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"
52 #define _(msgid) gettext (msgid)
54 /* Find 64-bit floating-point type. */
57 #define FLT64_MAX FLT_MAX
58 #elif SIZEOF_DOUBLE == 8
60 #define FLT64_MAX DBL_MAX
61 #elif SIZEOF_LONG_DOUBLE == 8
62 #define flt64 long double
63 #define FLT64_MAX LDBL_MAX
65 #error Which one of your basic types is 64-bit floating point?
68 /* Figure out SYSMIS value for flt64. */
69 #include <libpspp/magic.h>
70 #if SIZEOF_DOUBLE == 8
71 #define second_lowest_flt64 second_lowest_value
73 #error Must define second_lowest_flt64 for your architecture.
76 /* Record Type 1: General Information. */
79 char rec_type[4] ; /* 00: Record-type code, "$FL2". */
80 char prod_name[60] ; /* 04: Product identification. */
81 int32_t layout_code ; /* 40: 2. */
82 int32_t nominal_case_size ; /* 44: Number of `value's per case.
83 Note: some systems set this to -1 */
84 int32_t compress ; /* 48: 1=compressed, 0=not compressed. */
85 int32_t weight_idx ; /* 4c: 1-based index of weighting var, or 0. */
86 int32_t case_cnt ; /* 50: Number of cases, -1 if unknown. */
87 flt64 bias ; /* 54: Compression bias (100.0). */
88 char creation_date[9] ; /* 5c: `dd mmm yy' creation date of file. */
89 char creation_time[8] ; /* 65: `hh:mm:ss' 24-hour creation time. */
90 char file_label[64] ; /* 6d: File label. */
91 char padding[3] ; /* ad: Ignored padding. */
92 } ATTRIBUTE((packed)) ;
94 /* Record Type 2: Variable. */
95 struct sysfile_variable
97 int32_t rec_type ; /* 2. */
98 int32_t type ; /* 0=numeric, 1-255=string width,
99 -1=continued string. */
100 int32_t has_var_label ; /* 1=has a variable label, 0=doesn't. */
101 int32_t n_missing_values ; /* Missing value code of -3,-2,0,1,2, or 3. */
102 int32_t print ; /* Print format. */
103 int32_t write ; /* Write format. */
104 char name[SHORT_NAME_LEN] ; /* Variable name. */
105 /* The rest of the structure varies. */
106 } ATTRIBUTE((packed)) ;
108 /* Compression bias used by PSPP. Values between (1 -
109 COMPRESSION_BIAS) and (251 - COMPRESSION_BIAS) inclusive can be
111 #define COMPRESSION_BIAS 100
113 /* System file writer. */
116 struct file_handle *fh; /* File handle. */
117 FILE *file; /* File stream. */
119 int needs_translation; /* 0=use fast path, 1=translation needed. */
120 int compress; /* 1=compressed, 0=not compressed. */
121 int case_cnt; /* Number of cases written so far. */
122 size_t flt64_cnt; /* Number of flt64 elements in case. */
123 bool has_vls; /* Does the dict have very long strings? */
125 /* Compression buffering. */
126 flt64 *buf; /* Buffered data. */
127 flt64 *end; /* Buffer end. */
128 flt64 *ptr; /* Current location in buffer. */
129 unsigned char *x; /* Location in current instruction octet. */
130 unsigned char *y; /* End of instruction octet. */
133 struct sfm_var *vars; /* Variables. */
134 size_t var_cnt; /* Number of variables. */
135 size_t var_cnt_vls; /* Number of variables including
136 very long string components. */
139 /* A variable in a system file. */
142 int width; /* 0=numeric, otherwise string width. */
143 int fv; /* Index into case. */
144 size_t flt64_cnt; /* Number of flt64 elements. */
147 static char *append_string_max (char *, const char *, const char *);
148 static void write_header (struct sfm_writer *, const struct dictionary *);
149 static void buf_write (struct sfm_writer *, const void *, size_t);
150 static void write_variable (struct sfm_writer *, const struct variable *);
151 static void write_value_labels (struct sfm_writer *,
152 struct variable *, int idx);
153 static void write_rec_7_34 (struct sfm_writer *);
155 static void write_longvar_table (struct sfm_writer *w,
156 const struct dictionary *dict);
158 static void write_vls_length_table (struct sfm_writer *w,
159 const struct dictionary *dict);
162 static void write_variable_display_parameters (struct sfm_writer *w,
163 const struct dictionary *dict);
165 static void write_documents (struct sfm_writer *, const struct dictionary *);
168 var_flt64_cnt (const struct variable *v)
170 assert(sizeof(flt64) == MAX_SHORT_STRING);
171 return sfm_width_to_bytes(var_get_width (v)) / MAX_SHORT_STRING ;
175 var_flt64_cnt_nom (const struct variable *v)
177 return (var_is_numeric (v)
178 ? 1 : DIV_RND_UP (var_get_width (v), sizeof (flt64)));
182 /* Returns default options for writing a system file. */
183 struct sfm_write_options
184 sfm_writer_default_options (void)
186 struct sfm_write_options opts;
187 opts.create_writeable = true;
188 opts.compress = get_scompression ();
194 /* Return a short variable name to be used as the continuation of the
195 variable with the short name SN.
197 FIXME: Need to resolve clashes somehow.
201 cont_var_name(const char *sn, int idx)
203 static char s[SHORT_NAME_LEN + 1];
205 char abb[SHORT_NAME_LEN + 1 - 3]= {0};
207 strncpy(abb, sn, SHORT_NAME_LEN - 3);
209 snprintf(s, SHORT_NAME_LEN + 1, "%s%03d", abb, idx);
215 /* Opens the system file designated by file handle FH for writing
216 cases from dictionary D according to the given OPTS. If
217 COMPRESS is nonzero, the system file will be compressed.
219 No reference to D is retained, so it may be modified or
220 destroyed at will after this function returns. D is not
221 modified by this function, except to assign short names. */
223 sfm_open_writer (struct file_handle *fh, struct dictionary *d,
224 struct sfm_write_options opts)
226 struct sfm_writer *w = NULL;
233 if (opts.version != 2 && opts.version != 3)
235 msg (ME, _("Unknown system file version %d. Treating as version %d."),
241 mode = S_IRUSR | S_IRGRP | S_IROTH;
242 if (opts.create_writeable)
243 mode |= S_IWUSR | S_IWGRP | S_IWOTH;
244 fd = open (fh_get_file_name (fh), O_WRONLY | O_CREAT | O_TRUNC, mode);
248 /* Open file handle. */
249 if (!fh_open (fh, FH_REF_FILE, "system file", "we"))
252 /* Create and initialize writer. */
253 w = xmalloc (sizeof *w);
255 w->file = fdopen (fd, "w");
257 w->needs_translation = dict_compacting_would_change (d);
258 w->compress = opts.compress;
263 w->buf = w->end = w->ptr = NULL;
266 w->var_cnt = dict_get_var_cnt (d);
267 w->var_cnt_vls = w->var_cnt;
268 w->vars = xnmalloc (w->var_cnt, sizeof *w->vars);
269 for (i = 0; i < w->var_cnt; i++)
271 const struct variable *dv = dict_get_var (d, i);
272 struct sfm_var *sv = &w->vars[i];
273 sv->width = var_get_width (dv);
274 /* spss compatibility nonsense */
275 if ( var_get_width (dv) >= MIN_VERY_LONG_STRING )
278 sv->fv = var_get_case_index (dv);
279 sv->flt64_cnt = var_flt64_cnt (dv);
282 /* Check that file create succeeded. */
289 /* Write the file header. */
292 /* Write basic variable info. */
293 dict_assign_short_names (d);
294 for (i = 0; i < dict_get_var_cnt (d); i++)
297 const struct variable *v = dict_get_var(d, i);
298 int wcount = var_get_width (v);
301 struct variable *var_cont = var_clone (v);
302 var_set_short_name (var_cont, var_get_short_name (v));
303 if ( var_is_alpha (v))
307 var_clear_missing_values (var_cont);
308 var_set_short_name (var_cont,
309 cont_var_name (var_get_short_name (v),
311 var_clear_label (var_cont);
315 if ( wcount >= MIN_VERY_LONG_STRING )
317 var_set_width (var_cont, MIN_VERY_LONG_STRING - 1);
318 wcount -= EFFECTIVE_LONG_STRING_LENGTH;
322 var_set_width (var_cont, wcount);
323 wcount -= var_get_width (var_cont);
327 write_variable (w, var_cont);
328 var_destroy (var_cont);
332 /* Write out value labels. */
333 for (idx = i = 0; i < dict_get_var_cnt (d); i++)
335 struct variable *v = dict_get_var (d, i);
337 write_value_labels (w, v, idx);
338 idx += var_flt64_cnt (v);
341 if (dict_get_documents (d) != NULL)
342 write_documents (w, d);
346 write_variable_display_parameters (w, d);
348 if (opts.version >= 3)
349 write_longvar_table (w, d);
351 write_vls_length_table(w, d);
353 /* Write end-of-headers record. */
359 } ATTRIBUTE((packed))
362 rec_999.rec_type = 999;
365 buf_write (w, &rec_999, sizeof rec_999);
370 w->buf = xnmalloc (128, sizeof *w->buf);
372 w->end = &w->buf[128];
373 w->x = (unsigned char *) w->ptr++;
374 w->y = (unsigned char *) w->ptr;
377 if (sfm_write_error (w))
383 sfm_close_writer (w);
387 msg (ME, _("Error opening \"%s\" for writing as a system file: %s."),
388 fh_get_file_name (fh), strerror (errno));
392 /* Returns value of X truncated to two least-significant digits. */
403 /* Write the sysfile_header header to system file W. */
405 write_header (struct sfm_writer *w, const struct dictionary *d)
407 struct sysfile_header hdr;
413 memcpy (hdr.rec_type, "$FL2", 4);
415 p = stpcpy (hdr.prod_name, "@(#) SPSS DATA FILE ");
416 p = append_string_max (p, version, &hdr.prod_name[60]);
417 p = append_string_max (p, " - ", &hdr.prod_name[60]);
418 p = append_string_max (p, host_system, &hdr.prod_name[60]);
419 memset (p, ' ', &hdr.prod_name[60] - p);
424 for (i = 0; i < dict_get_var_cnt (d); i++)
426 w->flt64_cnt += var_flt64_cnt (dict_get_var (d, i));
428 hdr.nominal_case_size = w->flt64_cnt;
430 hdr.compress = w->compress;
432 if (dict_get_weight (d) != NULL)
434 const struct variable *weight_var;
435 int recalc_weight_idx = 1;
438 weight_var = dict_get_weight (d);
441 struct variable *v = dict_get_var (d, i);
444 recalc_weight_idx += var_flt64_cnt (v);
446 hdr.weight_idx = recalc_weight_idx;
452 hdr.bias = COMPRESSION_BIAS;
454 if (time (&t) == (time_t) -1)
456 memcpy (hdr.creation_date, "01 Jan 70", 9);
457 memcpy (hdr.creation_time, "00:00:00", 8);
461 static const char *month_name[12] =
463 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
464 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
466 struct tm *tmp = localtime (&t);
467 int day = rerange (tmp->tm_mday);
468 int mon = rerange (tmp->tm_mon + 1);
469 int year = rerange (tmp->tm_year);
470 int hour = rerange (tmp->tm_hour + 1);
471 int min = rerange (tmp->tm_min + 1);
472 int sec = rerange (tmp->tm_sec + 1);
475 sprintf (buf, "%02d %s %02d", day, month_name[mon - 1], year);
476 memcpy (hdr.creation_date, buf, sizeof hdr.creation_date);
477 sprintf (buf, "%02d:%02d:%02d", hour - 1, min - 1, sec - 1);
478 memcpy (hdr.creation_time, buf, sizeof hdr.creation_time);
482 const char *label = dict_get_label (d);
486 buf_copy_str_rpad (hdr.file_label, sizeof hdr.file_label, label);
489 memset (hdr.padding, 0, sizeof hdr.padding);
491 buf_write (w, &hdr, sizeof hdr);
494 /* Translates format spec from internal form in SRC to system file
497 write_format_spec (const struct fmt_spec *src, int32_t *dest)
499 assert (fmt_check_output (src));
500 *dest = (fmt_to_io (src->type) << 16) | (src->w << 8) | src->d;
503 /* Write the variable record(s) for primary variable P and secondary
504 variable S to system file W. */
506 write_variable (struct sfm_writer *w, const struct variable *v)
508 struct sysfile_variable sv;
510 /* Missing values. */
511 struct missing_values mv;
512 flt64 m[3]; /* Missing value values. */
513 int nm; /* Number of missing values, possibly negative. */
514 const char *label = var_get_label (v);
517 sv.type = MIN (var_get_width (v), MIN_VERY_LONG_STRING - 1);
518 sv.has_var_label = label != NULL;
520 mv_copy (&mv, var_get_missing_values (v));
522 if (mv_has_range (&mv))
525 mv_pop_range (&mv, &x, &y);
526 m[nm++] = x == LOWEST ? second_lowest_flt64 : x;
527 m[nm++] = y == HIGHEST ? FLT64_MAX : y;
529 while (mv_has_value (&mv))
532 mv_pop_value (&mv, &value);
533 if (var_is_numeric (v))
536 buf_copy_rpad ((char *) &m[nm], sizeof m[nm], value.s,
540 if (mv_has_range (var_get_missing_values (v)))
543 sv.n_missing_values = nm;
544 write_format_spec (var_get_print_format (v), &sv.print);
545 write_format_spec (var_get_write_format (v), &sv.write);
546 buf_copy_str_rpad (sv.name, sizeof sv.name, var_get_short_name (v));
547 buf_write (w, &sv, sizeof sv);
555 } ATTRIBUTE((packed))
560 l.label_len = MIN (strlen (label), 255);
561 ext_len = ROUND_UP (l.label_len, sizeof l.label_len);
562 memcpy (l.label, label, l.label_len);
563 memset (&l.label[l.label_len], ' ', ext_len - l.label_len);
565 buf_write (w, &l, offsetof (struct label, label) + ext_len);
569 buf_write (w, m, sizeof *m * abs (nm));
571 if (var_is_alpha (v) && var_get_width (v) > (int) sizeof (flt64))
577 sv.has_var_label = 0;
578 sv.n_missing_values = 0;
579 memset (&sv.print, 0, sizeof sv.print);
580 memset (&sv.write, 0, sizeof sv.write);
581 memset (&sv.name, 0, sizeof sv.name);
583 pad_count = DIV_RND_UP (MIN(var_get_width (v), MIN_VERY_LONG_STRING - 1),
584 (int) sizeof (flt64)) - 1;
585 for (i = 0; i < pad_count; i++)
586 buf_write (w, &sv, sizeof sv);
590 /* Writes the value labels for variable V having system file
591 variable index IDX to system file W. */
593 write_value_labels (struct sfm_writer *w, struct variable *v, int idx)
595 struct value_label_rec
600 } ATTRIBUTE((packed));
607 } ATTRIBUTE((packed));
609 const struct val_labs *val_labs;
610 struct val_labs_iterator *i;
611 struct value_label_rec *vlr;
612 struct var_idx_rec vir;
617 val_labs = var_get_value_labels (v);
618 if (val_labs == NULL)
621 /* Pass 1: Count bytes. */
622 vlr_size = (sizeof (struct value_label_rec)
623 + sizeof (flt64) * (val_labs_count (val_labs) - 1));
624 for (vl = val_labs_first (val_labs, &i); vl != NULL;
625 vl = val_labs_next (val_labs, &i))
626 vlr_size += ROUND_UP (strlen (vl->label) + 1, sizeof (flt64));
628 /* Pass 2: Copy bytes. */
629 vlr = xmalloc (vlr_size);
631 vlr->n_labels = val_labs_count (val_labs);
633 for (vl = val_labs_first_sorted (val_labs, &i); vl != NULL;
634 vl = val_labs_next (val_labs, &i))
636 size_t len = strlen (vl->label);
638 *loc++ = vl->value.f;
639 *(unsigned char *) loc = len;
640 memcpy (&((char *) loc)[1], vl->label, len);
641 memset (&((char *) loc)[1 + len], ' ',
642 REM_RND_UP (len + 1, sizeof (flt64)));
643 loc += DIV_RND_UP (len + 1, sizeof (flt64));
646 buf_write (w, vlr, vlr_size);
651 vir.vars[0] = idx + 1;
652 buf_write (w, &vir, sizeof vir);
655 /* Writes record type 6, document record. */
657 write_documents (struct sfm_writer *w, const struct dictionary *d)
661 int32_t rec_type ; /* Always 6. */
662 int32_t n_lines ; /* Number of lines of documents. */
663 } ATTRIBUTE((packed)) rec_6;
665 const char *documents;
668 documents = dict_get_documents (d);
669 n_lines = strlen (documents) / 80;
672 rec_6.n_lines = n_lines;
673 buf_write (w, &rec_6, sizeof rec_6);
674 buf_write (w, documents, 80 * n_lines);
677 /* Write the alignment, width and scale values */
679 write_variable_display_parameters (struct sfm_writer *w,
680 const struct dictionary *dict)
690 } ATTRIBUTE((packed)) vdp_hdr;
692 vdp_hdr.rec_type = 7;
693 vdp_hdr.subtype = 11;
694 vdp_hdr.elem_size = 4;
695 vdp_hdr.n_elem = w->var_cnt_vls * 3;
697 buf_write (w, &vdp_hdr, sizeof vdp_hdr);
699 for ( i = 0 ; i < w->var_cnt ; ++i )
707 } ATTRIBUTE((packed)) params;
709 v = dict_get_var(dict, i);
711 params.measure = (var_get_measure (v) == MEASURE_NOMINAL ? 1
712 : var_get_measure (v) == MEASURE_ORDINAL ? 2
714 params.width = var_get_display_width (v);
715 params.align = (var_get_alignment (v) == ALIGN_LEFT ? 0
716 : var_get_alignment (v) == ALIGN_RIGHT ? 1
719 buf_write (w, ¶ms, sizeof(params));
721 if (var_is_long_string (v))
723 int wcount = var_get_width (v) - EFFECTIVE_LONG_STRING_LENGTH ;
727 params.width = wcount >= MIN_VERY_LONG_STRING ? 32 : wcount;
729 buf_write (w, ¶ms, sizeof(params));
731 wcount -= EFFECTIVE_LONG_STRING_LENGTH ;
737 /* Writes the table of lengths for Very Long String Variables */
739 write_vls_length_table (struct sfm_writer *w,
740 const struct dictionary *dict)
749 } ATTRIBUTE((packed)) vls_hdr;
751 struct string vls_length_map;
753 ds_init_empty (&vls_length_map);
755 vls_hdr.rec_type = 7;
756 vls_hdr.subtype = 14;
757 vls_hdr.elem_size = 1;
760 for (i = 0; i < dict_get_var_cnt (dict); ++i)
762 const struct variable *v = dict_get_var (dict, i);
764 if ( var_get_width (v) < MIN_VERY_LONG_STRING )
767 ds_put_format (&vls_length_map, "%s=%05d",
768 var_get_short_name (v), var_get_width (v));
769 ds_put_char (&vls_length_map, '\0');
770 ds_put_char (&vls_length_map, '\t');
773 vls_hdr.n_elem = ds_length (&vls_length_map);
775 if ( vls_hdr.n_elem > 0 )
777 buf_write (w, &vls_hdr, sizeof vls_hdr);
778 buf_write (w, ds_data (&vls_length_map), ds_length (&vls_length_map));
781 ds_destroy (&vls_length_map);
784 /* Writes the long variable name table */
786 write_longvar_table (struct sfm_writer *w, const struct dictionary *dict)
794 } ATTRIBUTE((packed)) lv_hdr;
796 struct string long_name_map;
799 ds_init_empty (&long_name_map);
800 for (i = 0; i < dict_get_var_cnt (dict); i++)
802 struct variable *v = dict_get_var (dict, i);
805 ds_put_char (&long_name_map, '\t');
806 ds_put_format (&long_name_map, "%s=%s",
807 var_get_short_name (v), var_get_name (v));
812 lv_hdr.elem_size = 1;
813 lv_hdr.n_elem = ds_length (&long_name_map);
815 buf_write (w, &lv_hdr, sizeof lv_hdr);
816 buf_write (w, ds_data (&long_name_map), ds_length (&long_name_map));
818 ds_destroy (&long_name_map);
821 /* Writes record type 7, subtypes 3 and 4. */
823 write_rec_7_34 (struct sfm_writer *w)
829 int32_t data_type_3 ;
834 int32_t data_type_4 ;
837 } ATTRIBUTE((packed)) rec_7;
839 /* Components of the version number, from major to minor. */
840 int version_component[3];
842 /* Used to step through the version string. */
845 /* Parses the version string, which is assumed to be of the form
846 #.#x, where each # is a string of digits, and x is a single
848 version_component[0] = strtol (bare_version, &p, 10);
851 version_component[1] = strtol (bare_version, &p, 10);
852 version_component[2] = (isalpha ((unsigned char) *p)
853 ? tolower ((unsigned char) *p) - 'a' : 0);
855 rec_7.rec_type_3 = 7;
857 rec_7.data_type_3 = sizeof (int32_t);
859 rec_7.elem_3[0] = version_component[0];
860 rec_7.elem_3[1] = version_component[1];
861 rec_7.elem_3[2] = version_component[2];
862 rec_7.elem_3[3] = -1;
864 /* PORTME: 1=IEEE754, 2=IBM 370, 3=DEC VAX E. */
871 /* PORTME: 1=big-endian, 2=little-endian. */
878 /* PORTME: 1=EBCDIC, 2=7-bit ASCII, 3=8-bit ASCII, 4=DEC Kanji. */
881 rec_7.rec_type_4 = 7;
883 rec_7.data_type_4 = sizeof (flt64);
885 rec_7.elem_4[0] = -FLT64_MAX;
886 rec_7.elem_4[1] = FLT64_MAX;
887 rec_7.elem_4[2] = second_lowest_flt64;
889 buf_write (w, &rec_7, sizeof rec_7);
892 /* Write NBYTES starting at BUF to the system file represented by
895 buf_write (struct sfm_writer *w, const void *buf, size_t nbytes)
897 assert (buf != NULL);
898 fwrite (buf, nbytes, 1, w->file);
901 /* Copies string DEST to SRC with the proviso that DEST does not reach
902 byte END; no null terminator is copied. Returns a pointer to the
903 byte after the last byte copied. */
905 append_string_max (char *dest, const char *src, const char *end)
907 int nbytes = MIN (end - dest, (int) strlen (src));
908 memcpy (dest, src, nbytes);
909 return dest + nbytes;
912 /* Makes certain that the compression buffer of H has room for another
913 element. If there's not room, pads out the current instruction
914 octet with zero and dumps out the buffer. */
916 ensure_buf_space (struct sfm_writer *w)
918 if (w->ptr >= w->end)
920 memset (w->x, 0, w->y - w->x);
923 buf_write (w, w->buf, sizeof *w->buf * 128);
927 static void write_compressed_data (struct sfm_writer *w, const flt64 *elem);
929 /* Writes case C to system file W.
930 Returns 1 if successful, 0 if an I/O error occurred. */
932 sfm_write_case (struct sfm_writer *w, const struct ccase *c)
934 if (ferror (w->file))
939 if (!w->needs_translation && !w->compress
940 && sizeof (flt64) == sizeof (union value) && ! w->has_vls )
942 /* Fast path: external and internal representations are the
943 same and the dictionary is properly ordered. Write
945 buf_write (w, case_data_all (c), sizeof (union value) * w->flt64_cnt);
949 /* Slow path: internal and external representations differ.
950 Write into a bounce buffer, then write to W. */
957 bounce_size = sizeof *bounce * w->flt64_cnt;
958 bounce = bounce_cur = local_alloc (bounce_size);
959 bounce_end = bounce + bounce_size;
961 for (i = 0; i < w->var_cnt; i++)
963 struct sfm_var *v = &w->vars[i];
965 memset(bounce_cur, ' ', v->flt64_cnt * sizeof (flt64));
969 *bounce_cur = case_num_idx (c, v->fv);
970 bounce_cur += v->flt64_cnt;
974 while (ofs < v->width)
976 int chunk = MIN (MIN_VERY_LONG_STRING - 1, v->width - ofs);
977 int nv = DIV_RND_UP (chunk, sizeof (flt64));
978 buf_copy_rpad ((char *) bounce_cur, nv * sizeof (flt64),
979 case_data_idx (c, v->fv)->s + ofs, chunk);
988 buf_write (w, bounce, bounce_size);
990 write_compressed_data (w, bounce);
995 return !sfm_write_error (w);
999 put_instruction (struct sfm_writer *w, unsigned char instruction)
1003 ensure_buf_space (w);
1004 w->x = (unsigned char *) w->ptr++;
1005 w->y = (unsigned char *) w->ptr;
1007 *w->x++ = instruction;
1011 put_element (struct sfm_writer *w, const flt64 *elem)
1013 ensure_buf_space (w);
1014 memcpy (w->ptr++, elem, sizeof *elem);
1018 write_compressed_data (struct sfm_writer *w, const flt64 *elem)
1022 for (i = 0; i < w->var_cnt; i++)
1024 struct sfm_var *v = &w->vars[i];
1028 if (*elem == -FLT64_MAX)
1029 put_instruction (w, 255);
1030 else if (*elem >= 1 - COMPRESSION_BIAS
1031 && *elem <= 251 - COMPRESSION_BIAS
1032 && *elem == (int) *elem)
1033 put_instruction (w, (int) *elem + COMPRESSION_BIAS);
1036 put_instruction (w, 253);
1037 put_element (w, elem);
1045 for (j = 0; j < v->flt64_cnt; j++, elem++)
1047 if (!memcmp (elem, " ", sizeof (flt64)))
1048 put_instruction (w, 254);
1051 put_instruction (w, 253);
1052 put_element (w, elem);
1059 /* Returns true if an I/O error has occurred on WRITER, false otherwise. */
1061 sfm_write_error (const struct sfm_writer *writer)
1063 return ferror (writer->file);
1066 /* Closes a system file after we're done with it.
1067 Returns true if successful, false if an I/O error occurred. */
1069 sfm_close_writer (struct sfm_writer *w)
1077 if (w->file != NULL)
1080 if (w->buf != NULL && w->ptr > w->buf)
1082 memset (w->x, 0, w->y - w->x);
1083 buf_write (w, w->buf, (w->ptr - w->buf) * sizeof *w->buf);
1087 ok = !sfm_write_error (w);
1089 /* Seek back to the beginning and update the number of cases.
1090 This is just a courtesy to later readers, so there's no need
1091 to check return values or report errors. */
1092 if (ok && !fseek (w->file, offsetof (struct sysfile_header, case_cnt),
1095 int32_t case_cnt = w->case_cnt;
1096 fwrite (&case_cnt, sizeof case_cnt, 1, w->file);
1100 if (fclose (w->file) == EOF)
1104 msg (ME, _("An I/O error occurred writing system file \"%s\"."),
1105 fh_get_file_name (w->fh));
1108 fh_close (w->fh, "system file", "we");