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/float-format.h>
30 #include <libpspp/integer-format.h>
31 #include <libpspp/message.h>
32 #include <libpspp/misc.h>
33 #include <libpspp/str.h>
34 #include <libpspp/version.h>
36 #include <data/case.h>
37 #include <data/casewriter-provider.h>
38 #include <data/casewriter.h>
39 #include <data/dictionary.h>
40 #include <data/file-handle-def.h>
41 #include <data/file-name.h>
42 #include <data/format.h>
43 #include <data/missing-values.h>
44 #include <data/settings.h>
45 #include <data/short-names.h>
46 #include <data/value-labels.h>
47 #include <data/variable.h>
50 #include "unlocked-io.h"
54 #define _(msgid) gettext (msgid)
56 /* Compression bias used by PSPP. Values between (1 -
57 COMPRESSION_BIAS) and (251 - COMPRESSION_BIAS) inclusive can be
59 #define COMPRESSION_BIAS 100
61 /* System file writer. */
64 struct file_handle *fh; /* File handle. */
65 FILE *file; /* File stream. */
67 bool compress; /* 1=compressed, 0=not compressed. */
68 casenumber case_cnt; /* Number of cases written so far. */
70 /* Compression buffering.
72 Compressed data is output as groups of 8 1-byte opcodes
73 followed by up to 8 (depending on the opcodes) 8-byte data
74 items. Data items and opcodes arrive at the same time but
75 must be reordered for writing to disk, thus a small amount
77 uint8_t opcodes[8]; /* Buffered opcodes. */
78 int opcode_cnt; /* Number of buffered opcodes. */
79 uint8_t data[8][8]; /* Buffered data. */
80 int data_cnt; /* Number of buffered data items. */
83 struct sfm_var *sfm_vars; /* Variables. */
84 size_t sfm_var_cnt; /* Number of variables. */
85 size_t segment_cnt; /* Number of variables including extra segments
86 for long string variables. */
89 static struct casewriter_class sys_file_casewriter_class;
91 static void write_header (struct sfm_writer *, const struct dictionary *);
92 static void write_variable (struct sfm_writer *, const struct variable *);
93 static void write_value_labels (struct sfm_writer *,
94 struct variable *, int idx);
95 static void write_integer_info_record (struct sfm_writer *);
96 static void write_float_info_record (struct sfm_writer *);
98 static void write_longvar_table (struct sfm_writer *w,
99 const struct dictionary *dict);
101 static void write_vls_length_table (struct sfm_writer *w,
102 const struct dictionary *dict);
105 static void write_variable_display_parameters (struct sfm_writer *w,
106 const struct dictionary *dict);
108 static void write_documents (struct sfm_writer *, const struct dictionary *);
110 static void write_int (struct sfm_writer *, int32_t);
111 static inline void convert_double_to_output_format (double, uint8_t[8]);
112 static void write_float (struct sfm_writer *, double);
113 static void write_string (struct sfm_writer *, const char *, size_t);
114 static void write_bytes (struct sfm_writer *, const void *, size_t);
115 static void write_zeros (struct sfm_writer *, size_t);
116 static void write_spaces (struct sfm_writer *, size_t);
117 static void write_value (struct sfm_writer *, const union value *, int width);
119 static void write_case_uncompressed (struct sfm_writer *, struct ccase *);
120 static void write_case_compressed (struct sfm_writer *, struct ccase *);
121 static void flush_compressed (struct sfm_writer *);
122 static void put_cmp_opcode (struct sfm_writer *, uint8_t);
123 static void put_cmp_number (struct sfm_writer *, double);
124 static void put_cmp_string (struct sfm_writer *, const void *, size_t);
126 bool write_error (const struct sfm_writer *);
127 bool close_writer (struct sfm_writer *);
129 /* Returns default options for writing a system file. */
130 struct sfm_write_options
131 sfm_writer_default_options (void)
133 struct sfm_write_options opts;
134 opts.create_writeable = true;
135 opts.compress = get_scompression ();
140 /* Opens the system file designated by file handle FH for writing
141 cases from dictionary D according to the given OPTS. If
142 COMPRESS is nonzero, the system file will be compressed.
144 No reference to D is retained, so it may be modified or
145 destroyed at will after this function returns. D is not
146 modified by this function, except to assign short names. */
148 sfm_open_writer (struct file_handle *fh, struct dictionary *d,
149 struct sfm_write_options opts)
151 struct sfm_writer *w = NULL;
158 if (opts.version != 2 && opts.version != 3)
160 msg (ME, _("Unknown system file version %d. Treating as version %d."),
165 /* Open file handle as an exclusive writer. */
166 if (!fh_open (fh, FH_REF_FILE, "system file", "we"))
169 /* Create the file on disk. */
170 mode = S_IRUSR | S_IRGRP | S_IROTH;
171 if (opts.create_writeable)
172 mode |= S_IWUSR | S_IWGRP | S_IWOTH;
173 file = create_stream (fh_get_file_name (fh), "w", mode);
176 msg (ME, _("Error opening \"%s\" for writing as a system file: %s."),
177 fh_get_file_name (fh), strerror (errno));
178 fh_close (fh, "system file", "we");
182 /* Create and initialize writer. */
183 w = xmalloc (sizeof *w);
187 w->compress = opts.compress;
190 w->opcode_cnt = w->data_cnt = 0;
192 /* Figure out how to map in-memory case data to on-disk case
193 data. Also count the number of segments. Very long strings
194 occupy multiple segments, otherwise each variable only takes
196 w->segment_cnt = sfm_dictionary_to_sfm_vars (d, &w->sfm_vars,
199 /* Write the file header. */
202 /* Write basic variable info. */
203 short_names_assign (d);
204 for (i = 0; i < dict_get_var_cnt (d); i++)
205 write_variable (w, dict_get_var (d, i));
207 /* Write out value labels. */
209 for (i = 0; i < dict_get_var_cnt (d); i++)
211 struct variable *v = dict_get_var (d, i);
213 write_value_labels (w, v, idx);
214 idx += sfm_width_to_octs (var_get_width (v));
217 if (dict_get_documents (d) != NULL)
218 write_documents (w, d);
220 write_integer_info_record (w);
221 write_float_info_record (w);
223 write_variable_display_parameters (w, d);
225 if (opts.version >= 3)
226 write_longvar_table (w, d);
228 write_vls_length_table (w, d);
230 /* Write end-of-headers record. */
240 return casewriter_create (dict_get_next_value_idx (d),
241 &sys_file_casewriter_class, w);
244 /* Returns value of X truncated to two least-significant digits. */
255 /* Calculates the offset of data for TARGET_VAR from the
256 beginning of each case's data for dictionary D. The return
257 value is in "octs" (8-byte units). */
259 calc_oct_idx (const struct dictionary *d, struct variable *target_var)
265 for (i = 0; i < dict_get_var_cnt (d); i++)
267 struct variable *var = dict_get_var (d, i);
268 if (var == target_var)
270 oct_idx += sfm_width_to_octs (var_get_width (var));
275 /* Write the sysfile_header header to system file W. */
277 write_header (struct sfm_writer *w, const struct dictionary *d)
280 char creation_date[10];
281 char creation_time[9];
282 const char *file_label;
283 struct variable *weight;
287 /* Record-type code. */
288 write_string (w, "$FL2", 4);
290 /* Product identification. */
291 snprintf (prod_name, sizeof prod_name, "@(#) SPSS DATA FILE %s - %s",
292 version, host_system);
293 write_string (w, prod_name, 60);
298 /* Number of `union value's per case. */
299 write_int (w, calc_oct_idx (d, NULL));
302 write_int (w, w->compress);
304 /* Weight variable. */
305 weight = dict_get_weight (d);
306 write_int (w, weight != NULL ? calc_oct_idx (d, weight) + 1 : 0);
308 /* Number of cases. We don't know this in advance, so we write
309 -1 to indicate an unknown number of cases. Later we can
310 come back and overwrite it with the true value. */
313 /* Compression bias. */
314 write_float (w, COMPRESSION_BIAS);
316 /* Creation date and time. */
317 if (time (&t) == (time_t) -1)
319 strcpy (creation_date, "01 Jan 70");
320 strcpy (creation_time, "00:00:00");
324 static const char *month_name[12] =
326 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
327 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
329 struct tm *tmp = localtime (&t);
330 int day = rerange (tmp->tm_mday);
331 int mon = rerange (tmp->tm_mon + 1);
332 int year = rerange (tmp->tm_year);
333 int hour = rerange (tmp->tm_hour + 1);
334 int min = rerange (tmp->tm_min + 1);
335 int sec = rerange (tmp->tm_sec + 1);
337 snprintf (creation_date, sizeof creation_date,
338 "%02d %s %02d", day, month_name[mon - 1], year);
339 snprintf (creation_time, sizeof creation_time,
340 "%02d:%02d:%02d", hour - 1, min - 1, sec - 1);
342 write_string (w, creation_date, 9);
343 write_string (w, creation_time, 8);
346 file_label = dict_get_label (d);
347 if (file_label == NULL)
349 write_string (w, file_label, 64);
355 /* Write format spec FMT to W, after adjusting it to be
356 compatible with the given WIDTH. */
358 write_format (struct sfm_writer *w, struct fmt_spec fmt, int width)
360 assert (fmt_check_output (&fmt));
361 assert (sfm_width_to_segments (width) == 1);
364 fmt_resize (&fmt, width);
365 write_int (w, (fmt_to_io (fmt.type) << 16) | (fmt.w << 8) | fmt.d);
368 /* Write a string continuation variable record for each 8-byte
369 section beyond the initial 8 bytes, for a variable of the
372 write_variable_continuation_records (struct sfm_writer *w, int width)
376 assert (sfm_width_to_segments (width) == 1);
377 for (position = 8; position < width; position += 8)
379 write_int (w, 2); /* Record type. */
380 write_int (w, -1); /* Width. */
381 write_int (w, 0); /* No variable label. */
382 write_int (w, 0); /* No missing values. */
383 write_int (w, 0); /* Print format. */
384 write_int (w, 0); /* Write format. */
385 write_zeros (w, 8); /* Name. */
389 /* Write the variable record(s) for variable V to system file
392 write_variable (struct sfm_writer *w, const struct variable *v)
394 int width = var_get_width (v);
395 int segment_cnt = sfm_width_to_segments (width);
396 int seg0_width = sfm_segment_alloc_width (width, 0);
397 const struct missing_values *mv = var_get_missing_values (v);
404 write_int (w, seg0_width);
406 /* Variable has a variable label? */
407 write_int (w, var_has_label (v));
409 /* Number of missing values. If there is a range, then the
410 range counts as 2 missing values and causes the number to be
412 write_int (w, mv_has_range (mv) ? 2 - mv_n_values (mv) : mv_n_values (mv));
414 /* Print and write formats. */
415 write_format (w, *var_get_print_format (v), seg0_width);
416 write_format (w, *var_get_write_format (v), seg0_width);
419 The full name is in a translation table written
421 write_string (w, var_get_short_name (v, 0), 8);
424 if (var_has_label (v))
426 const char *label = var_get_label (v);
427 size_t padded_len = ROUND_UP (MIN (strlen (label), 255), 4);
428 write_int (w, padded_len);
429 write_string (w, label, padded_len);
432 /* Write the missing values, if any, range first. */
433 if (mv_has_range (mv))
436 mv_peek_range (mv, &x, &y);
440 for (i = 0; i < mv_n_values (mv); i++)
443 mv_peek_value (mv, &value, i);
444 write_value (w, &value, seg0_width);
447 write_variable_continuation_records (w, seg0_width);
449 /* Write additional segments for very long string variables. */
450 for (i = 1; i < segment_cnt; i++)
452 int seg_width = sfm_segment_alloc_width (width, i);
453 struct fmt_spec fmt = fmt_for_output (FMT_A, MAX (seg_width, 1), 0);
455 write_int (w, 2); /* Variable record. */
456 write_int (w, seg_width); /* Width. */
457 write_int (w, 0); /* No variable label. */
458 write_int (w, 0); /* No missing values. */
459 write_format (w, fmt, seg_width); /* Print format. */
460 write_format (w, fmt, seg_width); /* Write format. */
461 write_string (w, var_get_short_name (v, i), 8);
463 write_variable_continuation_records (w, seg_width);
467 /* Writes the value labels for variable V having system file
468 variable index IDX to system file W. */
470 write_value_labels (struct sfm_writer *w, struct variable *v, int idx)
472 const struct val_labs *val_labs;
473 struct val_labs_iterator *i;
476 val_labs = var_get_value_labels (v);
477 if (val_labs == NULL)
480 /* Value label record. */
481 write_int (w, 3); /* Record type. */
482 write_int (w, val_labs_count (val_labs));
483 for (vl = val_labs_first_sorted (val_labs, &i); vl != NULL;
484 vl = val_labs_next (val_labs, &i))
486 uint8_t len = MIN (strlen (vl->label), 255);
488 write_value (w, &vl->value, var_get_width (v));
489 write_bytes (w, &len, 1);
490 write_bytes (w, vl->label, len);
491 write_zeros (w, REM_RND_UP (len + 1, 8));
494 /* Value label variable record. */
495 write_int (w, 4); /* Record type. */
496 write_int (w, 1); /* Number of variables. */
497 write_int (w, idx + 1); /* Variable's dictionary index. */
500 /* Writes record type 6, document record. */
502 write_documents (struct sfm_writer *w, const struct dictionary *d)
504 size_t line_cnt = dict_get_document_line_cnt (d);
506 write_int (w, 6); /* Record type. */
507 write_int (w, line_cnt);
508 write_bytes (w, dict_get_documents (d), line_cnt * DOC_LINE_LENGTH);
511 /* Write the alignment, width and scale values. */
513 write_variable_display_parameters (struct sfm_writer *w,
514 const struct dictionary *dict)
518 write_int (w, 7); /* Record type. */
519 write_int (w, 11); /* Record subtype. */
520 write_int (w, 4); /* Data item (int32) size. */
521 write_int (w, w->segment_cnt * 3); /* Number of data items. */
523 for (i = 0; i < dict_get_var_cnt (dict); ++i)
525 struct variable *v = dict_get_var (dict, i);
526 int width = var_get_width (v);
527 int segment_cnt = sfm_width_to_segments (width);
528 int measure = (var_get_measure (v) == MEASURE_NOMINAL ? 1
529 : var_get_measure (v) == MEASURE_ORDINAL ? 2
531 int alignment = (var_get_alignment (v) == ALIGN_LEFT ? 0
532 : var_get_alignment (v) == ALIGN_RIGHT ? 1
536 for (i = 0; i < segment_cnt; i++)
538 int width_left = width - sfm_segment_effective_offset (width, i);
539 write_int (w, measure);
540 write_int (w, (i == 0 ? var_get_display_width (v)
541 : var_default_display_width (width_left)));
542 write_int (w, alignment);
547 /* Writes the table of lengths for very long string variables. */
549 write_vls_length_table (struct sfm_writer *w,
550 const struct dictionary *dict)
555 ds_init_empty (&map);
556 for (i = 0; i < dict_get_var_cnt (dict); ++i)
558 const struct variable *v = dict_get_var (dict, i);
559 if (sfm_width_to_segments (var_get_width (v)) > 1)
560 ds_put_format (&map, "%s=%05d%c\t",
561 var_get_short_name (v, 0), var_get_width (v), 0);
563 if (!ds_is_empty (&map))
565 write_int (w, 7); /* Record type. */
566 write_int (w, 14); /* Record subtype. */
567 write_int (w, 1); /* Data item (char) size. */
568 write_int (w, ds_length (&map)); /* Number of data items. */
569 write_bytes (w, ds_data (&map), ds_length (&map));
574 /* Writes the long variable name table. */
576 write_longvar_table (struct sfm_writer *w, const struct dictionary *dict)
581 ds_init_empty (&map);
582 for (i = 0; i < dict_get_var_cnt (dict); i++)
584 struct variable *v = dict_get_var (dict, i);
587 ds_put_char (&map, '\t');
588 ds_put_format (&map, "%s=%s",
589 var_get_short_name (v, 0), var_get_name (v));
592 write_int (w, 7); /* Record type. */
593 write_int (w, 13); /* Record subtype. */
594 write_int (w, 1); /* Data item (char) size. */
595 write_int (w, ds_length (&map)); /* Number of data items. */
596 write_bytes (w, ds_data (&map), ds_length (&map));
601 /* Write integer information record. */
603 write_integer_info_record (struct sfm_writer *w)
605 int version_component[3];
608 /* Parse the version string. */
609 memset (version_component, 0, sizeof version_component);
610 sscanf (bare_version, "%d.%d.%d",
611 &version_component[0], &version_component[1], &version_component[2]);
613 /* Figure out the floating-point format. */
614 if (FLOAT_NATIVE_64_BIT == FLOAT_IEEE_DOUBLE_LE
615 || FLOAT_NATIVE_64_BIT == FLOAT_IEEE_DOUBLE_BE)
617 else if (FLOAT_NATIVE_64_BIT == FLOAT_Z_LONG)
619 else if (FLOAT_NATIVE_64_BIT == FLOAT_VAX_D)
625 write_int (w, 7); /* Record type. */
626 write_int (w, 3); /* Record subtype. */
627 write_int (w, 4); /* Data item (int32) size. */
628 write_int (w, 8); /* Number of data items. */
629 write_int (w, version_component[0]);
630 write_int (w, version_component[1]);
631 write_int (w, version_component[2]);
632 write_int (w, -1); /* Machine code. */
633 write_int (w, float_format);
634 write_int (w, 1); /* Compression code. */
635 write_int (w, INTEGER_NATIVE == INTEGER_MSB_FIRST ? 1 : 2);
636 write_int (w, 2); /* 7-bit ASCII. */
639 /* Write floating-point information record. */
641 write_float_info_record (struct sfm_writer *w)
643 write_int (w, 7); /* Record type. */
644 write_int (w, 4); /* Record subtype. */
645 write_int (w, 8); /* Data item (flt64) size. */
646 write_int (w, 3); /* Number of data items. */
647 write_float (w, SYSMIS); /* System-missing value. */
648 write_float (w, HIGHEST); /* Value used for HIGHEST in missing values. */
649 write_float (w, LOWEST); /* Value used for LOWEST in missing values. */
652 /* Writes case C to system file W. */
654 sys_file_casewriter_write (struct casewriter *writer, void *w_,
657 struct sfm_writer *w = w_;
659 if (ferror (w->file))
661 casewriter_force_error (writer);
669 write_case_uncompressed (w, c);
671 write_case_compressed (w, c);
676 /* Destroys system file writer W. */
678 sys_file_casewriter_destroy (struct casewriter *writer, void *w_)
680 struct sfm_writer *w = w_;
681 if (!close_writer (w))
682 casewriter_force_error (writer);
685 /* Returns true if an I/O error has occurred on WRITER, false otherwise. */
687 write_error (const struct sfm_writer *writer)
689 return ferror (writer->file);
692 /* Closes a system file after we're done with it.
693 Returns true if successful, false if an I/O error occurred. */
695 close_writer (struct sfm_writer *w)
706 if (w->opcode_cnt > 0)
707 flush_compressed (w);
710 ok = !write_error (w);
712 /* Seek back to the beginning and update the number of cases.
713 This is just a courtesy to later readers, so there's no need
714 to check return values or report errors. */
715 if (ok && w->case_cnt <= INT32_MAX && !fseek (w->file, 80, SEEK_SET))
717 write_int (w, w->case_cnt);
721 if (fclose (w->file) == EOF)
725 msg (ME, _("An I/O error occurred writing system file \"%s\"."),
726 fh_get_file_name (w->fh));
729 fh_close (w->fh, "system file", "we");
737 /* System file writer casewriter class. */
738 static struct casewriter_class sys_file_casewriter_class =
740 sys_file_casewriter_write,
741 sys_file_casewriter_destroy,
745 /* Writes case C to system file W, without compressing it. */
747 write_case_uncompressed (struct sfm_writer *w, struct ccase *c)
751 for (i = 0; i < w->sfm_var_cnt; i++)
753 struct sfm_var *v = &w->sfm_vars[i];
756 write_float (w, case_num_idx (c, v->case_index));
759 write_bytes (w, case_str_idx (c, v->case_index) + v->offset,
761 write_spaces (w, v->padding);
766 /* Writes case C to system file W, with compression. */
768 write_case_compressed (struct sfm_writer *w, struct ccase *c)
772 for (i = 0; i < w->sfm_var_cnt; i++)
774 struct sfm_var *v = &w->sfm_vars[i];
778 double d = case_num_idx (c, v->case_index);
780 put_cmp_opcode (w, 255);
781 else if (d >= 1 - COMPRESSION_BIAS
782 && d <= 251 - COMPRESSION_BIAS
784 put_cmp_opcode (w, (int) d + COMPRESSION_BIAS);
787 put_cmp_opcode (w, 253);
788 put_cmp_number (w, d);
793 int offset = v->offset;
796 /* This code properly deals with a width that is not a
797 multiple of 8, by ensuring that the final partial
798 oct (8 byte unit) is treated as padded with spaces
800 for (width = v->width; width > 0; width -= 8, offset += 8)
802 const void *data = case_str_idx (c, v->case_index) + offset;
803 int chunk_size = MIN (width, 8);
804 if (!memcmp (data, " ", chunk_size))
805 put_cmp_opcode (w, 254);
808 put_cmp_opcode (w, 253);
809 put_cmp_string (w, data, chunk_size);
813 /* This code deals properly with padding that is not a
814 multiple of 8 bytes, by discarding the remainder,
815 which was already effectively padded with spaces in
816 the previous loop. (Note that v->width + v->padding
817 is always a multiple of 8.) */
818 for (padding = v->padding / 8; padding > 0; padding--)
819 put_cmp_opcode (w, 254);
824 /* Flushes buffered compressed opcodes and data to W.
825 The compression buffer must not be empty. */
827 flush_compressed (struct sfm_writer *w)
829 assert (w->opcode_cnt > 0 && w->opcode_cnt <= 8);
831 write_bytes (w, w->opcodes, w->opcode_cnt);
832 write_zeros (w, 8 - w->opcode_cnt);
834 write_bytes (w, w->data, w->data_cnt * sizeof *w->data);
836 w->opcode_cnt = w->data_cnt = 0;
839 /* Appends OPCODE to the buffered set of compression opcodes in
840 W. Flushes the compression buffer beforehand if necessary. */
842 put_cmp_opcode (struct sfm_writer *w, uint8_t opcode)
844 if (w->opcode_cnt >= 8)
845 flush_compressed (w);
847 w->opcodes[w->opcode_cnt++] = opcode;
850 /* Appends NUMBER to the buffered compression data in W. The
851 buffer must not be full; the way to assure that is to call
852 this function only just after a call to put_cmp_opcode, which
853 will flush the buffer as necessary. */
855 put_cmp_number (struct sfm_writer *w, double number)
857 assert (w->opcode_cnt > 0);
858 assert (w->data_cnt < 8);
860 convert_double_to_output_format (number, w->data[w->data_cnt++]);
863 /* Appends SIZE bytes of DATA to the buffered compression data in
864 W, followed by enough spaces to pad the output data to exactly
865 8 bytes (thus, SIZE must be no greater than 8). The buffer
866 must not be full; the way to assure that is to call this
867 function only just after a call to put_cmp_opcode, which will
868 flush the buffer as necessary. */
870 put_cmp_string (struct sfm_writer *w, const void *data, size_t size)
872 assert (w->opcode_cnt > 0);
873 assert (w->data_cnt < 8);
876 memset (w->data[w->data_cnt], ' ', 8);
877 memcpy (w->data[w->data_cnt], data, size);
881 /* Writes 32-bit integer X to the output file for writer W. */
883 write_int (struct sfm_writer *w, int32_t x)
885 write_bytes (w, &x, sizeof x);
888 /* Converts NATIVE to the 64-bit format used in output files in
891 convert_double_to_output_format (double native, uint8_t output[8])
893 /* If "double" is not a 64-bit type, then convert it to a
894 64-bit type. Otherwise just copy it. */
895 if (FLOAT_NATIVE_DOUBLE != FLOAT_NATIVE_64_BIT)
896 float_convert (FLOAT_NATIVE_DOUBLE, &native, FLOAT_NATIVE_64_BIT, output);
898 memcpy (output, &native, sizeof native);
901 /* Writes floating-point number X to the output file for writer
904 write_float (struct sfm_writer *w, double x)
907 convert_double_to_output_format (x, output);
908 write_bytes (w, output, sizeof output);
911 /* Writes contents of VALUE with the given WIDTH to W, padding
912 with zeros to a multiple of 8 bytes.
913 To avoid a branch, and because we don't actually need to
914 support it, WIDTH must be no bigger than 8. */
916 write_value (struct sfm_writer *w, const union value *value, int width)
920 write_float (w, value->f);
923 write_bytes (w, value->s, width);
924 write_zeros (w, 8 - width);
928 /* Writes null-terminated STRING in a field of the given WIDTH to
929 W. If WIDTH is longer than WIDTH, it is truncated; if WIDTH
930 is narrowed, it is padded on the right with spaces. */
932 write_string (struct sfm_writer *w, const char *string, size_t width)
934 size_t data_bytes = MIN (strlen (string), width);
935 size_t pad_bytes = width - data_bytes;
936 write_bytes (w, string, data_bytes);
937 while (pad_bytes-- > 0)
941 /* Writes SIZE bytes of DATA to W's output file. */
943 write_bytes (struct sfm_writer *w, const void *data, size_t size)
945 fwrite (data, 1, size, w->file);
948 /* Writes N zeros to W's output file. */
950 write_zeros (struct sfm_writer *w, size_t n)
956 /* Writes N spaces to W's output file. */
958 write_spaces (struct sfm_writer *w, size_t n)