+++ /dev/null
-/* PSPP - a program for statistical analysis.
- Copyright (C) 1997-9, 2000, 2009, 2010, 2011, 2013 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 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.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
-
-#include <config.h>
-
-#include <ctype.h>
-#include <errno.h>
-#include <float.h>
-#include <limits.h>
-#include <stdlib.h>
-
-#include "data/case.h"
-#include "data/casereader.h"
-#include "data/casereader-provider.h"
-#include "data/dataset.h"
-#include "data/dictionary.h"
-#include "data/settings.h"
-#include "data/short-names.h"
-#include "data/value.h"
-#include "data/variable.h"
-#include "language/command.h"
-#include "language/lexer/lexer.h"
-#include "language/lexer/variable-parser.h"
-#include "libpspp/array.h"
-#include "libpspp/assertion.h"
-#include "libpspp/message.h"
-#include "libpspp/misc.h"
-#include "libpspp/pool.h"
-#include "libpspp/str.h"
-#include "data/data-in.h"
-#include "data/data-out.h"
-
-#include "gl/intprops.h"
-#include "gl/minmax.h"
-#include "gl/xalloc.h"
-
-#include "gettext.h"
-#define _(msgid) gettext (msgid)
-
-/* List of variable names. */
-struct var_names
- {
- const char **names;
- size_t n_names, allocated_names;
- };
-
-static void var_names_init (struct var_names *);
-static void var_names_add (struct pool *, struct var_names *, const char *);
-
-/* Represents a FLIP input program. */
-struct flip_pgm
- {
- struct pool *pool; /* Pool containing FLIP data. */
- size_t n_vars; /* Pre-flip number of variables. */
- int n_cases; /* Pre-flip number of cases. */
-
- struct variable *new_names_var; /* Variable with new variable names. */
- const char *encoding; /* Variable names' encoding. */
- struct var_names old_names; /* Variable names before FLIP. */
- struct var_names new_names; /* Variable names after FLIP. */
-
- FILE *file; /* Temporary file containing data. */
- size_t cases_read; /* Number of cases already read. */
- bool error; /* Error reading temporary file? */
- };
-
-static const struct casereader_class flip_casereader_class;
-
-static void destroy_flip_pgm (struct flip_pgm *);
-static bool flip_file (struct flip_pgm *);
-static void make_new_var (struct dictionary *, const char *name);
-
-/* Parses and executes FLIP. */
-int
-cmd_flip (struct lexer *lexer, struct dataset *ds)
-{
- struct dictionary *old_dict = dataset_dict (ds);
- struct dictionary *new_dict = NULL;
- const struct variable **vars;
- struct flip_pgm *flip;
- struct casereader *input, *reader;
- struct ccase *c;
- size_t i;
- bool ok;
-
- if (proc_make_temporary_transformations_permanent (ds))
- lex_ofs_msg (lexer, SW, 0, lex_ofs (lexer) - 1,
- _("%s ignores %s. "
- "Temporary transformations will be made permanent."),
- "FLIP", "TEMPORARY");
-
- flip = pool_create_container (struct flip_pgm, pool);
- flip->n_vars = 0;
- flip->n_cases = 0;
- flip->new_names_var = NULL;
- var_names_init (&flip->old_names);
- var_names_init (&flip->new_names);
- flip->file = NULL;
- flip->cases_read = 0;
- flip->error = false;
-
- lex_match (lexer, T_SLASH);
- if (lex_match_id (lexer, "VARIABLES"))
- {
- lex_match (lexer, T_EQUALS);
- if (!parse_variables_const (lexer, old_dict, &vars, &flip->n_vars,
- PV_NO_DUPLICATE))
- goto error;
- lex_match (lexer, T_SLASH);
- }
- else
- dict_get_vars (old_dict, &vars, &flip->n_vars, DC_SYSTEM);
- pool_register (flip->pool, free, vars);
-
- lex_match (lexer, T_SLASH);
- if (lex_match_id (lexer, "NEWNAMES"))
- {
- lex_match (lexer, T_EQUALS);
- flip->new_names_var = parse_variable (lexer, old_dict);
- if (!flip->new_names_var)
- goto error;
- }
- else
- flip->new_names_var = dict_lookup_var (old_dict, "CASE_LBL");
-
- if (flip->new_names_var)
- {
- for (i = 0; i < flip->n_vars; i++)
- if (vars[i] == flip->new_names_var)
- {
- remove_element (vars, flip->n_vars, sizeof *vars, i);
- flip->n_vars--;
- break;
- }
- }
- if (flip->n_vars <= 0)
- goto error;
-
- flip->file = pool_create_temp_file (flip->pool);
- if (flip->file == NULL)
- {
- msg (SE, _("Could not create temporary file for %s."), "FLIP");
- goto error;
- }
-
- /* Save old variable names for use as values of CASE_LBL
- variable in flipped file. */
- for (i = 0; i < flip->n_vars; i++)
- var_names_add (flip->pool, &flip->old_names,
- pool_strdup (flip->pool, var_get_name (vars[i])));
-
- /* Read the active dataset into a flip_sink. */
- proc_discard_output (ds);
-
- /* Save old dictionary. */
- new_dict = dict_clone (old_dict);
- flip->encoding = dict_get_encoding (new_dict);
- dict_clear (new_dict);
-
- input = proc_open_filtering (ds, false);
- while ((c = casereader_read (input)) != NULL)
- {
- flip->n_cases++;
- for (i = 0; i < flip->n_vars; i++)
- {
- const struct variable *v = vars[i];
- double out = var_is_numeric (v) ? case_num (c, v) : SYSMIS;
- fwrite (&out, sizeof out, 1, flip->file);
- }
- if (flip->new_names_var != NULL)
- {
- const union value *value = case_data (c, flip->new_names_var);
- const char *name;
- if (var_is_numeric (flip->new_names_var))
- {
- double f = value->f;
- name = (f == SYSMIS ? "VSYSMIS"
- : f < INT_MIN ? "VNEGINF"
- : f > INT_MAX ? "VPOSINF"
- : pool_asprintf (flip->pool, "V%d", (int) f));
- }
- else
- {
- name = data_out_pool (value, dict_get_encoding (old_dict),
- var_get_write_format (flip->new_names_var),
- settings_get_fmt_settings (), flip->pool);
- }
- var_names_add (flip->pool, &flip->new_names, name);
- }
- case_unref (c);
- }
- ok = casereader_destroy (input);
- ok = proc_commit (ds) && ok;
-
- /* Flip the data we read. */
- if (!ok || !flip_file (flip))
- {
- dataset_clear (ds);
- goto error;
- }
-
- /* Flip the dictionary. */
- dict_create_var_assert (new_dict, "CASE_LBL", 8);
- for (i = 0; i < flip->n_cases; i++)
- if (flip->new_names.n_names)
- make_new_var (new_dict, flip->new_names.names[i]);
- else
- {
- char s[3 + INT_STRLEN_BOUND (i) + 1];
- sprintf (s, "VAR%03zu", i);
- dict_create_var_assert (new_dict, s, 0);
- }
-
- /* Set up flipped data for reading. */
- reader = casereader_create_sequential (NULL, dict_get_proto (new_dict),
- flip->n_vars,
- &flip_casereader_class, flip);
- dataset_set_dict (ds, new_dict);
- dataset_set_source (ds, reader);
- return CMD_SUCCESS;
-
- error:
- dict_unref (new_dict);
- destroy_flip_pgm (flip);
- return CMD_CASCADING_FAILURE;
-}
-
-/* Destroys FLIP. */
-static void
-destroy_flip_pgm (struct flip_pgm *flip)
-{
- if (flip != NULL)
- pool_destroy (flip->pool);
-}
-
-/* Make a new variable with base name NAME, which is bowdlerized and
- mangled until acceptable. */
-static void
-make_new_var (struct dictionary *dict, const char *name_)
-{
- char *name = xstrdup (name_);
- char *cp;
-
- /* Trim trailing spaces. */
- cp = strchr (name, '\0');
- while (cp > name && isspace ((unsigned char) cp[-1]))
- *--cp = '\0';
-
- /* Fix invalid characters. */
- for (cp = name; *cp && cp < name + ID_MAX_LEN; cp++)
- if (cp == name)
- {
- if (!lex_is_id1 (*cp) || *cp == '$')
- *cp = 'V';
- }
- else
- {
- if (!lex_is_idn (*cp))
- *cp = '_';
- }
- *cp = '\0';
-
- if (strlen (name) == 0)
- {
- free (name);
- name = xstrdup ("v");
- }
-
- /* Use the mangled name, if it is available, or add numeric
- extensions until we find one that is. */
- if (!id_is_plausible (name) || !dict_create_var (dict, name, 0))
- {
- int len = strlen (name);
- int i;
- for (i = 1; ; i++)
- {
- char n[ID_MAX_LEN + 1];
- int ofs = MIN (ID_MAX_LEN - 1 - intlog10 (i), len);
- strncpy (n, name, ofs);
- sprintf (&n[ofs], "%d", i);
-
- if (id_is_plausible (n) && dict_create_var (dict, n, 0))
- break;
- }
- }
- free (name);
-}
-
-/* Transposes the external file into a new file. */
-static bool
-flip_file (struct flip_pgm *flip)
-{
- size_t case_bytes;
- size_t case_capacity;
- size_t case_idx;
- double *input_buf, *output_buf;
- FILE *input_file, *output_file;
-
- /* Allocate memory for many cases. */
- case_bytes = flip->n_vars * sizeof *input_buf;
- case_capacity = settings_get_workspace () / case_bytes;
- if (case_capacity > flip->n_cases * 2)
- case_capacity = flip->n_cases * 2;
- if (case_capacity < 2)
- case_capacity = 2;
- for (;;)
- {
- size_t bytes = case_bytes * case_capacity;
- if (case_capacity > 2)
- input_buf = malloc (bytes);
- else
- input_buf = xmalloc (bytes);
- if (input_buf != NULL)
- break;
-
- case_capacity /= 2;
- if (case_capacity < 2)
- case_capacity = 2;
- }
- pool_register (flip->pool, free, input_buf);
-
- /* Use half the allocated memory for input_buf, half for
- output_buf. */
- case_capacity /= 2;
- output_buf = input_buf + flip->n_vars * case_capacity;
-
- input_file = flip->file;
- if (fseeko (input_file, 0, SEEK_SET) != 0)
- {
- msg (SE, _("Error rewinding %s file: %s."), "FLIP", strerror (errno));
- return false;
- }
-
- output_file = pool_create_temp_file (flip->pool);
- if (output_file == NULL)
- {
- msg (SE, _("Error creating %s source file."), "FLIP");
- return false;
- }
-
- for (case_idx = 0; case_idx < flip->n_cases;)
- {
- unsigned long read_cases = MIN (flip->n_cases - case_idx,
- case_capacity);
- size_t i;
-
- if (read_cases != fread (input_buf, case_bytes, read_cases, input_file))
- {
- if (ferror (input_file))
- msg (SE, _("Error reading %s file: %s."), "FLIP", strerror (errno));
- else
- msg (SE, _("Unexpected end of file reading %s file."), "FLIP");
- return false;
- }
-
- for (i = 0; i < flip->n_vars; i++)
- {
- unsigned long j;
-
- for (j = 0; j < read_cases; j++)
- output_buf[j] = input_buf[i + j * flip->n_vars];
-
- if (fseeko (output_file,
- sizeof *input_buf * (case_idx
- + (off_t) i * flip->n_cases),
- SEEK_SET) != 0)
- {
- msg (SE, _("Error seeking %s source file: %s."), "FLIP",
- strerror (errno));
- return false;
- }
-
- if (fwrite (output_buf, sizeof *output_buf, read_cases, output_file)
- != read_cases)
- {
- msg (SE, _("Error writing %s source file: %s."), "FLIP",
- strerror (errno));
- return false;
- }
- }
-
- case_idx += read_cases;
- }
-
- pool_fclose_temp_file (flip->pool, input_file);
- pool_unregister (flip->pool, input_buf);
- free (input_buf);
-
- if (fseeko (output_file, 0, SEEK_SET) != 0)
- {
- msg (SE, _("Error rewinding %s source file: %s."), "FLIP", strerror (errno));
- return false;
- }
- flip->file = output_file;
-
- return true;
-}
-
-/* Reads and returns one case.
- Returns a null pointer at end of file or if an I/O error occurred. */
-static struct ccase *
-flip_casereader_read (struct casereader *reader, void *flip_)
-{
- struct flip_pgm *flip = flip_;
- struct ccase *c;
- size_t i;
-
- if (flip->error || flip->cases_read >= flip->n_vars)
- return false;
-
- c = case_create (casereader_get_proto (reader));
- data_in (ss_cstr (flip->old_names.names[flip->cases_read]), flip->encoding,
- FMT_A, settings_get_fmt_settings (), case_data_rw_idx (c, 0),
- 8, flip->encoding);
-
- for (i = 0; i < flip->n_cases; i++)
- {
- double in;
- if (fread (&in, sizeof in, 1, flip->file) != 1)
- {
- case_unref (c);
- if (ferror (flip->file))
- msg (SE, _("Error reading %s temporary file: %s."), "FLIP",
- strerror (errno));
- else if (feof (flip->file))
- msg (SE, _("Unexpected end of file reading %s temporary file."), "FLIP");
- else
- NOT_REACHED ();
- flip->error = true;
- return NULL;
- }
- *case_num_rw_idx (c, i + 1) = in;
- }
-
- flip->cases_read++;
-
- return c;
-}
-
-/* Destroys the source.
- Returns true if successful read, false if an I/O occurred
- during destruction or previously. */
-static void
-flip_casereader_destroy (struct casereader *reader, void *flip_)
-{
- struct flip_pgm *flip = flip_;
- if (flip->error)
- casereader_force_error (reader);
- destroy_flip_pgm (flip);
-}
-
-static const struct casereader_class flip_casereader_class =
- {
- flip_casereader_read,
- flip_casereader_destroy,
- NULL,
- NULL,
- };
-\f
-static void
-var_names_init (struct var_names *vn)
-{
- vn->names = NULL;
- vn->n_names = 0;
- vn->allocated_names = 0;
-}
-
-static void
-var_names_add (struct pool *pool, struct var_names *vn, const char *name)
-{
- if (vn->n_names >= vn->allocated_names)
- vn->names = pool_2nrealloc (pool, vn->names, &vn->allocated_names,
- sizeof *vn->names);
- vn->names[vn->n_names++] = name;
-}
-
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