/* * GIT - The information manager from hell * * Copyright (C) Linus Torvalds, 2005 */ #include "cache.h" /* * This is like mktime, but without normalization of tm_wday and tm_yday. */ static time_t tm_to_time_t(const struct tm *tm) { static const int mdays[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 }; int year = tm->tm_year - 70; int month = tm->tm_mon; int day = tm->tm_mday; if (year < 0 || year > 129) /* algo only works for 1970-2099 */ return -1; if (month < 0 || month > 11) /* array bounds */ return -1; if (month < 2 || (year + 2) % 4) day--; if (tm->tm_hour < 0 || tm->tm_min < 0 || tm->tm_sec < 0) return -1; return (year * 365 + (year + 1) / 4 + mdays[month] + day) * 24*60*60UL + tm->tm_hour * 60*60 + tm->tm_min * 60 + tm->tm_sec; } static const char *month_names[] = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" }; static const char *weekday_names[] = { "Sundays", "Mondays", "Tuesdays", "Wednesdays", "Thursdays", "Fridays", "Saturdays" }; static time_t gm_time_t(timestamp_t time, int tz) { int minutes; minutes = tz < 0 ? -tz : tz; minutes = (minutes / 100)*60 + (minutes % 100); minutes = tz < 0 ? -minutes : minutes; if (minutes > 0) { if (unsigned_add_overflows(time, minutes * 60)) die("Timestamp+tz too large: %"PRItime" +%04d", time, tz); } else if (time < -minutes * 60) die("Timestamp before Unix epoch: %"PRItime" %04d", time, tz); time += minutes * 60; if (date_overflows(time)) die("Timestamp too large for this system: %"PRItime, time); return (time_t)time; } /* * The "tz" thing is passed in as this strange "decimal parse of tz" * thing, which means that tz -0100 is passed in as the integer -100, * even though it means "sixty minutes off" */ static struct tm *time_to_tm(timestamp_t time, int tz) { time_t t = gm_time_t(time, tz); return gmtime(&t); } static struct tm *time_to_tm_local(timestamp_t time) { time_t t = time; return localtime(&t); } /* * What value of "tz" was in effect back then at "time" in the * local timezone? */ static int local_tzoffset(timestamp_t time) { time_t t, t_local; struct tm tm; int offset, eastwest; if (date_overflows(time)) die("Timestamp too large for this system: %"PRItime, time); t = (time_t)time; localtime_r(&t, &tm); t_local = tm_to_time_t(&tm); if (t_local == -1) return 0; /* error; just use +0000 */ if (t_local < t) { eastwest = -1; offset = t - t_local; } else { eastwest = 1; offset = t_local - t; } offset /= 60; /* in minutes */ offset = (offset % 60) + ((offset / 60) * 100); return offset * eastwest; } void show_date_relative(timestamp_t time, int tz, const struct timeval *now, struct strbuf *timebuf) { timestamp_t diff; if (now->tv_sec < time) { strbuf_addstr(timebuf, _("in the future")); return; } diff = now->tv_sec - time; if (diff < 90) { strbuf_addf(timebuf, Q_("%"PRItime" second ago", "%"PRItime" seconds ago", diff), diff); return; } /* Turn it into minutes */ diff = (diff + 30) / 60; if (diff < 90) { strbuf_addf(timebuf, Q_("%"PRItime" minute ago", "%"PRItime" minutes ago", diff), diff); return; } /* Turn it into hours */ diff = (diff + 30) / 60; if (diff < 36) { strbuf_addf(timebuf, Q_("%"PRItime" hour ago", "%"PRItime" hours ago", diff), diff); return; } /* We deal with number of days from here on */ diff = (diff + 12) / 24; if (diff < 14) { strbuf_addf(timebuf, Q_("%"PRItime" day ago", "%"PRItime" days ago", diff), diff); return; } /* Say weeks for the past 10 weeks or so */ if (diff < 70) { strbuf_addf(timebuf, Q_("%"PRItime" week ago", "%"PRItime" weeks ago", (diff + 3) / 7), (diff + 3) / 7); return; } /* Say months for the past 12 months or so */ if (diff < 365) { strbuf_addf(timebuf, Q_("%"PRItime" month ago", "%"PRItime" months ago", (diff + 15) / 30), (diff + 15) / 30); return; } /* Give years and months for 5 years or so */ if (diff < 1825) { timestamp_t totalmonths = (diff * 12 * 2 + 365) / (365 * 2); timestamp_t years = totalmonths / 12; timestamp_t months = totalmonths % 12; if (months) { struct strbuf sb = STRBUF_INIT; strbuf_addf(&sb, Q_("%"PRItime" year", "%"PRItime" years", years), years); strbuf_addf(timebuf, /* TRANSLATORS: "%s" is "<n> years" */ Q_("%s, %"PRItime" month ago", "%s, %"PRItime" months ago", months), sb.buf, months); strbuf_release(&sb); } else strbuf_addf(timebuf, Q_("%"PRItime" year ago", "%"PRItime" years ago", years), years); return; } /* Otherwise, just years. Centuries is probably overkill. */ strbuf_addf(timebuf, Q_("%"PRItime" year ago", "%"PRItime" years ago", (diff + 183) / 365), (diff + 183) / 365); } struct date_mode *date_mode_from_type(enum date_mode_type type) { static struct date_mode mode; if (type == DATE_STRFTIME) die("BUG: cannot create anonymous strftime date_mode struct"); mode.type = type; mode.local = 0; return &mode; } const char *show_date(timestamp_t time, int tz, const struct date_mode *mode) { struct tm *tm; static struct strbuf timebuf = STRBUF_INIT; if (mode->type == DATE_UNIX) { strbuf_reset(&timebuf); strbuf_addf(&timebuf, "%"PRItime, time); return timebuf.buf; } if (mode->local) tz = local_tzoffset(time); if (mode->type == DATE_RAW) { strbuf_reset(&timebuf); strbuf_addf(&timebuf, "%"PRItime" %+05d", time, tz); return timebuf.buf; } if (mode->type == DATE_RELATIVE) { struct timeval now; strbuf_reset(&timebuf); gettimeofday(&now, NULL); show_date_relative(time, tz, &now, &timebuf); return timebuf.buf; } if (mode->local) tm = time_to_tm_local(time); else tm = time_to_tm(time, tz); if (!tm) { tm = time_to_tm(0, 0); tz = 0; } strbuf_reset(&timebuf); if (mode->type == DATE_SHORT) strbuf_addf(&timebuf, "%04d-%02d-%02d", tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday); else if (mode->type == DATE_ISO8601) strbuf_addf(&timebuf, "%04d-%02d-%02d %02d:%02d:%02d %+05d", tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec, tz); else if (mode->type == DATE_ISO8601_STRICT) { char sign = (tz >= 0) ? '+' : '-'; tz = abs(tz); strbuf_addf(&timebuf, "%04d-%02d-%02dT%02d:%02d:%02d%c%02d:%02d", tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec, sign, tz / 100, tz % 100); } else if (mode->type == DATE_RFC2822) strbuf_addf(&timebuf, "%.3s, %d %.3s %d %02d:%02d:%02d %+05d", weekday_names[tm->tm_wday], tm->tm_mday, month_names[tm->tm_mon], tm->tm_year + 1900, tm->tm_hour, tm->tm_min, tm->tm_sec, tz); else if (mode->type == DATE_STRFTIME) strbuf_addftime(&timebuf, mode->strftime_fmt, tm, tz, !mode->local); else strbuf_addf(&timebuf, "%.3s %.3s %d %02d:%02d:%02d %d%c%+05d", weekday_names[tm->tm_wday], month_names[tm->tm_mon], tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_year + 1900, mode->local ? 0 : ' ', tz); return timebuf.buf; } /* * Check these. And note how it doesn't do the summer-time conversion. * * In my world, it's always summer, and things are probably a bit off * in other ways too. */ static const struct { const char *name; int offset; int dst; } timezone_names[] = { { "IDLW", -12, 0, }, /* International Date Line West */ { "NT", -11, 0, }, /* Nome */ { "CAT", -10, 0, }, /* Central Alaska */ { "HST", -10, 0, }, /* Hawaii Standard */ { "HDT", -10, 1, }, /* Hawaii Daylight */ { "YST", -9, 0, }, /* Yukon Standard */ { "YDT", -9, 1, }, /* Yukon Daylight */ { "PST", -8, 0, }, /* Pacific Standard */ { "PDT", -8, 1, }, /* Pacific Daylight */ { "MST", -7, 0, }, /* Mountain Standard */ { "MDT", -7, 1, }, /* Mountain Daylight */ { "CST", -6, 0, }, /* Central Standard */ { "CDT", -6, 1, }, /* Central Daylight */ { "EST", -5, 0, }, /* Eastern Standard */ { "EDT", -5, 1, }, /* Eastern Daylight */ { "AST", -3, 0, }, /* Atlantic Standard */ { "ADT", -3, 1, }, /* Atlantic Daylight */ { "WAT", -1, 0, }, /* West Africa */ { "GMT", 0, 0, }, /* Greenwich Mean */ { "UTC", 0, 0, }, /* Universal (Coordinated) */ { "Z", 0, 0, }, /* Zulu, alias for UTC */ { "WET", 0, 0, }, /* Western European */ { "BST", 0, 1, }, /* British Summer */ { "CET", +1, 0, }, /* Central European */ { "MET", +1, 0, }, /* Middle European */ { "MEWT", +1, 0, }, /* Middle European Winter */ { "MEST", +1, 1, }, /* Middle European Summer */ { "CEST", +1, 1, }, /* Central European Summer */ { "MESZ", +1, 1, }, /* Middle European Summer */ { "FWT", +1, 0, }, /* French Winter */ { "FST", +1, 1, }, /* French Summer */ { "EET", +2, 0, }, /* Eastern Europe, USSR Zone 1 */ { "EEST", +2, 1, }, /* Eastern European Daylight */ { "WAST", +7, 0, }, /* West Australian Standard */ { "WADT", +7, 1, }, /* West Australian Daylight */ { "CCT", +8, 0, }, /* China Coast, USSR Zone 7 */ { "JST", +9, 0, }, /* Japan Standard, USSR Zone 8 */ { "EAST", +10, 0, }, /* Eastern Australian Standard */ { "EADT", +10, 1, }, /* Eastern Australian Daylight */ { "GST", +10, 0, }, /* Guam Standard, USSR Zone 9 */ { "NZT", +12, 0, }, /* New Zealand */ { "NZST", +12, 0, }, /* New Zealand Standard */ { "NZDT", +12, 1, }, /* New Zealand Daylight */ { "IDLE", +12, 0, }, /* International Date Line East */ }; static int match_string(const char *date, const char *str) { int i = 0; for (i = 0; *date; date++, str++, i++) { if (*date == *str) continue; if (toupper(*date) == toupper(*str)) continue; if (!isalnum(*date)) break; return 0; } return i; } static int skip_alpha(const char *date) { int i = 0; do { i++; } while (isalpha(date[i])); return i; } /* * Parse month, weekday, or timezone name */ static int match_alpha(const char *date, struct tm *tm, int *offset) { int i; for (i = 0; i < 12; i++) { int match = match_string(date, month_names[i]); if (match >= 3) { tm->tm_mon = i; return match; } } for (i = 0; i < 7; i++) { int match = match_string(date, weekday_names[i]); if (match >= 3) { tm->tm_wday = i; return match; } } for (i = 0; i < ARRAY_SIZE(timezone_names); i++) { int match = match_string(date, timezone_names[i].name); if (match >= 3 || match == strlen(timezone_names[i].name)) { int off = timezone_names[i].offset; /* This is bogus, but we like summer */ off += timezone_names[i].dst; /* Only use the tz name offset if we don't have anything better */ if (*offset == -1) *offset = 60*off; return match; } } if (match_string(date, "PM") == 2) { tm->tm_hour = (tm->tm_hour % 12) + 12; return 2; } if (match_string(date, "AM") == 2) { tm->tm_hour = (tm->tm_hour % 12) + 0; return 2; } /* BAD CRAP */ return skip_alpha(date); } static int is_date(int year, int month, int day, struct tm *now_tm, time_t now, struct tm *tm) { if (month > 0 && month < 13 && day > 0 && day < 32) { struct tm check = *tm; struct tm *r = (now_tm ? &check : tm); time_t specified; r->tm_mon = month - 1; r->tm_mday = day; if (year == -1) { if (!now_tm) return 1; r->tm_year = now_tm->tm_year; } else if (year >= 1970 && year < 2100) r->tm_year = year - 1900; else if (year > 70 && year < 100) r->tm_year = year; else if (year < 38) r->tm_year = year + 100; else return 0; if (!now_tm) return 1; specified = tm_to_time_t(r); /* Be it commit time or author time, it does not make * sense to specify timestamp way into the future. Make * sure it is not later than ten days from now... */ if ((specified != -1) && (now + 10*24*3600 < specified)) return 0; tm->tm_mon = r->tm_mon; tm->tm_mday = r->tm_mday; if (year != -1) tm->tm_year = r->tm_year; return 1; } return 0; } static int match_multi_number(timestamp_t num, char c, const char *date, char *end, struct tm *tm, time_t now) { struct tm now_tm; struct tm *refuse_future; long num2, num3; num2 = strtol(end+1, &end, 10); num3 = -1; if (*end == c && isdigit(end[1])) num3 = strtol(end+1, &end, 10); /* Time? Date? */ switch (c) { case ':': if (num3 < 0) num3 = 0; if (num < 25 && num2 >= 0 && num2 < 60 && num3 >= 0 && num3 <= 60) { tm->tm_hour = num; tm->tm_min = num2; tm->tm_sec = num3; break; } return 0; case '-': case '/': case '.': if (!now) now = time(NULL); refuse_future = NULL; if (gmtime_r(&now, &now_tm)) refuse_future = &now_tm; if (num > 70) { /* yyyy-mm-dd? */ if (is_date(num, num2, num3, NULL, now, tm)) break; /* yyyy-dd-mm? */ if (is_date(num, num3, num2, NULL, now, tm)) break; } /* Our eastern European friends say dd.mm.yy[yy] * is the norm there, so giving precedence to * mm/dd/yy[yy] form only when separator is not '.' */ if (c != '.' && is_date(num3, num, num2, refuse_future, now, tm)) break; /* European dd.mm.yy[yy] or funny US dd/mm/yy[yy] */ if (is_date(num3, num2, num, refuse_future, now, tm)) break; /* Funny European mm.dd.yy */ if (c == '.' && is_date(num3, num, num2, refuse_future, now, tm)) break; return 0; } return end - date; } /* * Have we filled in any part of the time/date yet? * We just do a binary 'and' to see if the sign bit * is set in all the values. */ static inline int nodate(struct tm *tm) { return (tm->tm_year & tm->tm_mon & tm->tm_mday & tm->tm_hour & tm->tm_min & tm->tm_sec) < 0; } /* * We've seen a digit. Time? Year? Date? */ static int match_digit(const char *date, struct tm *tm, int *offset, int *tm_gmt) { int n; char *end; timestamp_t num; num = parse_timestamp(date, &end, 10); /* * Seconds since 1970? We trigger on that for any numbers with * more than 8 digits. This is because we don't want to rule out * numbers like 20070606 as a YYYYMMDD date. */ if (num >= 100000000 && nodate(tm)) { time_t time = num; if (gmtime_r(&time, tm)) { *tm_gmt = 1; return end - date; } } /* * Check for special formats: num[-.:/]num[same]num */ switch (*end) { case ':': case '.': case '/': case '-': if (isdigit(end[1])) { int match = match_multi_number(num, *end, date, end, tm, 0); if (match) return match; } } /* * None of the special formats? Try to guess what * the number meant. We use the number of digits * to make a more educated guess.. */ n = 0; do { n++; } while (isdigit(date[n])); /* Four-digit year or a timezone? */ if (n == 4) { if (num <= 1400 && *offset == -1) { unsigned int minutes = num % 100; unsigned int hours = num / 100; *offset = hours*60 + minutes; } else if (num > 1900 && num < 2100) tm->tm_year = num - 1900; return n; } /* * Ignore lots of numerals. We took care of 4-digit years above. * Days or months must be one or two digits. */ if (n > 2) return n; /* * NOTE! We will give precedence to day-of-month over month or * year numbers in the 1-12 range. So 05 is always "mday 5", * unless we already have a mday.. * * IOW, 01 Apr 05 parses as "April 1st, 2005". */ if (num > 0 && num < 32 && tm->tm_mday < 0) { tm->tm_mday = num; return n; } /* Two-digit year? */ if (n == 2 && tm->tm_year < 0) { if (num < 10 && tm->tm_mday >= 0) { tm->tm_year = num + 100; return n; } if (num >= 70) { tm->tm_year = num; return n; } } if (num > 0 && num < 13 && tm->tm_mon < 0) tm->tm_mon = num-1; return n; } static int match_tz(const char *date, int *offp) { char *end; int hour = strtoul(date + 1, &end, 10); int n = end - (date + 1); int min = 0; if (n == 4) { /* hhmm */ min = hour % 100; hour = hour / 100; } else if (n != 2) { min = 99; /* random crap */ } else if (*end == ':') { /* hh:mm? */ min = strtoul(end + 1, &end, 10); if (end - (date + 1) != 5) min = 99; /* random crap */ } /* otherwise we parsed "hh" */ /* * Don't accept any random crap. Even though some places have * offset larger than 12 hours (e.g. Pacific/Kiritimati is at * UTC+14), there is something wrong if hour part is much * larger than that. We might also want to check that the * minutes are divisible by 15 or something too. (Offset of * Kathmandu, Nepal is UTC+5:45) */ if (min < 60 && hour < 24) { int offset = hour * 60 + min; if (*date == '-') offset = -offset; *offp = offset; } return end - date; } static void date_string(timestamp_t date, int offset, struct strbuf *buf) { int sign = '+'; if (offset < 0) { offset = -offset; sign = '-'; } strbuf_addf(buf, "%"PRItime" %c%02d%02d", date, sign, offset / 60, offset % 60); } /* * Parse a string like "0 +0000" as ancient timestamp near epoch, but * only when it appears not as part of any other string. */ static int match_object_header_date(const char *date, timestamp_t *timestamp, int *offset) { char *end; timestamp_t stamp; int ofs; if (*date < '0' || '9' < *date) return -1; stamp = parse_timestamp(date, &end, 10); if (*end != ' ' || stamp == TIME_MAX || (end[1] != '+' && end[1] != '-')) return -1; date = end + 2; ofs = strtol(date, &end, 10); if ((*end != '\0' && (*end != '\n')) || end != date + 4) return -1; ofs = (ofs / 100) * 60 + (ofs % 100); if (date[-1] == '-') ofs = -ofs; *timestamp = stamp; *offset = ofs; return 0; } /* Gr. strptime is crap for this; it doesn't have a way to require RFC2822 (i.e. English) day/month names, and it doesn't work correctly with %z. */ int parse_date_basic(const char *date, timestamp_t *timestamp, int *offset) { struct tm tm; int tm_gmt; timestamp_t dummy_timestamp; int dummy_offset; if (!timestamp) timestamp = &dummy_timestamp; if (!offset) offset = &dummy_offset; memset(&tm, 0, sizeof(tm)); tm.tm_year = -1; tm.tm_mon = -1; tm.tm_mday = -1; tm.tm_isdst = -1; tm.tm_hour = -1; tm.tm_min = -1; tm.tm_sec = -1; *offset = -1; tm_gmt = 0; if (*date == '@' && !match_object_header_date(date + 1, timestamp, offset)) return 0; /* success */ for (;;) { int match = 0; unsigned char c = *date; /* Stop at end of string or newline */ if (!c || c == '\n') break; if (isalpha(c)) match = match_alpha(date, &tm, offset); else if (isdigit(c)) match = match_digit(date, &tm, offset, &tm_gmt); else if ((c == '-' || c == '+') && isdigit(date[1])) match = match_tz(date, offset); if (!match) { /* BAD CRAP */ match = 1; } date += match; } /* do not use mktime(), which uses local timezone, here */ *timestamp = tm_to_time_t(&tm); if (*timestamp == -1) return -1; if (*offset == -1) { time_t temp_time; /* gmtime_r() in match_digit() may have clobbered it */ tm.tm_isdst = -1; temp_time = mktime(&tm); if ((time_t)*timestamp > temp_time) { *offset = ((time_t)*timestamp - temp_time) / 60; } else { *offset = -(int)((temp_time - (time_t)*timestamp) / 60); } } if (!tm_gmt) *timestamp -= *offset * 60; return 0; /* success */ } int parse_expiry_date(const char *date, timestamp_t *timestamp) { int errors = 0; if (!strcmp(date, "never") || !strcmp(date, "false")) *timestamp = 0; else if (!strcmp(date, "all") || !strcmp(date, "now")) /* * We take over "now" here, which usually translates * to the current timestamp. This is because the user * really means to expire everything she has done in * the past, and by definition reflogs are the record * of the past, and there is nothing from the future * to be kept. */ *timestamp = TIME_MAX; else *timestamp = approxidate_careful(date, &errors); return errors; } int parse_date(const char *date, struct strbuf *result) { timestamp_t timestamp; int offset; if (parse_date_basic(date, ×tamp, &offset)) return -1; date_string(timestamp, offset, result); return 0; } static enum date_mode_type parse_date_type(const char *format, const char **end) { if (skip_prefix(format, "relative", end)) return DATE_RELATIVE; if (skip_prefix(format, "iso8601-strict", end) || skip_prefix(format, "iso-strict", end)) return DATE_ISO8601_STRICT; if (skip_prefix(format, "iso8601", end) || skip_prefix(format, "iso", end)) return DATE_ISO8601; if (skip_prefix(format, "rfc2822", end) || skip_prefix(format, "rfc", end)) return DATE_RFC2822; if (skip_prefix(format, "short", end)) return DATE_SHORT; if (skip_prefix(format, "default", end)) return DATE_NORMAL; if (skip_prefix(format, "raw", end)) return DATE_RAW; if (skip_prefix(format, "unix", end)) return DATE_UNIX; if (skip_prefix(format, "format", end)) return DATE_STRFTIME; die("unknown date format %s", format); } void parse_date_format(const char *format, struct date_mode *mode) { const char *p; /* historical alias */ if (!strcmp(format, "local")) format = "default-local"; mode->type = parse_date_type(format, &p); mode->local = 0; if (skip_prefix(p, "-local", &p)) mode->local = 1; if (mode->type == DATE_STRFTIME) { if (!skip_prefix(p, ":", &p)) die("date format missing colon separator: %s", format); mode->strftime_fmt = xstrdup(p); } else if (*p) die("unknown date format %s", format); } void datestamp(struct strbuf *out) { time_t now; int offset; time(&now); offset = tm_to_time_t(localtime(&now)) - now; offset /= 60; date_string(now, offset, out); } /* * Relative time update (eg "2 days ago"). If we haven't set the time * yet, we need to set it from current time. */ static time_t update_tm(struct tm *tm, struct tm *now, time_t sec) { time_t n; if (tm->tm_mday < 0) tm->tm_mday = now->tm_mday; if (tm->tm_mon < 0) tm->tm_mon = now->tm_mon; if (tm->tm_year < 0) { tm->tm_year = now->tm_year; if (tm->tm_mon > now->tm_mon) tm->tm_year--; } n = mktime(tm) - sec; localtime_r(&n, tm); return n; } static void date_now(struct tm *tm, struct tm *now, int *num) { update_tm(tm, now, 0); } static void date_yesterday(struct tm *tm, struct tm *now, int *num) { update_tm(tm, now, 24*60*60); } static void date_time(struct tm *tm, struct tm *now, int hour) { if (tm->tm_hour < hour) date_yesterday(tm, now, NULL); tm->tm_hour = hour; tm->tm_min = 0; tm->tm_sec = 0; } static void date_midnight(struct tm *tm, struct tm *now, int *num) { date_time(tm, now, 0); } static void date_noon(struct tm *tm, struct tm *now, int *num) { date_time(tm, now, 12); } static void date_tea(struct tm *tm, struct tm *now, int *num) { date_time(tm, now, 17); } static void date_pm(struct tm *tm, struct tm *now, int *num) { int hour, n = *num; *num = 0; hour = tm->tm_hour; if (n) { hour = n; tm->tm_min = 0; tm->tm_sec = 0; } tm->tm_hour = (hour % 12) + 12; } static void date_am(struct tm *tm, struct tm *now, int *num) { int hour, n = *num; *num = 0; hour = tm->tm_hour; if (n) { hour = n; tm->tm_min = 0; tm->tm_sec = 0; } tm->tm_hour = (hour % 12); } static void date_never(struct tm *tm, struct tm *now, int *num) { time_t n = 0; localtime_r(&n, tm); } static const struct special { const char *name; void (*fn)(struct tm *, struct tm *, int *); } special[] = { { "yesterday", date_yesterday }, { "noon", date_noon }, { "midnight", date_midnight }, { "tea", date_tea }, { "PM", date_pm }, { "AM", date_am }, { "never", date_never }, { "now", date_now }, { NULL } }; static const char *number_name[] = { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", }; static const struct typelen { const char *type; int length; } typelen[] = { { "seconds", 1 }, { "minutes", 60 }, { "hours", 60*60 }, { "days", 24*60*60 }, { "weeks", 7*24*60*60 }, { NULL } }; static const char *approxidate_alpha(const char *date, struct tm *tm, struct tm *now, int *num, int *touched) { const struct typelen *tl; const struct special *s; const char *end = date; int i; while (isalpha(*++end)) ; for (i = 0; i < 12; i++) { int match = match_string(date, month_names[i]); if (match >= 3) { tm->tm_mon = i; *touched = 1; return end; } } for (s = special; s->name; s++) { int len = strlen(s->name); if (match_string(date, s->name) == len) { s->fn(tm, now, num); *touched = 1; return end; } } if (!*num) { for (i = 1; i < 11; i++) { int len = strlen(number_name[i]); if (match_string(date, number_name[i]) == len) { *num = i; *touched = 1; return end; } } if (match_string(date, "last") == 4) { *num = 1; *touched = 1; } return end; } tl = typelen; while (tl->type) { int len = strlen(tl->type); if (match_string(date, tl->type) >= len-1) { update_tm(tm, now, tl->length * *num); *num = 0; *touched = 1; return end; } tl++; } for (i = 0; i < 7; i++) { int match = match_string(date, weekday_names[i]); if (match >= 3) { int diff, n = *num -1; *num = 0; diff = tm->tm_wday - i; if (diff <= 0) n++; diff += 7*n; update_tm(tm, now, diff * 24 * 60 * 60); *touched = 1; return end; } } if (match_string(date, "months") >= 5) { int n; update_tm(tm, now, 0); /* fill in date fields if needed */ n = tm->tm_mon - *num; *num = 0; while (n < 0) { n += 12; tm->tm_year--; } tm->tm_mon = n; *touched = 1; return end; } if (match_string(date, "years") >= 4) { update_tm(tm, now, 0); /* fill in date fields if needed */ tm->tm_year -= *num; *num = 0; *touched = 1; return end; } return end; } static const char *approxidate_digit(const char *date, struct tm *tm, int *num, time_t now) { char *end; timestamp_t number = parse_timestamp(date, &end, 10); switch (*end) { case ':': case '.': case '/': case '-': if (isdigit(end[1])) { int match = match_multi_number(number, *end, date, end, tm, now); if (match) return date + match; } } /* Accept zero-padding only for small numbers ("Dec 02", never "Dec 0002") */ if (date[0] != '0' || end - date <= 2) *num = number; return end; } /* * Do we have a pending number at the end, or when * we see a new one? Let's assume it's a month day, * as in "Dec 6, 1992" */ static void pending_number(struct tm *tm, int *num) { int number = *num; if (number) { *num = 0; if (tm->tm_mday < 0 && number < 32) tm->tm_mday = number; else if (tm->tm_mon < 0 && number < 13) tm->tm_mon = number-1; else if (tm->tm_year < 0) { if (number > 1969 && number < 2100) tm->tm_year = number - 1900; else if (number > 69 && number < 100) tm->tm_year = number; else if (number < 38) tm->tm_year = 100 + number; /* We screw up for number = 00 ? */ } } } static timestamp_t approxidate_str(const char *date, const struct timeval *tv, int *error_ret) { int number = 0; int touched = 0; struct tm tm, now; time_t time_sec; time_sec = tv->tv_sec; localtime_r(&time_sec, &tm); now = tm; tm.tm_year = -1; tm.tm_mon = -1; tm.tm_mday = -1; for (;;) { unsigned char c = *date; if (!c) break; date++; if (isdigit(c)) { pending_number(&tm, &number); date = approxidate_digit(date-1, &tm, &number, time_sec); touched = 1; continue; } if (isalpha(c)) date = approxidate_alpha(date-1, &tm, &now, &number, &touched); } pending_number(&tm, &number); if (!touched) *error_ret = 1; return (timestamp_t)update_tm(&tm, &now, 0); } timestamp_t approxidate_relative(const char *date, const struct timeval *tv) { timestamp_t timestamp; int offset; int errors = 0; if (!parse_date_basic(date, ×tamp, &offset)) return timestamp; return approxidate_str(date, tv, &errors); } timestamp_t approxidate_careful(const char *date, int *error_ret) { struct timeval tv; timestamp_t timestamp; int offset; int dummy = 0; if (!error_ret) error_ret = &dummy; if (!parse_date_basic(date, ×tamp, &offset)) { *error_ret = 0; return timestamp; } gettimeofday(&tv, NULL); return approxidate_str(date, &tv, error_ret); } int date_overflows(timestamp_t t) { time_t sys; /* If we overflowed our timestamp data type, that's bad... */ if ((uintmax_t)t >= TIME_MAX) return 1; /* * ...but we also are going to feed the result to system * functions that expect time_t, which is often "signed long". * Make sure that we fit into time_t, as well. */ sys = t; return t != sys || (t < 1) != (sys < 1); }