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Ultimate improvement of the library #10

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1 change: 1 addition & 0 deletions .gitignore
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Expand Up @@ -12,3 +12,4 @@
build
*.o
example
test/test
8 changes: 7 additions & 1 deletion Makefile
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@@ -1,5 +1,5 @@
CC=gcc
CFLAGS=-I.
CFLAGS=-I. -std=gnu2x -Wall -Wextra -Werror
DEPS = zones.h

UTZ_DATA_DIR = vendor/tzdata
Expand Down Expand Up @@ -35,3 +35,9 @@ example/example: utz.o zones.o examples/example.o

clean:
rm -f zones.h zones.c whitelist.txt utz.o zones.o examples/example.o example

test: test/test
./test/test

test/test: utz.o zones.o test/test.o
$(CC) $(CFLAGS) -o $@ $^ -I.
12 changes: 12 additions & 0 deletions README.md
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Expand Up @@ -27,6 +27,18 @@ packing all possible syntax of the source IANA tz database.
Instead a subset corresponding to the what is needed to correctly parse
most zones is implemented.

## Updating timezone database

1. Install python requirements:
`pip3 install -r requirements.txt`
2. If necessary, update vendor files in vendor/android, vendor/wikipedia, and vendor/tzdata
3. Compile timezone links. To do that you need a [GeoNames](https://www.geonames.org/) username:
`./utils/compile_tzlinks.py -u <username>`
4. Compile whitelisted timezones from the Android file:
`./utils/compile_whitelist.py`
5. Finally, generate the database:
`./utils/generate_zones.py -d vendor/tzdata -w whitelist.txt -i majormetros`

## Links

[zic man page and IANA tz database format documentation](https://linux.die.net/man/8/zic)
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17 changes: 9 additions & 8 deletions examples/example.c
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Expand Up @@ -8,22 +8,23 @@
#include "zones.h"

#include <stdio.h>
void main() {
printf("Total library db size: %d B\n", sizeof(zone_rules) + sizeof(zone_abrevs) + sizeof(zone_defns) + sizeof(zone_names));
int main() {
printf("Total library db size: %d B\n", sizeof(utz_zone_rules) + sizeof(utz_zone_abrevs) + sizeof(utz_zone_defns) + sizeof(utz_zone_names));

udatetime_t dt = {0};
dt.date.year = 17;
utz_datetime_t dt = {0};
dt.date.year = 2017;
dt.date.month = 9;
dt.date.dayofmonth = 26;
dt.time.hour = 1;
dt.time.minute = 0;
dt.time.second = 0;

uzone_t active_zone;
get_zone_by_name("San Francisco", &active_zone);
uoffset_t offset;
char c = get_current_offset(&active_zone, &dt, &offset);
utz_zone_t active_zone;
utz_get_zone_by_name("San Francisco", &active_zone);
utz_offset_t offset;
char c = utz_get_current_offset(&active_zone, &dt, &offset);
printf("%s, current offset: %d.%d\n", active_zone.name, offset.hours, offset.minutes / 60);
printf(active_zone.abrev_formatter, c);
printf("\n");
return 0;
}
8 changes: 5 additions & 3 deletions majormetros
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Expand Up @@ -5,16 +5,19 @@ Link Asia/Kolkata Asia/Delhi
Link Asia/Kolkata Asia/Mumbai
Link Asia/Tokyo Asia/Osaka
Link Asia/Shanghai Asia/Wuhan
Link Asia/Chongqing Asia/Chengdu
Link Asia/Shanghai Asia/Chengdu
Link Asia/Shanghai Asia/Chongqing
Link Asia/Shanghai Asia/Tianjin
Link Asia/Shanghai Asia/Hangzhou
Link Asia/Chongqing Asia/Xi'an
Link Asia/Shanghai Asia/Xi'an
Link Asia/Shanghai Asia/Changzhou
Link America/Sao_Paulo America/Rio_de_Janeiro
Link Asia/Shanghai Asia/Shantou
Link Asia/Shanghai Asia/Nanjing
Link Europe/Berlin Europe/Rhine-Ruhr
Link Asia/Shanghai Asia/Jinan
Link Asia/Kolkata Asia/Bangalore
Link Asia/Shanghai Asia/Harbin
Link Asia/Karachi Asia/Lahore
Link Asia/Shanghai Asia/Zhengzhou
Link Asia/Shanghai Asia/Qingdao
Expand All @@ -24,7 +27,6 @@ Link Asia/Kolkata Asia/Hyderabad
Link Asia/Shanghai Asia/Shenyang
Link Asia/Shanghai Asia/Wenzhou
Link Asia/Shanghai Asia/Nanchang
Link America/Chicago America/DallasFort_Worth
Link America/Chicago America/Houston
Link Asia/Kolkata Asia/Ahmedabad
Link America/New_York America/Washington,_D.C.
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17 changes: 13 additions & 4 deletions requirements.txt
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@@ -1,4 +1,13 @@
BeautifulSoup
click
geopy
tzwhere
appdirs==1.4.4
beautifulsoup4==4.14.3
click==8.3.1
fissix==24.4.24
geographiclib==2.1
geopy==2.4.1
modernize==0.8.0
numpy==2.4.1
pytz==2025.2
shapely==2.1.2
soupsieve==2.8.3
typing_extensions==4.15.0
tzwhere==3.0.3
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