/*

* 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(unsigned long time, int tz)

{

int minutes;

minutes = tz < 0 ? -tz : tz;

minutes = (minutes / 100)*60 + (minutes % 100);

minutes = tz < 0 ? -minutes : minutes;

return time + minutes * 60;

}

/*

* 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(unsigned long time, int tz)

{

time_t t = gm_time_t(time, tz);

return gmtime(&t);

}

/*

* What value of "tz" was in effect back then at "time" in the

* local timezone?

*/

static int local_tzoffset(unsigned long time)

{

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;

}

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_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;

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;

}

/*

* 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 (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(unsigned long 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 '.':

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, refuse_future, now, tm))

break;

/* yyyy-dd-mm? */

if (is_date(num, num3, num2, refuse_future, 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;

unsigned long num;

num = strtoul(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);

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 int date_string(unsigned long date, int offset, char *buf, int len)

{

int sign = '+';

if (offset < 0) {

offset = -offset;

sign = '-';

}

return snprintf(buf, len, "%lu %c%02d%02d", date, sign, offset / 60, offset % 60);

}

/* 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, unsigned long *timestamp, int *offset)

{

struct tm tm;

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;

tm.tm_hour = -1;

tm.tm_min = -1;

tm.tm_sec = -1;

*offset = -1;

tm_gmt = 0;

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;

}

/* mktime uses local timezone */

*timestamp = tm_to_time_t(&tm);

if (*offset == -1)

*offset = ((time_t)*timestamp - mktime(&tm)) / 60;

if (*timestamp == -1)

return -1;

if (!tm_gmt)

*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, &timestamp, &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)

{

time_t now;

int offset;

time(&now);

offset = tm_to_time_t(localtime(&now)) - now;

offset /= 60;

date_string(now, offset, buf, bufsize);

}

/*

* 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;

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)

{

char *end;

unsigned long number = strtoul(date, &end, 10);

switch (*end) {

case ':':

case '.':

case '/':

case '-':

if (isdigit(end[1])) {

int match = match_multi_number(number, *end, date, end, tm);

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 unsigned long 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);