--- /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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