* Copyright (C) Linus Torvalds, 2005
*/
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <ctype.h>
#include <time.h>
+#include <sys/time.h>
+
+#include "cache.h"
static time_t my_mktime(struct tm *tm)
{
};
static const char *weekday_names[] = {
- "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
+ "Sundays", "Mondays", "Tuesdays", "Wednesdays", "Thursdays", "Fridays", "Saturdays"
};
+/*
+ * 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"
+ */
+const char *show_date(unsigned long time, int tz)
+{
+ struct tm *tm;
+ time_t t;
+ static char timebuf[200];
+ int minutes;
+
+ minutes = tz < 0 ? -tz : tz;
+ minutes = (minutes / 100)*60 + (minutes % 100);
+ minutes = tz < 0 ? -minutes : minutes;
+ t = time + minutes * 60;
+ tm = gmtime(&t);
+ 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);
+ return timebuf;
+}
+
/*
* Check these. And note how it doesn't do the summer-time conversion.
*
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
*/
}
}
+ if (match_string(date, "PM") == 2) {
+ if (tm->tm_hour > 0 && tm->tm_hour < 12)
+ tm->tm_hour += 12;
+ return 2;
+ }
+
/* BAD CRAP */
+ return skip_alpha(date);
+}
+
+static int is_date(int year, int month, int day, struct tm *tm)
+{
+ if (month > 0 && month < 13 && day > 0 && day < 32) {
+ if (year == -1) {
+ tm->tm_mon = month-1;
+ tm->tm_mday = day;
+ return 1;
+ }
+ if (year >= 1970 && year < 2100) {
+ year -= 1900;
+ } else if (year > 70 && year < 100) {
+ /* ok */
+ } else if (year < 38) {
+ year += 100;
+ } else
+ return 0;
+
+ tm->tm_mon = month-1;
+ tm->tm_mday = day;
+ tm->tm_year = year;
+ return 1;
+ }
return 0;
}
-static int match_digit(char *date, struct tm *tm, int *offset)
+static int match_multi_number(unsigned long num, char c, const char *date, char *end, struct tm *tm)
{
- char *end, c;
- unsigned long num, num2, num3;
+ 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 '/':
+ if (num > 70) {
+ /* yyyy-mm-dd? */
+ if (is_date(num, num2, num3, tm))
+ break;
+ /* yyyy-dd-mm? */
+ if (is_date(num, num3, num2, tm))
+ break;
+ }
+ /* mm/dd/yy ? */
+ if (is_date(num3, num2, num, tm))
+ break;
+ /* dd/mm/yy ? */
+ if (is_date(num3, num, num2, tm))
+ break;
+ return 0;
+ }
+ return end - date;
+}
+
+/*
+ * 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);
- /* Time? num:num[:num] */
- if (num < 24 && end[0] == ':' && isdigit(end[1])) {
- tm->tm_hour = num;
- num = strtoul(end+1, &end, 10);
- if (num < 60) {
- tm->tm_min = num;
- if (end[0] == ':' && isdigit(end[1])) {
- num = strtoul(end+1, &end, 10);
- if (num < 61)
- tm->tm_sec = num;
- }
+ /*
+ * Seconds since 1970? We trigger on that for anything after Jan 1, 2000
+ */
+ if (num > 946684800) {
+ time_t time = num;
+ if (gmtime_r(&time, tm)) {
+ *tm_gmt = 1;
+ return end - date;
}
- return end - date;
}
- /* Year? Day of month? Numeric date-string?*/
- c = *end;
- switch (c) {
- default:
- if (num > 0 && num < 32) {
- tm->tm_mday = num;
- break;
+ /*
+ * Check for special formats: num[:-/]num[same]num
+ */
+ switch (*end) {
+ case ':':
+ case '/':
+ case '-':
+ if (isdigit(end[1])) {
+ int match = match_multi_number(num, *end, date, end, tm);
+ if (match)
+ return match;
}
- if (num > 1900) {
+ }
+
+ /*
+ * 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 <= 1200 && *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;
- break;
+ 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) {
+ if (num >= 70) {
tm->tm_year = num;
- break;
+ return n;
}
- break;
+ }
- case '-':
- case '/':
- if (num && num < 32 && isdigit(end[1])) {
- num2 = strtoul(end+1, &end, 10);
- if (!num2 || num2 > 31)
- break;
- if (num > 12) {
- if (num2 > 12)
- break;
- num3 = num;
- num = num2;
- num2 = num3;
- }
- tm->tm_mon = num - 1;
- tm->tm_mday = num2;
- if (*end == c && isdigit(end[1])) {
- num3 = strtoul(end+1, &end, 10);
- if (num3 > 1900)
- num3 -= 1900;
- else if (num3 < 38)
- num3 += 100;
- tm->tm_year = num3;
- }
- break;
- }
+ 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) {
+ tm->tm_mon = num-1;
}
- return end - date;
-
+ return n;
}
-static int match_tz(char *date, int *offp)
+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;
min = offset % 100;
hour = offset / 100;
- offset = hour*60+min;
- if (*date == '-')
- offset = -offset;
-
- *offp = offset;
+ /*
+ * 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.
+ */
+ if (min < 60 && n > 2) {
+ 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. */
-void parse_date(char *date, char *result, int maxlen)
+int parse_date(const char *date, char *result, int maxlen)
{
struct tm tm;
- int offset, sign;
+ int offset, tm_gmt;
time_t then;
memset(&tm, 0, sizeof(tm));
tm.tm_mday = -1;
tm.tm_isdst = -1;
offset = -1;
+ tm_gmt = 0;
for (;;) {
int match = 0;
if (isalpha(c))
match = match_alpha(date, &tm, &offset);
else if (isdigit(c))
- match = match_digit(date, &tm, &offset);
+ match = match_digit(date, &tm, &offset, &tm_gmt);
else if ((c == '-' || c == '+') && isdigit(date[1]))
match = match_tz(date, &offset);
offset = (then - mktime(&tm)) / 60;
if (then == -1)
- return;
-
- then -= offset * 60;
-
- sign = '+';
- if (offset < 0) {
- offset = -offset;
- sign = '-';
- }
+ return -1;
- snprintf(result, maxlen, "%lu %c%02d%02d", then, sign, offset/60, offset % 60);
+ if (!tm_gmt)
+ then -= offset * 60;
+ return date_string(then, offset, result, maxlen);
}
void datestamp(char *buf, int bufsize)
offset = my_mktime(localtime(&now)) - now;
offset /= 60;
- snprintf(buf, bufsize, "%lu %+05d", now, offset/60*100 + offset%60);
+ date_string(now, offset, buf, bufsize);
+}
+
+static void update_tm(struct tm *tm, unsigned long sec)
+{
+ time_t n = mktime(tm) - sec;
+ localtime_r(&n, tm);
+}
+
+static void date_yesterday(struct tm *tm, int *num)
+{
+ update_tm(tm, 24*60*60);
+}
+
+static void date_time(struct tm *tm, int hour)
+{
+ if (tm->tm_hour < hour)
+ date_yesterday(tm, NULL);
+ tm->tm_hour = hour;
+ tm->tm_min = 0;
+ tm->tm_sec = 0;
+}
+
+static void date_midnight(struct tm *tm, int *num)
+{
+ date_time(tm, 0);
+}
+
+static void date_noon(struct tm *tm, int *num)
+{
+ date_time(tm, 12);
+}
+
+static void date_tea(struct tm *tm, int *num)
+{
+ date_time(tm, 17);
+}
+
+static const struct special {
+ const char *name;
+ void (*fn)(struct tm *, int *);
+} special[] = {
+ { "yesterday", date_yesterday },
+ { "noon", date_noon },
+ { "midnight", date_midnight },
+ { "tea", date_tea },
+ { 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, int *num)
+{
+ const struct typelen *tl;
+ const struct special *s;
+ const char *end = date;
+ int n = 1, i;
+
+ while (isalpha(*++end))
+ n++;
+
+ for (i = 0; i < 12; i++) {
+ int match = match_string(date, month_names[i]);
+ if (match >= 3) {
+ tm->tm_mon = i;
+ return end;
+ }
+ }
+
+ for (s = special; s->name; s++) {
+ int len = strlen(s->name);
+ if (match_string(date, s->name) == len) {
+ s->fn(tm, num);
+ 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;
+ return end;
+ }
+ }
+ if (match_string(date, "last") == 4)
+ *num = 1;
+ return end;
+ }
+
+ tl = typelen;
+ while (tl->type) {
+ int len = strlen(tl->type);
+ if (match_string(date, tl->type) >= len-1) {
+ update_tm(tm, tl->length * *num);
+ *num = 0;
+ 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, diff * 24 * 60 * 60);
+ return end;
+ }
+ }
+
+ if (match_string(date, "months") >= 5) {
+ int n = tm->tm_mon - *num;
+ *num = 0;
+ while (n < 0) {
+ n += 12;
+ tm->tm_year--;
+ }
+ tm->tm_mon = n;
+ return end;
+ }
+
+ if (match_string(date, "years") >= 4) {
+ tm->tm_year -= *num;
+ *num = 0;
+ return end;
+ }
+
+ return end;
+}
+
+unsigned long approxidate(const char *date)
+{
+ int number = 0;
+ struct tm tm, now;
+ struct timeval tv;
+ char buffer[50];
+
+ if (parse_date(date, buffer, sizeof(buffer)) > 0)
+ return strtoul(buffer, NULL, 10);
+
+ gettimeofday(&tv, NULL);
+ localtime_r(&tv.tv_sec, &tm);
+ now = tm;
+ for (;;) {
+ unsigned char c = *date;
+ if (!c)
+ break;
+ date++;
+ if (isdigit(c)) {
+ char *end;
+ number = strtoul(date-1, &end, 10);
+ date = end;
+ continue;
+ }
+ if (isalpha(c))
+ date = approxidate_alpha(date-1, &tm, &number);
+ }
+ 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);
}