
static int
-compare_atoms (const void *a_, const void *b_, void *aux UNUSED)
+compare_atoms (const void *a_, const void *b_, const void *aux UNUSED)
{
const struct atom *a = a_;
const struct atom *b = b_;
/* A hsh_hash_func that hashes ATOM. */
static unsigned
-hash_atom (const void *atom_, void *aux UNUSED)
+hash_atom (const void *atom_, const void *aux UNUSED)
{
const struct atom *atom = atom_;
/* A hsh_free_func that destroys ATOM. */
static void
-free_atom (void *atom_, void *aux UNUSED)
+free_atom (void *atom_, const 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