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#include <cstddef>
#ifdef __HAIKU__
#include <cstring>
#include <Errors.h>
#include <LocaleRoster.h>
#include <String.h>
#include <TimeZone.h>
extern "C" {
size_t iana_time_zone_haiku_get_tz(char *buf, size_t buf_size) {
try {
static_assert(sizeof(char) == sizeof(uint8_t), "Illegal char size");
if (buf_size == 0) {
return 0;
}
// `BLocaleRoster::Default()` returns a reference to a statically allocated object.
// https://github.com/haiku/haiku/blob/8f16317/src/kits/locale/LocaleRoster.cpp#L143-L147
BLocaleRoster *locale_roster(BLocaleRoster::Default());
if (!locale_roster) {
return 0;
}
BTimeZone tz(NULL, NULL);
if (locale_roster->GetDefaultTimeZone(&tz) != B_OK) {
return 0;
}
BString bname(tz.ID());
int32_t ilength(bname.Length());
if (ilength <= 0) {
return 0;
}
size_t length(ilength);
if (length > buf_size) {
return 0;
}
// BString::String() returns a borrowed string.
// https://www.haiku-os.org/docs/api/classBString.html#ae4fe78b06c8e3310093b80305e14ba87
const char *sname(bname.String());
if (!sname) {
return 0;
}
std::memcpy(buf, sname, length);
return length;
} catch (...) {
return 0;
}
}
} // extern "C"
#else
extern "C" {
size_t iana_time_zone_haiku_get_tz(char *buf, size_t buf_size) { return 0; }
} // extern "C"
#endif
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