1 /* PSPP - computes sample statistics.
2 Copyright (C) 1997-9, 2000, 2006 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or
5 modify it under the terms of the GNU General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 This program is distributed in the hope that it will be useful, but
10 WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 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, write to the Free Software
16 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 #include "sys-file-writer.h"
22 #include "sys-file-private.h"
32 #include <libpspp/alloc.h>
33 #include <libpspp/hash.h>
34 #include <libpspp/magic.h>
35 #include <libpspp/message.h>
36 #include <libpspp/misc.h>
37 #include <libpspp/str.h>
38 #include <libpspp/version.h>
41 #include "dictionary.h"
42 #include "file-handle-def.h"
44 #include "missing-values.h"
46 #include "value-labels.h"
49 #include "stat-macros.h"
53 #define _(msgid) gettext (msgid)
55 /* Find 64-bit floating-point type. */
58 #define FLT64_MAX FLT_MAX
59 #elif SIZEOF_DOUBLE == 8
61 #define FLT64_MAX DBL_MAX
62 #elif SIZEOF_LONG_DOUBLE == 8
63 #define flt64 long double
64 #define FLT64_MAX LDBL_MAX
66 #error Which one of your basic types is 64-bit floating point?
69 /* Figure out SYSMIS value for flt64. */
70 #include <libpspp/magic.h>
71 #if SIZEOF_DOUBLE == 8
72 #define second_lowest_flt64 second_lowest_value
74 #error Must define second_lowest_flt64 for your architecture.
77 /* Record Type 1: General Information. */
80 char rec_type[4] ; /* 00: Record-type code, "$FL2". */
81 char prod_name[60] ; /* 04: Product identification. */
82 int32_t layout_code ; /* 40: 2. */
83 int32_t nominal_case_size ; /* 44: Number of `value's per case.
84 Note: some systems set this to -1 */
85 int32_t compress ; /* 48: 1=compressed, 0=not compressed. */
86 int32_t weight_idx ; /* 4c: 1-based index of weighting var, or 0. */
87 int32_t case_cnt ; /* 50: Number of cases, -1 if unknown. */
88 flt64 bias ; /* 54: Compression bias (100.0). */
89 char creation_date[9] ; /* 5c: `dd mmm yy' creation date of file. */
90 char creation_time[8] ; /* 65: `hh:mm:ss' 24-hour creation time. */
91 char file_label[64] ; /* 6d: File label. */
92 char padding[3] ; /* ad: Ignored padding. */
93 } ATTRIBUTE((packed)) ;
95 /* Record Type 2: Variable. */
96 struct sysfile_variable
98 int32_t rec_type ; /* 2. */
99 int32_t type ; /* 0=numeric, 1-255=string width,
100 -1=continued string. */
101 int32_t has_var_label ; /* 1=has a variable label, 0=doesn't. */
102 int32_t n_missing_values ; /* Missing value code of -3,-2,0,1,2, or 3. */
103 int32_t print ; /* Print format. */
104 int32_t write ; /* Write format. */
105 char name[SHORT_NAME_LEN] ; /* Variable name. */
106 /* The rest of the structure varies. */
107 } ATTRIBUTE((packed)) ;
109 /* Compression bias used by PSPP. Values between (1 -
110 COMPRESSION_BIAS) and (251 - COMPRESSION_BIAS) inclusive can be
112 #define COMPRESSION_BIAS 100
114 /* System file writer. */
117 struct file_handle *fh; /* File handle. */
118 FILE *file; /* File stream. */
120 int needs_translation; /* 0=use fast path, 1=translation needed. */
121 int compress; /* 1=compressed, 0=not compressed. */
122 int case_cnt; /* Number of cases written so far. */
123 size_t flt64_cnt; /* Number of flt64 elements in case. */
124 bool has_vls; /* Does the dict have very long strings? */
126 /* Compression buffering. */
127 flt64 *buf; /* Buffered data. */
128 flt64 *end; /* Buffer end. */
129 flt64 *ptr; /* Current location in buffer. */
130 unsigned char *x; /* Location in current instruction octet. */
131 unsigned char *y; /* End of instruction octet. */
134 struct sfm_var *vars; /* Variables. */
135 size_t var_cnt; /* Number of variables. */
136 size_t var_cnt_vls; /* Number of variables including
137 very long string components. */
140 /* A variable in a system file. */
143 int width; /* 0=numeric, otherwise string width. */
144 int fv; /* Index into case. */
145 size_t flt64_cnt; /* Number of flt64 elements. */
148 static char *append_string_max (char *, const char *, const char *);
149 static void write_header (struct sfm_writer *, const struct dictionary *);
150 static void buf_write (struct sfm_writer *, const void *, size_t);
151 static void write_variable (struct sfm_writer *, const struct variable *);
152 static void write_value_labels (struct sfm_writer *,
153 struct variable *, int idx);
154 static void write_rec_7_34 (struct sfm_writer *);
156 static void write_longvar_table (struct sfm_writer *w,
157 const struct dictionary *dict);
159 static void write_vls_length_table (struct sfm_writer *w,
160 const struct dictionary *dict);
163 static void write_variable_display_parameters (struct sfm_writer *w,
164 const struct dictionary *dict);
166 static void write_documents (struct sfm_writer *, const struct dictionary *);
169 var_flt64_cnt (const struct variable *v)
171 assert(sizeof(flt64) == MAX_SHORT_STRING);
172 return sfm_width_to_bytes(var_get_width (v)) / MAX_SHORT_STRING ;
176 var_flt64_cnt_nom (const struct variable *v)
178 return (var_is_numeric (v)
179 ? 1 : DIV_RND_UP (var_get_width (v), sizeof (flt64)));
183 /* Returns default options for writing a system file. */
184 struct sfm_write_options
185 sfm_writer_default_options (void)
187 struct sfm_write_options opts;
188 opts.create_writeable = true;
189 opts.compress = get_scompression ();
195 /* Return a short variable name to be used as the continuation of the
196 variable with the short name SN.
198 FIXME: Need to resolve clashes somehow.
202 cont_var_name(const char *sn, int idx)
204 static char s[SHORT_NAME_LEN + 1];
206 char abb[SHORT_NAME_LEN + 1 - 3]= {0};
208 strncpy(abb, sn, SHORT_NAME_LEN - 3);
210 snprintf(s, SHORT_NAME_LEN + 1, "%s%03d", abb, idx);
216 /* Opens the system file designated by file handle FH for writing
217 cases from dictionary D according to the given OPTS. If
218 COMPRESS is nonzero, the system file will be compressed.
220 No reference to D is retained, so it may be modified or
221 destroyed at will after this function returns. D is not
222 modified by this function, except to assign short names. */
224 sfm_open_writer (struct file_handle *fh, struct dictionary *d,
225 struct sfm_write_options opts)
227 struct sfm_writer *w = NULL;
234 if (opts.version != 2 && opts.version != 3)
236 msg (ME, _("Unknown system file version %d. Treating as version %d."),
242 mode = S_IRUSR | S_IRGRP | S_IROTH;
243 if (opts.create_writeable)
244 mode |= S_IWUSR | S_IWGRP | S_IWOTH;
245 fd = open (fh_get_file_name (fh), O_WRONLY | O_CREAT | O_TRUNC, mode);
249 /* Open file handle. */
250 if (!fh_open (fh, FH_REF_FILE, "system file", "we"))
253 /* Create and initialize writer. */
254 w = xmalloc (sizeof *w);
256 w->file = fdopen (fd, "w");
258 w->needs_translation = dict_compacting_would_change (d);
259 w->compress = opts.compress;
264 w->buf = w->end = w->ptr = NULL;
267 w->var_cnt = dict_get_var_cnt (d);
268 w->var_cnt_vls = w->var_cnt;
269 w->vars = xnmalloc (w->var_cnt, sizeof *w->vars);
270 for (i = 0; i < w->var_cnt; i++)
272 const struct variable *dv = dict_get_var (d, i);
273 struct sfm_var *sv = &w->vars[i];
274 sv->width = var_get_width (dv);
275 /* spss compatibility nonsense */
276 if ( var_get_width (dv) >= MIN_VERY_LONG_STRING )
279 sv->fv = var_get_case_index (dv);
280 sv->flt64_cnt = var_flt64_cnt (dv);
283 /* Check that file create succeeded. */
290 /* Write the file header. */
293 /* Write basic variable info. */
294 dict_assign_short_names (d);
295 for (i = 0; i < dict_get_var_cnt (d); i++)
298 const struct variable *v = dict_get_var(d, i);
299 int wcount = var_get_width (v);
302 struct variable *var_cont = var_clone (v);
303 var_set_short_name (var_cont, var_get_short_name (v));
304 if ( var_is_alpha (v))
308 var_clear_missing_values (var_cont);
309 var_set_short_name (var_cont,
310 cont_var_name (var_get_short_name (v),
312 var_clear_label (var_cont);
316 if ( wcount >= MIN_VERY_LONG_STRING )
318 var_set_width (var_cont, MIN_VERY_LONG_STRING - 1);
319 wcount -= EFFECTIVE_LONG_STRING_LENGTH;
323 var_set_width (var_cont, wcount);
324 wcount -= var_get_width (var_cont);
328 write_variable (w, var_cont);
329 var_destroy (var_cont);
333 /* Write out value labels. */
334 for (idx = i = 0; i < dict_get_var_cnt (d); i++)
336 struct variable *v = dict_get_var (d, i);
338 write_value_labels (w, v, idx);
339 idx += var_flt64_cnt (v);
342 if (dict_get_documents (d) != NULL)
343 write_documents (w, d);
347 write_variable_display_parameters (w, d);
349 if (opts.version >= 3)
350 write_longvar_table (w, d);
352 write_vls_length_table(w, d);
354 /* Write end-of-headers record. */
360 } ATTRIBUTE((packed))
363 rec_999.rec_type = 999;
366 buf_write (w, &rec_999, sizeof rec_999);
371 w->buf = xnmalloc (128, sizeof *w->buf);
373 w->end = &w->buf[128];
374 w->x = (unsigned char *) w->ptr++;
375 w->y = (unsigned char *) w->ptr;
378 if (sfm_write_error (w))
384 sfm_close_writer (w);
388 msg (ME, _("Error opening \"%s\" for writing as a system file: %s."),
389 fh_get_file_name (fh), strerror (errno));
393 /* Returns value of X truncated to two least-significant digits. */
404 /* Write the sysfile_header header to system file W. */
406 write_header (struct sfm_writer *w, const struct dictionary *d)
408 struct sysfile_header hdr;
414 memcpy (hdr.rec_type, "$FL2", 4);
416 p = stpcpy (hdr.prod_name, "@(#) SPSS DATA FILE ");
417 p = append_string_max (p, version, &hdr.prod_name[60]);
418 p = append_string_max (p, " - ", &hdr.prod_name[60]);
419 p = append_string_max (p, host_system, &hdr.prod_name[60]);
420 memset (p, ' ', &hdr.prod_name[60] - p);
425 for (i = 0; i < dict_get_var_cnt (d); i++)
427 w->flt64_cnt += var_flt64_cnt (dict_get_var (d, i));
429 hdr.nominal_case_size = w->flt64_cnt;
431 hdr.compress = w->compress;
433 if (dict_get_weight (d) != NULL)
435 const struct variable *weight_var;
436 int recalc_weight_idx = 1;
439 weight_var = dict_get_weight (d);
442 struct variable *v = dict_get_var (d, i);
445 recalc_weight_idx += var_flt64_cnt (v);
447 hdr.weight_idx = recalc_weight_idx;
453 hdr.bias = COMPRESSION_BIAS;
455 if (time (&t) == (time_t) -1)
457 memcpy (hdr.creation_date, "01 Jan 70", 9);
458 memcpy (hdr.creation_time, "00:00:00", 8);
462 static const char *month_name[12] =
464 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
465 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
467 struct tm *tmp = localtime (&t);
468 int day = rerange (tmp->tm_mday);
469 int mon = rerange (tmp->tm_mon + 1);
470 int year = rerange (tmp->tm_year);
471 int hour = rerange (tmp->tm_hour + 1);
472 int min = rerange (tmp->tm_min + 1);
473 int sec = rerange (tmp->tm_sec + 1);
476 sprintf (buf, "%02d %s %02d", day, month_name[mon - 1], year);
477 memcpy (hdr.creation_date, buf, sizeof hdr.creation_date);
478 sprintf (buf, "%02d:%02d:%02d", hour - 1, min - 1, sec - 1);
479 memcpy (hdr.creation_time, buf, sizeof hdr.creation_time);
483 const char *label = dict_get_label (d);
487 buf_copy_str_rpad (hdr.file_label, sizeof hdr.file_label, label);
490 memset (hdr.padding, 0, sizeof hdr.padding);
492 buf_write (w, &hdr, sizeof hdr);
495 /* Translates format spec from internal form in SRC to system file
498 write_format_spec (const struct fmt_spec *src, int32_t *dest)
500 assert (fmt_check_output (src));
501 *dest = (fmt_to_io (src->type) << 16) | (src->w << 8) | src->d;
504 /* Write the variable record(s) for primary variable P and secondary
505 variable S to system file W. */
507 write_variable (struct sfm_writer *w, const struct variable *v)
509 struct sysfile_variable sv;
511 /* Missing values. */
512 struct missing_values mv;
513 flt64 m[3]; /* Missing value values. */
514 int nm; /* Number of missing values, possibly negative. */
515 const char *label = var_get_label (v);
518 sv.type = MIN (var_get_width (v), MIN_VERY_LONG_STRING - 1);
519 sv.has_var_label = label != NULL;
521 mv_copy (&mv, var_get_missing_values (v));
523 if (mv_has_range (&mv))
526 mv_pop_range (&mv, &x, &y);
527 m[nm++] = x == LOWEST ? second_lowest_flt64 : x;
528 m[nm++] = y == HIGHEST ? FLT64_MAX : y;
530 while (mv_has_value (&mv))
533 mv_pop_value (&mv, &value);
534 if (var_is_numeric (v))
537 buf_copy_rpad ((char *) &m[nm], sizeof m[nm], value.s,
541 if (mv_has_range (var_get_missing_values (v)))
544 sv.n_missing_values = nm;
545 write_format_spec (var_get_print_format (v), &sv.print);
546 write_format_spec (var_get_write_format (v), &sv.write);
547 buf_copy_str_rpad (sv.name, sizeof sv.name, var_get_short_name (v));
548 buf_write (w, &sv, sizeof sv);
556 } ATTRIBUTE((packed))
561 l.label_len = MIN (strlen (label), 255);
562 ext_len = ROUND_UP (l.label_len, sizeof l.label_len);
563 memcpy (l.label, label, l.label_len);
564 memset (&l.label[l.label_len], ' ', ext_len - l.label_len);
566 buf_write (w, &l, offsetof (struct label, label) + ext_len);
570 buf_write (w, m, sizeof *m * abs (nm));
572 if (var_is_alpha (v) && var_get_width (v) > (int) sizeof (flt64))
578 sv.has_var_label = 0;
579 sv.n_missing_values = 0;
580 memset (&sv.print, 0, sizeof sv.print);
581 memset (&sv.write, 0, sizeof sv.write);
582 memset (&sv.name, 0, sizeof sv.name);
584 pad_count = DIV_RND_UP (MIN(var_get_width (v), MIN_VERY_LONG_STRING - 1),
585 (int) sizeof (flt64)) - 1;
586 for (i = 0; i < pad_count; i++)
587 buf_write (w, &sv, sizeof sv);
591 /* Writes the value labels for variable V having system file
592 variable index IDX to system file W. */
594 write_value_labels (struct sfm_writer *w, struct variable *v, int idx)
596 struct value_label_rec
601 } ATTRIBUTE((packed));
608 } ATTRIBUTE((packed));
610 const struct val_labs *val_labs;
611 struct val_labs_iterator *i;
612 struct value_label_rec *vlr;
613 struct var_idx_rec vir;
618 val_labs = var_get_value_labels (v);
619 if (val_labs == NULL)
622 /* Pass 1: Count bytes. */
623 vlr_size = (sizeof (struct value_label_rec)
624 + sizeof (flt64) * (val_labs_count (val_labs) - 1));
625 for (vl = val_labs_first (val_labs, &i); vl != NULL;
626 vl = val_labs_next (val_labs, &i))
627 vlr_size += ROUND_UP (strlen (vl->label) + 1, sizeof (flt64));
629 /* Pass 2: Copy bytes. */
630 vlr = xmalloc (vlr_size);
632 vlr->n_labels = val_labs_count (val_labs);
634 for (vl = val_labs_first_sorted (val_labs, &i); vl != NULL;
635 vl = val_labs_next (val_labs, &i))
637 size_t len = strlen (vl->label);
639 *loc++ = vl->value.f;
640 *(unsigned char *) loc = len;
641 memcpy (&((char *) loc)[1], vl->label, len);
642 memset (&((char *) loc)[1 + len], ' ',
643 REM_RND_UP (len + 1, sizeof (flt64)));
644 loc += DIV_RND_UP (len + 1, sizeof (flt64));
647 buf_write (w, vlr, vlr_size);
652 vir.vars[0] = idx + 1;
653 buf_write (w, &vir, sizeof vir);
656 /* Writes record type 6, document record. */
658 write_documents (struct sfm_writer *w, const struct dictionary *d)
662 int32_t rec_type ; /* Always 6. */
663 int32_t n_lines ; /* Number of lines of documents. */
664 } ATTRIBUTE((packed)) rec_6;
666 const char *documents;
669 documents = dict_get_documents (d);
670 n_lines = strlen (documents) / 80;
673 rec_6.n_lines = n_lines;
674 buf_write (w, &rec_6, sizeof rec_6);
675 buf_write (w, documents, 80 * n_lines);
678 /* Write the alignment, width and scale values */
680 write_variable_display_parameters (struct sfm_writer *w,
681 const struct dictionary *dict)
691 } ATTRIBUTE((packed)) vdp_hdr;
693 vdp_hdr.rec_type = 7;
694 vdp_hdr.subtype = 11;
695 vdp_hdr.elem_size = 4;
696 vdp_hdr.n_elem = w->var_cnt_vls * 3;
698 buf_write (w, &vdp_hdr, sizeof vdp_hdr);
700 for ( i = 0 ; i < w->var_cnt ; ++i )
708 } ATTRIBUTE((packed)) params;
710 v = dict_get_var(dict, i);
712 params.measure = (var_get_measure (v) == MEASURE_NOMINAL ? 1
713 : var_get_measure (v) == MEASURE_ORDINAL ? 2
715 params.width = var_get_display_width (v);
716 params.align = (var_get_alignment (v) == ALIGN_LEFT ? 0
717 : var_get_alignment (v) == ALIGN_RIGHT ? 1
720 buf_write (w, ¶ms, sizeof(params));
722 if (var_is_long_string (v))
724 int wcount = var_get_width (v) - EFFECTIVE_LONG_STRING_LENGTH ;
728 params.width = wcount >= MIN_VERY_LONG_STRING ? 32 : wcount;
730 buf_write (w, ¶ms, sizeof(params));
732 wcount -= EFFECTIVE_LONG_STRING_LENGTH ;
738 /* Writes the table of lengths for Very Long String Variables */
740 write_vls_length_table (struct sfm_writer *w,
741 const struct dictionary *dict)
750 } ATTRIBUTE((packed)) vls_hdr;
752 struct string vls_length_map;
754 ds_init_empty (&vls_length_map);
756 vls_hdr.rec_type = 7;
757 vls_hdr.subtype = 14;
758 vls_hdr.elem_size = 1;
761 for (i = 0; i < dict_get_var_cnt (dict); ++i)
763 const struct variable *v = dict_get_var (dict, i);
765 if ( var_get_width (v) < MIN_VERY_LONG_STRING )
768 ds_put_format (&vls_length_map, "%s=%05d",
769 var_get_short_name (v), var_get_width (v));
770 ds_put_char (&vls_length_map, '\0');
771 ds_put_char (&vls_length_map, '\t');
774 vls_hdr.n_elem = ds_length (&vls_length_map);
776 if ( vls_hdr.n_elem > 0 )
778 buf_write (w, &vls_hdr, sizeof vls_hdr);
779 buf_write (w, ds_data (&vls_length_map), ds_length (&vls_length_map));
782 ds_destroy (&vls_length_map);
785 /* Writes the long variable name table */
787 write_longvar_table (struct sfm_writer *w, const struct dictionary *dict)
795 } ATTRIBUTE((packed)) lv_hdr;
797 struct string long_name_map;
800 ds_init_empty (&long_name_map);
801 for (i = 0; i < dict_get_var_cnt (dict); i++)
803 struct variable *v = dict_get_var (dict, i);
806 ds_put_char (&long_name_map, '\t');
807 ds_put_format (&long_name_map, "%s=%s",
808 var_get_short_name (v), var_get_name (v));
813 lv_hdr.elem_size = 1;
814 lv_hdr.n_elem = ds_length (&long_name_map);
816 buf_write (w, &lv_hdr, sizeof lv_hdr);
817 buf_write (w, ds_data (&long_name_map), ds_length (&long_name_map));
819 ds_destroy (&long_name_map);
822 /* Writes record type 7, subtypes 3 and 4. */
824 write_rec_7_34 (struct sfm_writer *w)
830 int32_t data_type_3 ;
835 int32_t data_type_4 ;
838 } ATTRIBUTE((packed)) rec_7;
840 /* Components of the version number, from major to minor. */
841 int version_component[3];
843 /* Used to step through the version string. */
846 /* Parses the version string, which is assumed to be of the form
847 #.#x, where each # is a string of digits, and x is a single
849 version_component[0] = strtol (bare_version, &p, 10);
852 version_component[1] = strtol (bare_version, &p, 10);
853 version_component[2] = (isalpha ((unsigned char) *p)
854 ? tolower ((unsigned char) *p) - 'a' : 0);
856 rec_7.rec_type_3 = 7;
858 rec_7.data_type_3 = sizeof (int32_t);
860 rec_7.elem_3[0] = version_component[0];
861 rec_7.elem_3[1] = version_component[1];
862 rec_7.elem_3[2] = version_component[2];
863 rec_7.elem_3[3] = -1;
865 /* PORTME: 1=IEEE754, 2=IBM 370, 3=DEC VAX E. */
872 /* PORTME: 1=big-endian, 2=little-endian. */
879 /* PORTME: 1=EBCDIC, 2=7-bit ASCII, 3=8-bit ASCII, 4=DEC Kanji. */
882 rec_7.rec_type_4 = 7;
884 rec_7.data_type_4 = sizeof (flt64);
886 rec_7.elem_4[0] = -FLT64_MAX;
887 rec_7.elem_4[1] = FLT64_MAX;
888 rec_7.elem_4[2] = second_lowest_flt64;
890 buf_write (w, &rec_7, sizeof rec_7);
893 /* Write NBYTES starting at BUF to the system file represented by
896 buf_write (struct sfm_writer *w, const void *buf, size_t nbytes)
898 assert (buf != NULL);
899 fwrite (buf, nbytes, 1, w->file);
902 /* Copies string DEST to SRC with the proviso that DEST does not reach
903 byte END; no null terminator is copied. Returns a pointer to the
904 byte after the last byte copied. */
906 append_string_max (char *dest, const char *src, const char *end)
908 int nbytes = MIN (end - dest, (int) strlen (src));
909 memcpy (dest, src, nbytes);
910 return dest + nbytes;
913 /* Makes certain that the compression buffer of H has room for another
914 element. If there's not room, pads out the current instruction
915 octet with zero and dumps out the buffer. */
917 ensure_buf_space (struct sfm_writer *w)
919 if (w->ptr >= w->end)
921 memset (w->x, 0, w->y - w->x);
924 buf_write (w, w->buf, sizeof *w->buf * 128);
928 static void write_compressed_data (struct sfm_writer *w, const flt64 *elem);
930 /* Writes case C to system file W.
931 Returns 1 if successful, 0 if an I/O error occurred. */
933 sfm_write_case (struct sfm_writer *w, const struct ccase *c)
935 if (ferror (w->file))
940 if (!w->needs_translation && !w->compress
941 && sizeof (flt64) == sizeof (union value) && ! w->has_vls )
943 /* Fast path: external and internal representations are the
944 same and the dictionary is properly ordered. Write
946 buf_write (w, case_data_all (c), sizeof (union value) * w->flt64_cnt);
950 /* Slow path: internal and external representations differ.
951 Write into a bounce buffer, then write to W. */
958 bounce_size = sizeof *bounce * w->flt64_cnt;
959 bounce = bounce_cur = local_alloc (bounce_size);
960 bounce_end = bounce + bounce_size;
962 for (i = 0; i < w->var_cnt; i++)
964 struct sfm_var *v = &w->vars[i];
966 memset(bounce_cur, ' ', v->flt64_cnt * sizeof (flt64));
970 *bounce_cur = case_num_idx (c, v->fv);
971 bounce_cur += v->flt64_cnt;
975 while (ofs < v->width)
977 int chunk = MIN (MIN_VERY_LONG_STRING - 1, v->width - ofs);
978 int nv = DIV_RND_UP (chunk, sizeof (flt64));
979 buf_copy_rpad ((char *) bounce_cur, nv * sizeof (flt64),
980 case_data_idx (c, v->fv)->s + ofs, chunk);
989 buf_write (w, bounce, bounce_size);
991 write_compressed_data (w, bounce);
996 return !sfm_write_error (w);
1000 put_instruction (struct sfm_writer *w, unsigned char instruction)
1004 ensure_buf_space (w);
1005 w->x = (unsigned char *) w->ptr++;
1006 w->y = (unsigned char *) w->ptr;
1008 *w->x++ = instruction;
1012 put_element (struct sfm_writer *w, const flt64 *elem)
1014 ensure_buf_space (w);
1015 memcpy (w->ptr++, elem, sizeof *elem);
1019 write_compressed_data (struct sfm_writer *w, const flt64 *elem)
1023 for (i = 0; i < w->var_cnt; i++)
1025 struct sfm_var *v = &w->vars[i];
1029 if (*elem == -FLT64_MAX)
1030 put_instruction (w, 255);
1031 else if (*elem >= 1 - COMPRESSION_BIAS
1032 && *elem <= 251 - COMPRESSION_BIAS
1033 && *elem == (int) *elem)
1034 put_instruction (w, (int) *elem + COMPRESSION_BIAS);
1037 put_instruction (w, 253);
1038 put_element (w, elem);
1046 for (j = 0; j < v->flt64_cnt; j++, elem++)
1048 if (!memcmp (elem, " ", sizeof (flt64)))
1049 put_instruction (w, 254);
1052 put_instruction (w, 253);
1053 put_element (w, elem);
1060 /* Returns true if an I/O error has occurred on WRITER, false otherwise. */
1062 sfm_write_error (const struct sfm_writer *writer)
1064 return ferror (writer->file);
1067 /* Closes a system file after we're done with it.
1068 Returns true if successful, false if an I/O error occurred. */
1070 sfm_close_writer (struct sfm_writer *w)
1078 if (w->file != NULL)
1081 if (w->buf != NULL && w->ptr > w->buf)
1083 memset (w->x, 0, w->y - w->x);
1084 buf_write (w, w->buf, (w->ptr - w->buf) * sizeof *w->buf);
1088 ok = !sfm_write_error (w);
1090 /* Seek back to the beginning and update the number of cases.
1091 This is just a courtesy to later readers, so there's no need
1092 to check return values or report errors. */
1093 if (ok && !fseek (w->file, offsetof (struct sysfile_header, case_cnt),
1096 int32_t case_cnt = w->case_cnt;
1097 fwrite (&case_cnt, sizeof case_cnt, 1, w->file);
1101 if (fclose (w->file) == EOF)
1105 msg (ME, _("An I/O error occurred writing system file \"%s\"."),
1106 fh_get_file_name (w->fh));
1109 fh_close (w->fh, "system file", "we");