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
27 #include "algorithm.h"
31 #include "dictionary.h"
41 #ifdef HAVE_SYS_TYPES_H
42 #include <sys/types.h>
46 #define _(msgid) gettext (msgid)
48 /* List of variable names. */
52 char name[SHORT_NAME_LEN + 1];
55 /* Represents a FLIP input program. */
58 struct variable **var; /* Variables to transpose. */
59 int *idx_to_fv; /* var[]->index to compacted sink case fv. */
60 size_t var_cnt; /* Number of elements in `var'. */
61 int case_cnt; /* Pre-flip case count. */
62 size_t case_size; /* Post-flip bytes per case. */
64 struct variable *new_names; /* Variable containing new variable names. */
65 struct varname *new_names_head; /* First new variable. */
66 struct varname *new_names_tail; /* Last new variable. */
68 FILE *file; /* Temporary file containing data. */
71 static void destroy_flip_pgm (struct flip_pgm *);
72 static struct case_sink *flip_sink_create (struct flip_pgm *);
73 static struct case_source *flip_source_create (struct flip_pgm *);
74 static void flip_file (struct flip_pgm *);
75 static int build_dictionary (struct flip_pgm *);
77 static const struct case_source_class flip_source_class;
78 static const struct case_sink_class flip_sink_class;
80 /* Parses and executes FLIP. */
84 struct flip_pgm *flip;
88 msg (SM, _("FLIP ignores TEMPORARY. "
89 "Temporary transformations will be made permanent."));
93 flip = xmalloc (sizeof *flip);
95 flip->idx_to_fv = dict_get_compacted_idx_to_fv (default_dict);
98 flip->new_names = NULL;
99 flip->new_names_head = NULL;
100 flip->new_names_tail = NULL;
104 if (lex_match_id ("VARIABLES"))
107 if (!parse_variables (default_dict, &flip->var, &flip->var_cnt, PV_NO_DUPLICATE))
112 dict_get_vars (default_dict, &flip->var, &flip->var_cnt, 1u << DC_SYSTEM);
115 if (lex_match_id ("NEWNAMES"))
118 flip->new_names = parse_variable ();
119 if (!flip->new_names)
123 flip->new_names = dict_lookup_var (default_dict, "CASE_LBL");
129 for (i = 0; i < flip->var_cnt; i++)
130 if (flip->var[i] == flip->new_names)
132 remove_element (flip->var, flip->var_cnt, sizeof *flip->var, i);
138 /* Read the active file into a flip_sink. */
140 temp_trns = temporary = 0;
141 vfm_sink = flip_sink_create (flip);
142 flip->new_names_tail = NULL;
143 procedure (NULL, NULL);
145 /* Flip the data we read. */
148 /* Flip the dictionary. */
149 dict_clear (default_dict);
150 if (!build_dictionary (flip))
152 discard_variables ();
155 flip->case_size = dict_get_case_size (default_dict);
157 /* Set up flipped data for reading. */
158 vfm_source = flip_source_create (flip);
160 return lex_end_of_command ();
163 destroy_flip_pgm (flip);
169 destroy_flip_pgm (struct flip_pgm *flip)
171 struct varname *iter, *next;
174 free (flip->idx_to_fv);
175 for (iter = flip->new_names_head; iter != NULL; iter = next)
180 if (flip->file != NULL)
185 /* Make a new variable with base name NAME, which is bowdlerized and
186 mangled until acceptable, and returns success. */
188 make_new_var (char name[])
192 /* Trim trailing spaces. */
193 cp = strchr (name, '\0');
194 while (cp > name && isspace ((unsigned char) cp[-1]))
197 /* Fix invalid characters. */
198 for (cp = name; *cp && cp < name + SHORT_NAME_LEN; cp++)
201 if (!CHAR_IS_ID1 (*cp) || *cp == '$')
206 if (!CHAR_IS_IDN (*cp))
210 str_uppercase (name);
212 if (dict_create_var (default_dict, name, 0))
215 /* Add numeric extensions until acceptable. */
217 const int len = (int) strlen (name);
218 char n[SHORT_NAME_LEN + 1];
221 for (i = 1; i < 10000000; i++)
223 int ofs = min (7 - intlog10 (i), len);
224 memcpy (n, name, ofs);
225 sprintf (&n[ofs], "%d", i);
227 if (dict_create_var (default_dict, n, 0))
232 msg (SE, _("Could not create acceptable variant for variable %s."), name);
236 /* Make a new dictionary for all the new variable names. */
238 build_dictionary (struct flip_pgm *flip)
240 dict_create_var_assert (default_dict, "CASE_LBL", 8);
242 if (flip->new_names_head == NULL)
246 if (flip->case_cnt > 99999)
248 msg (SE, _("Cannot create more than 99999 variable names."));
252 for (i = 0; i < flip->case_cnt; i++)
255 char s[SHORT_NAME_LEN + 1];
257 sprintf (s, "VAR%03d", i);
258 v = dict_create_var_assert (default_dict, s, 0);
265 for (v = flip->new_names_head; v; v = v->next)
266 if (!make_new_var (v->name))
273 /* Cases during transposition. */
274 struct flip_sink_info
276 struct flip_pgm *flip; /* FLIP program. */
277 union value *output_buf; /* Case output buffer. */
280 /* Creates a flip sink based on FLIP. */
281 static struct case_sink *
282 flip_sink_create (struct flip_pgm *flip)
284 struct flip_sink_info *info = xmalloc (sizeof *info);
288 info->output_buf = xnmalloc (flip->var_cnt, sizeof *info->output_buf);
290 flip->file = tmpfile ();
292 msg (FE, _("Could not create temporary file for FLIP."));
294 /* Write variable names as first case. */
295 for (i = 0; i < flip->var_cnt; i++)
296 buf_copy_str_rpad (info->output_buf[i].s, MAX_SHORT_STRING,
298 if (fwrite (info->output_buf, sizeof *info->output_buf,
299 flip->var_cnt, flip->file) != (size_t) flip->var_cnt)
300 msg (FE, _("Error writing FLIP file: %s."), strerror (errno));
304 return create_case_sink (&flip_sink_class, default_dict, info);
307 /* Writes case C to the FLIP sink. */
309 flip_sink_write (struct case_sink *sink, const struct ccase *c)
311 struct flip_sink_info *info = sink->aux;
312 struct flip_pgm *flip = info->flip;
317 if (flip->new_names != NULL)
319 struct varname *v = xmalloc (sizeof *v);
321 if (flip->new_names->type == NUMERIC)
323 double f = case_num (c, flip->idx_to_fv[flip->new_names->index]);
326 strcpy (v->name, "VSYSMIS");
327 else if (f < INT_MIN)
328 strcpy (v->name, "VNEGINF");
329 else if (f > INT_MAX)
330 strcpy (v->name, "VPOSINF");
333 char name[INT_DIGITS + 2];
334 sprintf (name, "V%d", (int) f);
335 str_copy_trunc (v->name, sizeof v->name, name);
340 int width = min (flip->new_names->width, MAX_SHORT_STRING);
341 memcpy (v->name, case_str (c, flip->idx_to_fv[flip->new_names->index]),
346 if (flip->new_names_head == NULL)
347 flip->new_names_head = v;
349 flip->new_names_tail->next = v;
350 flip->new_names_tail = v;
353 /* Write to external file. */
354 for (i = 0; i < flip->var_cnt; i++)
358 if (flip->var[i]->type == NUMERIC)
359 out = case_num (c, flip->idx_to_fv[flip->var[i]->index]);
362 info->output_buf[i].f = out;
365 if (fwrite (info->output_buf, sizeof *info->output_buf,
366 flip->var_cnt, flip->file) != (size_t) flip->var_cnt)
367 msg (FE, _("Error writing FLIP file: %s."), strerror (errno));
370 /* Transposes the external file into a new file. */
372 flip_file (struct flip_pgm *flip)
375 size_t case_capacity;
377 union value *input_buf, *output_buf;
378 FILE *input_file, *output_file;
380 /* Allocate memory for many cases. */
381 case_bytes = flip->var_cnt * sizeof *input_buf;
382 case_capacity = get_workspace () / case_bytes;
383 if (case_capacity > flip->case_cnt * 2)
384 case_capacity = flip->case_cnt * 2;
385 if (case_capacity < 2)
389 size_t bytes = case_bytes * case_capacity;
390 if (case_capacity > 2)
391 input_buf = malloc (bytes);
393 input_buf = xmalloc (bytes);
394 if (input_buf != NULL)
398 if (case_capacity < 2)
402 /* Use half the allocated memory for input_buf, half for
405 output_buf = input_buf + flip->var_cnt * case_capacity;
407 input_file = flip->file;
408 if (fseek (input_file, 0, SEEK_SET) != 0)
409 msg (FE, _("Error rewinding FLIP file: %s."), strerror (errno));
411 output_file = tmpfile ();
412 if (output_file == NULL)
413 msg (FE, _("Error creating FLIP source file."));
415 for (case_idx = 0; case_idx < flip->case_cnt; )
417 unsigned long read_cases = min (flip->case_cnt - case_idx,
421 if (read_cases != fread (input_buf, case_bytes, read_cases, input_file))
422 msg (FE, _("Error reading FLIP file: %s."), strerror (errno));
424 for (i = 0; i < flip->var_cnt; i++)
428 for (j = 0; j < read_cases; j++)
429 output_buf[j] = input_buf[i + j * flip->var_cnt];
436 #define off_t long int
439 if (fseeko (output_file,
440 sizeof *input_buf * (case_idx
441 + (off_t) i * flip->case_cnt),
443 msg (FE, _("Error seeking FLIP source file: %s."),
446 if (fwrite (output_buf, sizeof *output_buf, read_cases, output_file)
448 msg (FE, _("Error writing FLIP source file: %s."),
452 case_idx += read_cases;
458 if (fseek (output_file, 0, SEEK_SET) != 0)
459 msg (FE, _("Error rewind FLIP source file: %s."), strerror (errno));
460 flip->file = output_file;
463 /* Destroy sink's internal data. */
465 flip_sink_destroy (struct case_sink *sink)
467 struct flip_sink_info *info = sink->aux;
469 free (info->output_buf);
473 /* FLIP sink class. */
474 static const struct case_sink_class flip_sink_class =
483 /* Creates and returns a FLIP source based on PGM,
484 which should have already been used as a sink. */
485 static struct case_source *
486 flip_source_create (struct flip_pgm *pgm)
488 return create_case_source (&flip_source_class, pgm);
491 /* Reads the FLIP stream. Copies each case into C and calls
492 WRITE_CASE passing WC_DATA. */
494 flip_source_read (struct case_source *source,
496 write_case_func *write_case, write_case_data wc_data)
498 struct flip_pgm *flip = source->aux;
499 union value *input_buf;
502 input_buf = xnmalloc (flip->case_cnt, sizeof *input_buf);
503 for (i = 0; i < flip->var_cnt; i++)
507 if (fread (input_buf, sizeof *input_buf, flip->case_cnt,
508 flip->file) != flip->case_cnt)
510 if (ferror (flip->file))
511 msg (SE, _("Error reading FLIP temporary file: %s."),
513 else if (feof (flip->file))
514 msg (SE, _("Unexpected end of file reading FLIP temporary file."));
520 for (j = 0; j < flip->case_cnt; j++)
521 case_data_rw (c, j)->f = input_buf[j].f;
522 if (!write_case (wc_data))
528 /* Destroy internal data in SOURCE. */
530 flip_source_destroy (struct case_source *source)
532 struct flip_pgm *flip = source->aux;
534 destroy_flip_pgm (flip);
537 static const struct case_source_class flip_source_class =