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-rw-r--r--date.c364
1 files changed, 266 insertions, 98 deletions
diff --git a/date.c b/date.c
index 35a5257..896fbb4 100644
--- a/date.c
+++ b/date.c
@@ -9,7 +9,7 @@
/*
* This is like mktime, but without normalization of tm_wday and tm_yday.
*/
-time_t tm_to_time_t(const struct tm *tm)
+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 @@ time_t tm_to_time_t(const 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;
}
@@ -84,51 +86,83 @@ static int local_tzoffset(unsigned long time)
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) {
- unsigned long diff;
struct timeval now;
gettimeofday(&now, NULL);
- if (now.tv_sec < time)
- return "in the future";
- diff = now.tv_sec - time;
- 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.. */
+ return show_date_relative(time, tz, &now,
+ timebuf, sizeof(timebuf));
}
if (mode == DATE_LOCAL)
@@ -196,6 +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 */
@@ -272,7 +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 */
@@ -403,6 +438,21 @@ static int match_multi_number(unsigned long num, char c, const char *date, char
}
/*
+ * 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)
@@ -418,7 +468,7 @@ static int match_digit(const char *date, struct tm *tm, int *offset, int *tm_gmt
* more than 8 digits. This is because we don't want to rule out
* numbers like 20070606 as a YYYYMMDD date.
*/
- if (num >= 100000000) {
+ if (num >= 100000000 && nodate(tm)) {
time_t time = num;
if (gmtime_r(&time, tm)) {
*tm_gmt = 1;
@@ -463,6 +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..
@@ -486,15 +543,8 @@ 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;
}
@@ -537,18 +587,27 @@ 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 (;;) {
@@ -560,11 +619,11 @@ 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 */
@@ -575,16 +634,25 @@ int parse_date(const char *date, char *result, int maxlen)
}
/* mktime uses local timezone */
- then = tm_to_time_t(&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, &timestamp, &offset))
+ return -1;
+ return date_string(timestamp, offset, result, maxlen);
}
enum date_mode parse_date_format(const char *format)
@@ -603,6 +671,8 @@ enum date_mode parse_date_format(const char *format)
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);
}
@@ -620,42 +690,64 @@ void datestamp(char *buf, int bufsize)
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_yesterday(struct tm *tm, int *num)
+static void date_now(struct tm *tm, struct tm *now, int *num)
{
- update_tm(tm, 24*60*60);
+ update_tm(tm, now, 0);
}
-static void date_time(struct tm *tm, int hour)
+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, 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;
@@ -669,7 +761,7 @@ 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;
@@ -683,7 +775,7 @@ static void date_am(struct tm *tm, int *num)
tm->tm_hour = (hour % 12);
}
-static void date_never(struct tm *tm, int *num)
+static void date_never(struct tm *tm, struct tm *now, int *num)
{
time_t n = 0;
localtime_r(&n, tm);
@@ -691,7 +783,7 @@ static void date_never(struct tm *tm, int *num)
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 },
@@ -700,6 +792,7 @@ static const struct special {
{ "PM", date_pm },
{ "AM", date_am },
{ "never", date_never },
+ { "now", date_now },
{ NULL }
};
@@ -720,7 +813,7 @@ static const struct typelen {
{ 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;
@@ -734,6 +827,7 @@ 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;
}
}
@@ -741,7 +835,8 @@ 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;
}
}
@@ -751,11 +846,14 @@ 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;
}
@@ -763,8 +861,9 @@ 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++;
@@ -781,25 +880,31 @@ 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;
}
@@ -823,38 +928,101 @@ 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);
+ }
+ 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, &timestamp, &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, &timestamp, &offset)) {
+ *error_ret = 0;
+ return timestamp;
}
- 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);
+
+ gettimeofday(&tv, NULL);
+ return approxidate_str(date, &tv, error_ret);
}
generated by cgit v0.10.2-6-g49f6 at 2024-04-23 23:27:54 (GMT)