* Copyright (C) Linus Torvalds, 2005
*/
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <ctype.h>
#include <time.h>
+#include "cache.h"
+
static time_t my_mktime(struct tm *tm)
{
static const int mdays[] = {
}
static const char *month_names[] = {
- "Jan", "Feb", "Mar", "Apr", "May", "Jun",
- "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+ "January", "February", "March", "April", "May", "June",
+ "July", "August", "September", "October", "November", "December"
};
static const char *weekday_names[] = {
- "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
+ "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
};
-
-static char *skipfws(char *str)
+/*
+ * 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)
{
- while (isspace(*str))
- str++;
- return str;
+ 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.
+ *
+ * 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) */
+
+ { "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", +11, 0, }, /* New Zealand */
+ { "NZST", +11, 0, }, /* New Zealand Standard */
+ { "NZDT", +11, 1, }, /* New Zealand Daylight */
+ { "IDLE", +12, 0, }, /* International Date Line East */
+};
+
+#define NR_TZ (sizeof(timezone_names) / sizeof(timezone_names[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. */
-void parse_date(char *date, char *result, int maxlen)
+static int match_string(const char *date, const char *str)
{
- struct tm tm;
- char *p, *tz;
- int i, offset;
- time_t then;
+ 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;
+}
- memset(&tm, 0, sizeof(tm));
+static int skip_alpha(const char *date)
+{
+ int i = 0;
+ do {
+ i++;
+ } while (isalpha(date[i]));
+ return i;
+}
- /* Skip day-name */
- p = skipfws(date);
- if (!isdigit(*p)) {
- for (i=0; i<7; i++) {
- if (!strncmp(p,weekday_names[i],3) && p[3] == ',') {
- p = skipfws(p+4);
- goto day;
- }
- }
- return;
- }
+/*
+* Parse month, weekday, or timezone name
+*/
+static int match_alpha(const char *date, struct tm *tm, int *offset)
+{
+ int i;
- /* day */
- day:
- tm.tm_mday = strtoul(p, &p, 10);
+ for (i = 0; i < 12; i++) {
+ int match = match_string(date, month_names[i]);
+ if (match >= 3) {
+ tm->tm_mon = i;
+ return match;
+ }
+ }
- if (tm.tm_mday < 1 || tm.tm_mday > 31)
- return;
+ for (i = 0; i < 7; i++) {
+ int match = match_string(date, weekday_names[i]);
+ if (match >= 3) {
+ tm->tm_wday = i;
+ return match;
+ }
+ }
- if (!isspace(*p))
- return;
+ for (i = 0; i < NR_TZ; i++) {
+ int match = match_string(date, timezone_names[i].name);
+ if (match >= 3) {
+ int off = timezone_names[i].offset;
- p = skipfws(p);
+ /* This is bogus, but we like summer */
+ off += timezone_names[i].dst;
- /* month */
+ /* Only use the tz name offset if we don't have anything better */
+ if (*offset == -1)
+ *offset = 60*off;
- for (i=0; i<12; i++) {
- if (!strncmp(p, month_names[i], 3) && isspace(p[3])) {
- tm.tm_mon = i;
- p = skipfws(p+strlen(month_names[i]));
- goto year;
+ return match;
}
}
- return; /* Error -- bad month */
- /* year */
- year:
- tm.tm_year = strtoul(p, &p, 10);
+ if (match_string(date, "PM") == 2) {
+ if (tm->tm_hour > 0 && tm->tm_hour < 12)
+ tm->tm_hour += 12;
+ return 2;
+ }
- if (!tm.tm_year && !isspace(*p))
- return;
+ /* BAD CRAP */
+ return skip_alpha(date);
+}
- if (tm.tm_year > 1900)
- tm.tm_year -= 1900;
-
- p=skipfws(p);
+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;
+}
- /* hour */
- if (!isdigit(*p))
- return;
- tm.tm_hour = strtoul(p, &p, 10);
-
- if (tm.tm_hour > 23)
- return;
+static int match_multi_number(unsigned long num, char c, const char *date, char *end, struct tm *tm)
+{
+ 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;
+}
- if (*p != ':')
- return; /* Error -- bad time */
- p++;
+/*
+ * 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 anything after Jan 1, 2000
+ */
+ if (num > 946684800) {
+ time_t time = num;
+ if (gmtime_r(&time, tm)) {
+ *tm_gmt = 1;
+ return end - date;
+ }
+ }
- /* minute */
- if (!isdigit(*p))
- return;
- tm.tm_min = strtoul(p, &p, 10);
-
- if (tm.tm_min > 59)
- return;
+ /*
+ * 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 (*p != ':')
- goto zone;
- p++;
+ /*
+ * 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;
+ return n;
+ }
- /* second */
- if (!isdigit(*p))
- return;
- tm.tm_sec = strtoul(p, &p, 10);
-
- if (tm.tm_sec > 60)
- return;
+ /*
+ * NOTE! We will give precedence to day-of-month over month or
+ * year numebers 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 < 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 n;
+}
- zone:
- if (!isspace(*p))
- return;
+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;
+
+ /*
+ * 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;
+}
- p = skipfws(p);
+static int date_string(unsigned long date, int offset, char *buf, int len)
+{
+ int sign = '+';
- if (*p == '-')
- offset = -60;
- else if (*p == '+')
- offset = 60;
- else
- return;
+ if (offset < 0) {
+ offset = -offset;
+ sign = '-';
+ }
+ return snprintf(buf, len, "%lu %c%02d%02d", date, sign, offset / 60, offset % 60);
+}
- if (!isdigit(p[1]) || !isdigit(p[2]) || !isdigit(p[3]) || !isdigit(p[4]))
- return;
+/* 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)
+{
+ struct tm tm;
+ int offset, tm_gmt;
+ time_t then;
- tz = p;
- i = strtoul(p+1, NULL, 10);
- offset *= ((i % 100) + ((i / 100) * 60));
+ memset(&tm, 0, sizeof(tm));
+ tm.tm_year = -1;
+ tm.tm_mon = -1;
+ tm.tm_mday = -1;
+ tm.tm_isdst = -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;
+ }
- p = skipfws(p + 5);
- if (*p && *p != '(') /* trailing comment like (EDT) is ok */
- return;
+ /* mktime uses local timezone */
+ then = my_mktime(&tm);
+ if (offset == -1)
+ offset = (then - mktime(&tm)) / 60;
- then = my_mktime(&tm); /* mktime uses local timezone */
if (then == -1)
- return;
-
- then -= offset;
+ return -1;
- snprintf(result, maxlen, "%lu %5.5s", then, tz);
+ 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);
}