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tdepim/libkcal/libical/vzic-1.3/vzic-parse.c

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/*
* Vzic - a program to convert Olson timezone database files into VZTIMEZONE
* files compatible with the iCalendar specification (RFC2445).
*
* Copyright (C) 2000-2001 Ximian, Inc.
* Copyright (C) 2003 Damon Chaplin.
*
* Author: Damon Chaplin <damon@gnome.org>
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include "vzic.h"
#include "vzic-parse.h"
/* This is the maximum line length we allow. */
#define MAX_LINE_LEN 1024
/* The maximum number of fields on a line. */
#define MAX_FIELDS 12
typedef enum
{
ZONE_ID = 0, /* The 'Zone' at the start of the line. */
ZONE_NAME = 1,
ZONE_GMTOFF = 2,
ZONE_RULES_SAVE = 3,
ZONE_FORMAT = 4,
ZONE_UNTIL_YEAR = 5,
ZONE_UNTIL_MONTH = 6,
ZONE_UNTIL_DAY = 7,
ZONE_UNTIL_TIME = 8
} ZoneFieldNumber;
typedef enum
{
RULE_ID = 0, /* The 'Rule' at the start of the line. */
RULE_NAME = 1,
RULE_FROM = 2,
RULE_TO = 3,
RULE_TYPE = 4,
RULE_IN = 5,
RULE_ON = 6,
RULE_AT = 7,
RULE_SAVE = 8,
RULE_LETTER_S = 9
} RuleFieldNumber;
typedef enum
{
LINK_ID = 0, /* The 'Link' at the start of the line. */
LINK_FROM = 1,
LINK_TO = 2
} LinkFieldNumber;
/* This struct contains information used while parsing the files, and is
passed to most parsing functions. */
typedef struct _ParsingData ParsingData;
struct _ParsingData
{
/* This is the line being parsed. buffer is a copy that we break into fields
and sub-fields as it is parsed. */
char line[MAX_LINE_LEN];
char buffer[MAX_LINE_LEN];
/* These are pointers to the start of each field in buffer. */
char *fields[MAX_FIELDS];
int num_fields;
/* These are just for producing error messages. */
char *filename;
int line_number;
/* This is an array of ZoneData structs, 1 for each timezone read. */
GArray *zone_data;
/* This is a hash table of arrays of RuleData structs. As each Rule line is
read in, a new RuleData struct is filled in and appended to the
appropriate GArray in the hash table. */
GHashTable *rule_data;
/* A hash containing data on the Link lines. The keys are the timezones
where the link is from (i.e. the timezone we will be outputting anyway)
and the data is a GList of timezones to link to (where we will copy the
timezone data to). */
GHashTable *link_data;
int max_until_year;
};
/*
* Parsing functions, used when reading the Olson timezone data file.
*/
static void parse_fields (ParsingData *data);
static gboolean parse_zone_line (ParsingData *data);
static gboolean parse_zone_continuation_line (ParsingData *data);
static gboolean parse_zone_common (ParsingData *data,
int offset);
static void parse_rule_line (ParsingData *data);
static void parse_link_line (ParsingData *data);
static int parse_year (ParsingData *data,
char *field,
gboolean accept_only,
int only_value);
static int parse_month (ParsingData *data,
char *field);
static DayCode parse_day (ParsingData *data,
char *field,
int *day,
int *weekday);
static int parse_weekday (ParsingData *data,
char *field);
static int parse_time (ParsingData *data,
char *field,
TimeCode *time_code);
static int parse_number (ParsingData *data,
char **num);
static int parse_rules_save (ParsingData *data,
char *field,
char **rules);
static void parse_coord (char *coord,
int len,
int *result);
void
parse_olson_file (char *filename,
GArray **zone_data,
GHashTable **rule_data,
GHashTable **link_data,
int *max_until_year)
{
ParsingData data;
FILE *fp;
int zone_continues = 0;
*zone_data = g_array_new (FALSE, FALSE, sizeof (ZoneData));
*rule_data = g_hash_table_new (g_str_hash, g_str_equal);
*link_data = g_hash_table_new (g_str_hash, g_str_equal);
fp = fopen (filename, "r");
if (!fp) {
fprintf (stderr, "Couldn't open file: %s\n", filename);
exit (1);
}
data.filename = filename;
data.zone_data = *zone_data;
data.rule_data = *rule_data;
data.link_data = *link_data;
data.max_until_year = 0;
for (data.line_number = 0; ; data.line_number++) {
if (fgets (data.line, sizeof (data.line), fp) != data.line)
break;
strcpy (data.buffer, data.line);
parse_fields (&data);
if (data.num_fields == 0)
continue;
if (zone_continues) {
zone_continues = parse_zone_continuation_line (&data);
} else if (!strcmp (data.fields[0], "Zone")) {
zone_continues = parse_zone_line (&data);
} else if (!strcmp (data.fields[0], "Rule")) {
parse_rule_line (&data);
} else if (!strcmp (data.fields[0], "Link")) {
parse_link_line (&data);
} else if (!strcmp (data.fields[0], "Leap")) {
/* We don't care about Leap lines. */
} else {
fprintf (stderr, "%s:%i: Invalid line.\n%s\n", filename,
data.line_number, data.line);
exit (1);
}
}
if (ferror (fp)) {
fprintf (stderr, "Error reading file: %s\n", filename);
exit (1);
}
if (zone_continues) {
fprintf (stderr, "%s:%i: Zone continuation line expected.\n%s\n",
filename, data.line_number, data.line);
exit (1);
}
fclose (fp);
#if 0
printf ("Max UNTIL year: %i\n", data.max_until_year);
#endif
*max_until_year = data.max_until_year;
}
/* Converts the line into fields. */
static void
parse_fields (ParsingData *data)
{
int i;
char *p, *s, ch;
/* Reset all fields to NULL. */
for (i = 0; i < MAX_FIELDS; i++)
data->fields[i] = 0;
data->num_fields = 0;
p = data->buffer;
for (;;) {
/* Skip whitespace. */
while (isspace (*p))
p++;
/* See if we have reached the end of the line or a comment. */
if (*p == '\0' || *p == '#')
break;
/* We must have another field, so save the start position. */
data->fields[data->num_fields++] = p;
/* Now find the end of the field. If the field contains '"' characters
they are removed and we have to move the rest of the chars back. */
s = p;
for (;;) {
ch = *p;
if (ch == '\0' || ch == '#') {
/* Don't move p on since this is the end of the line. */
*s = '\0';
break;
} else if (isspace (ch)) {
*s = '\0';
p++;
break;
} else if (ch == '"') {
p++;
for (;;) {
ch = *p;
if (ch == '\0') {
fprintf (stderr,
"%s:%i: Closing quote character ('\"') missing.\n%s\n",
data->filename, data->line_number, data->line);
exit (1);
} else if (ch == '"') {
p++;
break;
} else {
*s++ = ch;
}
p++;
}
} else {
*s++ = ch;
}
p++;
}
}
#if 0
printf ("%i fields: ", data->num_fields);
for (i = 0; i < data->num_fields; i++)
printf ("'%s' ", data->fields[i]);
printf ("\n");
#endif
}
static gboolean
parse_zone_line (ParsingData *data)
{
ZoneData zone;
/* All 5 fields up to FORMAT must be present. */
if (data->num_fields < 5 || data->num_fields > 9) {
fprintf (stderr, "%s:%i: Invalid Zone line - %i fields.\n%s\n",
data->filename, data->line_number, data->num_fields,
data->line);
exit (1);
}
zone.zone_name = g_strdup (data->fields[ZONE_NAME]);
zone.zone_line_data = g_array_new (FALSE, FALSE, sizeof (ZoneLineData));
g_array_append_val (data->zone_data, zone);
return parse_zone_common (data, 0);
}
static gboolean
parse_zone_continuation_line (ParsingData *data)
{
/* All 3 fields up to FORMAT must be present. */
if (data->num_fields < 3 || data->num_fields > 7) {
fprintf (stderr,
"%s:%i: Invalid Zone continuation line - %i fields.\n%s\n",
data->filename, data->line_number, data->num_fields,
data->line);
exit (1);
}
return parse_zone_common (data, -2);
}
static gboolean
parse_zone_common (ParsingData *data,
int offset)
{
ZoneData *zone;
ZoneLineData zone_line;
TimeCode time_code;
zone_line.stdoff_seconds = parse_time (data,
data->fields[ZONE_GMTOFF + offset],
&time_code);
zone_line.save_seconds = parse_rules_save (data,
data->fields[ZONE_RULES_SAVE + offset],
&zone_line.rules);
if (!VzicPureOutput) {
/* We round the UTC offsets to the nearest minute, to be compatible with
Outlook. This also works with -ve numbers, I think.
-56 % 60 = -59. -61 % 60 = -1. */
if (zone_line.stdoff_seconds >= 0)
zone_line.stdoff_seconds += 30;
else
zone_line.stdoff_seconds -= 29;
zone_line.stdoff_seconds -= zone_line.stdoff_seconds % 60;
if (zone_line.save_seconds >= 0)
zone_line.save_seconds += 30;
else
zone_line.save_seconds -= 29;
zone_line.save_seconds -= zone_line.save_seconds % 60;
}
zone_line.format = g_strdup (data->fields[ZONE_FORMAT + offset]);
if (data->num_fields - offset >= 6) {
zone_line.until_set = TRUE;
zone_line.until_year = parse_year (data,
data->fields[ZONE_UNTIL_YEAR + offset],
FALSE, 0);
zone_line.until_month = parse_month (data,
data->fields[ZONE_UNTIL_MONTH + offset]);
zone_line.until_day_code = parse_day (data,
data->fields[ZONE_UNTIL_DAY + offset],
&zone_line.until_day_number,
&zone_line.until_day_weekday);
zone_line.until_time_seconds = parse_time (data,
data->fields[ZONE_UNTIL_TIME + offset],
&zone_line.until_time_code);
/* We also want to know the maximum year used in any UNTIL value, so we
know where to expand all the infinite Rule data to. */
if (zone_line.until_year != YEAR_MAXIMUM
&& zone_line.until_year != YEAR_MINIMUM)
data->max_until_year = MAX (data->max_until_year, zone_line.until_year);
} else {
zone_line.until_set = FALSE;
}
/* Append it to the last Zone, since that is the one we are currently
reading. */
zone = &g_array_index (data->zone_data, ZoneData, data->zone_data->len - 1);
g_array_append_val (zone->zone_line_data, zone_line);
return zone_line.until_set;
}
static void
parse_rule_line (ParsingData *data)
{
GArray *rule_array;
RuleData rule;
char *name;
TimeCode time_code;
/* All 10 fields must be present. */
if (data->num_fields != 10) {
fprintf (stderr, "%s:%i: Invalid Rule line - %i fields.\n%s\n",
data->filename, data->line_number, data->num_fields,
data->line);
exit (1);
}
name = data->fields[RULE_NAME];
/* Create the GArray and add it to the hash table if it doesn't already
exist. */
rule_array = g_hash_table_lookup (data->rule_data, name);
if (!rule_array) {
rule_array = g_array_new (FALSE, FALSE, sizeof (RuleData));
g_hash_table_insert (data->rule_data, g_strdup (name), rule_array);
}
rule.from_year = parse_year (data, data->fields[RULE_FROM], FALSE, 0);
if (rule.from_year == YEAR_MAXIMUM) {
fprintf (stderr, "%s:%i: Invalid Rule FROM value: '%s'\n",
data->filename, data->line_number, data->fields[RULE_FROM]);
exit (1);
}
rule.to_year = parse_year (data, data->fields[RULE_TO], TRUE,
rule.from_year);
if (rule.to_year == YEAR_MINIMUM) {
fprintf (stderr, "%s:%i: Invalid Rule TO value: %s\n",
data->filename, data->line_number, data->fields[RULE_TO]);
exit (1);
}
if (!strcmp (data->fields[RULE_TYPE], "-"))
rule.type = NULL;
else {
printf ("Type: %s\n", data->fields[RULE_TYPE]);
rule.type = g_strdup (data->fields[RULE_TYPE]);
}
rule.in_month = parse_month (data, data->fields[RULE_IN]);
rule.on_day_code = parse_day (data, data->fields[RULE_ON],
&rule.on_day_number, &rule.on_day_weekday);
rule.at_time_seconds = parse_time (data, data->fields[RULE_AT],
&rule.at_time_code);
rule.save_seconds = parse_time (data, data->fields[RULE_SAVE], &time_code);
if (!strcmp (data->fields[RULE_LETTER_S], "-")) {
rule.letter_s = NULL;
} else {
rule.letter_s = g_strdup (data->fields[RULE_LETTER_S]);
}
rule.is_shallow_copy = FALSE;
g_array_append_val (rule_array, rule);
}
static void
parse_link_line (ParsingData *data)
{
char *from, *to, *old_from;
GList *zone_list;
/* We must have 3 fields for a Link. */
if (data->num_fields != 3) {
fprintf (stderr, "%s:%i: Invalid Rule line - %i fields.\n%s\n",
data->filename, data->line_number, data->num_fields,
data->line);
exit (1);
}
from = data->fields[LINK_FROM];
to = data->fields[LINK_TO];
#if 0
printf ("LINK FROM: %s\tTO: %s\n", from, to);
#endif
if (g_hash_table_lookup_extended (data->link_data, from,
(gpointer) &old_from,
(gpointer) &zone_list)) {
from = old_from;
} else {
from = g_strdup (from);
zone_list = NULL;
}
zone_list = g_list_prepend (zone_list, g_strdup (to));
g_hash_table_insert (data->link_data, from, zone_list);
}
static int
parse_year (ParsingData *data,
char *field,
gboolean accept_only,
int only_value)
{
int len, year = 0;
char *p;
if (!field) {
fprintf (stderr, "%s:%i: Missing year.\n%s\n", data->filename,
data->line_number, data->line);
exit (1);
}
len = strlen (field);
if (accept_only && !strncmp (field, "only", len))
return only_value;
if (len >= 2) {
if (!strncmp (field, "maximum", len))
return YEAR_MAXIMUM;
else if (!strncmp (field, "minimum", len))
return YEAR_MINIMUM;
}
for (p = field; *p; p++) {
if (*p < '0' || *p > '9') {
fprintf (stderr, "%s:%i: Invalid year: %s\n%s\n", data->filename,
data->line_number, field, data->line);
exit (1);
}
year = year * 10 + *p - '0';
}
if (year < 1000 || year > 2037) {
fprintf (stderr, "%s:%i: Strange year: %s\n%s\n", data->filename,
data->line_number, field, data->line);
exit (1);
}
return year;
}
/* Parses a month name, returning 0 (Jan) to 11 (Dec). */
static int
parse_month (ParsingData *data,
char *field)
{
static char* months[] = { "january", "february", "march", "april", "may",
"june", "july", "august", "september", "october",
"november", "december" };
char *p;
int len, i;
/* If the field is missing, it must be the optional UNTIL month, so we return
0 for January. */
if (!field)
return 0;
for (p = field, len = 0; *p; p++, len++) {
*p = tolower (*p);
}
for (i = 0; i < 12; i++) {
if (!strncmp (field, months[i], len))
return i;
}
fprintf (stderr, "%s:%i: Invalid month: %s\n%s\n", data->filename,
data->line_number, field, data->line);
exit (1);
}
/* Parses a day specifier, returning a code representing the type of match
together with a day of the month and a weekday number (0=Sun). */
static DayCode
parse_day (ParsingData *data,
char *field,
int *day,
int *weekday)
{
char *day_part, *p;
DayCode day_code;
if (!field) {
*day = 1;
return DAY_SIMPLE;
}
*day = *weekday = 0;
if (!strncmp (field, "last", 4)) {
*weekday = parse_weekday (data, field + 4);
/* We set the day to the end of the month to make sorting Rules easy. */
*day = 31;
return DAY_LAST_WEEKDAY;
}
day_part = field;
day_code = DAY_SIMPLE;
for (p = field; *p; p++) {
if (*p == '<' || *p == '>') {
if (*(p + 1) == '=') {
day_code = (*p == '<') ? DAY_WEEKDAY_ON_OR_BEFORE
: DAY_WEEKDAY_ON_OR_AFTER;
*p = '\0';
*weekday = parse_weekday (data, field);
day_part = p + 2;
break;
}
fprintf (stderr, "%s:%i: Invalid day: %s\n%s\n", data->filename,
data->line_number, field, data->line);
exit (1);
}
}
for (p = day_part; *p; p++) {
if (*p < '0' || *p > '9') {
fprintf (stderr, "%s:%i: Invalid day: %s\n%s\n", data->filename,
data->line_number, field, data->line);
exit (1);
}
*day = *day * 10 + *p - '0';
}
if (*day < 1 || *day > 31) {
fprintf (stderr, "%s:%i: Invalid day: %s\n%s\n", data->filename,
data->line_number, field, data->line);
exit (1);
}
return day_code;
}
/* Parses a weekday name, returning 0 (Sun) to 6 (Sat). */
static int
parse_weekday (ParsingData *data,
char *field)
{
static char* weekdays[] = { "sunday", "monday", "tuesday", "wednesday",
"thursday", "friday", "saturday" };
char *p;
int len, i;
for (p = field, len = 0; *p; p++, len++) {
*p = tolower (*p);
}
for (i = 0; i < 7; i++) {
if (!strncmp (field, weekdays[i], len))
return i;
}
fprintf (stderr, "%s:%i: Invalid weekday: %s\n%s\n", data->filename,
data->line_number, field, data->line);
exit (1);
}
/* Parses a time (hour + minute + second) and returns the result in seconds,
together with a time code specifying whether it is Wall clock time,
local standard time, or universal time.
The time can start with a '-' in which case it will be negative. */
static int
parse_time (ParsingData *data,
char *field,
TimeCode *time_code)
{
char *p;
int hours = 0, minutes = 0, seconds = 0, result, negative = 0;
if (!field) {
*time_code = TIME_WALL;
return 0;
}
p = field;
if (*p == '-') {
p++;
negative = 1;
}
hours = parse_number (data, &p);
if (*p == ':') {
p++;
minutes = parse_number (data, &p);
if (*p == ':') {
p++;
seconds = parse_number (data, &p);
}
}
if (hours < 0 || hours > 24
|| minutes < 0 || minutes > 59
|| seconds < 0 || seconds > 59
|| (hours == 24 && (minutes != 0 || seconds != 0))) {
fprintf (stderr, "%s:%i: Invalid time: %s\n%s\n", data->filename,
data->line_number, field, data->line);
exit (1);
}
if (hours == 24) {
hours = 23;
minutes = 59;
seconds = 59;
}
#if 0
printf ("Time: %s -> %i:%02i:%02i\n", field, hours, minutes, seconds);
#endif
result = hours * 3600 + minutes * 60 + seconds;
if (negative)
result = -result;
if (*p == '\0') {
*time_code = TIME_WALL;
return result;
}
if (*(p + 1) == '\0') {
if (*p == 'w') {
*time_code = TIME_WALL;
return result;
} else if (*p == 's') {
*time_code = TIME_STANDARD;
return result;
} else if (*p == 'u' || *p == 'g' || *p == 'z') {
*time_code = TIME_UNIVERSAL;
return result;
}
}
fprintf (stderr, "%s:%i: Invalid time: %s\n%s\n", data->filename,
data->line_number, field, data->line);
exit (1);
}
/* Parses a simple number and returns the result. The pointer argument
is moved to the first character after the number. */
static int
parse_number (ParsingData *data,
char **num)
{
char *p;
int result;
p = *num;
#if 0
printf ("In parse_number p:%s\n", p);
#endif
if (*p < '0' || *p > '9') {
fprintf (stderr, "%s:%i: Invalid number: %s\n%s\n", data->filename,
data->line_number, *num, data->line);
exit (1);
}
result = *p++ - '0';
while (*p >= '0' && *p <= '9')
result = result * 10 + *p++ - '0';
*num = p;
return result;
}
static int
parse_rules_save (ParsingData *data,
char *field,
char **rules)
{
TimeCode time_code;
*rules = NULL;
/* Check for just "-". */
if (field[0] == '-' && field[1] == '\0')
return 0;
/* Check for a time to add to local standard time. We don't care about a
time code here, since it is just an offset. */
if (*field == '-' || (*field >= '0' && *field <= '9'))
return parse_time (data, field, &time_code);
/* It must be a rules name. */
*rules = g_strdup (field);
return 0;
}
GHashTable*
parse_zone_tab (char *filename)
{
GHashTable *zones_hash;
ZoneDescription *zone_desc;
FILE *fp;
char buf[4096];
gchar **fields, *zone_name, *latitude, *longitude, *p;
fp = fopen (filename, "r");
if (!fp) {
fprintf (stderr, "Couldn't open file: %s\n", filename);
exit (1);
}
zones_hash = g_hash_table_new (g_str_hash, g_str_equal);
while (fgets (buf, sizeof(buf), fp)) {
if (*buf == '#') continue;
g_strchomp (buf);
fields = g_strsplit (buf,"\t", 4);
if (strlen (fields[0]) != 2) {
fprintf (stderr, "Invalid zone description line: %s\n", buf);
exit (1);
}
zone_name = g_strdup (fields[2]);
zone_desc = g_new (ZoneDescription, 1);
zone_desc->country_code[0] = fields[0][0];
zone_desc->country_code[1] = fields[0][1];
zone_desc->comment = (fields[3] && fields[3][0]) ? g_strdup (fields[3])
: NULL;
/* Now parse the latitude and longitude. */
latitude = fields[1];
longitude = latitude + 1;
while (*longitude != '+' && *longitude != '-')
longitude++;
parse_coord (latitude, longitude - latitude, zone_desc->latitude);
parse_coord (longitude, strlen (longitude), zone_desc->longitude);
g_hash_table_insert (zones_hash, zone_name, zone_desc);
#if 0
g_print ("Found zone: %s %i %02i %02i,%i %02i %02i\n", zone_name,
zone_desc->latitude[0], zone_desc->latitude[1],
zone_desc->latitude[2],
zone_desc->longitude[0], zone_desc->longitude[1],
zone_desc->longitude[2]);
#endif
}
fclose (fp);
return zones_hash;
}
static void
parse_coord (char *coord,
int len,
int *result)
{
int degrees = 0, minutes = 0, seconds = 0;
if (len == 5)
sscanf (coord + 1, "%2d%2d", &degrees, &minutes);
else if (len == 6)
sscanf (coord + 1, "%3d%2d", &degrees, &minutes);
else if (len == 7)
sscanf (coord + 1, "%2d%2d%2d", &degrees, &minutes, &seconds);
else if (len == 8)
sscanf (coord + 1, "%3d%2d%2d", &degrees, &minutes, &seconds);
else {
fprintf (stderr, "Invalid coordinate: %s\n", coord);
exit (1);
}
if (coord[0] == '-')
degrees = -degrees;
result[0] = degrees;
result[1] = minutes;
result[2] = seconds;
}
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