diff options
Diffstat (limited to 'src/civetweb/src/third_party/duktape-1.5.2/src-separate/duk_bi_date_unix.c')
| -rw-r--r-- | src/civetweb/src/third_party/duktape-1.5.2/src-separate/duk_bi_date_unix.c | 309 |
1 files changed, 309 insertions, 0 deletions
diff --git a/src/civetweb/src/third_party/duktape-1.5.2/src-separate/duk_bi_date_unix.c b/src/civetweb/src/third_party/duktape-1.5.2/src-separate/duk_bi_date_unix.c new file mode 100644 index 000000000..e1e7c4296 --- /dev/null +++ b/src/civetweb/src/third_party/duktape-1.5.2/src-separate/duk_bi_date_unix.c @@ -0,0 +1,309 @@ +/* + * 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 |