/** * get_local_timezone_ofs: * @when: time in UTC * * Return the zone offset (measured in seconds) of @when expressed in local * time. The function also takes care about daylight saving. **/ long get_local_timezone_ofs(time_t when) { #ifdef HAVE_STRUCT_TM_TM_GMTOFF struct tm ltm; cached_localtime(&when, <m); return ltm.tm_gmtoff; #else struct tm gtm; struct tm ltm; long tzoff; cached_localtime(&when, <m); cached_gmtime(&when, >m); tzoff = (ltm.tm_hour - gtm.tm_hour) * 3600; tzoff += (ltm.tm_min - gtm.tm_min) * 60; tzoff += ltm.tm_sec - gtm.tm_sec; if (tzoff > 0 && (ltm.tm_year < gtm.tm_year || ltm.tm_mon < gtm.tm_mon || ltm.tm_mday < gtm.tm_mday)) tzoff -= 86400; else if (tzoff < 0 && (ltm.tm_year > gtm.tm_year || ltm.tm_mon > gtm.tm_mon || ltm.tm_mday > gtm.tm_mday)) tzoff += 86400; return tzoff; #endif /* HAVE_STRUCT_TM_TM_GMTOFF */ }
static gboolean _parse_timestamp(SnmpTrapdHeaderParser *self) { GTimeVal now; cached_g_current_time(&now); time_t now_tv_sec = (time_t) now.tv_sec; LogStamp *stamp = &self->nv_context->msg->timestamps[LM_TS_STAMP]; stamp->tv_usec = 0; stamp->zone_offset = -1; /* NOTE: we initialize various unportable fields in tm using a * localtime call, as the value of tm_gmtoff does matter but it does * not exist on all platforms and 0 initializing it causes trouble on * time-zone barriers */ struct tm tm; cached_localtime(&now_tv_sec, &tm); if (!scan_std_timestamp(self->input, (gint *)self->input_len, &tm)) return FALSE; tm.tm_isdst = -1; stamp->tv_sec = cached_mktime(&tm); stamp->zone_offset = get_local_timezone_ofs(stamp->tv_sec); return TRUE; }
static gchar * msg_format_timestamp(gchar *buf, gsize buflen) { struct tm tm; GTimeVal now; gint len; time_t now_sec; g_get_current_time(&now); now_sec = now.tv_sec; cached_localtime(&now_sec, &tm); len = strftime(buf, buflen, "%Y-%m-%dT%H:%M:%S", &tm); if (len < buflen) g_snprintf(buf + len, buflen - len, ".%06ld", now.tv_usec); return buf; }
static gboolean __parse_bsd_timestamp(const guchar **data, gint *length, const GTimeVal *now, struct tm* tm, glong *usec) { gint left = *length; const guchar *src = *data; time_t now_tv_sec = (time_t) now->tv_sec; cached_localtime(&now_tv_sec, tm); if (__is_bsd_pix_or_asa(src, left)) { if (!scan_pix_timestamp((const gchar **) &src, &left, tm)) return FALSE; if (*src == ':') { src++; left--; } } else if (__is_bsd_linksys(src, left)) { if (!scan_linksys_timestamp((const gchar **) &src, &left, tm)) return FALSE; } else if (__is_bsd_rfc_3164(src, left)) { if (!scan_bsd_timestamp((const gchar **) &src, &left, tm)) return FALSE; *usec = __parse_usec(&src, &left); tm->tm_year = determine_year_for_month(tm->tm_mon, tm); } else { return FALSE; } *data = src; *length = left; return TRUE; }
static gboolean __parse_iso_stamp(const GTimeVal *now, LogMessage *self, struct tm* tm, const guchar **data, gint *length) { /* RFC3339 timestamp, expected format: YYYY-MM-DDTHH:MM:SS[.frac]<+/->ZZ:ZZ */ time_t now_tv_sec = (time_t) now->tv_sec; const guchar *src = *data; self->timestamps[LM_TS_STAMP].tv_usec = 0; /* NOTE: we initialize various unportable fields in tm using a * localtime call, as the value of tm_gmtoff does matter but it does * not exist on all platforms and 0 initializing it causes trouble on * time-zone barriers */ cached_localtime(&now_tv_sec, tm); if (!scan_iso_timestamp((const gchar **) &src, length, tm)) { return FALSE; } self->timestamps[LM_TS_STAMP].tv_usec = __parse_usec(&src, length); if (*length > 0 && *src == 'Z') { /* Z is special, it means UTC */ self->timestamps[LM_TS_STAMP].zone_offset = 0; src++; (*length)--; } else if (__has_iso_timezone(src, *length)) { self->timestamps[LM_TS_STAMP].zone_offset = __parse_iso_timezone(&src, length); } *data = src; return TRUE; }
/* FIXME: this function should really be exploded to a lot of smaller functions... (Bazsi) */ static gboolean log_msg_parse_date(LogMessage *self, const guchar **data, gint *length, guint parse_flags, glong assume_timezone) { const guchar *src = *data; gint left = *length; GTimeVal now; struct tm tm; gint unnormalized_hour; cached_g_current_time(&now); if ((parse_flags & LP_SYSLOG_PROTOCOL) == 0) { /* Cisco timestamp extensions, the first '*' indicates that the clock is * unsynced, '.' if it is known to be synced */ if (G_UNLIKELY(src[0] == '*')) { log_msg_set_value(self, is_synced, "0", 1); src++; left--; } else if (G_UNLIKELY(src[0] == '.')) { log_msg_set_value(self, is_synced, "1", 1); src++; left--; } } /* If the next chars look like a date, then read them as a date. */ if (left >= 19 && src[4] == '-' && src[7] == '-' && src[10] == 'T' && src[13] == ':' && src[16] == ':') { /* RFC3339 timestamp, expected format: YYYY-MM-DDTHH:MM:SS[.frac]<+/->ZZ:ZZ */ gint hours, mins; time_t now_tv_sec = (time_t)now.tv_sec; self->timestamps[LM_TS_STAMP].tv_usec = 0; /* NOTE: we initialize various unportable fields in tm using a * localtime call, as the value of tm_gmtoff does matter but it does * not exist on all platforms and 0 initializing it causes trouble on * time-zone barriers */ cached_localtime(&now_tv_sec, &tm); if (!scan_iso_timestamp((const gchar **) &src, &left, &tm)) { goto error; } self->timestamps[LM_TS_STAMP].tv_usec = 0; if (left > 0 && *src == '.') { gulong frac = 0; gint div = 1; /* process second fractions */ src++; left--; while (left > 0 && div < 10e5 && isdigit(*src)) { frac = 10 * frac + (*src) - '0'; div = div * 10; src++; left--; } while (isdigit(*src)) { src++; left--; } self->timestamps[LM_TS_STAMP].tv_usec = frac * (1000000 / div); } if (left > 0 && *src == 'Z') { /* Z is special, it means UTC */ self->timestamps[LM_TS_STAMP].zone_offset = 0; src++; left--; } else if (left >= 5 && (*src == '+' || *src == '-') && isdigit(*(src+1)) && isdigit(*(src+2)) && *(src+3) == ':' && isdigit(*(src+4)) && isdigit(*(src+5)) && !isdigit(*(src+6))) { /* timezone offset */ gint sign = *src == '-' ? -1 : 1; hours = (*(src+1) - '0') * 10 + *(src+2) - '0'; mins = (*(src+4) - '0') * 10 + *(src+5) - '0'; self->timestamps[LM_TS_STAMP].zone_offset = sign * (hours * 3600 + mins * 60); src += 6; left -= 6; } /* we convert it to UTC */ tm.tm_isdst = -1; unnormalized_hour = tm.tm_hour; self->timestamps[LM_TS_STAMP].tv_sec = cached_mktime(&tm); } else if ((parse_flags & LP_SYSLOG_PROTOCOL) == 0) { if (left >= 21 && src[3] == ' ' && src[6] == ' ' && src[11] == ' ' && src[14] == ':' && src[17] == ':' && (src[20] == ':' || src[20] == ' ') && (isdigit(src[7]) && isdigit(src[8]) && isdigit(src[9]) && isdigit(src[10]))) { /* PIX timestamp, expected format: MMM DD YYYY HH:MM:SS: */ /* ASA timestamp, expected format: MMM DD YYYY HH:MM:SS */ time_t now_tv_sec = (time_t)now.tv_sec; cached_localtime(&now_tv_sec, &tm); if (!scan_pix_timestamp((const gchar **) &src, &left, &tm)) goto error; if (*src == ':') { src++; left--; } tm.tm_isdst = -1; /* NOTE: no timezone information in the message, assume it is local time */ unnormalized_hour = tm.tm_hour; self->timestamps[LM_TS_STAMP].tv_sec = cached_mktime(&tm); self->timestamps[LM_TS_STAMP].tv_usec = 0; } else if (left >= 21 && src[3] == ' ' && src[6] == ' ' && src[9] == ':' && src[12] == ':' && src[15] == ' ' && isdigit(src[16]) && isdigit(src[17]) && isdigit(src[18]) && isdigit(src[19]) && isspace(src[20])) { /* LinkSys timestamp, expected format: MMM DD HH:MM:SS YYYY */ time_t now_tv_sec = (time_t)now.tv_sec; cached_localtime(&now_tv_sec, &tm); if (!scan_linksys_timestamp((const gchar **) &src, &left, &tm)) goto error; tm.tm_isdst = -1; /* NOTE: no timezone information in the message, assume it is local time */ unnormalized_hour = tm.tm_hour; self->timestamps[LM_TS_STAMP].tv_sec = cached_mktime(&tm); self->timestamps[LM_TS_STAMP].tv_usec = 0; } else if (left >= 15 && src[3] == ' ' && src[6] == ' ' && src[9] == ':' && src[12] == ':') { /* RFC 3164 timestamp, expected format: MMM DD HH:MM:SS ... */ struct tm nowtm; glong usec = 0; time_t now_tv_sec = (time_t)now.tv_sec; cached_localtime(&now_tv_sec, &nowtm); tm = nowtm; if (!scan_bsd_timestamp((const gchar **) &src, &left, &tm)) goto error; if (left > 0 && src[0] == '.') { gulong frac = 0; gint div = 1; gint i = 1; /* gee, funny Cisco extension, BSD timestamp with fraction of second support */ while (i < left && div < 10e5 && isdigit(src[i])) { frac = 10 * frac + (src[i]) - '0'; div = div * 10; i++; } while (i < left && isdigit(src[i])) i++; usec = frac * (1000000 / div); left -= i; src += i; } /* detect if the message is coming from last year. If current * month is January, and the message comes from December, the * year of the message is inferred to be last year. * Conversely, if current month is December, and message comes * from January, year of message is inferred to be next year. */ if (tm.tm_mon == 11 && nowtm.tm_mon == 0) tm.tm_year--; else if (tm.tm_mon == 0 && nowtm.tm_mon == 11) tm.tm_year++; /* NOTE: no timezone information in the message, assume it is local time */ unnormalized_hour = tm.tm_hour; self->timestamps[LM_TS_STAMP].tv_sec = cached_mktime(&tm); self->timestamps[LM_TS_STAMP].tv_usec = usec; } else { goto error; } } else { if (left >= 1 && src[0] == '-') { /* NILVALUE */ self->timestamps[LM_TS_STAMP] = self->timestamps[LM_TS_RECVD]; *length = --left; *data = ++src; return TRUE; } else return FALSE; } /* NOTE: mktime() returns the time assuming that the timestamp we * received was in local time. This is not true, as there's a * zone_offset in the timestamp as well. We need to adjust this offset * by adding the local timezone offset at the specific time to get UTC, * which means that tv_sec becomes as if tm was in the 00:00 timezone. * Also we have to take into account that at the zone barriers an hour * might be skipped or played twice this is what the * (tm.tm_hour - * unnormalized_hour) part fixes up. */ if (self->timestamps[LM_TS_STAMP].zone_offset == -1) { self->timestamps[LM_TS_STAMP].zone_offset = assume_timezone; } if (self->timestamps[LM_TS_STAMP].zone_offset == -1) { self->timestamps[LM_TS_STAMP].zone_offset = get_local_timezone_ofs(self->timestamps[LM_TS_STAMP].tv_sec); } self->timestamps[LM_TS_STAMP].tv_sec = self->timestamps[LM_TS_STAMP].tv_sec + get_local_timezone_ofs(self->timestamps[LM_TS_STAMP].tv_sec) - (tm.tm_hour - unnormalized_hour) * 3600 - self->timestamps[LM_TS_STAMP].zone_offset; *data = src; *length = left; return TRUE; error: /* no recognizable timestamp, use current time */ self->timestamps[LM_TS_STAMP] = self->timestamps[LM_TS_RECVD]; return FALSE; }
/* standard strptime() doesn't support %z / %Z properly on all * platforms, especially those that don't have tm_gmtoff/tm_zone in * their struct tm. This is a slightly modified NetBSD strptime() with * some modifications and explicit zone related parameters. */ char * strptime_with_tz(const char *buf, const char *fmt, struct tm *tm, long *tm_gmtoff, const char **tm_zone) { unsigned char c; const unsigned char *bp, *ep; int alt_format, i, split_year = 0, neg = 0, state = 0, day_offset = -1, week_offset = 0, offs; const char *new_fmt; bp = (const u_char *)buf; while (bp != NULL && (c = *fmt++) != '\0') { /* Clear `alternate' modifier prior to new conversion. */ alt_format = 0; i = 0; /* Eat up white-space. */ if (isspace(c)) { while (isspace(*bp)) bp++; continue; } if (c != '%') goto literal; again: switch (c = *fmt++) { case '%': /* "%%" is converted to "%". */ literal: if (c != *bp++) return NULL; LEGAL_ALT(0); continue; /* * "Alternative" modifiers. Just set the appropriate flag * and start over again. */ case 'E': /* "%E?" alternative conversion modifier. */ LEGAL_ALT(0); alt_format |= ALT_E; goto again; case 'O': /* "%O?" alternative conversion modifier. */ LEGAL_ALT(0); alt_format |= ALT_O; goto again; /* * "Complex" conversion rules, implemented through recursion. */ case 'c': /* Date and time, using the locale's format. */ new_fmt = _TIME_LOCALE(loc)->d_t_fmt; state |= S_WDAY | S_MON | S_MDAY | S_YEAR; goto recurse; case 'D': /* The date as "%m/%d/%y". */ new_fmt = "%m/%d/%y"; LEGAL_ALT(0); state |= S_MON | S_MDAY | S_YEAR; goto recurse; case 'F': /* The date as "%Y-%m-%d". */ new_fmt = "%Y-%m-%d"; LEGAL_ALT(0); state |= S_MON | S_MDAY | S_YEAR; goto recurse; case 'R': /* The time as "%H:%M". */ new_fmt = "%H:%M"; LEGAL_ALT(0); goto recurse; case 'r': /* The time in 12-hour clock representation. */ new_fmt = _TIME_LOCALE(loc)->t_fmt_ampm; LEGAL_ALT(0); goto recurse; case 'T': /* The time as "%H:%M:%S". */ new_fmt = "%H:%M:%S"; LEGAL_ALT(0); goto recurse; case 'X': /* The time, using the locale's format. */ new_fmt = _TIME_LOCALE(loc)->t_fmt; goto recurse; case 'x': /* The date, using the locale's format. */ new_fmt = _TIME_LOCALE(loc)->d_fmt; state |= S_MON | S_MDAY | S_YEAR; recurse: bp = (const u_char *)strptime_with_tz((const char *)bp, new_fmt, tm, tm_gmtoff, tm_zone); LEGAL_ALT(ALT_E); continue; /* * "Elementary" conversion rules. */ case 'A': /* The day of week, using the locale's form. */ case 'a': bp = find_string(bp, &tm->tm_wday, _TIME_LOCALE(loc)->day, _TIME_LOCALE(loc)->abday, 7); LEGAL_ALT(0); state |= S_WDAY; continue; case 'B': /* The month, using the locale's form. */ case 'b': case 'h': bp = find_string(bp, &tm->tm_mon, _TIME_LOCALE(loc)->mon, _TIME_LOCALE(loc)->abmon, 12); LEGAL_ALT(0); state |= S_MON; continue; case 'C': /* The century number. */ i = 20; bp = conv_num(bp, &i, 0, 99); i = i * 100 - TM_YEAR_BASE; if (split_year) i += tm->tm_year % 100; split_year = 1; tm->tm_year = i; LEGAL_ALT(ALT_E); state |= S_YEAR; continue; case 'd': /* The day of month. */ case 'e': bp = conv_num(bp, &tm->tm_mday, 1, 31); LEGAL_ALT(ALT_O); state |= S_MDAY; continue; case 'k': /* The hour (24-hour clock representation). */ LEGAL_ALT(0); /* FALLTHROUGH */ case 'H': bp = conv_num(bp, &tm->tm_hour, 0, 23); LEGAL_ALT(ALT_O); state |= S_HOUR; continue; case 'l': /* The hour (12-hour clock representation). */ LEGAL_ALT(0); /* FALLTHROUGH */ case 'I': bp = conv_num(bp, &tm->tm_hour, 1, 12); if (tm->tm_hour == 12) tm->tm_hour = 0; LEGAL_ALT(ALT_O); state |= S_HOUR; continue; case 'j': /* The day of year. */ i = 1; bp = conv_num(bp, &i, 1, 366); tm->tm_yday = i - 1; LEGAL_ALT(0); state |= S_YDAY; continue; case 'M': /* The minute. */ bp = conv_num(bp, &tm->tm_min, 0, 59); LEGAL_ALT(ALT_O); continue; case 'm': /* The month. */ i = 1; bp = conv_num(bp, &i, 1, 12); tm->tm_mon = i - 1; LEGAL_ALT(ALT_O); state |= S_MON; continue; case 'p': /* The locale's equivalent of AM/PM. */ bp = find_string(bp, &i, _TIME_LOCALE(loc)->am_pm, NULL, 2); if (HAVE_HOUR(state) && tm->tm_hour > 11) return NULL; tm->tm_hour += i * 12; LEGAL_ALT(0); continue; case 'S': /* The seconds. */ bp = conv_num(bp, &tm->tm_sec, 0, 61); LEGAL_ALT(ALT_O); continue; #ifndef TIME_MAX #define TIME_MAX INT64_MAX #endif case 's': /* seconds since the epoch */ { time_t sse = 0; uint64_t rulim = TIME_MAX; if (*bp < '0' || *bp > '9') { bp = NULL; continue; } do { sse *= 10; sse += *bp++ - '0'; rulim /= 10; } while ((sse * 10 <= TIME_MAX) && rulim && *bp >= '0' && *bp <= '9'); if (sse < 0 || (uint64_t)sse > TIME_MAX) { bp = NULL; continue; } cached_localtime(&sse, tm); state |= S_YDAY | S_WDAY | S_MON | S_MDAY | S_YEAR; } continue; case 'U': /* The week of year, beginning on sunday. */ case 'W': /* The week of year, beginning on monday. */ /* * XXX This is bogus, as we can not assume any valid * information present in the tm structure at this * point to calculate a real value, so just check the * range for now. */ bp = conv_num(bp, &i, 0, 53); LEGAL_ALT(ALT_O); if (c == 'U') day_offset = TM_SUNDAY; else day_offset = TM_MONDAY; week_offset = i; continue; case 'w': /* The day of week, beginning on sunday. */ bp = conv_num(bp, &tm->tm_wday, 0, 6); LEGAL_ALT(ALT_O); state |= S_WDAY; continue; case 'u': /* The day of week, monday = 1. */ bp = conv_num(bp, &i, 1, 7); tm->tm_wday = i % 7; LEGAL_ALT(ALT_O); state |= S_WDAY; continue; case 'g': /* The year corresponding to the ISO week * number but without the century. */ bp = conv_num(bp, &i, 0, 99); continue; case 'G': /* The year corresponding to the ISO week * number with century. */ do bp++; while (isdigit(*bp)); continue; case 'V': /* The ISO 8601:1988 week number as decimal */ bp = conv_num(bp, &i, 0, 53); continue; case 'Y': /* The year. */ i = TM_YEAR_BASE; /* just for data sanity... */ bp = conv_num(bp, &i, 0, 9999); tm->tm_year = i - TM_YEAR_BASE; LEGAL_ALT(ALT_E); state |= S_YEAR; continue; case 'y': /* The year within 100 years of the epoch. */ /* LEGAL_ALT(ALT_E | ALT_O); */ bp = conv_num(bp, &i, 0, 99); if (split_year) /* preserve century */ i += (tm->tm_year / 100) * 100; else { split_year = 1; if (i <= 68) i = i + 2000 - TM_YEAR_BASE; else i = i + 1900 - TM_YEAR_BASE; } tm->tm_year = i; state |= S_YEAR; continue; case 'Z': tzset(); if (strncmp((const char *)bp, gmt, 3) == 0 || strncmp((const char *)bp, utc, 3) == 0) { tm->tm_isdst = 0; *tm_gmtoff = 0; *tm_zone = gmt; bp += 3; } else { ep = find_string(bp, &i, (const char * const *)tzname, NULL, 2); if (ep != NULL) { tm->tm_isdst = i; *tm_gmtoff = -(timezone); *tm_zone = tzname[i]; } bp = ep; } continue; case 'z': /* * We recognize all ISO 8601 formats: * Z = Zulu time/UTC * [+-]hhmm * [+-]hh:mm * [+-]hh * We recognize all RFC-822/RFC-2822 formats: * UT|GMT * North American : UTC offsets * E[DS]T = Eastern : -4 | -5 * C[DS]T = Central : -5 | -6 * M[DS]T = Mountain: -6 | -7 * P[DS]T = Pacific : -7 | -8 * Military * [A-IL-M] = -1 ... -9 (J not used) * [N-Y] = +1 ... +12 */ while (isspace(*bp)) bp++; switch (*bp++) { case 'G': if (*bp++ != 'M') return NULL; /*FALLTHROUGH*/ case 'U': if (*bp++ != 'T') return NULL; /*FALLTHROUGH*/ case 'Z': tm->tm_isdst = 0; *tm_gmtoff = 0; *tm_zone = utc; continue; case '+': neg = 0; break; case '-': neg = 1; break; default: --bp; ep = find_string(bp, &i, nast, NULL, 4); if (ep != NULL) { *tm_gmtoff = (-5 - i) * 3600; *tm_zone = __UNCONST(nast[i]); bp = ep; continue; } ep = find_string(bp, &i, nadt, NULL, 4); if (ep != NULL) { tm->tm_isdst = 1; *tm_gmtoff = (-4 - i) * 3600; *tm_zone = __UNCONST(nadt[i]); bp = ep; continue; } if ((*bp >= 'A' && *bp <= 'I') || (*bp >= 'L' && *bp <= 'Y')) { /* Argh! No 'J'! */ if (*bp >= 'A' && *bp <= 'I') *tm_gmtoff = (('A' - 1) - (int)*bp) * 3600; else if (*bp >= 'L' && *bp <= 'M') *tm_gmtoff = ('A' - (int)*bp) * 3600; else if (*bp >= 'N' && *bp <= 'Y') *tm_gmtoff = ((int)*bp - 'M') * 3600; *tm_zone = utc; /* XXX */ bp++; continue; } return NULL; } offs = 0; for (i = 0; i < 4; ) { if (isdigit(*bp)) { offs = offs * 10 + (*bp++ - '0'); i++; continue; } if (i == 2 && *bp == ':') { bp++; continue; } break; } switch (i) { case 2: offs *= 100; break; case 4: i = offs % 100; if (i >= 60) return NULL; /* Convert minutes into decimal */ offs = (offs / 100) * 100 + (i * 50) / 30; break; default: return NULL; } if (neg) offs = -offs; tm->tm_isdst = 0; /* XXX */ *tm_gmtoff = (offs * 3600) / 100; *tm_zone = utc; /* XXX */ continue; /* * Miscellaneous conversions. */ case 'n': /* Any kind of white-space. */ case 't': while (isspace(*bp)) bp++; LEGAL_ALT(0); continue; default: /* Unknown/unsupported conversion. */ return NULL; } } if (!HAVE_YDAY(state) && HAVE_YEAR(state)) { if (HAVE_MON(state) && HAVE_MDAY(state)) { /* calculate day of year (ordinal date) */ tm->tm_yday = start_of_month[isleap_sum(tm->tm_year, TM_YEAR_BASE)][tm->tm_mon] + (tm->tm_mday - 1); state |= S_YDAY; } else if (day_offset != -1) { /* * Set the date to the first Sunday (or Monday) * of the specified week of the year. */ if (!HAVE_WDAY(state)) { tm->tm_wday = day_offset; state |= S_WDAY; } tm->tm_yday = (7 - first_wday_of(tm->tm_year + TM_YEAR_BASE) + day_offset) % 7 + (week_offset - 1) * 7 + tm->tm_wday - day_offset; state |= S_YDAY; } } if (HAVE_YDAY(state) && HAVE_YEAR(state)) { int isleap; if (!HAVE_MON(state)) { /* calculate month of day of year */ i = 0; isleap = isleap_sum(tm->tm_year, TM_YEAR_BASE); while (tm->tm_yday >= start_of_month[isleap][i]) i++; if (i > 12) { i = 1; tm->tm_yday -= start_of_month[isleap][12]; tm->tm_year++; } tm->tm_mon = i - 1; state |= S_MON; } if (!HAVE_MDAY(state)) { /* calculate day of month */ isleap = isleap_sum(tm->tm_year, TM_YEAR_BASE); tm->tm_mday = tm->tm_yday - start_of_month[isleap][tm->tm_mon] + 1; state |= S_MDAY; } if (!HAVE_WDAY(state)) { /* calculate day of week */ i = 0; week_offset = first_wday_of(tm->tm_year); while (i++ <= tm->tm_yday) { if (week_offset++ >= 6) week_offset = 0; } tm->tm_wday = week_offset; state |= S_WDAY; } } return __UNCONST(bp); }