aboutsummaryrefslogtreecommitdiff
path: root/date.c
diff options
context:
space:
mode:
Diffstat (limited to 'date.c')
-rw-r--r--date.c321
1 files changed, 215 insertions, 106 deletions
diff --git a/date.c b/date.c
index 1e43936f8..b59e832d6 100644
--- a/date.c
+++ b/date.c
@@ -30,144 +30,253 @@ static time_t my_mktime(struct tm *tm)
}
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"
};
+/*
+ * 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;
+} timezone_names[] = {
+ { "IDLW", -12 }, /* International Date Line West */
+ { "NT", -11 }, /* Nome */
+ { "CAT", -10 }, /* Central Alaska */
+ { "HST", -10 }, /* Hawaii Standard */
+ { "HDT", -9 }, /* Hawaii Daylight */
+ { "YDT", -8 }, /* Yukon Daylight */
+ { "YST", -9 }, /* Yukon Standard */
+ { "PST", -8 }, /* Pacific Standard */
+ { "PDT", -7 }, /* Pacific Daylight */
+ { "MST", -7 }, /* Mountain Standard */
+ { "MDT", -6 }, /* Mountain Daylight */
+ { "CST", -6 }, /* Central Standard */
+ { "CDT", -5 }, /* Central Daylight */
+ { "EST", -5 }, /* Eastern Standard */
+ { "EDT", -4 }, /* Eastern Daylight */
+ { "AST", -3 }, /* Atlantic Standard */
+ { "ADT", -2 }, /* Atlantic Daylight */
+ { "WAT", -1 }, /* West Africa */
+
+ { "GMT", 0 }, /* Greenwich Mean */
+ { "UTC", 0 }, /* Universal (Coordinated) */
+
+ { "WET", 0 }, /* Western European */
+ { "BST", 0 }, /* British Summer */
+ { "CET", +1 }, /* Central European */
+ { "MET", +1 }, /* Middle European */
+ { "MEWT", +1 }, /* Middle European Winter */
+ { "MEST", +2 }, /* Middle European Summer */
+ { "CEST", +2 }, /* Central European Summer */
+ { "MESZ", +1 }, /* Middle European Summer */
+ { "FWT", +1 }, /* French Winter */
+ { "FST", +2 }, /* French Summer */
+ { "EET", +2 }, /* Eastern Europe, USSR Zone 1 */
+ { "WAST", +7 }, /* West Australian Standard */
+ { "WADT", +8 }, /* West Australian Daylight */
+ { "CCT", +8 }, /* China Coast, USSR Zone 7 */
+ { "JST", +9 }, /* Japan Standard, USSR Zone 8 */
+ { "EAST", +10 }, /* Eastern Australian Standard */
+ { "EADT", +11 }, /* Eastern Australian Daylight */
+ { "GST", +10 }, /* Guam Standard, USSR Zone 9 */
+ { "NZT", +11 }, /* New Zealand */
+ { "NZST", +11 }, /* New Zealand Standard */
+ { "NZDT", +12 }, /* New Zealand Daylight */
+ { "IDLE", +12 }, /* International Date Line East */
+};
-static char *skipfws(char *str)
+#define NR_TZ (sizeof(timezone_names) / sizeof(timezone_names[0]))
+
+static int match_string(const char *date, const char *str)
{
- while (isspace(*str))
- str++;
- return 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;
}
-
-/* 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)
+/*
+* Parse month, weekday, or timezone name
+*/
+static int match_alpha(const char *date, struct tm *tm, int *offset)
{
- struct tm tm;
- char *p, *tz;
- int i, offset;
- time_t then;
+ int i;
- memset(&tm, 0, sizeof(tm));
-
- /* 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;
- }
+ for (i = 0; i < 12; i++) {
+ int match = match_string(date, month_names[i]);
+ if (match >= 3) {
+ tm->tm_mon = i;
+ return match;
}
- return;
- }
-
- /* day */
- day:
- tm.tm_mday = strtoul(p, &p, 10);
-
- if (tm.tm_mday < 1 || tm.tm_mday > 31)
- return;
-
- if (!isspace(*p))
- return;
-
- p = skipfws(p);
+ }
- /* month */
+ 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<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;
+ for (i = 0; i < NR_TZ; i++) {
+ int match = match_string(date, timezone_names[i].name);
+ if (match >= 3) {
+ *offset = 60*timezone_names[i].offset;
+ return match;
}
}
- return; /* Error -- bad month */
- /* year */
- year:
- tm.tm_year = strtoul(p, &p, 10);
+ /* BAD CRAP */
+ return 0;
+}
- if (!tm.tm_year && !isspace(*p))
- return;
+static int match_digit(char *date, struct tm *tm, int *offset)
+{
+ char *end, c;
+ unsigned long num, num2, num3;
+
+ 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;
+ }
+ }
+ return end - date;
+ }
- if (tm.tm_year > 1900)
- tm.tm_year -= 1900;
+ /* Year? Day of month? Numeric date-string?*/
+ c = *end;
+ switch (c) {
+ default:
+ if (num > 0 && num < 32) {
+ tm->tm_mday = num;
+ break;
+ }
+ if (num > 1900) {
+ tm->tm_year = num - 1900;
+ break;
+ }
+ if (num > 70) {
+ tm->tm_year = num;
+ break;
+ }
+ 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, &end, 10);
+ if (num3 > 1900)
+ num3 -= 1900;
+ tm->tm_year = num3;
+ }
+ break;
+ }
+ }
- p=skipfws(p);
-
- /* hour */
- if (!isdigit(*p))
- return;
- tm.tm_hour = strtoul(p, &p, 10);
-
- if (tm.tm_hour > 23)
- return;
-
- if (*p != ':')
- return; /* Error -- bad time */
- p++;
-
- /* minute */
- if (!isdigit(*p))
- return;
- tm.tm_min = strtoul(p, &p, 10);
-
- if (tm.tm_min > 59)
- return;
-
- if (*p != ':')
- goto zone;
- p++;
-
- /* second */
- if (!isdigit(*p))
- return;
- tm.tm_sec = strtoul(p, &p, 10);
-
- if (tm.tm_sec > 60)
- return;
+ return end - date;
+
+}
- zone:
- if (!isspace(*p))
- return;
+static int match_tz(char *date, int *offp)
+{
+ char *end;
+ int offset = strtoul(date+1, &end, 10);
+ int min, hour;
- p = skipfws(p);
+ min = offset % 100;
+ hour = offset / 100;
- if (*p == '-')
- offset = -60;
- else if (*p == '+')
- offset = 60;
- else
- return;
+ offset = hour*60+min;
+ if (*date == '-')
+ offset = -offset;
- if (!isdigit(p[1]) || !isdigit(p[2]) || !isdigit(p[3]) || !isdigit(p[4]))
- return;
+ *offp = offset;
+ return end - date;
+}
- tz = p;
- i = strtoul(p+1, NULL, 10);
- offset *= ((i % 100) + ((i / 100) * 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)
+{
+ struct tm tm;
+ int offset;
+ time_t then;
- p = skipfws(p + 5);
- if (*p && *p != '(') /* trailing comment like (EDT) is ok */
- return;
+ memset(&tm, 0, sizeof(tm));
+ tm.tm_year = -1;
+ tm.tm_mon = -1;
+ tm.tm_mday = -1;
+ offset = 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);
+ else if ((c == '-' || c == '+') && isdigit(date[1]))
+ match = match_tz(date, &offset);
+
+ if (!match) {
+ /* BAD CRAP */
+ match = 1;
+ }
+
+ date += match;
+ }
then = my_mktime(&tm); /* mktime uses local timezone */
if (then == -1)
return;
- then -= offset;
+ then -= offset * 60;
- snprintf(result, maxlen, "%lu %5.5s", then, tz);
+ snprintf(result, maxlen, "%lu %+03d%02d", then, offset/60, offset % 60);
}
void datestamp(char *buf, int bufsize)
generated by cgit v1.2.1 (git 2.18.0) at 2024-10-30 19:52:21 +0000