diff options
Diffstat (limited to 'date.c')
| -rw-r--r-- | date.c | 526 |
1 files changed, 383 insertions, 143 deletions
@@ -4,12 +4,12 @@ * Copyright (C) Linus Torvalds, 2005 */ -#include <time.h> -#include <sys/time.h> - #include "cache.h" -static time_t my_mktime(struct tm *tm) +/* + * 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 @@ -24,6 +24,8 @@ static time_t my_mktime(struct tm *tm) 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; } @@ -58,78 +60,141 @@ static struct tm *time_to_tm(unsigned long time, int tz) return gmtime(&t); } -const char *show_date(unsigned long time, int tz, int relative) +/* + * What value of "tz" was in effect back then at "time" in the + * local timezone? + */ +static int local_tzoffset(unsigned long time) { - struct tm *tm; - static char timebuf[200]; - - if (relative) { - unsigned long diff; - time_t t = gm_time_t(time, tz); - struct timeval now; - gettimeofday(&now, NULL); - if (now.tv_sec < t) - return "in the future"; - diff = now.tv_sec - t; - if (diff < 90) { - snprintf(timebuf, sizeof(timebuf), "%lu seconds ago", diff); - return timebuf; - } - /* Turn it into minutes */ - diff = (diff + 30) / 60; - if (diff < 90) { - snprintf(timebuf, sizeof(timebuf), "%lu minutes ago", diff); - return timebuf; - } - /* Turn it into hours */ - diff = (diff + 30) / 60; - if (diff < 36) { - snprintf(timebuf, sizeof(timebuf), "%lu hours ago", diff); - return timebuf; - } - /* We deal with number of days from here on */ - diff = (diff + 12) / 24; - if (diff < 14) { - snprintf(timebuf, sizeof(timebuf), "%lu days ago", diff); - return timebuf; - } - /* Say weeks for the past 10 weeks or so */ - if (diff < 70) { - snprintf(timebuf, sizeof(timebuf), "%lu weeks ago", (diff + 3) / 7); - return timebuf; - } - /* Say months for the past 12 months or so */ - if (diff < 360) { - snprintf(timebuf, sizeof(timebuf), "%lu months ago", (diff + 15) / 30); - return timebuf; - } - /* Else fall back on absolute format.. */ + time_t t, t_local; + struct tm tm; + int offset, eastwest; + + t = time; + localtime_r(&t, &tm); + t_local = tm_to_time_t(&tm); + + 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; +} - tm = time_to_tm(time, tz); - if (!tm) - return NULL; - sprintf(timebuf, "%.3s %.3s %d %02d:%02d:%02d %d %+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, tz); +const char *show_date_relative(unsigned long time, int tz, + const struct timeval *now, + char *timebuf, + size_t timebuf_size) +{ + unsigned long diff; + if (now->tv_sec < time) + return "in the future"; + diff = now->tv_sec - time; + if (diff < 90) { + snprintf(timebuf, timebuf_size, "%lu seconds ago", diff); + return timebuf; + } + /* Turn it into minutes */ + diff = (diff + 30) / 60; + if (diff < 90) { + snprintf(timebuf, timebuf_size, "%lu minutes ago", diff); + return timebuf; + } + /* Turn it into hours */ + diff = (diff + 30) / 60; + if (diff < 36) { + snprintf(timebuf, timebuf_size, "%lu hours ago", diff); + return timebuf; + } + /* We deal with number of days from here on */ + diff = (diff + 12) / 24; + if (diff < 14) { + snprintf(timebuf, timebuf_size, "%lu days ago", diff); + return timebuf; + } + /* Say weeks for the past 10 weeks or so */ + if (diff < 70) { + snprintf(timebuf, timebuf_size, "%lu weeks ago", (diff + 3) / 7); + return timebuf; + } + /* Say months for the past 12 months or so */ + if (diff < 365) { + snprintf(timebuf, timebuf_size, "%lu months ago", (diff + 15) / 30); + return timebuf; + } + /* Give years and months for 5 years or so */ + if (diff < 1825) { + unsigned long totalmonths = (diff * 12 * 2 + 365) / (365 * 2); + unsigned long years = totalmonths / 12; + unsigned long months = totalmonths % 12; + int n; + n = snprintf(timebuf, timebuf_size, "%lu year%s", + years, (years > 1 ? "s" : "")); + if (months) + snprintf(timebuf + n, timebuf_size - n, + ", %lu month%s ago", + months, (months > 1 ? "s" : "")); + else + snprintf(timebuf + n, timebuf_size - n, " ago"); + return timebuf; + } + /* Otherwise, just years. Centuries is probably overkill. */ + snprintf(timebuf, timebuf_size, "%lu years ago", (diff + 183) / 365); return timebuf; } -const char *show_rfc2822_date(unsigned long time, int tz) +const char *show_date(unsigned long time, int tz, enum date_mode mode) { struct tm *tm; static char timebuf[200]; + if (mode == DATE_RAW) { + snprintf(timebuf, sizeof(timebuf), "%lu %+05d", time, tz); + return timebuf; + } + + if (mode == DATE_RELATIVE) { + struct timeval now; + gettimeofday(&now, NULL); + return show_date_relative(time, tz, &now, + timebuf, sizeof(timebuf)); + } + + if (mode == DATE_LOCAL) + tz = local_tzoffset(time); + tm = time_to_tm(time, tz); if (!tm) return NULL; - sprintf(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); + if (mode == DATE_SHORT) + sprintf(timebuf, "%04d-%02d-%02d", tm->tm_year + 1900, + tm->tm_mon + 1, tm->tm_mday); + else if (mode == DATE_ISO8601) + sprintf(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 == DATE_RFC2822) + sprintf(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 + sprintf(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 == DATE_LOCAL) ? 0 : ' ', + tz); return timebuf; } @@ -165,6 +230,7 @@ static const struct { { "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 */ @@ -185,9 +251,9 @@ static const struct { { "EAST", +10, 0, }, /* Eastern Australian Standard */ { "EADT", +10, 1, }, /* Eastern Australian Daylight */ { "GST", +10, 0, }, /* Guam Standard, USSR Zone 9 */ - { "NZT", +11, 0, }, /* New Zealand */ - { "NZST", +11, 0, }, /* New Zealand Standard */ - { "NZDT", +11, 1, }, /* New Zealand Daylight */ + { "NZT", +12, 0, }, /* New Zealand */ + { "NZST", +12, 0, }, /* New Zealand Standard */ + { "NZDT", +12, 1, }, /* New Zealand Daylight */ { "IDLE", +12, 0, }, /* International Date Line East */ }; @@ -241,7 +307,7 @@ static int match_alpha(const char *date, struct tm *tm, int *offset) for (i = 0; i < ARRAY_SIZE(timezone_names); i++) { int match = match_string(date, timezone_names[i].name); - if (match >= 3) { + if (match >= 3 || match == strlen(timezone_names[i].name)) { int off = timezone_names[i].offset; /* This is bogus, but we like summer */ @@ -294,7 +360,7 @@ static int is_date(int year, int month, int day, struct tm *now_tm, time_t now, if (!now_tm) return 1; - specified = my_mktime(r); + 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 @@ -372,7 +438,22 @@ static int match_multi_number(unsigned long num, char c, const char *date, char } /* - * We've seen a digit. Time? Year? 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) { @@ -383,9 +464,11 @@ static int match_digit(const char *date, struct tm *tm, int *offset, int *tm_gmt num = strtoul(date, &end, 10); /* - * Seconds since 1970? We trigger on that for anything after Jan 1, 2000 + * 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 > 946684800) { + if (num >= 100000000 && nodate(tm)) { time_t time = num; if (gmtime_r(&time, tm)) { *tm_gmt = 1; @@ -430,6 +513,13 @@ static int match_digit(const char *date, struct tm *tm, int *offset, int *tm_gmt } /* + * 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.. @@ -453,39 +543,44 @@ static int match_digit(const char *date, struct tm *tm, int *offset, int *tm_gmt } } - if (num > 0 && num < 32) { - tm->tm_mday = num; - } else if (num > 1900) { - tm->tm_year = num - 1900; - } else if (num > 70) { - tm->tm_year = num; - } else if (num > 0 && num < 13) { + 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 offset = strtoul(date+1, &end, 10); - int min, hour; - int n = end - date - 1; + int hour = strtoul(date + 1, &end, 10); + int n = end - (date + 1); + int min = 0; - min = offset % 100; - hour = offset / 100; + 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.. At least 3 digits, and - * a valid minute. We might want to check that the minutes - * are divisible by 30 or something too. + * 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 && n > 2) { - offset = hour*60+min; + if (min < 60 && hour < 24) { + int offset = hour * 60 + min; if (*date == '-') offset = -offset; - *offp = offset; } return end - date; @@ -504,18 +599,27 @@ static int date_string(unsigned long date, int offset, char *buf, int len) /* 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(const char *date, char *result, int maxlen) +int parse_date_basic(const char *date, unsigned long *timestamp, int *offset) { struct tm tm; - int offset, tm_gmt; - time_t then; + int tm_gmt; + unsigned long 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; - offset = -1; + tm.tm_hour = -1; + tm.tm_min = -1; + tm.tm_sec = -1; + *offset = -1; tm_gmt = 0; for (;;) { @@ -527,31 +631,62 @@ int parse_date(const char *date, char *result, int maxlen) break; if (isalpha(c)) - match = match_alpha(date, &tm, &offset); + match = match_alpha(date, &tm, offset); else if (isdigit(c)) - match = match_digit(date, &tm, &offset, &tm_gmt); + match = match_digit(date, &tm, offset, &tm_gmt); else if ((c == '-' || c == '+') && isdigit(date[1])) - match = match_tz(date, &offset); + match = match_tz(date, offset); if (!match) { /* BAD CRAP */ match = 1; - } + } date += match; } /* mktime uses local timezone */ - then = my_mktime(&tm); - if (offset == -1) - offset = (then - mktime(&tm)) / 60; + *timestamp = tm_to_time_t(&tm); + if (*offset == -1) + *offset = ((time_t)*timestamp - mktime(&tm)) / 60; - if (then == -1) + if (*timestamp == -1) return -1; if (!tm_gmt) - then -= offset * 60; - return date_string(then, offset, result, maxlen); + *timestamp -= *offset * 60; + return 0; /* success */ +} + +int parse_date(const char *date, char *result, int maxlen) +{ + unsigned long timestamp; + int offset; + if (parse_date_basic(date, ×tamp, &offset)) + return -1; + return date_string(timestamp, offset, result, maxlen); +} + +enum date_mode parse_date_format(const char *format) +{ + if (!strcmp(format, "relative")) + return DATE_RELATIVE; + else if (!strcmp(format, "iso8601") || + !strcmp(format, "iso")) + return DATE_ISO8601; + else if (!strcmp(format, "rfc2822") || + !strcmp(format, "rfc")) + return DATE_RFC2822; + else if (!strcmp(format, "short")) + return DATE_SHORT; + else if (!strcmp(format, "local")) + return DATE_LOCAL; + else if (!strcmp(format, "default")) + return DATE_NORMAL; + else if (!strcmp(format, "raw")) + return DATE_RAW; + else + die("unknown date format %s", format); } void datestamp(char *buf, int bufsize) @@ -561,48 +696,70 @@ void datestamp(char *buf, int bufsize) time(&now); - offset = my_mktime(localtime(&now)) - now; + offset = tm_to_time_t(localtime(&now)) - now; offset /= 60; date_string(now, offset, buf, bufsize); } -static void update_tm(struct tm *tm, unsigned long sec) +/* + * Relative time update (eg "2 days ago"). If we haven't set the time + * yet, we need to set it from current time. + */ +static unsigned long update_tm(struct tm *tm, struct tm *now, unsigned long sec) { - time_t n = mktime(tm) - 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, int *num) +static void date_yesterday(struct tm *tm, struct tm *now, int *num) { - update_tm(tm, 24*60*60); + update_tm(tm, now, 24*60*60); } -static void date_time(struct tm *tm, int hour) +static void date_time(struct tm *tm, struct tm *now, int hour) { if (tm->tm_hour < hour) - date_yesterday(tm, NULL); + date_yesterday(tm, now, NULL); tm->tm_hour = hour; tm->tm_min = 0; tm->tm_sec = 0; } -static void date_midnight(struct tm *tm, int *num) +static void date_midnight(struct tm *tm, struct tm *now, int *num) { - date_time(tm, 0); + date_time(tm, now, 0); } -static void date_noon(struct tm *tm, int *num) +static void date_noon(struct tm *tm, struct tm *now, int *num) { - date_time(tm, 12); + date_time(tm, now, 12); } -static void date_tea(struct tm *tm, int *num) +static void date_tea(struct tm *tm, struct tm *now, int *num) { - date_time(tm, 17); + date_time(tm, now, 17); } -static void date_pm(struct tm *tm, int *num) +static void date_pm(struct tm *tm, struct tm *now, int *num) { int hour, n = *num; *num = 0; @@ -616,7 +773,7 @@ static void date_pm(struct tm *tm, int *num) tm->tm_hour = (hour % 12) + 12; } -static void date_am(struct tm *tm, int *num) +static void date_am(struct tm *tm, struct tm *now, int *num) { int hour, n = *num; *num = 0; @@ -630,9 +787,15 @@ static void date_am(struct tm *tm, int *num) 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 *, int *); + void (*fn)(struct tm *, struct tm *, int *); } special[] = { { "yesterday", date_yesterday }, { "noon", date_noon }, @@ -640,6 +803,8 @@ static const struct special { { "tea", date_tea }, { "PM", date_pm }, { "AM", date_am }, + { "never", date_never }, + { "now", date_now }, { NULL } }; @@ -658,9 +823,9 @@ static const struct typelen { { "days", 24*60*60 }, { "weeks", 7*24*60*60 }, { NULL } -}; +}; -static const char *approxidate_alpha(const char *date, struct tm *tm, int *num) +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; @@ -674,6 +839,7 @@ static const char *approxidate_alpha(const char *date, struct tm *tm, int *num) int match = match_string(date, month_names[i]); if (match >= 3) { tm->tm_mon = i; + *touched = 1; return end; } } @@ -681,7 +847,8 @@ static const char *approxidate_alpha(const char *date, struct tm *tm, int *num) for (s = special; s->name; s++) { int len = strlen(s->name); if (match_string(date, s->name) == len) { - s->fn(tm, num); + s->fn(tm, now, num); + *touched = 1; return end; } } @@ -691,11 +858,14 @@ static const char *approxidate_alpha(const char *date, struct tm *tm, int *num) 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) + if (match_string(date, "last") == 4) { *num = 1; + *touched = 1; + } return end; } @@ -703,8 +873,9 @@ static const char *approxidate_alpha(const char *date, struct tm *tm, int *num) while (tl->type) { int len = strlen(tl->type); if (match_string(date, tl->type) >= len-1) { - update_tm(tm, tl->length * *num); + update_tm(tm, now, tl->length * *num); *num = 0; + *touched = 1; return end; } tl++; @@ -721,25 +892,31 @@ static const char *approxidate_alpha(const char *date, struct tm *tm, int *num) n++; diff += 7*n; - update_tm(tm, diff * 24 * 60 * 60); + update_tm(tm, now, diff * 24 * 60 * 60); + *touched = 1; return end; } } if (match_string(date, "months") >= 5) { - int n = tm->tm_mon - *num; + 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; } @@ -763,38 +940,101 @@ static const char *approxidate_digit(const char *date, struct tm *tm, int *num) } } - *num = number; + /* Accept zero-padding only for small numbers ("Dec 02", never "Dec 0002") */ + if (date[0] != '0' || end - date <= 2) + *num = number; return end; } -unsigned long approxidate(const char *date) +/* + * 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 unsigned long approxidate_str(const char *date, + const struct timeval *tv, + int *error_ret) { int number = 0; + int touched = 0; struct tm tm, now; - struct timeval tv; - char buffer[50]; - - if (parse_date(date, buffer, sizeof(buffer)) > 0) - return strtoul(buffer, NULL, 10); + time_t time_sec; - gettimeofday(&tv, NULL); - localtime_r(&tv.tv_sec, &tm); + 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); + touched = 1; continue; } if (isalpha(c)) - date = approxidate_alpha(date-1, &tm, &number); + date = approxidate_alpha(date-1, &tm, &now, &number, &touched); } - if (number > 0 && number < 32) - tm.tm_mday = number; - if (tm.tm_mon > now.tm_mon && tm.tm_year == now.tm_year) - tm.tm_year--; - return mktime(&tm); + pending_number(&tm, &number); + if (!touched) + *error_ret = 1; + return update_tm(&tm, &now, 0); +} + +unsigned long approxidate_relative(const char *date, const struct timeval *tv) +{ + unsigned long timestamp; + int offset; + int errors = 0; + + if (!parse_date_basic(date, ×tamp, &offset)) + return timestamp; + return approxidate_str(date, tv, &errors); +} + +unsigned long approxidate_careful(const char *date, int *error_ret) +{ + struct timeval tv; + unsigned long 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); } |