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., 59 Temple Place - Suite 330, Boston, MA
27 #ifdef HAVE_SYS_TYPES_H
28 #include <sys/types.h>
33 #include "dictionary.h"
42 /* List of variable names. */
49 /* Represents a FLIP input program. */
52 struct variable **var; /* Variables to transpose. */
53 int var_cnt; /* Number of elements in `var'. */
54 int case_cnt; /* Pre-flip case count. */
55 size_t case_size; /* Post-flip bytes per case. */
57 struct variable *new_names; /* Variable containing new variable names. */
58 struct varname *new_names_head; /* First new variable. */
59 struct varname *new_names_tail; /* Last new variable. */
61 FILE *file; /* Temporary file containing data. */
64 static void destroy_flip_pgm (struct flip_pgm *);
65 static struct case_sink *flip_sink_create (struct flip_pgm *);
66 static struct case_source *flip_source_create (struct flip_pgm *);
67 static void flip_file (struct flip_pgm *);
68 static int build_dictionary (struct flip_pgm *);
70 static const struct case_source_class flip_source_class;
71 static const struct case_sink_class flip_sink_class;
73 /* Parses and executes FLIP. */
77 struct flip_pgm *flip;
81 msg (SM, _("FLIP ignores TEMPORARY. "
82 "Temporary transformations will be made permanent."));
86 flip = xmalloc (sizeof *flip);
90 flip->new_names = NULL;
91 flip->new_names_head = NULL;
92 flip->new_names_tail = NULL;
96 if (lex_match_id ("VARIABLES"))
99 if (!parse_variables (default_dict, &flip->var, &flip->var_cnt, PV_NO_DUPLICATE))
104 dict_get_vars (default_dict, &flip->var, &flip->var_cnt, 1u << DC_SYSTEM);
107 if (lex_match_id ("NEWNAMES"))
110 flip->new_names = parse_variable ();
111 if (!flip->new_names)
115 flip->new_names = dict_lookup_var (default_dict, "CASE_LBL");
121 for (i = 0; i < flip->var_cnt; i++)
122 if (flip->var[i] == flip->new_names)
124 memmove (&flip->var[i], &flip->var[i + 1], sizeof *flip->var * (flip->var_cnt - i - 1));
130 /* Read the active file into a flip_sink. */
132 temp_trns = temporary = 0;
133 vfm_sink = flip_sink_create (flip);
134 flip->new_names_tail = NULL;
135 procedure (NULL, NULL);
137 /* Flip the data we read. */
140 /* Flip the dictionary. */
141 dict_clear (default_dict);
142 if (!build_dictionary (flip))
144 discard_variables ();
147 flip->case_size = dict_get_case_size (default_dict);
149 /* Set up flipped data for reading. */
150 vfm_source = flip_source_create (flip);
152 return lex_end_of_command ();
155 destroy_flip_pgm (flip);
161 destroy_flip_pgm (struct flip_pgm *flip)
163 struct varname *iter, *next;
166 for (iter = flip->new_names_head; iter != NULL; iter = next)
171 if (flip->file != NULL)
176 /* Make a new variable with base name NAME, which is bowdlerized and
177 mangled until acceptable, and returns success. */
179 make_new_var (char name[])
181 /* Fix invalid characters. */
185 for (cp = name; *cp && !isspace (*cp); cp++)
187 *cp = toupper ((unsigned char) *cp);
188 if (!isalpha (*cp) && *cp != '@' && *cp != '#'
189 && (cp == name || (*cp != '.' && *cp != '$' && *cp != '_'
193 *cp = 'V'; /* _ not valid in first position. */
201 if (dict_create_var (default_dict, name, 0))
204 /* Add numeric extensions until acceptable. */
206 int len = (int) strlen (name);
210 for (i = 1; i < 10000000; i++)
212 int ofs = min (7 - intlog10 (i), len);
213 memcpy (n, name, ofs);
214 sprintf (&n[ofs], "%d", i);
216 if (dict_create_var (default_dict, n, 0))
221 msg (SE, _("Could not create acceptable variant for variable %s."), name);
225 /* Make a new dictionary for all the new variable names. */
227 build_dictionary (struct flip_pgm *flip)
229 dict_create_var_assert (default_dict, "CASE_LBL", 8);
231 if (flip->new_names_head == NULL)
235 if (flip->case_cnt > 99999)
237 msg (SE, _("Cannot create more than 99999 variable names."));
241 for (i = 0; i < flip->case_cnt; i++)
246 sprintf (s, "VAR%03d", i);
247 v = dict_create_var_assert (default_dict, s, 0);
254 for (v = flip->new_names_head; v; v = v->next)
255 if (!make_new_var (v->name))
262 /* Cases during transposition. */
263 struct flip_sink_info
265 struct flip_pgm *flip; /* FLIP program. */
266 union value *output_buf; /* Case output buffer. */
269 /* Creates a flip sink based on FLIP. */
270 static struct case_sink *
271 flip_sink_create (struct flip_pgm *flip)
273 struct flip_sink_info *info = xmalloc (sizeof *info);
277 info->output_buf = xmalloc (sizeof *info->output_buf * flip->var_cnt);
279 flip->file = tmpfile ();
281 msg (FE, _("Could not create temporary file for FLIP."));
283 /* Write variable names as first case. */
284 for (i = 0; i < flip->var_cnt; i++)
285 st_bare_pad_copy (info->output_buf[i].s, flip->var[i]->name, 8);
286 if (fwrite (info->output_buf, sizeof *info->output_buf,
287 flip->var_cnt, flip->file) != (size_t) flip->var_cnt)
288 msg (FE, _("Error writing FLIP file: %s."), strerror (errno));
292 return create_case_sink (&flip_sink_class, default_dict, info);
295 /* Writes case C to the FLIP sink. */
297 flip_sink_write (struct case_sink *sink, const struct ccase *c)
299 struct flip_sink_info *info = sink->aux;
300 struct flip_pgm *flip = info->flip;
305 if (flip->new_names != NULL)
307 struct varname *v = xmalloc (sizeof (struct varname));
309 if (flip->new_names->type == NUMERIC)
311 double f = case_num (c, sink->idx_to_fv[flip->new_names->index]);
314 strcpy (v->name, "VSYSMIS");
315 else if (f < INT_MIN)
316 strcpy (v->name, "VNEGINF");
317 else if (f > INT_MAX)
318 strcpy (v->name, "VPOSINF");
321 char name[INT_DIGITS + 2];
322 sprintf (name, "V%d", (int) f);
323 strncpy (v->name, name, 8);
329 int width = min (flip->new_names->width, 8);
330 memcpy (v->name, case_str (c, sink->idx_to_fv[flip->new_names->index]),
335 if (flip->new_names_head == NULL)
336 flip->new_names_head = v;
338 flip->new_names_tail->next = v;
339 flip->new_names_tail = v;
342 /* Write to external file. */
343 for (i = 0; i < flip->var_cnt; i++)
347 if (flip->var[i]->type == NUMERIC)
348 out = case_num (c, sink->idx_to_fv[flip->var[i]->index]);
351 info->output_buf[i].f = out;
354 if (fwrite (info->output_buf, sizeof *info->output_buf,
355 flip->var_cnt, flip->file) != (size_t) flip->var_cnt)
356 msg (FE, _("Error writing FLIP file: %s."), strerror (errno));
359 /* Transposes the external file into a new file. */
361 flip_file (struct flip_pgm *flip)
364 size_t case_capacity;
366 union value *input_buf, *output_buf;
367 FILE *input_file, *output_file;
369 /* Allocate memory for many cases. */
370 case_bytes = flip->var_cnt * sizeof *input_buf;
371 case_capacity = get_max_workspace() / case_bytes;
372 if (case_capacity > flip->case_cnt * 2)
373 case_capacity = flip->case_cnt * 2;
374 if (case_capacity < 2)
378 size_t bytes = case_bytes * case_capacity;
379 if (case_capacity > 2)
380 input_buf = malloc (bytes);
382 input_buf = xmalloc (bytes);
383 if (input_buf != NULL)
387 if (case_capacity < 2)
391 /* Use half the allocated memory for input_buf, half for
394 output_buf = input_buf + flip->var_cnt * case_capacity;
396 input_file = flip->file;
397 if (fseek (input_file, 0, SEEK_SET) != 0)
398 msg (FE, _("Error rewinding FLIP file: %s."), strerror (errno));
400 output_file = tmpfile ();
401 if (output_file == NULL)
402 msg (FE, _("Error creating FLIP source file."));
404 for (case_idx = 0; case_idx < flip->case_cnt; )
406 unsigned long read_cases = min (flip->case_cnt - case_idx,
410 if (read_cases != fread (input_buf, case_bytes, read_cases, input_file))
411 msg (FE, _("Error reading FLIP file: %s."), strerror (errno));
413 for (i = 0; i < flip->var_cnt; i++)
417 for (j = 0; j < read_cases; j++)
418 output_buf[j] = input_buf[i + j * flip->var_cnt];
425 #define off_t long int
428 if (fseeko (output_file,
429 sizeof *input_buf * (case_idx
430 + (off_t) i * flip->case_cnt),
432 msg (FE, _("Error seeking FLIP source file: %s."),
435 if (fwrite (output_buf, sizeof *output_buf, read_cases, output_file)
437 msg (FE, _("Error writing FLIP source file: %s."),
441 case_idx += read_cases;
447 if (fseek (output_file, 0, SEEK_SET) != 0)
448 msg (FE, _("Error rewind FLIP source file: %s."), strerror (errno));
449 flip->file = output_file;
452 /* Destroy sink's internal data. */
454 flip_sink_destroy (struct case_sink *sink)
456 struct flip_sink_info *info = sink->aux;
458 free (info->output_buf);
462 /* FLIP sink class. */
463 static const struct case_sink_class flip_sink_class =
472 /* Creates and returns a FLIP source based on PGM,
473 which should have already been used as a sink. */
474 static struct case_source *
475 flip_source_create (struct flip_pgm *pgm)
477 return create_case_source (&flip_source_class, default_dict, pgm);
480 /* Reads the FLIP stream. Copies each case into C and calls
481 WRITE_CASE passing WC_DATA. */
483 flip_source_read (struct case_source *source,
485 write_case_func *write_case, write_case_data wc_data)
487 struct flip_pgm *flip = source->aux;
488 union value *input_buf;
491 input_buf = xmalloc (sizeof *input_buf * flip->case_cnt);
492 for (i = 0; i < flip->var_cnt; i++)
496 if (fread (input_buf, sizeof *input_buf, flip->case_cnt,
497 flip->file) != flip->case_cnt)
499 if (ferror (flip->file))
500 msg (SE, _("Error reading FLIP temporary file: %s."),
502 else if (feof (flip->file))
503 msg (SE, _("Unexpected end of file reading FLIP temporary file."));
509 for (j = 0; j < flip->case_cnt; j++)
510 case_data_rw (c, j)->f = input_buf[j].f;
511 if (!write_case (wc_data))
517 /* Destroy internal data in SOURCE. */
519 flip_source_destroy (struct case_source *source)
521 struct flip_pgm *flip = source->aux;
523 destroy_flip_pgm (flip);
526 static const struct case_source_class flip_source_class =