1 /* PSPP - computes sample statistics.
2 Copyright (C) 2006 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or
5 modify it under the terms of the GNU General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 This program is distributed in the hope that it will be useful, but
10 WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
22 #include "dictionary.h"
24 #include <libpspp/assertion.h>
25 #include <libpspp/str.h>
29 /* Vector of variables. */
32 char name[LONG_NAME_LEN + 1]; /* Name. */
33 struct variable **vars; /* Set of variables. */
34 size_t var_cnt; /* Number of variables. */
37 /* Checks that all the variables in VECTOR have consistent
40 check_widths (const struct vector *vector)
42 int width = var_get_width (vector->vars[0]);
45 for (i = 1; i < vector->var_cnt; i++)
46 assert (width == var_get_width (vector->vars[i]));
49 /* Creates and returns a new vector with the given NAME
50 that contains the VAR_CNT variables in VARS.
51 All variables in VARS must have the same type and width. */
53 vector_create (const char *name,
54 struct variable **vars, size_t var_cnt)
56 struct vector *vector = xmalloc (sizeof *vector);
59 assert (var_is_plausible_name (name, false));
60 str_copy_trunc (vector->name, sizeof vector->name, name);
62 vector->vars = xmemdup (vars, var_cnt * sizeof *vector->vars);
63 vector->var_cnt = var_cnt;
64 check_widths (vector);
69 /* Creates and returns a new vector as a clone of OLD, but that
70 contains variables from NEW_DICT that are in the same position
71 as those in OLD are in OLD_DICT.
72 All variables in the new vector must have the same type and
75 vector_clone (const struct vector *old,
76 const struct dictionary *old_dict,
77 const struct dictionary *new_dict)
79 struct vector *new = xmalloc (sizeof *new);
82 strcpy (new->name, old->name);
84 new->vars = xnmalloc (old->var_cnt, sizeof *new->vars);
85 new->var_cnt = old->var_cnt;
86 for (i = 0; i < new->var_cnt; i++)
88 assert (dict_contains_var (old_dict, old->vars[i]));
89 new->vars[i] = dict_get_var (new_dict,
90 var_get_dict_index (old->vars[i]));
97 /* Destroys VECTOR. */
99 vector_destroy (struct vector *vector)
105 /* Returns VECTOR's name. */
107 vector_get_name (const struct vector *vector)
112 /* Returns the type of the variables in VECTOR. */
113 enum var_type vector_get_type (const struct vector *vector)
115 return var_get_type (vector->vars[0]);
118 /* Returns the variable in VECTOR with the given INDEX. */
120 vector_get_var (const struct vector *vector, size_t index)
122 assert (index < vector->var_cnt);
123 return vector->vars[index];
126 /* Returns the number of variables in VECTOR. */
128 vector_get_var_cnt (const struct vector *vector)
130 return vector->var_cnt;
133 /* Compares two pointers to vectors represented by A and B and
134 returns a strcmp()-type result. */
136 compare_vector_ptrs_by_name (const void *a_, const void *b_)
138 struct vector *const *pa = a_;
139 struct vector *const *pb = b_;
140 struct vector *a = *pa;
141 struct vector *b = *pb;
143 return strcasecmp (a->name, b->name);