1 /* PSPP - computes sample statistics.
2 Copyright (C) 1997-9, 2000 Free Software Foundation, Inc.
3 Written by Ben Pfaff <blp@gnu.org>.
5 This program is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 This program is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 #include "dictionary.h"
24 #include "algorithm.h"
33 #include "value-labels.h"
37 #define _(msgid) gettext (msgid)
42 struct variable **var; /* Variables. */
43 size_t var_cnt, var_cap; /* Number of variables, capacity. */
44 struct hsh_table *name_tab; /* Variable index by name. */
45 int next_value_idx; /* Index of next `union value' to allocate. */
46 struct variable **split; /* SPLIT FILE vars. */
47 size_t split_cnt; /* SPLIT FILE count. */
48 struct variable *weight; /* WEIGHT variable. */
49 struct variable *filter; /* FILTER variable. */
50 int case_limit; /* Current case limit (N command). */
51 char *label; /* File label. */
52 char *documents; /* Documents, as a string. */
53 struct vector **vector; /* Vectors of variables. */
54 size_t vector_cnt; /* Number of vectors. */
57 /* Creates and returns a new dictionary. */
61 struct dictionary *d = xmalloc (sizeof *d);
64 d->var_cnt = d->var_cap = 0;
65 d->name_tab = hsh_create (8, compare_var_names, hash_var_name, NULL, NULL);
66 d->next_value_idx = 0;
80 /* Creates and returns a (deep) copy of an existing
83 dict_clone (const struct dictionary *s)
92 for (i = 0; i < s->var_cnt; i++)
94 struct variable *sv = s->var[i];
95 struct variable *dv = dict_clone_var_assert (d, sv, sv->name);
96 var_set_short_name (dv, sv->short_name);
99 d->next_value_idx = s->next_value_idx;
101 d->split_cnt = s->split_cnt;
102 if (d->split_cnt > 0)
104 d->split = xnmalloc (d->split_cnt, sizeof *d->split);
105 for (i = 0; i < d->split_cnt; i++)
106 d->split[i] = dict_lookup_var_assert (d, s->split[i]->name);
109 if (s->weight != NULL)
110 d->weight = dict_lookup_var_assert (d, s->weight->name);
112 if (s->filter != NULL)
113 d->filter = dict_lookup_var_assert (d, s->filter->name);
115 d->case_limit = s->case_limit;
116 dict_set_label (d, dict_get_label (s));
117 dict_set_documents (d, dict_get_documents (s));
119 d->vector_cnt = s->vector_cnt;
120 d->vector = xnmalloc (d->vector_cnt, sizeof *d->vector);
121 for (i = 0; i < s->vector_cnt; i++)
123 struct vector *sv = s->vector[i];
124 struct vector *dv = d->vector[i] = xmalloc (sizeof *dv);
128 strcpy (dv->name, sv->name);
130 dv->var = xnmalloc (dv->cnt, sizeof *dv->var);
131 for (j = 0; j < dv->cnt; j++)
132 dv->var[j] = d->var[sv->var[j]->index];
138 /* Clears the contents from a dictionary without destroying the
139 dictionary itself. */
141 dict_clear (struct dictionary *d)
143 /* FIXME? Should we really clear case_limit, label, documents?
144 Others are necessarily cleared by deleting all the variables.*/
149 for (i = 0; i < d->var_cnt; i++)
151 struct variable *v = d->var[i];
153 val_labs_destroy (v->val_labs);
159 d->var_cnt = d->var_cap = 0;
160 hsh_clear (d->name_tab);
161 d->next_value_idx = 0;
172 dict_clear_vectors (d);
175 /* Destroys the aux data for every variable in D, by calling
176 var_clear_aux() for each variable. */
178 dict_clear_aux (struct dictionary *d)
184 for (i = 0; i < d->var_cnt; i++)
185 var_clear_aux (d->var[i]);
188 /* Clears a dictionary and destroys it. */
190 dict_destroy (struct dictionary *d)
195 hsh_destroy (d->name_tab);
200 /* Returns the number of variables in D. */
202 dict_get_var_cnt (const struct dictionary *d)
209 /* Returns the variable in D with index IDX, which must be
210 between 0 and the count returned by dict_get_var_cnt(),
213 dict_get_var (const struct dictionary *d, size_t idx)
216 assert (idx < d->var_cnt);
221 /* Sets *VARS to an array of pointers to variables in D and *CNT
222 to the number of variables in *D. By default all variables
223 are returned, but bits may be set in EXCLUDE_CLASSES to
224 exclude ordinary, system, and/or scratch variables. */
226 dict_get_vars (const struct dictionary *d, struct variable ***vars,
227 size_t *cnt, unsigned exclude_classes)
233 assert (vars != NULL);
234 assert (cnt != NULL);
235 assert ((exclude_classes & ~((1u << DC_ORDINARY)
237 | (1u << DC_SCRATCH))) == 0);
240 for (i = 0; i < d->var_cnt; i++)
241 if (!(exclude_classes & (1u << dict_class_from_id (d->var[i]->name))))
244 *vars = xnmalloc (count, sizeof **vars);
246 for (i = 0; i < d->var_cnt; i++)
247 if (!(exclude_classes & (1u << dict_class_from_id (d->var[i]->name))))
248 (*vars)[(*cnt)++] = d->var[i];
249 assert (*cnt == count);
253 /* Creates and returns a new variable in D with the given NAME
254 and WIDTH. Returns a null pointer if the given NAME would
255 duplicate that of an existing variable in the dictionary. */
257 dict_create_var (struct dictionary *d, const char *name, int width)
262 assert (name != NULL);
264 assert (width >= 0 && width < 256);
266 assert (var_is_valid_name(name,0));
268 /* Make sure there's not already a variable by that name. */
269 if (dict_lookup_var (d, name) != NULL)
272 /* Allocate and initialize variable. */
273 v = xmalloc (sizeof *v);
274 str_copy_trunc (v->name, sizeof v->name, name);
275 v->type = width == 0 ? NUMERIC : ALPHA;
277 v->fv = d->next_value_idx;
278 v->nv = width == 0 ? 1 : DIV_RND_UP (width, 8);
280 v->reinit = dict_class_from_id (v->name) != DC_SCRATCH;
281 v->index = d->var_cnt;
282 mv_init (&v->miss, width);
283 if (v->type == NUMERIC)
286 v->alignment = ALIGN_RIGHT;
287 v->display_width = 8;
288 v->measure = MEASURE_SCALE;
292 v->print = make_output_format (FMT_A, v->width, 0);
293 v->alignment = ALIGN_LEFT;
294 v->display_width = 8;
295 v->measure = MEASURE_NOMINAL;
298 v->val_labs = val_labs_create (v->width);
300 var_clear_short_name (v);
305 /* Update dictionary. */
306 if (d->var_cnt >= d->var_cap)
308 d->var_cap = 8 + 2 * d->var_cap;
309 d->var = xnrealloc (d->var, d->var_cap, sizeof *d->var);
311 d->var[v->index] = v;
313 hsh_force_insert (d->name_tab, v);
315 d->next_value_idx += v->nv;
320 /* Creates and returns a new variable in D with the given NAME
321 and WIDTH. Assert-fails if the given NAME would duplicate
322 that of an existing variable in the dictionary. */
324 dict_create_var_assert (struct dictionary *d, const char *name, int width)
326 struct variable *v = dict_create_var (d, name, width);
331 /* Creates and returns a new variable in D with name NAME, as a
332 copy of existing variable OV, which need not be in D or in any
333 dictionary. Returns a null pointer if the given NAME would
334 duplicate that of an existing variable in the dictionary. */
336 dict_clone_var (struct dictionary *d, const struct variable *ov,
343 assert (name != NULL);
345 assert (strlen (name) >= 1);
346 assert (strlen (name) <= LONG_NAME_LEN);
348 nv = dict_create_var (d, name, ov->width);
352 /* Copy most members not copied via dict_create_var().
353 short_name[] is intentionally not copied, because there is
354 no reason to give a new variable with potentially a new name
355 the same short name. */
357 nv->reinit = ov->reinit;
358 mv_copy (&nv->miss, &ov->miss);
359 nv->print = ov->print;
360 nv->write = ov->write;
361 val_labs_destroy (nv->val_labs);
362 nv->val_labs = val_labs_copy (ov->val_labs);
363 if (ov->label != NULL)
364 nv->label = xstrdup (ov->label);
365 nv->measure = ov->measure;
366 nv->display_width = ov->display_width;
367 nv->alignment = ov->alignment;
372 /* Creates and returns a new variable in D with name NAME, as a
373 copy of existing variable OV, which need not be in D or in any
374 dictionary. Assert-fails if the given NAME would duplicate
375 that of an existing variable in the dictionary. */
377 dict_clone_var_assert (struct dictionary *d, const struct variable *ov,
380 struct variable *v = dict_clone_var (d, ov, name);
385 /* Returns the variable named NAME in D, or a null pointer if no
386 variable has that name. */
388 dict_lookup_var (const struct dictionary *d, const char *name)
393 assert (name != NULL);
395 str_copy_trunc (v.name, sizeof v.name, name);
396 return hsh_find (d->name_tab, &v);
399 /* Returns the variable named NAME in D. Assert-fails if no
400 variable has that name. */
402 dict_lookup_var_assert (const struct dictionary *d, const char *name)
404 struct variable *v = dict_lookup_var (d, name);
409 /* Returns nonzero if variable V is in dictionary D. */
411 dict_contains_var (const struct dictionary *d, const struct variable *v)
416 return v->index >= 0 && v->index < d->var_cnt && d->var[v->index] == v;
419 /* Compares two double pointers to variables, which should point
420 to elements of a struct dictionary's `var' member array. */
422 compare_var_ptrs (const void *a_, const void *b_, void *aux UNUSED)
424 struct variable *const *a = a_;
425 struct variable *const *b = b_;
427 return *a < *b ? -1 : *a > *b;
430 /* Deletes variable V from dictionary D and frees V.
432 This is a very bad idea if there might be any pointers to V
433 from outside D. In general, no variable in default_dict
434 should be deleted when any transformations are active, because
435 those transformations might reference the deleted variable.
436 The safest time to delete a variable is just after a procedure
437 has been executed, as done by MODIFY VARS.
439 Pointers to V within D are not a problem, because
440 dict_delete_var() knows to remove V from split variables,
441 weights, filters, etc. */
443 dict_delete_var (struct dictionary *d, struct variable *v)
449 assert (dict_contains_var (d, v));
451 /* Delete aux data. */
454 /* Remove V from splits, weight, filter variables. */
455 d->split_cnt = remove_equal (d->split, d->split_cnt, sizeof *d->split,
456 &v, compare_var_ptrs, NULL);
461 dict_clear_vectors (d);
463 /* Remove V from var array. */
464 remove_element (d->var, d->var_cnt, sizeof *d->var, v->index);
468 for (i = v->index; i < d->var_cnt; i++)
469 d->var[i]->index = i;
471 /* Update name hash. */
472 hsh_force_delete (d->name_tab, v);
475 val_labs_destroy (v->val_labs);
476 cat_stored_values_destroy (v);
481 /* Deletes the COUNT variables listed in VARS from D. This is
482 unsafe; see the comment on dict_delete_var() for details. */
484 dict_delete_vars (struct dictionary *d,
485 struct variable *const *vars, size_t count)
487 /* FIXME: this can be done in O(count) time, but this algorithm
490 assert (count == 0 || vars != NULL);
493 dict_delete_var (d, *vars++);
496 /* Deletes scratch variables from dictionary D. */
498 dict_delete_scratch_vars (struct dictionary *d)
502 /* FIXME: this can be done in O(count) time, but this algorithm
506 for (i = 0; i < d->var_cnt; )
507 if (dict_class_from_id (d->var[i]->name) == DC_SCRATCH)
508 dict_delete_var (d, d->var[i]);
513 /* Moves V to 0-based position IDX in D. Other variables in D,
514 if any, retain their relative positions. Runs in time linear
515 in the distance moved. */
517 dict_reorder_var (struct dictionary *d, struct variable *v,
520 size_t min_idx, max_idx;
525 assert (dict_contains_var (d, v));
526 assert (new_index < d->var_cnt);
528 move_element (d->var, d->var_cnt, sizeof *d->var, v->index, new_index);
530 min_idx = min (v->index, new_index);
531 max_idx = max (v->index, new_index);
532 for (i = min_idx; i <= max_idx; i++)
533 d->var[i]->index = i;
536 /* Reorders the variables in D, placing the COUNT variables
537 listed in ORDER in that order at the beginning of D. The
538 other variables in D, if any, retain their relative
541 dict_reorder_vars (struct dictionary *d,
542 struct variable *const *order, size_t count)
544 struct variable **new_var;
548 assert (count == 0 || order != NULL);
549 assert (count <= d->var_cnt);
551 new_var = xnmalloc (d->var_cnt, sizeof *new_var);
552 memcpy (new_var, order, count * sizeof *new_var);
553 for (i = 0; i < count; i++)
555 assert (d->var[order[i]->index] != NULL);
556 d->var[order[i]->index] = NULL;
559 for (i = 0; i < d->var_cnt; i++)
560 if (d->var[i] != NULL)
562 assert (count < d->var_cnt);
563 new_var[count] = d->var[i];
564 new_var[count]->index = count;
571 /* Changes the name of V in D to name NEW_NAME. Assert-fails if
572 a variable named NEW_NAME is already in D, except that
573 NEW_NAME may be the same as V's existing name. */
575 dict_rename_var (struct dictionary *d, struct variable *v,
576 const char *new_name)
580 assert (new_name != NULL);
581 assert (var_is_valid_name (new_name, false));
582 assert (dict_contains_var (d, v));
583 assert (!compare_var_names (v->name, new_name, NULL)
584 || dict_lookup_var (d, new_name) == NULL);
586 hsh_force_delete (d->name_tab, v);
587 str_copy_trunc (v->name, sizeof v->name, new_name);
588 hsh_force_insert (d->name_tab, v);
590 if (get_algorithm () == ENHANCED)
591 var_clear_short_name (v);
594 /* Renames COUNT variables specified in VARS to the names given
595 in NEW_NAMES within dictionary D. If the renaming would
596 result in a duplicate variable name, returns zero and stores a
597 name that would be duplicated into *ERR_NAME (if ERR_NAME is
598 non-null). Otherwise, the renaming is successful, and nonzero
601 dict_rename_vars (struct dictionary *d,
602 struct variable **vars, char **new_names,
603 size_t count, char **err_name)
610 assert (count == 0 || vars != NULL);
611 assert (count == 0 || new_names != NULL);
613 /* Remove the variables to be renamed from the name hash,
614 save their names, and rename them. */
615 old_names = xnmalloc (count, sizeof *old_names);
616 for (i = 0; i < count; i++)
618 assert (d->var[vars[i]->index] == vars[i]);
619 assert (var_is_valid_name (new_names[i], false));
620 hsh_force_delete (d->name_tab, vars[i]);
621 old_names[i] = xstrdup (vars[i]->name);
622 strcpy (vars[i]->name, new_names[i]);
625 /* Add the renamed variables back into the name hash,
626 checking for conflicts. */
627 for (i = 0; i < count; i++)
629 assert (new_names[i] != NULL);
630 assert (*new_names[i] != '\0');
631 assert (strlen (new_names[i]) >= 1);
632 assert (strlen (new_names[i]) <= LONG_NAME_LEN);
634 if (hsh_insert (d->name_tab, vars[i]) != NULL)
636 /* There is a name conflict.
637 Back out all the name changes that have already
638 taken place, and indicate failure. */
640 if (err_name != NULL)
641 *err_name = new_names[i];
643 for (i = 0; i < fail_idx; i++)
644 hsh_force_delete (d->name_tab, vars[i]);
646 for (i = 0; i < count; i++)
648 strcpy (vars[i]->name, old_names[i]);
649 hsh_force_insert (d->name_tab, vars[i]);
657 /* Clear short names. */
658 if (get_algorithm () == ENHANCED)
659 for (i = 0; i < count; i++)
660 var_clear_short_name (vars[i]);
663 /* Free the old names we kept around. */
664 for (i = 0; i < count; i++)
671 /* Returns the weighting variable in dictionary D, or a null
672 pointer if the dictionary is unweighted. */
674 dict_get_weight (const struct dictionary *d)
677 assert (d->weight == NULL || dict_contains_var (d, d->weight));
682 /* Returns the value of D's weighting variable in case C, except that a
683 negative weight is returned as 0. Returns 1 if the dictionary is
684 unweighted. Will warn about missing, negative, or zero values if
685 warn_on_invalid is nonzero. The function will set warn_on_invalid to zero
686 if an invalid weight is found. */
688 dict_get_case_weight (const struct dictionary *d, const struct ccase *c,
689 int *warn_on_invalid)
694 if (d->weight == NULL)
698 double w = case_num (c, d->weight->fv);
699 if (w < 0.0 || mv_is_num_missing (&d->weight->miss, w))
701 if ( w == 0.0 && *warn_on_invalid ) {
702 *warn_on_invalid = 0;
703 msg (SW, _("At least one case in the data file had a weight value "
704 "that was user-missing, system-missing, zero, or "
705 "negative. These case(s) were ignored."));
711 /* Sets the weighting variable of D to V, or turning off
712 weighting if V is a null pointer. */
714 dict_set_weight (struct dictionary *d, struct variable *v)
717 assert (v == NULL || dict_contains_var (d, v));
718 assert (v == NULL || v->type == NUMERIC);
723 /* Returns the filter variable in dictionary D (see cmd_filter())
724 or a null pointer if the dictionary is unfiltered. */
726 dict_get_filter (const struct dictionary *d)
729 assert (d->filter == NULL || dict_contains_var (d, d->filter));
734 /* Sets V as the filter variable for dictionary D. Passing a
735 null pointer for V turn off filtering. */
737 dict_set_filter (struct dictionary *d, struct variable *v)
740 assert (v == NULL || dict_contains_var (d, v));
745 /* Returns the case limit for dictionary D, or zero if the number
746 of cases is unlimited (see cmd_n()). */
748 dict_get_case_limit (const struct dictionary *d)
752 return d->case_limit;
755 /* Sets CASE_LIMIT as the case limit for dictionary D. Zero for
756 CASE_LIMIT indicates no limit. */
758 dict_set_case_limit (struct dictionary *d, int case_limit)
761 assert (case_limit >= 0);
763 d->case_limit = case_limit;
766 /* Returns the index of the next value to be added to D. This
767 value is the number of `union value's that need to be
768 allocated to store a case for dictionary D. */
770 dict_get_next_value_idx (const struct dictionary *d)
774 return d->next_value_idx;
777 /* Returns the number of bytes needed to store a case for
780 dict_get_case_size (const struct dictionary *d)
784 return sizeof (union value) * dict_get_next_value_idx (d);
787 /* Deletes scratch variables in dictionary D and reassigns values
788 so that fragmentation is eliminated. */
790 dict_compact_values (struct dictionary *d)
794 d->next_value_idx = 0;
795 for (i = 0; i < d->var_cnt; )
797 struct variable *v = d->var[i];
799 if (dict_class_from_id (v->name) != DC_SCRATCH)
801 v->fv = d->next_value_idx;
802 d->next_value_idx += v->nv;
806 dict_delete_var (d, v);
810 /* Copies values from SRC, which represents a case arranged
811 according to dictionary D, to DST, which represents a case
812 arranged according to the dictionary that will be produced by
813 dict_compact_values(D). */
815 dict_compact_case (const struct dictionary *d,
816 struct ccase *dst, const struct ccase *src)
822 for (i = 0; i < d->var_cnt; i++)
824 struct variable *v = d->var[i];
826 if (dict_class_from_id (v->name) != DC_SCRATCH)
828 case_copy (dst, value_idx, src, v->fv, v->nv);
834 /* Returns the number of values that would be used by a case if
835 dict_compact_values() were called. */
837 dict_get_compacted_value_cnt (const struct dictionary *d)
843 for (i = 0; i < d->var_cnt; i++)
844 if (dict_class_from_id (d->var[i]->name) != DC_SCRATCH)
845 cnt += d->var[i]->nv;
849 /* Creates and returns an array mapping from a dictionary index
850 to the `fv' that the corresponding variable will have after
851 calling dict_compact_values(). Scratch variables receive -1
852 for `fv' because dict_compact_values() will delete them. */
854 dict_get_compacted_idx_to_fv (const struct dictionary *d)
857 size_t next_value_idx;
860 idx_to_fv = xnmalloc (d->var_cnt, sizeof *idx_to_fv);
862 for (i = 0; i < d->var_cnt; i++)
864 struct variable *v = d->var[i];
866 if (dict_class_from_id (v->name) != DC_SCRATCH)
868 idx_to_fv[i] = next_value_idx;
869 next_value_idx += v->nv;
877 /* Returns the SPLIT FILE vars (see cmd_split_file()). Call
878 dict_get_split_cnt() to determine how many SPLIT FILE vars
879 there are. Returns a null pointer if and only if there are no
881 struct variable *const *
882 dict_get_split_vars (const struct dictionary *d)
889 /* Returns the number of SPLIT FILE vars. */
891 dict_get_split_cnt (const struct dictionary *d)
898 /* Sets CNT split vars SPLIT in dictionary D. */
900 dict_set_split_vars (struct dictionary *d,
901 struct variable *const *split, size_t cnt)
904 assert (cnt == 0 || split != NULL);
907 d->split = xnrealloc (d->split, cnt, sizeof *d->split);
908 memcpy (d->split, split, cnt * sizeof *d->split);
911 /* Returns the file label for D, or a null pointer if D is
912 unlabeled (see cmd_file_label()). */
914 dict_get_label (const struct dictionary *d)
921 /* Sets D's file label to LABEL, truncating it to a maximum of 60
924 dict_set_label (struct dictionary *d, const char *label)
931 else if (strlen (label) < 60)
932 d->label = xstrdup (label);
935 d->label = xmalloc (61);
936 memcpy (d->label, label, 60);
941 /* Returns the documents for D, or a null pointer if D has no
942 documents (see cmd_document()).. */
944 dict_get_documents (const struct dictionary *d)
951 /* Sets the documents for D to DOCUMENTS, or removes D's
952 documents if DOCUMENT is a null pointer. */
954 dict_set_documents (struct dictionary *d, const char *documents)
959 if (documents == NULL)
962 d->documents = xstrdup (documents);
965 /* Creates in D a vector named NAME that contains CNT variables
966 VAR (see cmd_vector()). Returns nonzero if successful, or
967 zero if a vector named NAME already exists in D. */
969 dict_create_vector (struct dictionary *d,
971 struct variable **var, size_t cnt)
973 struct vector *vector;
977 assert (name != NULL);
978 assert (var_is_valid_name (name, false));
979 assert (var != NULL);
982 if (dict_lookup_vector (d, name) != NULL)
985 d->vector = xnrealloc (d->vector, d->vector_cnt + 1, sizeof *d->vector);
986 vector = d->vector[d->vector_cnt] = xmalloc (sizeof *vector);
987 vector->idx = d->vector_cnt++;
988 str_copy_trunc (vector->name, sizeof vector->name, name);
989 vector->var = xnmalloc (cnt, sizeof *var);
990 for (i = 0; i < cnt; i++)
992 assert (dict_contains_var (d, var[i]));
993 vector->var[i] = var[i];
1000 /* Returns the vector in D with index IDX, which must be less
1001 than dict_get_vector_cnt (D). */
1002 const struct vector *
1003 dict_get_vector (const struct dictionary *d, size_t idx)
1006 assert (idx < d->vector_cnt);
1008 return d->vector[idx];
1011 /* Returns the number of vectors in D. */
1013 dict_get_vector_cnt (const struct dictionary *d)
1017 return d->vector_cnt;
1020 /* Looks up and returns the vector within D with the given
1022 const struct vector *
1023 dict_lookup_vector (const struct dictionary *d, const char *name)
1028 assert (name != NULL);
1030 for (i = 0; i < d->vector_cnt; i++)
1031 if (!strcasecmp (d->vector[i]->name, name))
1032 return d->vector[i];
1036 /* Deletes all vectors from D. */
1038 dict_clear_vectors (struct dictionary *d)
1044 for (i = 0; i < d->vector_cnt; i++)
1046 free (d->vector[i]->var);
1047 free (d->vector[i]);
1054 /* Compares two strings. */
1056 compare_strings (const void *a, const void *b, void *aux UNUSED)
1058 return strcmp (a, b);
1061 /* Hashes a string. */
1063 hash_string (const void *s, void *aux UNUSED)
1065 return hsh_hash_string (s);
1068 /* Assigns a valid, unique short_name[] to each variable in D.
1069 Each variable whose actual name is short has highest priority
1070 for that short name. Otherwise, variables with an existing
1071 short_name[] have the next highest priority for a given short
1072 name; if it is already taken, then the variable is treated as
1073 if short_name[] had been empty. Otherwise, long names are
1074 truncated to form short names. If that causes conflicts,
1075 variables are renamed as PREFIX_A, PREFIX_B, and so on. */
1077 dict_assign_short_names (struct dictionary *d)
1079 struct hsh_table *short_names;
1082 /* Give variables whose names are short the corresponding short
1083 names, and clear short_names[] that conflict with a variable
1085 for (i = 0; i < d->var_cnt; i++)
1087 struct variable *v = d->var[i];
1088 if (strlen (v->name) <= SHORT_NAME_LEN)
1089 var_set_short_name (v, v->name);
1090 else if (dict_lookup_var (d, v->short_name) != NULL)
1091 var_clear_short_name (v);
1094 /* Each variable with an assigned short_name[] now gets it
1095 unless there is a conflict. */
1096 short_names = hsh_create (d->var_cnt, compare_strings, hash_string,
1098 for (i = 0; i < d->var_cnt; i++)
1100 struct variable *v = d->var[i];
1101 if (v->short_name[0] && hsh_insert (short_names, v->short_name) != NULL)
1102 var_clear_short_name (v);
1105 /* Now assign short names to remaining variables. */
1106 for (i = 0; i < d->var_cnt; i++)
1108 struct variable *v = d->var[i];
1109 if (v->short_name[0] == '\0')
1113 /* Form initial short_name. */
1114 var_set_short_name (v, v->name);
1116 /* Try _A, _B, ... _AA, _AB, etc., if needed. */
1117 for (sfx = 0; hsh_insert (short_names, v->short_name) != NULL; sfx++)
1118 var_set_short_name_suffix (v, v->name, sfx);
1122 /* Get rid of hash table. */
1123 hsh_destroy (short_names);