NEWS
zufast 0.1.1
zufast/datetime.h: ISO 8601 week dates. zuf_weekday_from_days(),
zuf_iso_week_from_days() (week-numbering year and week),
zuf_iso_weeks_in_year() and the inverse zuf_days_from_iso_week(), exact
over the whole int32_t day range. Week dates are computed, not parsed.zufast/datetime.h: zuf_parse_date_opt() and zuf_parse_datetime_opt()
take flags. ZUF_DT_EXPANDED_YEAR accepts expanded years, a sign and
exactly six digits as in Temporal (+010000-01-01, -271821-04-20), and
rejects -000000. zuf_parse_date() and zuf_parse_datetime() keep the
four-digit grammar.- Breaking change for years outside 0000 to 9999:
zuf_format_date(),
zuf_format_datetime() and fast_format_datetime() now pad expanded years
to six digits (+010000-01-01, -000001-01-01), where 0.1.0 padded to
five. The formatters now write the form that Temporal writes and that
ZUF_DT_EXPANDED_YEAR reads. Years 0000 to 9999 are unchanged.
- New
zufast/wide.h: 128-bit integers zuf_i128 and zuf_u128, for
Temporal's epoch nanoseconds and durations in zutempo and for zuint. Both
are two-word structs in every build. The header offers checked and
wrapping add, subtract and multiply, the full 64 x 64 bit products,
truncating and floor division by a 64- or 128-bit divisor, exact
conversion to and from double, and decimal parsing and writing. The
native __int128 is used inside the functions where the compiler has it.
Defining ZUF_NO_INT128 selects the portable code, and the test suite
checks that both give identical results.
zufast 0.1.0 (2026-10-21)
- Initial CRAN release: a header-only library of small, fast, portable C99
primitives, used by other packages through
LinkingTo: zufast alone.
zufast/number.h: correctly rounded parsing of double, float and
32/64-bit integers in any base 2 to 36 (with a JSON mode), through the
vendored ffc.h, a C port of fast_float; shortest round-trip formatting in
ECMAScript notation through the vendored Ryu; exact fixed-notation
formatting and integer writers.zufast/datetime.h: ISO 8601 / RFC 3339 date and timestamp parsing to
fields, calendar arithmetic exact over the whole int32_t day range, and
RFC 3339 formatting.zufast/literal.h (booleans with per-spelling flags, literal matching,
ASCII whitespace), zufast/uuid.h, zufast/hex.h and zufast/base64.h
(strict, standard and URL alphabets), zufast/hash.h (XXH3 64- and
128-bit, one-shot and streaming, through the vendored xxHash),
zufast/bits.h (binary16, bfloat16, endian helpers) and zufast/utf8.h
(UTF-8 validation and code-point counting).- R functions that exercise the C layer:
fast_parse_double(),
fast_parse_integer(), fast_format_double(), fast_parse_date(),
fast_parse_datetime(), fast_datetime_fields(),
fast_format_datetime(), fast_hex_encode(), fast_hex_decode(),
fast_base64_encode(), fast_base64_decode(), fast_hash(),
fast_utf8_valid() and fast_info().
vignette("linking") gives the consumer recipe.