--- /dev/null
+/* PSPP - a program for statistical analysis.
+ Copyright (C) 2007 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <data/val-type.h>
+#include <libpspp/compiler.h>
+#include <libpspp/float-format.h>
+#include <libpspp/integer-format.h>
+#include <libpspp/misc.h>
+
+#include "error.h"
+#include "minmax.h"
+#include "progname.h"
+#include "xalloc.h"
+
+#include "gettext.h"
+#define _(msgid) gettext (msgid)
+
+struct sfm_reader
+ {
+ const char *file_name;
+ FILE *file;
+
+ int n_variable_records, n_variables;
+
+ enum integer_format integer_format;
+ enum float_format float_format;
+ };
+
+static void read_header (struct sfm_reader *);
+static void read_variable_record (struct sfm_reader *);
+static void read_value_label_record (struct sfm_reader *);
+static void read_document_record (struct sfm_reader *);
+static void read_extension_record (struct sfm_reader *);
+static void read_machine_integer_info (struct sfm_reader *,
+ size_t size, size_t count);
+static void read_machine_float_info (struct sfm_reader *,
+ size_t size, size_t count);
+static void read_display_parameters (struct sfm_reader *,
+ size_t size, size_t count);
+static void read_long_var_name_map (struct sfm_reader *r,
+ size_t size, size_t count);
+static void read_long_string_map (struct sfm_reader *r,
+ size_t size, size_t count);
+
+static struct variable_to_value_map *open_variable_to_value_map (
+ struct sfm_reader *, size_t size);
+static void close_variable_to_value_map (struct variable_to_value_map *);
+static bool read_variable_to_value_map (struct variable_to_value_map *,
+ char **key, char **value);
+
+static void usage (int exit_code);
+static void sys_warn (struct sfm_reader *, const char *, ...)
+ PRINTF_FORMAT (2, 3);
+static void sys_error (struct sfm_reader *, const char *, ...)
+ PRINTF_FORMAT (2, 3)
+ NO_RETURN;
+
+static void read_bytes (struct sfm_reader *, void *, size_t);
+static int read_int (struct sfm_reader *);
+static double read_float (struct sfm_reader *);
+static void read_string (struct sfm_reader *, char *, size_t);
+static void skip_bytes (struct sfm_reader *, size_t);
+static void trim_spaces (char *);
+
+int
+main (int argc, char *argv[])
+{
+ struct sfm_reader r;
+ int rec_type;
+
+ set_program_name (argv[0]);
+ if (argc != 2)
+ usage (EXIT_FAILURE);
+
+ r.file_name = argv[1];
+ r.file = fopen (r.file_name, "rb");
+ if (r.file == NULL)
+ error (EXIT_FAILURE, errno, "error opening \"%s\"", r.file_name);
+ r.n_variable_records = 0;
+ r.n_variables = 0;
+
+ read_header (&r);
+ while ((rec_type = read_int (&r)) != 999)
+ {
+ switch (rec_type)
+ {
+ case 2:
+ read_variable_record (&r);
+ break;
+
+ case 3:
+ read_value_label_record (&r);
+ break;
+
+ case 4:
+ sys_error (&r, _("Misplaced type 4 record."));
+
+ case 6:
+ read_document_record (&r);
+ break;
+
+ case 7:
+ read_extension_record (&r);
+ break;
+
+ default:
+ sys_error (&r, _("Unrecognized record type %d."), rec_type);
+ }
+ }
+ printf ("%08lx: end-of-dictionary record (first byte of data at %08lx)\n",
+ ftell (r.file), ftell (r.file) + 4);
+
+ return 0;
+}
+
+static void
+read_header (struct sfm_reader *r)
+{
+ char rec_type[5];
+ char eye_catcher[61];
+ uint8_t raw_layout_code[4];
+ int32_t layout_code;
+ int32_t nominal_case_size;
+ int32_t compressed;
+ int32_t weight_index;
+ int32_t ncases;
+ uint8_t raw_bias[8];
+ double bias;
+ char creation_date[10];
+ char creation_time[9];
+ char file_label[65];
+
+ read_string (r, rec_type, sizeof rec_type);
+ read_string (r, eye_catcher, sizeof eye_catcher);
+
+ if (strcmp ("$FL2", rec_type) != 0)
+ sys_error (r, _("This is not an SPSS system file."));
+
+ /* Identify integer format. */
+ read_bytes (r, raw_layout_code, sizeof raw_layout_code);
+ if ((!integer_identify (2, raw_layout_code, sizeof raw_layout_code,
+ &r->integer_format)
+ && !integer_identify (3, raw_layout_code, sizeof raw_layout_code,
+ &r->integer_format))
+ || (r->integer_format != INTEGER_MSB_FIRST
+ && r->integer_format != INTEGER_LSB_FIRST))
+ sys_error (r, _("This is not an SPSS system file."));
+ layout_code = integer_get (r->integer_format,
+ raw_layout_code, sizeof raw_layout_code);
+
+ nominal_case_size = read_int (r);
+ compressed = read_int (r) != 0;
+ weight_index = read_int (r);
+ ncases = read_int (r);
+
+ /* Identify floating-point format and obtain compression bias. */
+ read_bytes (r, raw_bias, sizeof raw_bias);
+ if (float_identify (100.0, raw_bias, sizeof raw_bias, &r->float_format) == 0)
+ {
+ sys_warn (r, _("Compression bias is not the usual "
+ "value of 100, or system file uses unrecognized "
+ "floating-point format."));
+ if (r->integer_format == INTEGER_MSB_FIRST)
+ r->float_format = FLOAT_IEEE_DOUBLE_BE;
+ else
+ r->float_format = FLOAT_IEEE_DOUBLE_LE;
+ }
+ bias = float_get_double (r->float_format, raw_bias);
+
+ read_string (r, creation_date, sizeof creation_date);
+ read_string (r, creation_time, sizeof creation_time);
+ read_string (r, file_label, sizeof file_label);
+ trim_spaces (file_label);
+ skip_bytes (r, 3);
+
+ printf ("File header record:\n");
+ printf ("\t%17s: %s\n", "Product name", eye_catcher);
+ printf ("\t%17s: %"PRId32"\n", "Layout code", layout_code);
+ printf ("\t%17s: %"PRId32"\n", "Compressed", compressed);
+ printf ("\t%17s: %"PRId32"\n", "Weight index", weight_index);
+ printf ("\t%17s: %"PRId32"\n", "Number of cases", ncases);
+ printf ("\t%17s: %g\n", "Compression bias", bias);
+ printf ("\t%17s: %s\n", "Creation date", creation_date);
+ printf ("\t%17s: %s\n", "Creation time", creation_time);
+ printf ("\t%17s: \"%s\"\n", "File label", file_label);
+}
+
+static const char *
+format_name (int format)
+{
+ switch ((format >> 16) & 0xff)
+ {
+ case 1: return "A";
+ case 2: return "AHEX";
+ case 3: return "COMMA";
+ case 4: return "DOLLAR";
+ case 5: return "F";
+ case 6: return "IB";
+ case 7: return "PIBHEX";
+ case 8: return "P";
+ case 9: return "PIB";
+ case 10: return "PK";
+ case 11: return "RB";
+ case 12: return "RBHEX";
+ case 15: return "Z";
+ case 16: return "N";
+ case 17: return "E";
+ case 20: return "DATE";
+ case 21: return "TIME";
+ case 22: return "DATETIME";
+ case 23: return "ADATE";
+ case 24: return "JDATE";
+ case 25: return "DTIME";
+ case 26: return "WKDAY";
+ case 27: return "MONTH";
+ case 28: return "MOYR";
+ case 29: return "QYR";
+ case 30: return "WKYR";
+ case 31: return "PCT";
+ case 32: return "DOT";
+ case 33: return "CCA";
+ case 34: return "CCB";
+ case 35: return "CCC";
+ case 36: return "CCD";
+ case 37: return "CCE";
+ case 38: return "EDATE";
+ case 39: return "SDATE";
+ default: return "invalid";
+ }
+}
+
+/* Reads a variable (type 2) record from R and adds the
+ corresponding variable to DICT.
+ Also skips past additional variable records for long string
+ variables. */
+static void
+read_variable_record (struct sfm_reader *r)
+{
+ int width;
+ int has_variable_label;
+ int missing_value_code;
+ int print_format;
+ int write_format;
+ char name[9];
+
+ printf ("%08lx: variable record #%d\n",
+ ftell (r->file), r->n_variable_records++);
+
+ width = read_int (r);
+ has_variable_label = read_int (r);
+ missing_value_code = read_int (r);
+ print_format = read_int (r);
+ write_format = read_int (r);
+ read_string (r, name, sizeof name);
+ name[strcspn (name, " ")] = '\0';
+
+ if (width >= 0)
+ r->n_variables++;
+
+ printf ("\tWidth: %d (%s)\n",
+ width,
+ width > 0 ? "string"
+ : width == 0 ? "numeric"
+ : "long string continuation record");
+ printf ("\tVariable label: %d\n", has_variable_label);
+ printf ("\tMissing values code: %d (%s)\n", missing_value_code,
+ (missing_value_code == 0 ? "no missing values"
+ : missing_value_code == 1 ? "one missing value"
+ : missing_value_code == 2 ? "two missing values"
+ : missing_value_code == 3 ? "three missing values"
+ : missing_value_code == -2 ? "one missing value range"
+ : missing_value_code == -3 ? "one missing value, one range"
+ : "bad value"));
+ printf ("\tPrint format: %06x (%s%d.%d)\n",
+ print_format, format_name (print_format),
+ (print_format >> 8) & 0xff, print_format & 0xff);
+ printf ("\tWrite format: %06x (%s%d.%d)\n",
+ write_format, format_name (write_format),
+ (write_format >> 8) & 0xff, write_format & 0xff);
+ printf ("\tName: %s\n", name);
+
+ /* Get variable label, if any. */
+ if (has_variable_label != 0 && has_variable_label != 1)
+ sys_error (r, _("Variable label indicator field is not 0 or 1."));
+ if (has_variable_label == 1)
+ {
+ long int offset = ftell (r->file);
+ size_t len;
+ char label[255 + 1];
+
+ len = read_int (r);
+ if (len >= sizeof label)
+ sys_error (r, _("Variable %s has label of invalid length %zu."),
+ name, len);
+ read_string (r, label, len + 1);
+ printf("\t%08lx Variable label: \"%s\"\n", offset, label);
+
+ skip_bytes (r, ROUND_UP (len, 4) - len);
+ }
+
+ /* Set missing values. */
+ if (missing_value_code != 0)
+ {
+ int i;
+
+ printf ("\t%08lx Missing values:", ftell (r->file));
+ if (!width)
+ {
+ if (missing_value_code < -3 || missing_value_code > 3
+ || missing_value_code == -1)
+ sys_error (r, _("Numeric missing value indicator field is not "
+ "-3, -2, 0, 1, 2, or 3."));
+ if (missing_value_code < 0)
+ {
+ double low = read_float (r);
+ double high = read_float (r);
+ printf (" %g...%g", low, high);
+ missing_value_code = -missing_value_code - 2;
+ }
+ for (i = 0; i < missing_value_code; i++)
+ printf (" %g", read_float (r));
+ }
+ else if (width > 0)
+ {
+ if (missing_value_code < 1 || missing_value_code > 3)
+ sys_error (r, _("String missing value indicator field is not "
+ "0, 1, 2, or 3."));
+ for (i = 0; i < missing_value_code; i++)
+ {
+ char string[9];
+ read_string (r, string, sizeof string);
+ printf (" \"%s\"", string);
+ }
+ }
+ putchar ('\n');
+ }
+}
+
+/* Reads value labels from sysfile R and inserts them into the
+ associated dictionary. */
+static void
+read_value_label_record (struct sfm_reader *r)
+{
+ int label_cnt, var_cnt;
+ int i;
+
+ printf ("%08lx: value labels record\n", ftell (r->file));
+
+ /* Read number of labels. */
+ label_cnt = read_int (r);
+ for (i = 0; i < label_cnt; i++)
+ {
+ char raw_value[8];
+ double value;
+ int n_printable;
+ unsigned char label_len;
+ size_t padded_len;
+ char label[256];
+
+ read_bytes (r, raw_value, sizeof raw_value);
+ value = float_get_double (r->float_format, raw_value);
+ for (n_printable = 0; n_printable < sizeof raw_value; n_printable++)
+ if (!isprint (raw_value[n_printable]))
+ break;
+
+ /* Read label length. */
+ read_bytes (r, &label_len, sizeof label_len);
+ padded_len = ROUND_UP (label_len + 1, 8);
+
+ /* Read label, padding. */
+ read_bytes (r, label, padded_len - 1);
+ label[label_len] = 0;
+
+ printf ("\t%g/\"%.*s\": \"%s\"\n", value, n_printable, raw_value, label);
+ }
+
+ /* Now, read the type 4 record that has the list of variables
+ to which the value labels are to be applied. */
+
+ /* Read record type of type 4 record. */
+ if (read_int (r) != 4)
+ sys_error (r, _("Variable index record (type 4) does not immediately "
+ "follow value label record (type 3) as it should."));
+
+ /* Read number of variables associated with value label from type 4
+ record. */
+ printf ("\t%08lx: apply to variables", ftell (r->file));
+ var_cnt = read_int (r);
+ for (i = 0; i < var_cnt; i++)
+ printf (" #%d", read_int (r));
+ putchar ('\n');
+}
+
+static void
+read_document_record (struct sfm_reader *r)
+{
+ int n_lines;
+ int i;
+
+ printf ("%08lx: document record\n", ftell (r->file));
+ n_lines = read_int (r);
+ printf ("\t%d lines of documents\n", n_lines);
+
+ for (i = 0; i < n_lines; i++)
+ {
+ char line[81];
+ printf ("\t%08lx: ", ftell (r->file));
+ read_string (r, line, sizeof line);
+ trim_spaces (line);
+ printf ("line %d: \"%s\"\n", i, line);
+ }
+}
+
+static void
+read_extension_record (struct sfm_reader *r)
+{
+ long int offset = ftell (r->file);
+ int subtype = read_int (r);
+ size_t size = read_int (r);
+ size_t count = read_int (r);
+ size_t bytes = size * count;
+
+ printf ("%08lx: Record 7, subtype %d, size=%zu, count=%zu\n",
+ offset, subtype, size, count);
+
+ switch (subtype)
+ {
+ case 3:
+ read_machine_integer_info (r, size, count);
+ return;
+
+ case 4:
+ read_machine_float_info (r, size, count);
+ return;
+
+ case 5:
+ /* Variable sets information. We don't use these yet.
+ They only apply to GUIs; see VARSETS on the APPLY
+ DICTIONARY command in SPSS documentation. */
+ break;
+
+ case 6:
+ /* DATE variable information. We don't use it yet, but we
+ should. */
+ break;
+
+ case 7:
+ /* Unknown purpose. */
+ break;
+
+ case 11:
+ read_display_parameters (r, size, count);
+ return;
+
+ case 13:
+ read_long_var_name_map (r, size, count);
+ return;
+
+ case 14:
+ read_long_string_map (r, size, count);
+ return;
+
+ case 16:
+ /* New in SPSS v14? Unknown purpose. */
+ break;
+
+ case 17:
+ /* Text field that defines variable attributes. New in
+ SPSS 14. */
+ break;
+
+ default:
+ sys_warn (r, _("Unrecognized record type 7, subtype %d."), subtype);
+ break;
+ }
+
+ skip_bytes (r, bytes);
+}
+
+static void
+read_machine_integer_info (struct sfm_reader *r, size_t size, size_t count)
+{
+ long int offset = ftell (r->file);
+ int version_major = read_int (r);
+ int version_minor = read_int (r);
+ int version_revision = read_int (r);
+ int machine_code = read_int (r);
+ int float_representation = read_int (r);
+ int compression_code = read_int (r);
+ int integer_representation = read_int (r);
+ int character_code = read_int (r);
+
+ printf ("%08lx: machine integer info\n", offset);
+ if (size != 4 || count != 8)
+ sys_error (r, _("Bad size (%zu) or count (%zu) field on record type 7, "
+ "subtype 3."),
+ size, count);
+
+ printf ("\tVersion: %d.%d.%d\n",
+ version_major, version_minor, version_revision);
+ printf ("\tMachine code: %d\n", machine_code);
+ printf ("\tFloating point representation: %d (%s)\n",
+ float_representation,
+ float_representation == 1 ? "IEEE 754"
+ : float_representation == 2 ? "IBM 370"
+ : float_representation == 3 ? "DEC VAX"
+ : "unknown");
+ printf ("\tCompression code: %d\n", compression_code);
+ printf ("\tEndianness: %d (%s)\n", integer_representation,
+ integer_representation == 1 ? "big"
+ : integer_representation == 2 ? "little" : "unknown");
+ printf ("\tCharacter code: %d\n", character_code);
+}
+
+/* Read record type 7, subtype 4. */
+static void
+read_machine_float_info (struct sfm_reader *r, size_t size, size_t count)
+{
+ long int offset = ftell (r->file);
+ double sysmis = read_float (r);
+ double highest = read_float (r);
+ double lowest = read_float (r);
+
+ printf ("%08lx: machine float info\n", offset);
+ if (size != 8 || count != 3)
+ sys_error (r, _("Bad size (%zu) or count (%zu) on extension 4."),
+ size, count);
+
+ printf ("\tsysmis: %g\n", sysmis);
+ if (sysmis != SYSMIS)
+ sys_warn (r, _("File specifies unexpected value %g as SYSMIS."), sysmis);
+ printf ("\thighest: %g\n", highest);
+ if (highest != HIGHEST)
+ sys_warn (r, _("File specifies unexpected value %g as HIGHEST."), highest);
+ printf ("\tlowest: %g\n", lowest);
+ if (lowest != LOWEST)
+ sys_warn (r, _("File specifies unexpected value %g as LOWEST."), lowest);
+}
+
+/* Read record type 7, subtype 11. */
+static void
+read_display_parameters (struct sfm_reader *r, size_t size, size_t count)
+{
+ size_t n_vars;
+ bool includes_width;
+ size_t i;
+
+ printf ("%08lx: variable display parameters\n", ftell (r->file));
+ if (size != 4)
+ {
+ sys_warn (r, _("Bad size %zu on extension 11."), size);
+ skip_bytes (r, size * count);
+ return;
+ }
+
+ n_vars = r->n_variables;
+ if (count == 3 * n_vars)
+ includes_width = true;
+ else if (count == 2 * n_vars)
+ includes_width = false;
+ else
+ {
+ sys_warn (r, _("Extension 11 has bad count %zu (for %zu variables)."),
+ count, n_vars);
+ skip_bytes (r, size * count);
+ return;
+ }
+
+ for (i = 0; i < n_vars; ++i)
+ {
+ int measure = read_int (r);
+ int width = includes_width ? read_int (r) : 0;
+ int align = read_int (r);
+
+ printf ("\tVar #%zu: measure=%d (%s)", i, measure,
+ (measure == 1 ? "nominal"
+ : measure == 2 ? "ordinal"
+ : measure == 3 ? "scale"
+ : "invalid"));
+ if (includes_width)
+ printf (", width=%d", width);
+ printf (", align=%d (%s)\n", align,
+ (align == 0 ? "left"
+ : align == 1 ? "right"
+ : align == 2 ? "centre"
+ : "invalid"));
+ }
+}
+
+/* Reads record type 7, subtype 13, which gives the long name
+ that corresponds to each short name. */
+static void
+read_long_var_name_map (struct sfm_reader *r, size_t size, size_t count)
+{
+ struct variable_to_value_map *map;
+ char *var;
+ char *long_name;
+
+ printf ("%08lx: long variable names (short => long)\n", ftell (r->file));
+ map = open_variable_to_value_map (r, size * count);
+ while (read_variable_to_value_map (map, &var, &long_name))
+ printf ("\t%s => %s\n", var, long_name);
+ close_variable_to_value_map (map);
+}
+
+/* Reads record type 7, subtype 14, which gives the real length
+ of each very long string. Rearranges DICT accordingly. */
+static void
+read_long_string_map (struct sfm_reader *r, size_t size, size_t count)
+{
+ struct variable_to_value_map *map;
+ char *var;
+ char *length_s;
+
+ printf ("%08lx: very long strings (variable => length)\n", ftell (r->file));
+ map = open_variable_to_value_map (r, size * count);
+ while (read_variable_to_value_map (map, &var, &length_s))
+ printf ("\t%s => %d\n", var, atoi (length_s));
+ close_variable_to_value_map (map);
+}
+\f
+/* Helpers for reading records that contain "variable=value"
+ pairs. */
+
+/* State. */
+struct variable_to_value_map
+ {
+ char *buffer; /* Record contents. */
+ size_t size; /* Size of buffer. */
+ size_t pos; /* Current position in buffer. */
+ };
+
+/* Reads SIZE bytes into a "variable=value" map for R,
+ and returns the map. */
+static struct variable_to_value_map *
+open_variable_to_value_map (struct sfm_reader *r, size_t size)
+{
+ struct variable_to_value_map *map = xmalloc (sizeof *map);
+ char *buffer = xmalloc (size + 1);
+ read_bytes (r, buffer, size);
+ map->buffer = buffer;
+ map->size = size;
+ map->pos = 0;
+ return map;
+}
+
+/* Closes MAP and frees its storage.
+ Not really needed, because the pool will free the map anyway,
+ but can be used to free it earlier. */
+static void
+close_variable_to_value_map (struct variable_to_value_map *map)
+{
+ free (map);
+ free (map->buffer);
+}
+
+static char *
+tokenize (struct variable_to_value_map *map, int delimiter)
+{
+ size_t start = map->pos;
+ while (map->pos < map->size
+ && map->buffer[map->pos] != delimiter
+ && map->buffer[map->pos] != '\0')
+ map->pos++;
+ if (map->pos == map->size)
+ return NULL;
+ map->buffer[map->pos++] = '\0';
+ return &map->buffer[start];
+}
+
+/* Reads the next variable=value pair from MAP.
+ Looks up the variable in DICT and stores it into *VAR.
+ Stores a null-terminated value into *VALUE. */
+static bool
+read_variable_to_value_map (struct variable_to_value_map *map,
+ char **key, char **value)
+{
+ *key = tokenize (map, '=');
+ *value = tokenize (map, '\t');
+ if (!*key || !*value)
+ return false;
+
+ while (map->pos < map->size
+ && (map->buffer[map->pos] == '\t'
+ || map->buffer[map->pos] == '\0'))
+ map->pos++;
+ return true;
+}
+\f
+static void
+usage (int exit_code)
+{
+ printf ("usage: %s SYSFILE, where SYSFILE is the name of a system file\n",
+ program_name);
+ exit (exit_code);
+}
+
+/* Displays a corruption message. */
+static void
+sys_msg (struct sfm_reader *r, const char *format, va_list args)
+{
+ printf ("\"%s\" near offset 0x%lx: ",
+ r->file_name, (unsigned long) ftell (r->file));
+ vprintf (format, args);
+ putchar ('\n');
+}
+
+/* Displays a warning for the current file position. */
+static void
+sys_warn (struct sfm_reader *r, const char *format, ...)
+{
+ va_list args;
+
+ va_start (args, format);
+ sys_msg (r, format, args);
+ va_end (args);
+}
+
+/* Displays an error for the current file position,
+ marks it as in an error state,
+ and aborts reading it using longjmp. */
+static void
+sys_error (struct sfm_reader *r, const char *format, ...)
+{
+ va_list args;
+
+ va_start (args, format);
+ sys_msg (r, format, args);
+ va_end (args);
+
+ exit (EXIT_FAILURE);
+}
+\f
+/* Reads BYTE_CNT bytes into BUF.
+ Returns true if exactly BYTE_CNT bytes are successfully read.
+ Aborts if an I/O error or a partial read occurs.
+ If EOF_IS_OK, then an immediate end-of-file causes false to be
+ returned; otherwise, immediate end-of-file causes an abort
+ too. */
+static inline bool
+read_bytes_internal (struct sfm_reader *r, bool eof_is_ok,
+ void *buf, size_t byte_cnt)
+{
+ size_t bytes_read = fread (buf, 1, byte_cnt, r->file);
+ if (bytes_read == byte_cnt)
+ return true;
+ else if (ferror (r->file))
+ sys_error (r, _("System error: %s."), strerror (errno));
+ else if (!eof_is_ok || bytes_read != 0)
+ sys_error (r, _("Unexpected end of file."));
+ else
+ return false;
+}
+
+/* Reads BYTE_CNT into BUF.
+ Aborts upon I/O error or if end-of-file is encountered. */
+static void
+read_bytes (struct sfm_reader *r, void *buf, size_t byte_cnt)
+{
+ read_bytes_internal (r, false, buf, byte_cnt);
+}
+
+/* Reads a 32-bit signed integer from R and returns its value in
+ host format. */
+static int
+read_int (struct sfm_reader *r)
+{
+ uint8_t integer[4];
+ read_bytes (r, integer, sizeof integer);
+ return integer_get (r->integer_format, integer, sizeof integer);
+}
+
+/* Reads a 64-bit floating-point number from R and returns its
+ value in host format. */
+static double
+read_float (struct sfm_reader *r)
+{
+ uint8_t number[8];
+ read_bytes (r, number, sizeof number);
+ return float_get_double (r->float_format, number);
+}
+
+/* Reads exactly SIZE - 1 bytes into BUFFER
+ and stores a null byte into BUFFER[SIZE - 1]. */
+static void
+read_string (struct sfm_reader *r, char *buffer, size_t size)
+{
+ assert (size > 0);
+ read_bytes (r, buffer, size - 1);
+ buffer[size - 1] = '\0';
+}
+
+/* Skips BYTES bytes forward in R. */
+static void
+skip_bytes (struct sfm_reader *r, size_t bytes)
+{
+ while (bytes > 0)
+ {
+ char buffer[1024];
+ size_t chunk = MIN (sizeof buffer, bytes);
+ read_bytes (r, buffer, chunk);
+ bytes -= chunk;
+ }
+}
+
+static void
+trim_spaces (char *s)
+{
+ char *end = strchr (s, '\0');
+ while (end > s && end[-1] == ' ')
+ end--;
+ *end = '\0';
+}
projects / pspp-builds.git / commitdiff