1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 1997-9, 2000, 2006, 2007 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU 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, see <http://www.gnu.org/licenses/>. */
19 #include "sys-file-writer.h"
20 #include "sys-file-private.h"
29 #include <libpspp/alloc.h>
30 #include <libpspp/float-format.h>
31 #include <libpspp/integer-format.h>
32 #include <libpspp/magic.h>
33 #include <libpspp/message.h>
34 #include <libpspp/misc.h>
35 #include <libpspp/str.h>
36 #include <libpspp/version.h>
38 #include <data/case.h>
39 #include <data/casewriter-provider.h>
40 #include <data/casewriter.h>
41 #include <data/dictionary.h>
42 #include <data/file-handle-def.h>
43 #include <data/file-name.h>
44 #include <data/format.h>
45 #include <data/missing-values.h>
46 #include <data/settings.h>
47 #include <data/short-names.h>
48 #include <data/value-labels.h>
49 #include <data/variable.h>
52 #include "unlocked-io.h"
55 #define _(msgid) gettext (msgid)
57 /* Compression bias used by PSPP. Values between (1 -
58 COMPRESSION_BIAS) and (251 - COMPRESSION_BIAS) inclusive can be
60 #define COMPRESSION_BIAS 100
62 /* System file writer. */
65 struct file_handle *fh; /* File handle. */
66 FILE *file; /* File stream. */
68 bool compress; /* 1=compressed, 0=not compressed. */
69 casenumber case_cnt; /* Number of cases written so far. */
71 /* Compression buffering.
73 Compressed data is output as groups of 8 1-byte opcodes
74 followed by up to 8 (depending on the opcodes) 8-byte data
75 items. Data items and opcodes arrive at the same time but
76 must be reordered for writing to disk, thus a small amount
78 uint8_t opcodes[8]; /* Buffered opcodes. */
79 int opcode_cnt; /* Number of buffered opcodes. */
80 uint8_t data[8][8]; /* Buffered data. */
81 int data_cnt; /* Number of buffered data items. */
84 struct sfm_var *sfm_vars; /* Variables. */
85 size_t sfm_var_cnt; /* Number of variables. */
86 size_t segment_cnt; /* Number of variables including extra segments
87 for long string variables. */
90 static struct casewriter_class sys_file_casewriter_class;
92 static void write_header (struct sfm_writer *, const struct dictionary *);
93 static void write_variable (struct sfm_writer *, const struct variable *);
94 static void write_value_labels (struct sfm_writer *,
95 struct variable *, int idx);
96 static void write_integer_info_record (struct sfm_writer *);
97 static void write_float_info_record (struct sfm_writer *);
99 static void write_longvar_table (struct sfm_writer *w,
100 const struct dictionary *dict);
102 static void write_vls_length_table (struct sfm_writer *w,
103 const struct dictionary *dict);
106 static void write_variable_display_parameters (struct sfm_writer *w,
107 const struct dictionary *dict);
109 static void write_documents (struct sfm_writer *, const struct dictionary *);
111 static void write_int (struct sfm_writer *, int32_t);
112 static inline void convert_double_to_output_format (double, uint8_t[8]);
113 static void write_float (struct sfm_writer *, double);
114 static void write_string (struct sfm_writer *, const char *, size_t);
115 static void write_bytes (struct sfm_writer *, const void *, size_t);
116 static void write_zeros (struct sfm_writer *, size_t);
117 static void write_spaces (struct sfm_writer *, size_t);
118 static void write_value (struct sfm_writer *, const union value *, int width);
120 static void write_case_uncompressed (struct sfm_writer *, struct ccase *);
121 static void write_case_compressed (struct sfm_writer *, struct ccase *);
122 static void flush_compressed (struct sfm_writer *);
123 static void put_cmp_opcode (struct sfm_writer *, uint8_t);
124 static void put_cmp_number (struct sfm_writer *, double);
125 static void put_cmp_string (struct sfm_writer *, const void *, size_t);
127 bool write_error (const struct sfm_writer *);
128 bool close_writer (struct sfm_writer *);
130 /* Returns default options for writing a system file. */
131 struct sfm_write_options
132 sfm_writer_default_options (void)
134 struct sfm_write_options opts;
135 opts.create_writeable = true;
136 opts.compress = get_scompression ();
141 /* Opens the system file designated by file handle FH for writing
142 cases from dictionary D according to the given OPTS. If
143 COMPRESS is nonzero, the system file will be compressed.
145 No reference to D is retained, so it may be modified or
146 destroyed at will after this function returns. D is not
147 modified by this function, except to assign short names. */
149 sfm_open_writer (struct file_handle *fh, struct dictionary *d,
150 struct sfm_write_options opts)
152 struct sfm_writer *w = NULL;
159 if (opts.version != 2 && opts.version != 3)
161 msg (ME, _("Unknown system file version %d. Treating as version %d."),
166 /* Open file handle as an exclusive writer. */
167 if (!fh_open (fh, FH_REF_FILE, "system file", "we"))
170 /* Create the file on disk. */
171 mode = S_IRUSR | S_IRGRP | S_IROTH;
172 if (opts.create_writeable)
173 mode |= S_IWUSR | S_IWGRP | S_IWOTH;
174 file = create_stream (fh_get_file_name (fh), "w", mode);
177 msg (ME, _("Error opening \"%s\" for writing as a system file: %s."),
178 fh_get_file_name (fh), strerror (errno));
179 fh_close (fh, "system file", "we");
183 /* Create and initialize writer. */
184 w = xmalloc (sizeof *w);
188 w->compress = opts.compress;
191 w->opcode_cnt = w->data_cnt = 0;
193 /* Figure out how to map in-memory case data to on-disk case
194 data. Also count the number of segments. Very long strings
195 occupy multiple segments, otherwise each variable only takes
197 w->segment_cnt = sfm_dictionary_to_sfm_vars (d, &w->sfm_vars,
200 /* Write the file header. */
203 /* Write basic variable info. */
204 short_names_assign (d);
205 for (i = 0; i < dict_get_var_cnt (d); i++)
206 write_variable (w, dict_get_var (d, i));
208 /* Write out value labels. */
210 for (i = 0; i < dict_get_var_cnt (d); i++)
212 struct variable *v = dict_get_var (d, i);
214 write_value_labels (w, v, idx);
215 idx += sfm_width_to_octs (var_get_width (v));
218 if (dict_get_documents (d) != NULL)
219 write_documents (w, d);
221 write_integer_info_record (w);
222 write_float_info_record (w);
224 write_variable_display_parameters (w, d);
226 if (opts.version >= 3)
227 write_longvar_table (w, d);
229 write_vls_length_table (w, d);
231 /* Write end-of-headers record. */
241 return casewriter_create (dict_get_next_value_idx (d),
242 &sys_file_casewriter_class, w);
245 /* Returns value of X truncated to two least-significant digits. */
256 /* Calculates the offset of data for TARGET_VAR from the
257 beginning of each case's data for dictionary D. The return
258 value is in "octs" (8-byte units). */
260 calc_oct_idx (const struct dictionary *d, struct variable *target_var)
266 for (i = 0; i < dict_get_var_cnt (d); i++)
268 struct variable *var = dict_get_var (d, i);
269 if (var == target_var)
271 oct_idx += sfm_width_to_octs (var_get_width (var));
276 /* Write the sysfile_header header to system file W. */
278 write_header (struct sfm_writer *w, const struct dictionary *d)
281 char creation_date[10];
282 char creation_time[9];
283 const char *file_label;
284 struct variable *weight;
288 /* Record-type code. */
289 write_string (w, "$FL2", 4);
291 /* Product identification. */
292 snprintf (prod_name, sizeof prod_name, "@(#) SPSS DATA FILE %s - %s",
293 version, host_system);
294 write_string (w, prod_name, 60);
299 /* Number of `union value's per case. */
300 write_int (w, calc_oct_idx (d, NULL));
303 write_int (w, w->compress);
305 /* Weight variable. */
306 weight = dict_get_weight (d);
307 write_int (w, weight != NULL ? calc_oct_idx (d, weight) + 1 : 0);
309 /* Number of cases. We don't know this in advance, so we write
310 -1 to indicate an unknown number of cases. Later we can
311 come back and overwrite it with the true value. */
314 /* Compression bias. */
315 write_float (w, COMPRESSION_BIAS);
317 /* Creation date and time. */
318 if (time (&t) == (time_t) -1)
320 strcpy (creation_date, "01 Jan 70");
321 strcpy (creation_time, "00:00:00");
325 static const char *month_name[12] =
327 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
328 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
330 struct tm *tmp = localtime (&t);
331 int day = rerange (tmp->tm_mday);
332 int mon = rerange (tmp->tm_mon + 1);
333 int year = rerange (tmp->tm_year);
334 int hour = rerange (tmp->tm_hour + 1);
335 int min = rerange (tmp->tm_min + 1);
336 int sec = rerange (tmp->tm_sec + 1);
338 snprintf (creation_date, sizeof creation_date,
339 "%02d %s %02d", day, month_name[mon - 1], year);
340 snprintf (creation_time, sizeof creation_time,
341 "%02d:%02d:%02d", hour - 1, min - 1, sec - 1);
343 write_string (w, creation_date, 9);
344 write_string (w, creation_time, 8);
347 file_label = dict_get_label (d);
348 if (file_label == NULL)
350 write_string (w, file_label, 64);
356 /* Write format spec FMT to W, after adjusting it to be
357 compatible with the given WIDTH. */
359 write_format (struct sfm_writer *w, struct fmt_spec fmt, int width)
361 assert (fmt_check_output (&fmt));
362 assert (sfm_width_to_segments (width) == 1);
365 fmt_resize (&fmt, width);
366 write_int (w, (fmt_to_io (fmt.type) << 16) | (fmt.w << 8) | fmt.d);
369 /* Write a string continuation variable record for each 8-byte
370 section beyond the initial 8 bytes, for a variable of the
373 write_variable_continuation_records (struct sfm_writer *w, int width)
377 assert (sfm_width_to_segments (width) == 1);
378 for (position = 8; position < width; position += 8)
380 write_int (w, 2); /* Record type. */
381 write_int (w, -1); /* Width. */
382 write_int (w, 0); /* No variable label. */
383 write_int (w, 0); /* No missing values. */
384 write_int (w, 0); /* Print format. */
385 write_int (w, 0); /* Write format. */
386 write_zeros (w, 8); /* Name. */
390 /* Write the variable record(s) for variable V to system file
393 write_variable (struct sfm_writer *w, const struct variable *v)
395 int width = var_get_width (v);
396 int segment_cnt = sfm_width_to_segments (width);
397 int seg0_width = sfm_segment_alloc_width (width, 0);
398 const struct missing_values *mv = var_get_missing_values (v);
405 write_int (w, seg0_width);
407 /* Variable has a variable label? */
408 write_int (w, var_has_label (v));
410 /* Number of missing values. If there is a range, then the
411 range counts as 2 missing values and causes the number to be
413 write_int (w, mv_has_range (mv) ? 2 - mv_n_values (mv) : mv_n_values (mv));
415 /* Print and write formats. */
416 write_format (w, *var_get_print_format (v), seg0_width);
417 write_format (w, *var_get_write_format (v), seg0_width);
420 The full name is in a translation table written
422 write_string (w, var_get_short_name (v, 0), 8);
425 if (var_has_label (v))
427 const char *label = var_get_label (v);
428 size_t padded_len = ROUND_UP (MIN (strlen (label), 255), 4);
429 write_int (w, padded_len);
430 write_string (w, label, padded_len);
433 /* Write the missing values, if any, range first. */
434 if (mv_has_range (mv))
437 mv_peek_range (mv, &x, &y);
441 for (i = 0; i < mv_n_values (mv); i++)
444 mv_peek_value (mv, &value, i);
445 write_value (w, &value, seg0_width);
448 write_variable_continuation_records (w, seg0_width);
450 /* Write additional segments for very long string variables. */
451 for (i = 1; i < segment_cnt; i++)
453 int seg_width = sfm_segment_alloc_width (width, i);
454 struct fmt_spec fmt = fmt_for_output (FMT_A, MAX (seg_width, 1), 0);
456 write_int (w, 2); /* Variable record. */
457 write_int (w, seg_width); /* Width. */
458 write_int (w, 0); /* No variable label. */
459 write_int (w, 0); /* No missing values. */
460 write_format (w, fmt, seg_width); /* Print format. */
461 write_format (w, fmt, seg_width); /* Write format. */
462 write_string (w, var_get_short_name (v, i), 8);
464 write_variable_continuation_records (w, seg_width);
468 /* Writes the value labels for variable V having system file
469 variable index IDX to system file W. */
471 write_value_labels (struct sfm_writer *w, struct variable *v, int idx)
473 const struct val_labs *val_labs;
474 struct val_labs_iterator *i;
477 val_labs = var_get_value_labels (v);
478 if (val_labs == NULL)
481 /* Value label record. */
482 write_int (w, 3); /* Record type. */
483 write_int (w, val_labs_count (val_labs));
484 for (vl = val_labs_first_sorted (val_labs, &i); vl != NULL;
485 vl = val_labs_next (val_labs, &i))
487 uint8_t len = MIN (strlen (vl->label), 255);
489 write_value (w, &vl->value, var_get_width (v));
490 write_bytes (w, &len, 1);
491 write_bytes (w, vl->label, len);
492 write_zeros (w, REM_RND_UP (len + 1, 8));
495 /* Value label variable record. */
496 write_int (w, 4); /* Record type. */
497 write_int (w, 1); /* Number of variables. */
498 write_int (w, idx + 1); /* Variable's dictionary index. */
501 /* Writes record type 6, document record. */
503 write_documents (struct sfm_writer *w, const struct dictionary *d)
505 size_t line_cnt = dict_get_document_line_cnt (d);
507 write_int (w, 6); /* Record type. */
508 write_int (w, line_cnt);
509 write_bytes (w, dict_get_documents (d), line_cnt * DOC_LINE_LENGTH);
512 /* Write the alignment, width and scale values. */
514 write_variable_display_parameters (struct sfm_writer *w,
515 const struct dictionary *dict)
519 write_int (w, 7); /* Record type. */
520 write_int (w, 11); /* Record subtype. */
521 write_int (w, 4); /* Data item (int32) size. */
522 write_int (w, w->segment_cnt * 3); /* Number of data items. */
524 for (i = 0; i < dict_get_var_cnt (dict); ++i)
526 struct variable *v = dict_get_var (dict, i);
527 int width = var_get_width (v);
528 int segment_cnt = sfm_width_to_segments (width);
529 int measure = (var_get_measure (v) == MEASURE_NOMINAL ? 1
530 : var_get_measure (v) == MEASURE_ORDINAL ? 2
532 int alignment = (var_get_alignment (v) == ALIGN_LEFT ? 0
533 : var_get_alignment (v) == ALIGN_RIGHT ? 1
537 for (i = 0; i < segment_cnt; i++)
539 int width_left = width - sfm_segment_effective_offset (width, i);
540 write_int (w, measure);
541 write_int (w, (i == 0 ? var_get_display_width (v)
542 : var_default_display_width (width_left)));
543 write_int (w, alignment);
548 /* Writes the table of lengths for very long string variables. */
550 write_vls_length_table (struct sfm_writer *w,
551 const struct dictionary *dict)
556 ds_init_empty (&map);
557 for (i = 0; i < dict_get_var_cnt (dict); ++i)
559 const struct variable *v = dict_get_var (dict, i);
560 if (sfm_width_to_segments (var_get_width (v)) > 1)
561 ds_put_format (&map, "%s=%05d%c\t",
562 var_get_short_name (v, 0), var_get_width (v), 0);
564 if (!ds_is_empty (&map))
566 write_int (w, 7); /* Record type. */
567 write_int (w, 14); /* Record subtype. */
568 write_int (w, 1); /* Data item (char) size. */
569 write_int (w, ds_length (&map)); /* Number of data items. */
570 write_bytes (w, ds_data (&map), ds_length (&map));
575 /* Writes the long variable name table. */
577 write_longvar_table (struct sfm_writer *w, const struct dictionary *dict)
582 ds_init_empty (&map);
583 for (i = 0; i < dict_get_var_cnt (dict); i++)
585 struct variable *v = dict_get_var (dict, i);
588 ds_put_char (&map, '\t');
589 ds_put_format (&map, "%s=%s",
590 var_get_short_name (v, 0), var_get_name (v));
593 write_int (w, 7); /* Record type. */
594 write_int (w, 13); /* Record subtype. */
595 write_int (w, 1); /* Data item (char) size. */
596 write_int (w, ds_length (&map)); /* Number of data items. */
597 write_bytes (w, ds_data (&map), ds_length (&map));
602 /* Write integer information record. */
604 write_integer_info_record (struct sfm_writer *w)
606 int version_component[3];
609 /* Parse the version string. */
610 memset (version_component, 0, sizeof version_component);
611 sscanf (bare_version, "%d.%d.%d",
612 &version_component[0], &version_component[1], &version_component[2]);
614 /* Figure out the floating-point format. */
615 if (FLOAT_NATIVE_64_BIT == FLOAT_IEEE_DOUBLE_LE
616 || FLOAT_NATIVE_64_BIT == FLOAT_IEEE_DOUBLE_BE)
618 else if (FLOAT_NATIVE_64_BIT == FLOAT_Z_LONG)
620 else if (FLOAT_NATIVE_64_BIT == FLOAT_VAX_D)
626 write_int (w, 7); /* Record type. */
627 write_int (w, 3); /* Record subtype. */
628 write_int (w, 4); /* Data item (int32) size. */
629 write_int (w, 8); /* Number of data items. */
630 write_int (w, version_component[0]);
631 write_int (w, version_component[1]);
632 write_int (w, version_component[2]);
633 write_int (w, -1); /* Machine code. */
634 write_int (w, float_format);
635 write_int (w, 1); /* Compression code. */
636 write_int (w, INTEGER_NATIVE == INTEGER_MSB_FIRST ? 1 : 2);
637 write_int (w, 2); /* 7-bit ASCII. */
640 /* Write floating-point information record. */
642 write_float_info_record (struct sfm_writer *w)
644 write_int (w, 7); /* Record type. */
645 write_int (w, 4); /* Record subtype. */
646 write_int (w, 8); /* Data item (flt64) size. */
647 write_int (w, 3); /* Number of data items. */
648 write_float (w, SYSMIS); /* System-missing value. */
649 write_float (w, HIGHEST); /* Value used for HIGHEST in missing values. */
650 write_float (w, LOWEST); /* Value used for LOWEST in missing values. */
653 /* Writes case C to system file W. */
655 sys_file_casewriter_write (struct casewriter *writer, void *w_,
658 struct sfm_writer *w = w_;
660 if (ferror (w->file))
662 casewriter_force_error (writer);
670 write_case_uncompressed (w, c);
672 write_case_compressed (w, c);
677 /* Destroys system file writer W. */
679 sys_file_casewriter_destroy (struct casewriter *writer, void *w_)
681 struct sfm_writer *w = w_;
682 if (!close_writer (w))
683 casewriter_force_error (writer);
686 /* Returns true if an I/O error has occurred on WRITER, false otherwise. */
688 write_error (const struct sfm_writer *writer)
690 return ferror (writer->file);
693 /* Closes a system file after we're done with it.
694 Returns true if successful, false if an I/O error occurred. */
696 close_writer (struct sfm_writer *w)
707 if (w->opcode_cnt > 0)
708 flush_compressed (w);
711 ok = !write_error (w);
713 /* Seek back to the beginning and update the number of cases.
714 This is just a courtesy to later readers, so there's no need
715 to check return values or report errors. */
716 if (ok && w->case_cnt <= INT32_MAX && !fseek (w->file, 80, SEEK_SET))
718 write_int (w, w->case_cnt);
722 if (fclose (w->file) == EOF)
726 msg (ME, _("An I/O error occurred writing system file \"%s\"."),
727 fh_get_file_name (w->fh));
730 fh_close (w->fh, "system file", "we");
738 /* System file writer casewriter class. */
739 static struct casewriter_class sys_file_casewriter_class =
741 sys_file_casewriter_write,
742 sys_file_casewriter_destroy,
746 /* Writes case C to system file W, without compressing it. */
748 write_case_uncompressed (struct sfm_writer *w, struct ccase *c)
752 for (i = 0; i < w->sfm_var_cnt; i++)
754 struct sfm_var *v = &w->sfm_vars[i];
757 write_float (w, case_num_idx (c, v->case_index));
760 write_bytes (w, case_str_idx (c, v->case_index) + v->offset,
762 write_spaces (w, v->padding);
767 /* Writes case C to system file W, with compression. */
769 write_case_compressed (struct sfm_writer *w, struct ccase *c)
773 for (i = 0; i < w->sfm_var_cnt; i++)
775 struct sfm_var *v = &w->sfm_vars[i];
779 double d = case_num_idx (c, v->case_index);
781 put_cmp_opcode (w, 255);
782 else if (d >= 1 - COMPRESSION_BIAS
783 && d <= 251 - COMPRESSION_BIAS
785 put_cmp_opcode (w, (int) d + COMPRESSION_BIAS);
788 put_cmp_opcode (w, 253);
789 put_cmp_number (w, d);
794 int offset = v->offset;
797 /* This code properly deals with a width that is not a
798 multiple of 8, by ensuring that the final partial
799 oct (8 byte unit) is treated as padded with spaces
801 for (width = v->width; width > 0; width -= 8, offset += 8)
803 const void *data = case_str_idx (c, v->case_index) + offset;
804 int chunk_size = MIN (width, 8);
805 if (!memcmp (data, " ", chunk_size))
806 put_cmp_opcode (w, 254);
809 put_cmp_opcode (w, 253);
810 put_cmp_string (w, data, chunk_size);
814 /* This code deals properly with padding that is not a
815 multiple of 8 bytes, by discarding the remainder,
816 which was already effectively padded with spaces in
817 the previous loop. (Note that v->width + v->padding
818 is always a multiple of 8.) */
819 for (padding = v->padding / 8; padding > 0; padding--)
820 put_cmp_opcode (w, 254);
825 /* Flushes buffered compressed opcodes and data to W.
826 The compression buffer must not be empty. */
828 flush_compressed (struct sfm_writer *w)
830 assert (w->opcode_cnt > 0 && w->opcode_cnt <= 8);
832 write_bytes (w, w->opcodes, w->opcode_cnt);
833 write_zeros (w, 8 - w->opcode_cnt);
835 write_bytes (w, w->data, w->data_cnt * sizeof *w->data);
837 w->opcode_cnt = w->data_cnt = 0;
840 /* Appends OPCODE to the buffered set of compression opcodes in
841 W. Flushes the compression buffer beforehand if necessary. */
843 put_cmp_opcode (struct sfm_writer *w, uint8_t opcode)
845 if (w->opcode_cnt >= 8)
846 flush_compressed (w);
848 w->opcodes[w->opcode_cnt++] = opcode;
851 /* Appends NUMBER to the buffered compression data in W. The
852 buffer must not be full; the way to assure that is to call
853 this function only just after a call to put_cmp_opcode, which
854 will flush the buffer as necessary. */
856 put_cmp_number (struct sfm_writer *w, double number)
858 assert (w->opcode_cnt > 0);
859 assert (w->data_cnt < 8);
861 convert_double_to_output_format (number, w->data[w->data_cnt++]);
864 /* Appends SIZE bytes of DATA to the buffered compression data in
865 W, followed by enough spaces to pad the output data to exactly
866 8 bytes (thus, SIZE must be no greater than 8). The buffer
867 must not be full; the way to assure that is to call this
868 function only just after a call to put_cmp_opcode, which will
869 flush the buffer as necessary. */
871 put_cmp_string (struct sfm_writer *w, const void *data, size_t size)
873 assert (w->opcode_cnt > 0);
874 assert (w->data_cnt < 8);
877 memset (w->data[w->data_cnt], ' ', 8);
878 memcpy (w->data[w->data_cnt], data, size);
882 /* Writes 32-bit integer X to the output file for writer W. */
884 write_int (struct sfm_writer *w, int32_t x)
886 write_bytes (w, &x, sizeof x);
889 /* Converts NATIVE to the 64-bit format used in output files in
892 convert_double_to_output_format (double native, uint8_t output[8])
894 /* If "double" is not a 64-bit type, then convert it to a
895 64-bit type. Otherwise just copy it. */
896 if (FLOAT_NATIVE_DOUBLE != FLOAT_NATIVE_64_BIT)
897 float_convert (FLOAT_NATIVE_DOUBLE, &native, FLOAT_NATIVE_64_BIT, output);
899 memcpy (output, &native, sizeof native);
902 /* Writes floating-point number X to the output file for writer
905 write_float (struct sfm_writer *w, double x)
908 convert_double_to_output_format (x, output);
909 write_bytes (w, output, sizeof output);
912 /* Writes contents of VALUE with the given WIDTH to W, padding
913 with zeros to a multiple of 8 bytes.
914 To avoid a branch, and because we don't actually need to
915 support it, WIDTH must be no bigger than 8. */
917 write_value (struct sfm_writer *w, const union value *value, int width)
921 write_float (w, value->f);
924 write_bytes (w, value->s, width);
925 write_zeros (w, 8 - width);
929 /* Writes null-terminated STRING in a field of the given WIDTH to
930 W. If WIDTH is longer than WIDTH, it is truncated; if WIDTH
931 is narrowed, it is padded on the right with spaces. */
933 write_string (struct sfm_writer *w, const char *string, size_t width)
935 size_t data_bytes = MIN (strlen (string), width);
936 size_t pad_bytes = width - data_bytes;
937 write_bytes (w, string, data_bytes);
938 while (pad_bytes-- > 0)
942 /* Writes SIZE bytes of DATA to W's output file. */
944 write_bytes (struct sfm_writer *w, const void *data, size_t size)
946 fwrite (data, 1, size, w->file);
949 /* Writes N zeros to W's output file. */
951 write_zeros (struct sfm_writer *w, size_t n)
957 /* Writes N spaces to W's output file. */
959 write_spaces (struct sfm_writer *w, size_t n)