+++ /dev/null
-/*
- * Unix-like Date providers
- *
- * Generally useful Unix / POSIX / ANSI Date providers.
- */
-
-#include "duk_internal.h"
-
-/* The necessary #includes are in place in duk_config.h. */
-
-/* Buffer sizes for some UNIX calls. Larger than strictly necessary
- * to avoid Valgrind errors.
- */
-#define DUK__STRPTIME_BUF_SIZE 64
-#define DUK__STRFTIME_BUF_SIZE 64
-
-#if defined(DUK_USE_DATE_NOW_GETTIMEOFDAY)
-/* Get current Ecmascript time (= UNIX/Posix time, but in milliseconds). */
-DUK_INTERNAL duk_double_t duk_bi_date_get_now_gettimeofday(duk_context *ctx) {
- duk_hthread *thr = (duk_hthread *) ctx;
- struct timeval tv;
- duk_double_t d;
-
- if (gettimeofday(&tv, NULL) != 0) {
- DUK_ERROR_INTERNAL_DEFMSG(thr);
- }
-
- d = ((duk_double_t) tv.tv_sec) * 1000.0 +
- ((duk_double_t) (tv.tv_usec / 1000));
- DUK_ASSERT(DUK_FLOOR(d) == d); /* no fractions */
-
- return d;
-}
-#endif /* DUK_USE_DATE_NOW_GETTIMEOFDAY */
-
-#if defined(DUK_USE_DATE_NOW_TIME)
-/* Not a very good provider: only full seconds are available. */
-DUK_INTERNAL duk_double_t duk_bi_date_get_now_time(duk_context *ctx) {
- time_t t;
-
- DUK_UNREF(ctx);
- t = time(NULL);
- return ((duk_double_t) t) * 1000.0;
-}
-#endif /* DUK_USE_DATE_NOW_TIME */
-
-#if defined(DUK_USE_DATE_TZO_GMTIME) || defined(DUK_USE_DATE_TZO_GMTIME_R)
-/* Get local time offset (in seconds) for a certain (UTC) instant 'd'. */
-DUK_INTERNAL duk_int_t duk_bi_date_get_local_tzoffset_gmtime(duk_double_t d) {
- time_t t, t1, t2;
- duk_int_t parts[DUK_DATE_IDX_NUM_PARTS];
- duk_double_t dparts[DUK_DATE_IDX_NUM_PARTS];
- struct tm tms[2];
-#ifdef DUK_USE_DATE_TZO_GMTIME
- struct tm *tm_ptr;
-#endif
-
- /* For NaN/inf, the return value doesn't matter. */
- if (!DUK_ISFINITE(d)) {
- return 0;
- }
-
- /* If not within Ecmascript range, some integer time calculations
- * won't work correctly (and some asserts will fail), so bail out
- * if so. This fixes test-bug-date-insane-setyear.js. There is
- * a +/- 24h leeway in this range check to avoid a test262 corner
- * case documented in test-bug-date-timeval-edges.js.
- */
- if (!duk_bi_date_timeval_in_leeway_range(d)) {
- DUK_DD(DUK_DDPRINT("timeval not within valid range, skip tzoffset computation to avoid integer overflows"));
- return 0;
- }
-
- /*
- * This is a bit tricky to implement portably. The result depends
- * on the timestamp (specifically, DST depends on the timestamp).
- * If e.g. UNIX APIs are used, they'll have portability issues with
- * very small and very large years.
- *
- * Current approach:
- *
- * - Stay within portable UNIX limits by using equivalent year mapping.
- * Avoid year 1970 and 2038 as some conversions start to fail, at
- * least on some platforms. Avoiding 1970 means that there are
- * currently DST discrepancies for 1970.
- *
- * - Create a UTC and local time breakdowns from 't'. Then create
- * a time_t using gmtime() and localtime() and compute the time
- * difference between the two.
- *
- * Equivalent year mapping (E5 Section 15.9.1.8):
- *
- * If the host environment provides functionality for determining
- * daylight saving time, the implementation of ECMAScript is free
- * to map the year in question to an equivalent year (same
- * leap-year-ness and same starting week day for the year) for which
- * the host environment provides daylight saving time information.
- * The only restriction is that all equivalent years should produce
- * the same result.
- *
- * This approach is quite reasonable but not entirely correct, e.g.
- * the specification also states (E5 Section 15.9.1.8):
- *
- * The implementation of ECMAScript should not try to determine
- * whether the exact time was subject to daylight saving time, but
- * just whether daylight saving time would have been in effect if
- * the _current daylight saving time algorithm_ had been used at the
- * time. This avoids complications such as taking into account the
- * years that the locale observed daylight saving time year round.
- *
- * Since we rely on the platform APIs for conversions between local
- * time and UTC, we can't guarantee the above. Rather, if the platform
- * has historical DST rules they will be applied. This seems to be the
- * general preferred direction in Ecmascript standardization (or at least
- * implementations) anyway, and even the equivalent year mapping should
- * be disabled if the platform is known to handle DST properly for the
- * full Ecmascript range.
- *
- * The following has useful discussion and links:
- *
- * https://bugzilla.mozilla.org/show_bug.cgi?id=351066
- */
-
- duk_bi_date_timeval_to_parts(d, parts, dparts, DUK_DATE_FLAG_EQUIVYEAR /*flags*/);
- DUK_ASSERT(parts[DUK_DATE_IDX_YEAR] >= 1970 && parts[DUK_DATE_IDX_YEAR] <= 2038);
-
- d = duk_bi_date_get_timeval_from_dparts(dparts, 0 /*flags*/);
- DUK_ASSERT(d >= 0 && d < 2147483648.0 * 1000.0); /* unsigned 31-bit range */
- t = (time_t) (d / 1000.0);
- DUK_DDD(DUK_DDDPRINT("timeval: %lf -> time_t %ld", (double) d, (long) t));
-
- DUK_MEMZERO((void *) tms, sizeof(struct tm) * 2);
-
-#if defined(DUK_USE_DATE_TZO_GMTIME_R)
- (void) gmtime_r(&t, &tms[0]);
- (void) localtime_r(&t, &tms[1]);
-#elif defined(DUK_USE_DATE_TZO_GMTIME)
- tm_ptr = gmtime(&t);
- DUK_MEMCPY((void *) &tms[0], tm_ptr, sizeof(struct tm));
- tm_ptr = localtime(&t);
- DUK_MEMCPY((void *) &tms[1], tm_ptr, sizeof(struct tm));
-#else
-#error internal error
-#endif
- DUK_DDD(DUK_DDDPRINT("gmtime result: tm={sec:%ld,min:%ld,hour:%ld,mday:%ld,mon:%ld,year:%ld,"
- "wday:%ld,yday:%ld,isdst:%ld}",
- (long) tms[0].tm_sec, (long) tms[0].tm_min, (long) tms[0].tm_hour,
- (long) tms[0].tm_mday, (long) tms[0].tm_mon, (long) tms[0].tm_year,
- (long) tms[0].tm_wday, (long) tms[0].tm_yday, (long) tms[0].tm_isdst));
- DUK_DDD(DUK_DDDPRINT("localtime result: tm={sec:%ld,min:%ld,hour:%ld,mday:%ld,mon:%ld,year:%ld,"
- "wday:%ld,yday:%ld,isdst:%ld}",
- (long) tms[1].tm_sec, (long) tms[1].tm_min, (long) tms[1].tm_hour,
- (long) tms[1].tm_mday, (long) tms[1].tm_mon, (long) tms[1].tm_year,
- (long) tms[1].tm_wday, (long) tms[1].tm_yday, (long) tms[1].tm_isdst));
-
- /* tm_isdst is both an input and an output to mktime(), use 0 to
- * avoid DST handling in mktime():
- * - https://github.com/svaarala/duktape/issues/406
- * - http://stackoverflow.com/questions/8558919/mktime-and-tm-isdst
- */
- tms[0].tm_isdst = 0;
- tms[1].tm_isdst = 0;
- t1 = mktime(&tms[0]); /* UTC */
- t2 = mktime(&tms[1]); /* local */
- if (t1 == (time_t) -1 || t2 == (time_t) -1) {
- /* This check used to be for (t < 0) but on some platforms
- * time_t is unsigned and apparently the proper way to detect
- * an mktime() error return is the cast above. See e.g.:
- * http://pubs.opengroup.org/onlinepubs/009695299/functions/mktime.html
- */
- goto error;
- }
- DUK_DDD(DUK_DDDPRINT("t1=%ld (utc), t2=%ld (local)", (long) t1, (long) t2));
-
- /* Compute final offset in seconds, positive if local time ahead of
- * UTC (returned value is UTC-to-local offset).
- *
- * difftime() returns a double, so coercion to int generates quite
- * a lot of code. Direct subtraction is not portable, however.
- * XXX: allow direct subtraction on known platforms.
- */
-#if 0
- return (duk_int_t) (t2 - t1);
-#endif
- return (duk_int_t) difftime(t2, t1);
-
- error:
- /* XXX: return something more useful, so that caller can throw? */
- DUK_D(DUK_DPRINT("mktime() failed, d=%lf", (double) d));
- return 0;
-}
-#endif /* DUK_USE_DATE_TZO_GMTIME */
-
-#if defined(DUK_USE_DATE_PRS_STRPTIME)
-DUK_INTERNAL duk_bool_t duk_bi_date_parse_string_strptime(duk_context *ctx, const char *str) {
- struct tm tm;
- time_t t;
- char buf[DUK__STRPTIME_BUF_SIZE];
-
- /* copy to buffer with spare to avoid Valgrind gripes from strptime */
- DUK_ASSERT(str != NULL);
- DUK_MEMZERO(buf, sizeof(buf)); /* valgrind whine without this */
- DUK_SNPRINTF(buf, sizeof(buf), "%s", (const char *) str);
- buf[sizeof(buf) - 1] = (char) 0;
-
- DUK_DDD(DUK_DDDPRINT("parsing: '%s'", (const char *) buf));
-
- DUK_MEMZERO(&tm, sizeof(tm));
- if (strptime((const char *) buf, "%c", &tm) != NULL) {
- DUK_DDD(DUK_DDDPRINT("before mktime: tm={sec:%ld,min:%ld,hour:%ld,mday:%ld,mon:%ld,year:%ld,"
- "wday:%ld,yday:%ld,isdst:%ld}",
- (long) tm.tm_sec, (long) tm.tm_min, (long) tm.tm_hour,
- (long) tm.tm_mday, (long) tm.tm_mon, (long) tm.tm_year,
- (long) tm.tm_wday, (long) tm.tm_yday, (long) tm.tm_isdst));
- tm.tm_isdst = -1; /* negative: dst info not available */
-
- t = mktime(&tm);
- DUK_DDD(DUK_DDDPRINT("mktime() -> %ld", (long) t));
- if (t >= 0) {
- duk_push_number(ctx, ((duk_double_t) t) * 1000.0);
- return 1;
- }
- }
-
- return 0;
-}
-#endif /* DUK_USE_DATE_PRS_STRPTIME */
-
-#if defined(DUK_USE_DATE_PRS_GETDATE)
-DUK_INTERNAL duk_bool_t duk_bi_date_parse_string_getdate(duk_context *ctx, const char *str) {
- struct tm tm;
- duk_small_int_t rc;
- time_t t;
-
- /* For this to work, DATEMSK must be set, so this is not very
- * convenient for an embeddable interpreter.
- */
-
- DUK_MEMZERO(&tm, sizeof(struct tm));
- rc = (duk_small_int_t) getdate_r(str, &tm);
- DUK_DDD(DUK_DDDPRINT("getdate_r() -> %ld", (long) rc));
-
- if (rc == 0) {
- t = mktime(&tm);
- DUK_DDD(DUK_DDDPRINT("mktime() -> %ld", (long) t));
- if (t >= 0) {
- duk_push_number(ctx, (duk_double_t) t);
- return 1;
- }
- }
-
- return 0;
-}
-#endif /* DUK_USE_DATE_PRS_GETDATE */
-
-#if defined(DUK_USE_DATE_FMT_STRFTIME)
-DUK_INTERNAL duk_bool_t duk_bi_date_format_parts_strftime(duk_context *ctx, duk_int_t *parts, duk_int_t tzoffset, duk_small_uint_t flags) {
- char buf[DUK__STRFTIME_BUF_SIZE];
- struct tm tm;
- const char *fmt;
-
- DUK_UNREF(tzoffset);
-
- /* If the platform doesn't support the entire Ecmascript range, we need
- * to return 0 so that the caller can fall back to the default formatter.
- *
- * For now, assume that if time_t is 8 bytes or more, the whole Ecmascript
- * range is supported. For smaller time_t values (4 bytes in practice),
- * assumes that the signed 32-bit range is supported.
- *
- * XXX: detect this more correctly per platform. The size of time_t is
- * probably not an accurate guarantee of strftime() supporting or not
- * supporting a large time range (the full Ecmascript range).
- */
- if (sizeof(time_t) < 8 &&
- (parts[DUK_DATE_IDX_YEAR] < 1970 || parts[DUK_DATE_IDX_YEAR] > 2037)) {
- /* be paranoid for 32-bit time values (even avoiding negative ones) */
- return 0;
- }
-
- DUK_MEMZERO(&tm, sizeof(tm));
- tm.tm_sec = parts[DUK_DATE_IDX_SECOND];
- tm.tm_min = parts[DUK_DATE_IDX_MINUTE];
- tm.tm_hour = parts[DUK_DATE_IDX_HOUR];
- tm.tm_mday = parts[DUK_DATE_IDX_DAY]; /* already one-based */
- tm.tm_mon = parts[DUK_DATE_IDX_MONTH] - 1; /* one-based -> zero-based */
- tm.tm_year = parts[DUK_DATE_IDX_YEAR] - 1900;
- tm.tm_wday = parts[DUK_DATE_IDX_WEEKDAY];
- tm.tm_isdst = 0;
-
- DUK_MEMZERO(buf, sizeof(buf));
- if ((flags & DUK_DATE_FLAG_TOSTRING_DATE) && (flags & DUK_DATE_FLAG_TOSTRING_TIME)) {
- fmt = "%c";
- } else if (flags & DUK_DATE_FLAG_TOSTRING_DATE) {
- fmt = "%x";
- } else {
- DUK_ASSERT(flags & DUK_DATE_FLAG_TOSTRING_TIME);
- fmt = "%X";
- }
- (void) strftime(buf, sizeof(buf) - 1, fmt, &tm);
- DUK_ASSERT(buf[sizeof(buf) - 1] == 0);
-
- duk_push_string(ctx, buf);
- return 1;
-}
-#endif /* DUK_USE_DATE_FMT_STRFTIME */
-
-#undef DUK__STRPTIME_BUF_SIZE
-#undef DUK__STRFTIME_BUF_SIZE
projects / ceph.git / blobdiff