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