X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fsfm-read.c;h=986dede94fd2947a62d8a944d1777cf319c688b3;hb=92fb12eb06716d14c05b781f5d9dcde956d77c30;hp=226c8b316f40ec86f54a12e1d5db4c758e58029b;hpb=3417680e253b1bfc4519347ef06536378026be2a;p=pspp diff --git a/src/sfm-read.c b/src/sfm-read.c index 226c8b316f..986dede94f 100644 --- a/src/sfm-read.c +++ b/src/sfm-read.c @@ -1,5 +1,5 @@ /* PSPP - computes sample statistics. - Copyright (C) 1997-9, 2000 Free Software Foundation, Inc. + Copyright (C) 1997-9, 2000, 2006 Free Software Foundation, Inc. Written by Ben Pfaff . This program is free software; you can redistribute it and/or @@ -143,15 +143,17 @@ sfm_close_reader (struct sfm_reader *r) if (r == NULL) return; + if (r->file) + { + if (fn_close (fh_get_filename (r->fh), r->file) == EOF) + msg (ME, _("%s: Closing system file: %s."), + fh_get_filename (r->fh), strerror (errno)); + r->file = NULL; + } + if (r->fh != NULL) fh_close (r->fh, "system file", "rs"); - if ( r->file ) { - if (fn_close (handle_get_filename (r->fh), r->file) == EOF) - msg (ME, _("%s: Closing system file: %s."), - handle_get_filename (r->fh), strerror (errno)); - r->file = NULL; - } free (r->vars); free (r->buf); free (r); @@ -206,13 +208,13 @@ sfm_open_reader (struct file_handle *fh, struct dictionary **dict, struct variable **var_by_idx = NULL; *dict = dict_create (); - if (!fh_open (fh, "system file", "rs")) + if (!fh_open (fh, FH_REF_FILE, "system file", "rs")) goto error; /* Create and initialize reader. */ r = xmalloc (sizeof *r); r->fh = fh; - r->file = fn_open (handle_get_filename (fh), "rb"); + r->file = fn_open (fh_get_filename (fh), "rb"); r->reverse_endian = 0; r->fix_specials = 0; @@ -236,7 +238,7 @@ sfm_open_reader (struct file_handle *fh, struct dictionary **dict, { msg (ME, _("An error occurred while opening \"%s\" for reading " "as a system file: %s."), - handle_get_filename (r->fh), strerror (errno)); + fh_get_filename (r->fh), strerror (errno)); err_cond_fail (); goto error; } @@ -254,7 +256,7 @@ sfm_open_reader (struct file_handle *fh, struct dictionary **dict, if (r->weight_idx < 0 || r->weight_idx >= r->value_cnt) lose ((ME, _("%s: Index of weighting variable (%d) is not between 0 " "and number of elements per case (%d)."), - handle_get_filename (r->fh), r->weight_idx, r->value_cnt)); + fh_get_filename (r->fh), r->weight_idx, r->value_cnt)); weight_var = var_by_idx[r->weight_idx]; @@ -262,10 +264,10 @@ sfm_open_reader (struct file_handle *fh, struct dictionary **dict, if (weight_var == NULL) lose ((ME, _("%s: Weighting variable may not be a continuation of " - "a long string variable."), handle_get_filename (fh))); + "a long string variable."), fh_get_filename (fh))); else if (weight_var->type == ALPHA) lose ((ME, _("%s: Weighting variable may not be a string variable."), - handle_get_filename (fh))); + fh_get_filename (fh))); dict_set_weight (*dict, weight_var); } @@ -292,7 +294,7 @@ sfm_open_reader (struct file_handle *fh, struct dictionary **dict, lose ((ME, _("%s: Orphaned variable index record (type 4). Type 4 " "records must always immediately follow type 3 " "records."), - handle_get_filename (r->fh))); + fh_get_filename (r->fh))); case 6: if (!read_documents (r, *dict)) @@ -322,7 +324,7 @@ sfm_open_reader (struct file_handle *fh, struct dictionary **dict, bytes = data.size * data.count; if (bytes < data.size || bytes < data.count) lose ((ME, "%s: Record type %d subtype %d too large.", - handle_get_filename (r->fh), rec_type, data.subtype)); + fh_get_filename (r->fh), rec_type, data.subtype)); switch (data.subtype) { @@ -349,7 +351,7 @@ sfm_open_reader (struct file_handle *fh, struct dictionary **dict, { msg (MW, _("%s: Invalid subrecord length. " "Record: 7; Subrecord: 11"), - handle_get_filename (r->fh)); + fh_get_filename (r->fh)); skip = 1; } @@ -403,14 +405,14 @@ sfm_open_reader (struct file_handle *fh, struct dictionary **dict, { msg (MW, _("%s: Trailing garbage in long variable " "name map."), - handle_get_filename (r->fh)); + fh_get_filename (r->fh)); break; } if (!var_is_valid_name (long_name, false)) { msg (MW, _("%s: Long variable mapping to invalid " "variable name `%s'."), - handle_get_filename (r->fh), long_name); + fh_get_filename (r->fh), long_name); break; } @@ -420,7 +422,7 @@ sfm_open_reader (struct file_handle *fh, struct dictionary **dict, { msg (MW, _("%s: Long variable mapping for " "nonexistent variable %s."), - handle_get_filename (r->fh), short_name); + fh_get_filename (r->fh), short_name); break; } @@ -430,7 +432,7 @@ sfm_open_reader (struct file_handle *fh, struct dictionary **dict, { lose ((ME, _("%s: Duplicate long variable name `%s' " "within system file."), - handle_get_filename (r->fh), long_name)); + fh_get_filename (r->fh), long_name)); break; } @@ -458,7 +460,7 @@ sfm_open_reader (struct file_handle *fh, struct dictionary **dict, default: msg (MW, _("%s: Unrecognized record type 7, subtype %d " "encountered in system file."), - handle_get_filename (r->fh), data.subtype); + fh_get_filename (r->fh), data.subtype); skip = 1; } @@ -482,7 +484,7 @@ sfm_open_reader (struct file_handle *fh, struct dictionary **dict, default: corrupt_msg(MW, _("%s: Unrecognized record type %d."), - handle_get_filename (r->fh), rec_type); + fh_get_filename (r->fh), rec_type); } } @@ -515,7 +517,7 @@ read_machine_int32_info (struct sfm_reader *r, int size, int count) if (size != sizeof (int32) || count != 8) lose ((ME, _("%s: Bad size (%d) or count (%d) field on record type 7, " "subtype 3. Expected size %d, count 8."), - handle_get_filename (r->fh), size, count, sizeof (int32))); + fh_get_filename (r->fh), size, count, sizeof (int32))); assertive_buf_read (r, data, sizeof data, 0); if (r->reverse_endian) @@ -527,7 +529,7 @@ read_machine_int32_info (struct sfm_reader *r, int size, int count) lose ((ME, _("%s: Floating-point representation in system file is not " "IEEE-754. PSPP cannot convert between floating-point " "formats."), - handle_get_filename (r->fh))); + fh_get_filename (r->fh))); #else #error Add support for your floating-point format. #endif @@ -542,7 +544,7 @@ read_machine_int32_info (struct sfm_reader *r, int size, int count) if (file_bigendian ^ (data[6] == 1)) lose ((ME, _("%s: File-indicated endianness (%s) does not match " "endianness intuited from file header (%s)."), - handle_get_filename (r->fh), + fh_get_filename (r->fh), file_bigendian ? _("big-endian") : _("little-endian"), data[6] == 1 ? _("big-endian") : (data[6] == 2 ? _("little-endian") : _("unknown")))); @@ -551,7 +553,7 @@ read_machine_int32_info (struct sfm_reader *r, int size, int count) if (data[7] != 2 && data[7] != 3) lose ((ME, _("%s: File-indicated character representation code (%s) is " "not ASCII."), - handle_get_filename (r->fh), + fh_get_filename (r->fh), (data[7] == 1 ? "EBCDIC" : (data[7] == 4 ? _("DEC Kanji") : _("Unknown"))))); @@ -571,7 +573,7 @@ read_machine_flt64_info (struct sfm_reader *r, int size, int count) if (size != sizeof (flt64) || count != 3) lose ((ME, _("%s: Bad size (%d) or count (%d) field on record type 7, " "subtype 4. Expected size %d, count 8."), - handle_get_filename (r->fh), size, count, sizeof (flt64))); + fh_get_filename (r->fh), size, count, sizeof (flt64))); assertive_buf_read (r, data, sizeof data, 0); if (r->reverse_endian) @@ -588,7 +590,7 @@ read_machine_flt64_info (struct sfm_reader *r, int size, int count) "for at least one of the three system values. SYSMIS: " "indicated %g, expected %g; HIGHEST: %g, %g; LOWEST: " "%g, %g."), - handle_get_filename (r->fh), (double) data[0], (double) SYSMIS, + fh_get_filename (r->fh), (double) data[0], (double) SYSMIS, (double) data[1], (double) FLT64_MAX, (double) data[2], (double) second_lowest_flt64); } @@ -613,7 +615,7 @@ read_header (struct sfm_reader *r, if (strncmp ("$FL2", hdr.rec_type, 4) != 0) lose ((ME, _("%s: Bad magic. Proper system files begin with " "the four characters `$FL2'. This file will not be read."), - handle_get_filename (r->fh))); + fh_get_filename (r->fh))); /* Check eye-catcher string. */ memcpy (prod_name, hdr.prod_name, sizeof hdr.prod_name); @@ -655,7 +657,7 @@ read_header (struct sfm_reader *r, if (hdr.layout_code != 2) lose ((ME, _("%s: File layout code has unexpected value %d. Value " "should be 2, in big-endian or little-endian format."), - handle_get_filename (r->fh), hdr.layout_code)); + fh_get_filename (r->fh), hdr.layout_code)); r->reverse_endian = 1; bswap_int32 (&hdr.case_size); @@ -682,13 +684,13 @@ read_header (struct sfm_reader *r, if (r->case_cnt < -1 || r->case_cnt > INT_MAX / 2) lose ((ME, _("%s: Number of cases in file (%ld) is not between -1 and %d."), - handle_get_filename (r->fh), (long) r->case_cnt, INT_MAX / 2)); + fh_get_filename (r->fh), (long) r->case_cnt, INT_MAX / 2)); r->bias = hdr.bias; if (r->bias != 100.0) corrupt_msg (MW, _("%s: Compression bias (%g) is not the usual " "value of 100."), - handle_get_filename (r->fh), r->bias); + fh_get_filename (r->fh), r->bias); /* Make a file label only on the condition that the given label is not all spaces or nulls. */ @@ -758,10 +760,10 @@ read_variables (struct sfm_reader *r, *var_by_idx = 0; /* Pre-allocate variables. */ - if ( r->value_cnt != -1 ) + if (r->value_cnt != -1) { - *var_by_idx = xmalloc(r->value_cnt * sizeof (**var_by_idx)); - r->vars = xmalloc( r->value_cnt * sizeof (*r->vars) ); + *var_by_idx = xnmalloc (r->value_cnt, sizeof **var_by_idx); + r->vars = xnmalloc (r->value_cnt, sizeof *r->vars); } @@ -799,8 +801,8 @@ read_variables (struct sfm_reader *r, if ( -1 == r->value_cnt ) { - *var_by_idx = xrealloc (*var_by_idx, sizeof **var_by_idx * (i + 1)); - r->vars = xrealloc(r->vars, (i + 1) * sizeof (*r->vars) ); + *var_by_idx = xnrealloc (*var_by_idx, i + 1, sizeof **var_by_idx); + r->vars = xnrealloc (r->vars, i + 1, sizeof *r->vars); } /* If there was a long string previously, make sure that the @@ -811,7 +813,7 @@ read_variables (struct sfm_reader *r, if (sv.type != -1) lose ((ME, _("%s: position %d: String variable does not have " "proper number of continuation records."), - handle_get_filename (r->fh), i)); + fh_get_filename (r->fh), i)); r->vars[i].width = -1; @@ -822,35 +824,35 @@ read_variables (struct sfm_reader *r, else if (sv.type == -1) lose ((ME, _("%s: position %d: Superfluous long string continuation " "record."), - handle_get_filename (r->fh), i)); + fh_get_filename (r->fh), i)); /* Check fields for validity. */ if (sv.type < 0 || sv.type > 255) lose ((ME, _("%s: position %d: Bad variable type code %d."), - handle_get_filename (r->fh), i, sv.type)); + fh_get_filename (r->fh), i, sv.type)); if (sv.has_var_label != 0 && sv.has_var_label != 1) lose ((ME, _("%s: position %d: Variable label indicator field is not " - "0 or 1."), handle_get_filename (r->fh), i)); + "0 or 1."), fh_get_filename (r->fh), i)); if (sv.n_missing_values < -3 || sv.n_missing_values > 3 || sv.n_missing_values == -1) lose ((ME, _("%s: position %d: Missing value indicator field is not " - "-3, -2, 0, 1, 2, or 3."), handle_get_filename (r->fh), i)); + "-3, -2, 0, 1, 2, or 3."), fh_get_filename (r->fh), i)); /* Copy first character of variable name. */ if (!isalpha ((unsigned char) sv.name[0]) && sv.name[0] != '@' && sv.name[0] != '#') lose ((ME, _("%s: position %d: Variable name begins with invalid " "character."), - handle_get_filename (r->fh), i)); + fh_get_filename (r->fh), i)); if (islower ((unsigned char) sv.name[0])) msg (MW, _("%s: position %d: Variable name begins with lowercase letter " "%c."), - handle_get_filename (r->fh), i, sv.name[0]); + fh_get_filename (r->fh), i, sv.name[0]); if (sv.name[0] == '#') msg (MW, _("%s: position %d: Variable name begins with octothorpe " "(`#'). Scratch variables should not appear in system " "files."), - handle_get_filename (r->fh), i); + fh_get_filename (r->fh), i); name[0] = toupper ((unsigned char) (sv.name[0])); /* Copy remaining characters of variable name. */ @@ -864,7 +866,7 @@ read_variables (struct sfm_reader *r, { msg (MW, _("%s: position %d: Variable name character %d is " "lowercase letter %c."), - handle_get_filename (r->fh), i, j + 1, sv.name[j]); + fh_get_filename (r->fh), i, j + 1, sv.name[j]); name[j] = toupper ((unsigned char) (c)); } else if (isalnum (c) || c == '.' || c == '@' @@ -873,20 +875,20 @@ read_variables (struct sfm_reader *r, else lose ((ME, _("%s: position %d: character `\\%03o' (%c) is not valid in a " "variable name."), - handle_get_filename (r->fh), i, c, c)); + fh_get_filename (r->fh), i, c, c)); } name[j] = 0; if ( ! var_is_valid_name(name, false) ) lose ((ME, _("%s: Invalid variable name `%s' within system file."), - handle_get_filename (r->fh), name)); + fh_get_filename (r->fh), name)); /* Create variable. */ vv = (*var_by_idx)[i] = dict_create_var (dict, name, sv.type); if (vv == NULL) lose ((ME, _("%s: Duplicate variable name `%s' within system file."), - handle_get_filename (r->fh), name)); + fh_get_filename (r->fh), name)); var_set_short_name (vv, vv->name); @@ -910,7 +912,7 @@ read_variables (struct sfm_reader *r, if (len < 0 || len > 255) lose ((ME, _("%s: Variable %s indicates variable label of invalid " "length %d."), - handle_get_filename (r->fh), vv->name, len)); + fh_get_filename (r->fh), vv->name, len)); if ( len != 0 ) { @@ -931,7 +933,7 @@ read_variables (struct sfm_reader *r, if (vv->width > MAX_SHORT_STRING) lose ((ME, _("%s: Long string variable %s may not have missing " "values."), - handle_get_filename (r->fh), vv->name)); + fh_get_filename (r->fh), vv->name)); assertive_buf_read (r, mv, sizeof *mv * mv_cnt, 0); @@ -952,7 +954,7 @@ read_variables (struct sfm_reader *r, if (vv->type == ALPHA) lose ((ME, _("%s: String variable %s may not have missing " "values specified as a range."), - handle_get_filename (r->fh), vv->name)); + fh_get_filename (r->fh), vv->name)); if (mv[0] == r->lowest) mv_add_num_range (&vv->miss, LOWEST, mv[1]); @@ -979,12 +981,12 @@ read_variables (struct sfm_reader *r, if (long_string_count != 0) lose ((ME, _("%s: Long string continuation records omitted at end of " "dictionary."), - handle_get_filename (r->fh))); + fh_get_filename (r->fh))); if (next_value != r->value_cnt) corrupt_msg(MW, _("%s: System file header indicates %d variable positions but " "%d were read from file."), - handle_get_filename (r->fh), r->value_cnt, next_value); + fh_get_filename (r->fh), r->value_cnt, next_value); return 1; @@ -1002,13 +1004,13 @@ parse_format_spec (struct sfm_reader *r, int32 s, f->type = translate_fmt ((s >> 16) & 0xff); if (f->type == -1) lose ((ME, _("%s: Bad format specifier byte (%d)."), - handle_get_filename (r->fh), (s >> 16) & 0xff)); + fh_get_filename (r->fh), (s >> 16) & 0xff)); f->w = (s >> 8) & 0xff; f->d = s & 0xff; if ((v->type == ALPHA) ^ ((formats[f->type].cat & FCAT_STRING) != 0)) lose ((ME, _("%s: %s variable %s has %s format specifier %s."), - handle_get_filename (r->fh), + fh_get_filename (r->fh), v->type == ALPHA ? _("String") : _("Numeric"), v->name, formats[f->type].cat & FCAT_STRING ? _("string") : _("numeric"), @@ -1061,12 +1063,12 @@ read_value_labels (struct sfm_reader *r, if ( n_labels >= ((int32) ~0) / sizeof *labels) { corrupt_msg(MW, _("%s: Invalid number of labels: %d. Ignoring labels."), - handle_get_filename (r->fh), n_labels); + fh_get_filename (r->fh), n_labels); n_labels = 0; } /* Allocate memory. */ - labels = xcalloc (n_labels , sizeof *labels); + labels = xcalloc (n_labels, sizeof *labels); for (i = 0; i < n_labels; i++) labels[i].label = NULL; @@ -1104,7 +1106,7 @@ read_value_labels (struct sfm_reader *r, if (rec_type != 4) lose ((ME, _("%s: Variable index record (type 4) does not immediately " "follow value label record (type 3) as it should."), - handle_get_filename (r->fh))); + fh_get_filename (r->fh))); } /* Read number of variables associated with value label from type 4 @@ -1115,10 +1117,10 @@ read_value_labels (struct sfm_reader *r, if (n_vars < 1 || n_vars > dict_get_var_cnt (dict)) lose ((ME, _("%s: Number of variables associated with a value label (%d) " "is not between 1 and the number of variables (%d)."), - handle_get_filename (r->fh), n_vars, dict_get_var_cnt (dict))); + fh_get_filename (r->fh), n_vars, dict_get_var_cnt (dict))); /* Read the list of variables. */ - var = xmalloc (n_vars * sizeof *var); + var = xnmalloc (n_vars, sizeof *var); for (i = 0; i < n_vars; i++) { int32 var_idx; @@ -1131,7 +1133,7 @@ read_value_labels (struct sfm_reader *r, if (var_idx < 1 || var_idx > r->value_cnt) lose ((ME, _("%s: Variable index associated with value label (%d) is " "not between 1 and the number of values (%d)."), - handle_get_filename (r->fh), var_idx, r->value_cnt)); + fh_get_filename (r->fh), var_idx, r->value_cnt)); /* Make sure it's a real variable. */ v = var_by_idx[var_idx - 1]; @@ -1139,11 +1141,11 @@ read_value_labels (struct sfm_reader *r, lose ((ME, _("%s: Variable index associated with value label (%d) " "refers to a continuation of a string variable, not to " "an actual variable."), - handle_get_filename (r->fh), var_idx)); + fh_get_filename (r->fh), var_idx)); if (v->type == ALPHA && v->width > MAX_SHORT_STRING) lose ((ME, _("%s: Value labels are not allowed on long string " "variables (%s)."), - handle_get_filename (r->fh), v->name)); + fh_get_filename (r->fh), v->name)); /* Add it to the list of variables. */ var[i] = v; @@ -1155,7 +1157,7 @@ read_value_labels (struct sfm_reader *r, lose ((ME, _("%s: Variables associated with value label are not all of " "identical type. Variable %s has %s type, but variable " "%s has %s type."), - handle_get_filename (r->fh), + fh_get_filename (r->fh), var[0]->name, var[0]->type == ALPHA ? _("string") : _("numeric"), var[i]->name, var[i]->type == ALPHA ? _("string") : _("numeric"))); @@ -1195,11 +1197,11 @@ read_value_labels (struct sfm_reader *r, if (var[0]->type == NUMERIC) msg (MW, _("%s: File contains duplicate label for value %g for " "variable %s."), - handle_get_filename (r->fh), label->value.f, v->name); + fh_get_filename (r->fh), label->value.f, v->name); else msg (MW, _("%s: File contains duplicate label for value `%.*s' " "for variable %s."), - handle_get_filename (r->fh), v->width, label->value.s, v->name); + fh_get_filename (r->fh), v->width, label->value.s, v->name); } } @@ -1240,10 +1242,10 @@ buf_read (struct sfm_reader *r, void *buf, size_t byte_cnt, size_t min_alloc) { if (ferror (r->file)) msg (ME, _("%s: Reading system file: %s."), - handle_get_filename (r->fh), strerror (errno)); + fh_get_filename (r->fh), strerror (errno)); else corrupt_msg (ME, _("%s: Unexpected end of file."), - handle_get_filename (r->fh)); + fh_get_filename (r->fh)); return NULL; } return buf; @@ -1258,7 +1260,7 @@ buf_unread(struct sfm_reader *r, size_t byte_cnt) if ( 0 != fseek(r->file, -byte_cnt, SEEK_CUR)) { msg (ME, _("%s: Seeking system file: %s."), - handle_get_filename (r->fh), strerror (errno)); + fh_get_filename (r->fh), strerror (errno)); } } @@ -1274,13 +1276,13 @@ read_documents (struct sfm_reader *r, struct dictionary *dict) if (dict_get_documents (dict) != NULL) lose ((ME, _("%s: System file contains multiple " "type 6 (document) records."), - handle_get_filename (r->fh))); + fh_get_filename (r->fh))); assertive_buf_read (r, &line_cnt, sizeof line_cnt, 0); if (line_cnt <= 0) lose ((ME, _("%s: Number of document lines (%ld) " "must be greater than 0."), - handle_get_filename (r->fh), (long) line_cnt)); + fh_get_filename (r->fh), (long) line_cnt)); documents = buf_read (r, NULL, 80 * line_cnt, line_cnt * 80 + 1); /* FIXME? Run through asciify. */ @@ -1306,12 +1308,12 @@ buffer_input (struct sfm_reader *r) size_t amt; if (r->buf == NULL) - r->buf = xmalloc (sizeof *r->buf * 128); + r->buf = xnmalloc (128, sizeof *r->buf); amt = fread (r->buf, sizeof *r->buf, 128, r->file); if (ferror (r->file)) { msg (ME, _("%s: Error reading file: %s."), - handle_get_filename (r->fh), strerror (errno)); + fh_get_filename (r->fh), strerror (errno)); return 0; } r->ptr = r->buf; @@ -1349,7 +1351,7 @@ read_compressed_data (struct sfm_reader *r, flt64 *buf) if (buf_beg != buf) lose ((ME, _("%s: Compressed data is corrupted. Data ends " "in partial case."), - handle_get_filename (r->fh))); + fh_get_filename (r->fh))); goto error; case 253: /* Code 253 indicates that the value is stored explicitly @@ -1358,7 +1360,7 @@ read_compressed_data (struct sfm_reader *r, flt64 *buf) if (!buffer_input (r)) { lose ((ME, _("%s: Unexpected end of file."), - handle_get_filename (r->fh))); + fh_get_filename (r->fh))); goto error; } memcpy (buf++, r->ptr++, sizeof *buf); @@ -1400,7 +1402,7 @@ read_compressed_data (struct sfm_reader *r, flt64 *buf) { if (buf_beg != buf) lose ((ME, _("%s: Unexpected end of file."), - handle_get_filename (r->fh))); + fh_get_filename (r->fh))); goto error; } memcpy (r->x, r->ptr++, sizeof *buf); @@ -1517,10 +1519,24 @@ fread_ok (struct sfm_reader *r, void *buffer, size_t byte_cnt) { if (ferror (r->file)) msg (ME, _("%s: Reading system file: %s."), - handle_get_filename (r->fh), strerror (errno)); + fh_get_filename (r->fh), strerror (errno)); else if (read_bytes != 0) msg (ME, _("%s: Partial record at end of system file."), - handle_get_filename (r->fh)); + fh_get_filename (r->fh)); return 0; } } + +/* Returns true if FILE is an SPSS system file, + false otherwise. */ +bool +sfm_detect (FILE *file) +{ + struct sysfile_header hdr; + + if (fread (&hdr, sizeof hdr, 1, file) != 1) + return false; + if (strncmp ("$FL2", hdr.rec_type, 4)) + return false; + return true; +}