From: Ben Pfaff Date: Sun, 3 Feb 2008 06:52:12 +0000 (+0000) Subject: Add new utility "dissect-sysfile". X-Git-Tag: v0.6.0~137 X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=025c8c504b302d7ffce6800134df494a4a68a5f5;p=pspp-builds.git Add new utility "dissect-sysfile". Patch #6347. --- diff --git a/src/libpspp/float-format.c b/src/libpspp/float-format.c index 332e2e78..0450dbea 100644 --- a/src/libpspp/float-format.c +++ b/src/libpspp/float-format.c @@ -21,10 +21,10 @@ #include #include #include +#include #include #include -#include #include "error.h" #include diff --git a/tests/ChangeLog b/tests/ChangeLog index 6511612f..fa30dd50 100644 --- a/tests/ChangeLog +++ b/tests/ChangeLog @@ -1,3 +1,9 @@ +2008-02-02 Ben Pfaff + + * automake.mk: Add target for dissect-sysfile. + + * dissect-sysfile.c: New program. + 2008-02-01 Ben Pfaff * automake.mk: Add new test. diff --git a/tests/automake.mk b/tests/automake.mk index b8ab5d63..aa9a92ff 100644 --- a/tests/automake.mk +++ b/tests/automake.mk @@ -255,6 +255,13 @@ tests_libpspp_sparse_array_test_CPPFLAGS = $(AM_CPPFLAGS) -DASSERT_LEVEL=10 tests_formats_inexactify_SOURCES = tests/formats/inexactify.c +noinst_PROGRAMS += tests/dissect-sysfile +tests_dissect_sysfile_SOURCES = \ + src/libpspp/integer-format.c \ + src/libpspp/float-format.c \ + tests/dissect-sysfile.c +tests_dissect_sysfile_LDADD = gl/libgl.la @LIBINTL@ + EXTRA_DIST += \ $(dist_TESTS) \ tests/Book1.gnm.unzipped \ diff --git a/tests/dissect-sysfile.c b/tests/dissect-sysfile.c new file mode 100644 index 00000000..53268423 --- /dev/null +++ b/tests/dissect-sysfile.c @@ -0,0 +1,834 @@ +/* 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 . */ + +#include + +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#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); +} + +/* 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; +} + +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); +} + +/* 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'; +}