1 /* PSPP - computes sample statistics.
2 Copyright (C) 1997-9, 2000, 2006 Free Software Foundation, Inc.
3 Written by Ben Pfaff <blp@gnu.org>.
5 This program is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 This program is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
22 #include "sys-file-writer.h"
23 #include "sys-file-private.h"
33 #include <libpspp/alloc.h>
34 #include <libpspp/hash.h>
35 #include <libpspp/magic.h>
36 #include <libpspp/message.h>
37 #include <libpspp/misc.h>
38 #include <libpspp/str.h>
39 #include <libpspp/version.h>
42 #include "dictionary.h"
43 #include "file-handle-def.h"
45 #include "missing-values.h"
47 #include "value-labels.h"
50 #include "stat-macros.h"
54 #define _(msgid) gettext (msgid)
56 /* Find 64-bit floating-point type. */
59 #define FLT64_MAX FLT_MAX
60 #elif SIZEOF_DOUBLE == 8
62 #define FLT64_MAX DBL_MAX
63 #elif SIZEOF_LONG_DOUBLE == 8
64 #define flt64 long double
65 #define FLT64_MAX LDBL_MAX
67 #error Which one of your basic types is 64-bit floating point?
70 /* Figure out SYSMIS value for flt64. */
71 #include <libpspp/magic.h>
72 #if SIZEOF_DOUBLE == 8
73 #define second_lowest_flt64 second_lowest_value
75 #error Must define second_lowest_flt64 for your architecture.
78 /* Record Type 1: General Information. */
81 char rec_type[4] ; /* 00: Record-type code, "$FL2". */
82 char prod_name[60] ; /* 04: Product identification. */
83 int32_t layout_code ; /* 40: 2. */
84 int32_t nominal_case_size ; /* 44: Number of `value's per case.
85 Note: some systems set this to -1 */
86 int32_t compress ; /* 48: 1=compressed, 0=not compressed. */
87 int32_t weight_idx ; /* 4c: 1-based index of weighting var, or 0. */
88 int32_t case_cnt ; /* 50: Number of cases, -1 if unknown. */
89 flt64 bias ; /* 54: Compression bias (100.0). */
90 char creation_date[9] ; /* 5c: `dd mmm yy' creation date of file. */
91 char creation_time[8] ; /* 65: `hh:mm:ss' 24-hour creation time. */
92 char file_label[64] ; /* 6d: File label. */
93 char padding[3] ; /* ad: Ignored padding. */
94 } ATTRIBUTE((packed)) ;
96 /* Record Type 2: Variable. */
97 struct sysfile_variable
99 int32_t rec_type ; /* 2. */
100 int32_t type ; /* 0=numeric, 1-255=string width,
101 -1=continued string. */
102 int32_t has_var_label ; /* 1=has a variable label, 0=doesn't. */
103 int32_t n_missing_values ; /* Missing value code of -3,-2,0,1,2, or 3. */
104 int32_t print ; /* Print format. */
105 int32_t write ; /* Write format. */
106 char name[SHORT_NAME_LEN] ; /* Variable name. */
107 /* The rest of the structure varies. */
108 } ATTRIBUTE((packed)) ;
110 /* Compression bias used by PSPP. Values between (1 -
111 COMPRESSION_BIAS) and (251 - COMPRESSION_BIAS) inclusive can be
113 #define COMPRESSION_BIAS 100
115 /* System file writer. */
118 struct file_handle *fh; /* File handle. */
119 FILE *file; /* File stream. */
121 int needs_translation; /* 0=use fast path, 1=translation needed. */
122 int compress; /* 1=compressed, 0=not compressed. */
123 int case_cnt; /* Number of cases written so far. */
124 size_t flt64_cnt; /* Number of flt64 elements in case. */
125 bool has_vls; /* Does the dict have very long strings? */
127 /* Compression buffering. */
128 flt64 *buf; /* Buffered data. */
129 flt64 *end; /* Buffer end. */
130 flt64 *ptr; /* Current location in buffer. */
131 unsigned char *x; /* Location in current instruction octet. */
132 unsigned char *y; /* End of instruction octet. */
135 struct sfm_var *vars; /* Variables. */
136 size_t var_cnt; /* Number of variables. */
137 size_t var_cnt_vls; /* Number of variables including
138 very long string components. */
141 /* A variable in a system file. */
144 int width; /* 0=numeric, otherwise string width. */
145 int fv; /* Index into case. */
146 size_t flt64_cnt; /* Number of flt64 elements. */
149 static char *append_string_max (char *, const char *, const char *);
150 static void write_header (struct sfm_writer *, const struct dictionary *);
151 static void buf_write (struct sfm_writer *, const void *, size_t);
152 static void write_variable (struct sfm_writer *, const struct variable *);
153 static void write_value_labels (struct sfm_writer *,
154 struct variable *, int idx);
155 static void write_rec_7_34 (struct sfm_writer *);
157 static void write_longvar_table (struct sfm_writer *w,
158 const struct dictionary *dict);
160 static void write_vls_length_table (struct sfm_writer *w,
161 const struct dictionary *dict);
164 static void write_variable_display_parameters (struct sfm_writer *w,
165 const struct dictionary *dict);
167 static void write_documents (struct sfm_writer *, const struct dictionary *);
170 var_flt64_cnt (const struct variable *v)
172 assert(sizeof(flt64) == MAX_SHORT_STRING);
173 return sfm_width_to_bytes(var_get_width (v)) / MAX_SHORT_STRING ;
177 var_flt64_cnt_nom (const struct variable *v)
179 return (var_is_numeric (v)
180 ? 1 : DIV_RND_UP (var_get_width (v), sizeof (flt64)));
184 /* Returns default options for writing a system file. */
185 struct sfm_write_options
186 sfm_writer_default_options (void)
188 struct sfm_write_options opts;
189 opts.create_writeable = true;
190 opts.compress = get_scompression ();
196 /* Return a short variable name to be used as the continuation of the
197 variable with the short name SN.
199 FIXME: Need to resolve clashes somehow.
203 cont_var_name(const char *sn, int idx)
205 static char s[SHORT_NAME_LEN + 1];
207 char abb[SHORT_NAME_LEN + 1 - 3]= {0};
209 strncpy(abb, sn, SHORT_NAME_LEN - 3);
211 snprintf(s, SHORT_NAME_LEN + 1, "%s%03d", abb, idx);
217 /* Opens the system file designated by file handle FH for writing
218 cases from dictionary D according to the given OPTS. If
219 COMPRESS is nonzero, the system file will be compressed.
221 No reference to D is retained, so it may be modified or
222 destroyed at will after this function returns. D is not
223 modified by this function, except to assign short names. */
225 sfm_open_writer (struct file_handle *fh, struct dictionary *d,
226 struct sfm_write_options opts)
228 struct sfm_writer *w = NULL;
235 if (opts.version != 2 && opts.version != 3)
237 msg (ME, _("Unknown system file version %d. Treating as version %d."),
243 mode = S_IRUSR | S_IRGRP | S_IROTH;
244 if (opts.create_writeable)
245 mode |= S_IWUSR | S_IWGRP | S_IWOTH;
246 fd = open (fh_get_file_name (fh), O_WRONLY | O_CREAT | O_TRUNC, mode);
250 /* Open file handle. */
251 if (!fh_open (fh, FH_REF_FILE, "system file", "we"))
254 /* Create and initialize writer. */
255 w = xmalloc (sizeof *w);
257 w->file = fdopen (fd, "w");
259 w->needs_translation = dict_compacting_would_change (d);
260 w->compress = opts.compress;
265 w->buf = w->end = w->ptr = NULL;
268 w->var_cnt = dict_get_var_cnt (d);
269 w->var_cnt_vls = w->var_cnt;
270 w->vars = xnmalloc (w->var_cnt, sizeof *w->vars);
271 for (i = 0; i < w->var_cnt; i++)
273 const struct variable *dv = dict_get_var (d, i);
274 struct sfm_var *sv = &w->vars[i];
275 sv->width = var_get_width (dv);
276 /* spss compatibility nonsense */
277 if ( var_get_width (dv) >= MIN_VERY_LONG_STRING )
280 sv->fv = var_get_case_index (dv);
281 sv->flt64_cnt = var_flt64_cnt (dv);
284 /* Check that file create succeeded. */
291 /* Write the file header. */
294 /* Write basic variable info. */
295 dict_assign_short_names (d);
296 for (i = 0; i < dict_get_var_cnt (d); i++)
299 const struct variable *v = dict_get_var(d, i);
300 int wcount = var_get_width (v);
303 struct variable *var_cont = var_clone (v);
304 var_set_short_name (var_cont, var_get_short_name (v));
305 if ( var_is_alpha (v))
309 var_clear_missing_values (var_cont);
310 var_set_short_name (var_cont,
311 cont_var_name (var_get_short_name (v),
313 var_clear_label (var_cont);
317 if ( wcount >= MIN_VERY_LONG_STRING )
319 var_set_width (var_cont, MIN_VERY_LONG_STRING - 1);
320 wcount -= EFFECTIVE_LONG_STRING_LENGTH;
324 var_set_width (var_cont, wcount);
325 wcount -= var_get_width (var_cont);
329 write_variable (w, var_cont);
330 var_destroy (var_cont);
334 /* Write out value labels. */
335 for (idx = i = 0; i < dict_get_var_cnt (d); i++)
337 struct variable *v = dict_get_var (d, i);
339 write_value_labels (w, v, idx);
340 idx += var_flt64_cnt (v);
343 if (dict_get_documents (d) != NULL)
344 write_documents (w, d);
348 write_variable_display_parameters (w, d);
350 if (opts.version >= 3)
351 write_longvar_table (w, d);
353 write_vls_length_table(w, d);
355 /* Write end-of-headers record. */
361 } ATTRIBUTE((packed))
364 rec_999.rec_type = 999;
367 buf_write (w, &rec_999, sizeof rec_999);
372 w->buf = xnmalloc (128, sizeof *w->buf);
374 w->end = &w->buf[128];
375 w->x = (unsigned char *) w->ptr++;
376 w->y = (unsigned char *) w->ptr;
379 if (sfm_write_error (w))
385 sfm_close_writer (w);
389 msg (ME, _("Error opening \"%s\" for writing as a system file: %s."),
390 fh_get_file_name (fh), strerror (errno));
394 /* Returns value of X truncated to two least-significant digits. */
405 /* Write the sysfile_header header to system file W. */
407 write_header (struct sfm_writer *w, const struct dictionary *d)
409 struct sysfile_header hdr;
415 memcpy (hdr.rec_type, "$FL2", 4);
417 p = stpcpy (hdr.prod_name, "@(#) SPSS DATA FILE ");
418 p = append_string_max (p, version, &hdr.prod_name[60]);
419 p = append_string_max (p, " - ", &hdr.prod_name[60]);
420 p = append_string_max (p, host_system, &hdr.prod_name[60]);
421 memset (p, ' ', &hdr.prod_name[60] - p);
426 for (i = 0; i < dict_get_var_cnt (d); i++)
428 w->flt64_cnt += var_flt64_cnt (dict_get_var (d, i));
430 hdr.nominal_case_size = w->flt64_cnt;
432 hdr.compress = w->compress;
434 if (dict_get_weight (d) != NULL)
436 const struct variable *weight_var;
437 int recalc_weight_idx = 1;
440 weight_var = dict_get_weight (d);
443 struct variable *v = dict_get_var (d, i);
446 recalc_weight_idx += var_flt64_cnt (v);
448 hdr.weight_idx = recalc_weight_idx;
454 hdr.bias = COMPRESSION_BIAS;
456 if (time (&t) == (time_t) -1)
458 memcpy (hdr.creation_date, "01 Jan 70", 9);
459 memcpy (hdr.creation_time, "00:00:00", 8);
463 static const char *month_name[12] =
465 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
466 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
468 struct tm *tmp = localtime (&t);
469 int day = rerange (tmp->tm_mday);
470 int mon = rerange (tmp->tm_mon + 1);
471 int year = rerange (tmp->tm_year);
472 int hour = rerange (tmp->tm_hour + 1);
473 int min = rerange (tmp->tm_min + 1);
474 int sec = rerange (tmp->tm_sec + 1);
477 sprintf (buf, "%02d %s %02d", day, month_name[mon - 1], year);
478 memcpy (hdr.creation_date, buf, sizeof hdr.creation_date);
479 sprintf (buf, "%02d:%02d:%02d", hour - 1, min - 1, sec - 1);
480 memcpy (hdr.creation_time, buf, sizeof hdr.creation_time);
484 const char *label = dict_get_label (d);
488 buf_copy_str_rpad (hdr.file_label, sizeof hdr.file_label, label);
491 memset (hdr.padding, 0, sizeof hdr.padding);
493 buf_write (w, &hdr, sizeof hdr);
496 /* Translates format spec from internal form in SRC to system file
499 write_format_spec (const struct fmt_spec *src, int32_t *dest)
501 assert (fmt_check_output (src));
502 *dest = (fmt_to_io (src->type) << 16) | (src->w << 8) | src->d;
505 /* Write the variable record(s) for primary variable P and secondary
506 variable S to system file W. */
508 write_variable (struct sfm_writer *w, const struct variable *v)
510 struct sysfile_variable sv;
512 /* Missing values. */
513 struct missing_values mv;
514 flt64 m[3]; /* Missing value values. */
515 int nm; /* Number of missing values, possibly negative. */
516 const char *label = var_get_label (v);
519 sv.type = MIN (var_get_width (v), MIN_VERY_LONG_STRING - 1);
520 sv.has_var_label = label != NULL;
522 mv_copy (&mv, var_get_missing_values (v));
524 if (mv_has_range (&mv))
527 mv_pop_range (&mv, &x, &y);
528 m[nm++] = x == LOWEST ? second_lowest_flt64 : x;
529 m[nm++] = y == HIGHEST ? FLT64_MAX : y;
531 while (mv_has_value (&mv))
534 mv_pop_value (&mv, &value);
535 if (var_is_numeric (v))
538 buf_copy_rpad ((char *) &m[nm], sizeof m[nm], value.s,
542 if (mv_has_range (var_get_missing_values (v)))
545 sv.n_missing_values = nm;
546 write_format_spec (var_get_print_format (v), &sv.print);
547 write_format_spec (var_get_write_format (v), &sv.write);
548 buf_copy_str_rpad (sv.name, sizeof sv.name, var_get_short_name (v));
549 buf_write (w, &sv, sizeof sv);
557 } ATTRIBUTE((packed))
562 l.label_len = MIN (strlen (label), 255);
563 ext_len = ROUND_UP (l.label_len, sizeof l.label_len);
564 memcpy (l.label, label, l.label_len);
565 memset (&l.label[l.label_len], ' ', ext_len - l.label_len);
567 buf_write (w, &l, offsetof (struct label, label) + ext_len);
571 buf_write (w, m, sizeof *m * abs (nm));
573 if (var_is_alpha (v) && var_get_width (v) > (int) sizeof (flt64))
579 sv.has_var_label = 0;
580 sv.n_missing_values = 0;
581 memset (&sv.print, 0, sizeof sv.print);
582 memset (&sv.write, 0, sizeof sv.write);
583 memset (&sv.name, 0, sizeof sv.name);
585 pad_count = DIV_RND_UP (MIN(var_get_width (v), MIN_VERY_LONG_STRING - 1),
586 (int) sizeof (flt64)) - 1;
587 for (i = 0; i < pad_count; i++)
588 buf_write (w, &sv, sizeof sv);
592 /* Writes the value labels for variable V having system file
593 variable index IDX to system file W. */
595 write_value_labels (struct sfm_writer *w, struct variable *v, int idx)
597 struct value_label_rec
602 } ATTRIBUTE((packed));
609 } ATTRIBUTE((packed));
611 const struct val_labs *val_labs;
612 struct val_labs_iterator *i;
613 struct value_label_rec *vlr;
614 struct var_idx_rec vir;
619 val_labs = var_get_value_labels (v);
620 if (val_labs == NULL)
623 /* Pass 1: Count bytes. */
624 vlr_size = (sizeof (struct value_label_rec)
625 + sizeof (flt64) * (val_labs_count (val_labs) - 1));
626 for (vl = val_labs_first (val_labs, &i); vl != NULL;
627 vl = val_labs_next (val_labs, &i))
628 vlr_size += ROUND_UP (strlen (vl->label) + 1, sizeof (flt64));
630 /* Pass 2: Copy bytes. */
631 vlr = xmalloc (vlr_size);
633 vlr->n_labels = val_labs_count (val_labs);
635 for (vl = val_labs_first_sorted (val_labs, &i); vl != NULL;
636 vl = val_labs_next (val_labs, &i))
638 size_t len = strlen (vl->label);
640 *loc++ = vl->value.f;
641 *(unsigned char *) loc = len;
642 memcpy (&((char *) loc)[1], vl->label, len);
643 memset (&((char *) loc)[1 + len], ' ',
644 REM_RND_UP (len + 1, sizeof (flt64)));
645 loc += DIV_RND_UP (len + 1, sizeof (flt64));
648 buf_write (w, vlr, vlr_size);
653 vir.vars[0] = idx + 1;
654 buf_write (w, &vir, sizeof vir);
657 /* Writes record type 6, document record. */
659 write_documents (struct sfm_writer *w, const struct dictionary *d)
663 int32_t rec_type ; /* Always 6. */
664 int32_t n_lines ; /* Number of lines of documents. */
665 } ATTRIBUTE((packed)) rec_6;
667 const char *documents;
670 documents = dict_get_documents (d);
671 n_lines = strlen (documents) / 80;
674 rec_6.n_lines = n_lines;
675 buf_write (w, &rec_6, sizeof rec_6);
676 buf_write (w, documents, 80 * n_lines);
679 /* Write the alignment, width and scale values */
681 write_variable_display_parameters (struct sfm_writer *w,
682 const struct dictionary *dict)
692 } ATTRIBUTE((packed)) vdp_hdr;
694 vdp_hdr.rec_type = 7;
695 vdp_hdr.subtype = 11;
696 vdp_hdr.elem_size = 4;
697 vdp_hdr.n_elem = w->var_cnt_vls * 3;
699 buf_write (w, &vdp_hdr, sizeof vdp_hdr);
701 for ( i = 0 ; i < w->var_cnt ; ++i )
709 } ATTRIBUTE((packed)) params;
711 v = dict_get_var(dict, i);
713 params.measure = var_get_measure (v);
714 params.width = var_get_display_width (v);
715 params.align = var_get_alignment (v);
717 buf_write (w, ¶ms, sizeof(params));
719 if (var_is_long_string (v))
721 int wcount = var_get_width (v) - EFFECTIVE_LONG_STRING_LENGTH ;
725 params.width = wcount >= MIN_VERY_LONG_STRING ? 32 : wcount;
727 buf_write (w, ¶ms, sizeof(params));
729 wcount -= EFFECTIVE_LONG_STRING_LENGTH ;
735 /* Writes the table of lengths for Very Long String Variables */
737 write_vls_length_table (struct sfm_writer *w,
738 const struct dictionary *dict)
747 } ATTRIBUTE((packed)) vls_hdr;
749 struct string vls_length_map;
751 ds_init_empty (&vls_length_map);
753 vls_hdr.rec_type = 7;
754 vls_hdr.subtype = 14;
755 vls_hdr.elem_size = 1;
758 for (i = 0; i < dict_get_var_cnt (dict); ++i)
760 const struct variable *v = dict_get_var (dict, i);
762 if ( var_get_width (v) < MIN_VERY_LONG_STRING )
765 ds_put_format (&vls_length_map, "%s=%05d",
766 var_get_short_name (v), var_get_width (v));
767 ds_put_char (&vls_length_map, '\0');
768 ds_put_char (&vls_length_map, '\t');
771 vls_hdr.n_elem = ds_length (&vls_length_map);
773 if ( vls_hdr.n_elem > 0 )
775 buf_write (w, &vls_hdr, sizeof vls_hdr);
776 buf_write (w, ds_data (&vls_length_map), ds_length (&vls_length_map));
779 ds_destroy (&vls_length_map);
782 /* Writes the long variable name table */
784 write_longvar_table (struct sfm_writer *w, const struct dictionary *dict)
792 } ATTRIBUTE((packed)) lv_hdr;
794 struct string long_name_map;
797 ds_init_empty (&long_name_map);
798 for (i = 0; i < dict_get_var_cnt (dict); i++)
800 struct variable *v = dict_get_var (dict, i);
803 ds_put_char (&long_name_map, '\t');
804 ds_put_format (&long_name_map, "%s=%s",
805 var_get_short_name (v), var_get_name (v));
810 lv_hdr.elem_size = 1;
811 lv_hdr.n_elem = ds_length (&long_name_map);
813 buf_write (w, &lv_hdr, sizeof lv_hdr);
814 buf_write (w, ds_data (&long_name_map), ds_length (&long_name_map));
816 ds_destroy (&long_name_map);
819 /* Writes record type 7, subtypes 3 and 4. */
821 write_rec_7_34 (struct sfm_writer *w)
827 int32_t data_type_3 ;
832 int32_t data_type_4 ;
835 } ATTRIBUTE((packed)) rec_7;
837 /* Components of the version number, from major to minor. */
838 int version_component[3];
840 /* Used to step through the version string. */
843 /* Parses the version string, which is assumed to be of the form
844 #.#x, where each # is a string of digits, and x is a single
846 version_component[0] = strtol (bare_version, &p, 10);
849 version_component[1] = strtol (bare_version, &p, 10);
850 version_component[2] = (isalpha ((unsigned char) *p)
851 ? tolower ((unsigned char) *p) - 'a' : 0);
853 rec_7.rec_type_3 = 7;
855 rec_7.data_type_3 = sizeof (int32_t);
857 rec_7.elem_3[0] = version_component[0];
858 rec_7.elem_3[1] = version_component[1];
859 rec_7.elem_3[2] = version_component[2];
860 rec_7.elem_3[3] = -1;
862 /* PORTME: 1=IEEE754, 2=IBM 370, 3=DEC VAX E. */
869 /* PORTME: 1=big-endian, 2=little-endian. */
876 /* PORTME: 1=EBCDIC, 2=7-bit ASCII, 3=8-bit ASCII, 4=DEC Kanji. */
879 rec_7.rec_type_4 = 7;
881 rec_7.data_type_4 = sizeof (flt64);
883 rec_7.elem_4[0] = -FLT64_MAX;
884 rec_7.elem_4[1] = FLT64_MAX;
885 rec_7.elem_4[2] = second_lowest_flt64;
887 buf_write (w, &rec_7, sizeof rec_7);
890 /* Write NBYTES starting at BUF to the system file represented by
893 buf_write (struct sfm_writer *w, const void *buf, size_t nbytes)
895 assert (buf != NULL);
896 fwrite (buf, nbytes, 1, w->file);
899 /* Copies string DEST to SRC with the proviso that DEST does not reach
900 byte END; no null terminator is copied. Returns a pointer to the
901 byte after the last byte copied. */
903 append_string_max (char *dest, const char *src, const char *end)
905 int nbytes = MIN (end - dest, (int) strlen (src));
906 memcpy (dest, src, nbytes);
907 return dest + nbytes;
910 /* Makes certain that the compression buffer of H has room for another
911 element. If there's not room, pads out the current instruction
912 octet with zero and dumps out the buffer. */
914 ensure_buf_space (struct sfm_writer *w)
916 if (w->ptr >= w->end)
918 memset (w->x, 0, w->y - w->x);
921 buf_write (w, w->buf, sizeof *w->buf * 128);
925 static void write_compressed_data (struct sfm_writer *w, const flt64 *elem);
927 /* Writes case C to system file W.
928 Returns 1 if successful, 0 if an I/O error occurred. */
930 sfm_write_case (struct sfm_writer *w, const struct ccase *c)
932 if (ferror (w->file))
937 if (!w->needs_translation && !w->compress
938 && sizeof (flt64) == sizeof (union value) && ! w->has_vls )
940 /* Fast path: external and internal representations are the
941 same and the dictionary is properly ordered. Write
943 buf_write (w, case_data_all (c), sizeof (union value) * w->flt64_cnt);
947 /* Slow path: internal and external representations differ.
948 Write into a bounce buffer, then write to W. */
955 bounce_size = sizeof *bounce * w->flt64_cnt;
956 bounce = bounce_cur = local_alloc (bounce_size);
957 bounce_end = bounce + bounce_size;
959 for (i = 0; i < w->var_cnt; i++)
961 struct sfm_var *v = &w->vars[i];
963 memset(bounce_cur, ' ', v->flt64_cnt * sizeof (flt64));
967 *bounce_cur = case_num_idx (c, v->fv);
968 bounce_cur += v->flt64_cnt;
972 while (ofs < v->width)
974 int chunk = MIN (MIN_VERY_LONG_STRING - 1, v->width - ofs);
975 int nv = DIV_RND_UP (chunk, sizeof (flt64));
976 buf_copy_rpad ((char *) bounce_cur, nv * sizeof (flt64),
977 case_data_idx (c, v->fv)->s + ofs, chunk);
986 buf_write (w, bounce, bounce_size);
988 write_compressed_data (w, bounce);
993 return !sfm_write_error (w);
997 put_instruction (struct sfm_writer *w, unsigned char instruction)
1001 ensure_buf_space (w);
1002 w->x = (unsigned char *) w->ptr++;
1003 w->y = (unsigned char *) w->ptr;
1005 *w->x++ = instruction;
1009 put_element (struct sfm_writer *w, const flt64 *elem)
1011 ensure_buf_space (w);
1012 memcpy (w->ptr++, elem, sizeof *elem);
1016 write_compressed_data (struct sfm_writer *w, const flt64 *elem)
1020 for (i = 0; i < w->var_cnt; i++)
1022 struct sfm_var *v = &w->vars[i];
1026 if (*elem == -FLT64_MAX)
1027 put_instruction (w, 255);
1028 else if (*elem >= 1 - COMPRESSION_BIAS
1029 && *elem <= 251 - COMPRESSION_BIAS
1030 && *elem == (int) *elem)
1031 put_instruction (w, (int) *elem + COMPRESSION_BIAS);
1034 put_instruction (w, 253);
1035 put_element (w, elem);
1043 for (j = 0; j < v->flt64_cnt; j++, elem++)
1045 if (!memcmp (elem, " ", sizeof (flt64)))
1046 put_instruction (w, 254);
1049 put_instruction (w, 253);
1050 put_element (w, elem);
1057 /* Returns true if an I/O error has occurred on WRITER, false otherwise. */
1059 sfm_write_error (const struct sfm_writer *writer)
1061 return ferror (writer->file);
1064 /* Closes a system file after we're done with it.
1065 Returns true if successful, false if an I/O error occurred. */
1067 sfm_close_writer (struct sfm_writer *w)
1075 if (w->file != NULL)
1078 if (w->buf != NULL && w->ptr > w->buf)
1080 memset (w->x, 0, w->y - w->x);
1081 buf_write (w, w->buf, (w->ptr - w->buf) * sizeof *w->buf);
1085 ok = !sfm_write_error (w);
1087 /* Seek back to the beginning and update the number of cases.
1088 This is just a courtesy to later readers, so there's no need
1089 to check return values or report errors. */
1090 if (ok && !fseek (w->file, offsetof (struct sysfile_header, case_cnt),
1093 int32_t case_cnt = w->case_cnt;
1094 fwrite (&case_cnt, sizeof case_cnt, 1, w->file);
1098 if (fclose (w->file) == EOF)
1102 msg (ME, _("An I/O error occurred writing system file \"%s\"."),
1103 fh_get_file_name (w->fh));
1106 fh_close (w->fh, "system file", "we");