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-rw-r--r--lib/xwrap.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/lib/xwrap.c b/lib/xwrap.c
index c133125a..ee07fda2 100644
--- a/lib/xwrap.c
+++ b/lib/xwrap.c
@@ -944,3 +944,111 @@ void xsignal(int signal, void *handler)
{
xsignal_flags(signal, handler, 0);
}
+
+
+time_t xvali_date(struct tm *tm, char *str)
+{
+ time_t t;
+
+ if (tm && (unsigned)tm->tm_sec<=60 && (unsigned)tm->tm_min<=59
+ && (unsigned)tm->tm_hour<=23 && tm->tm_mday && (unsigned)tm->tm_mday<=31
+ && (unsigned)tm->tm_mon<=11 && (t = mktime(tm)) != -1) return t;
+
+ error_exit("bad date %s", str);
+}
+
+// Parse date string (relative to current *t). Sets time_t and nanoseconds.
+void xparsedate(char *str, time_t *t, unsigned *nano)
+{
+ struct tm tm;
+ time_t now = *t;
+ int len = 0, i;
+ // Formats with years must come first.
+ char *s = str, *p, *formats[] = {"%F %T", "%FT%T", "%F %H:%M", "%F",
+ "%H:%M:%S", "%H:%M"};
+
+ *nano = 0;
+
+ // Parse @UNIXTIME[.FRACTION]
+ if (*str == '@') {
+ long long ll;
+
+ // Collect seconds and nanoseconds.
+ // &ll is not just t because we can't guarantee time_t is 64 bit (yet).
+ sscanf(s, "@%lld%n", &ll, &len);
+ if (s[len]=='.') {
+ s += len+1;
+ for (len = 0; len<9; len++) {
+ *nano *= 10;
+ if (isdigit(*s)) *nano += *s++-'0';
+ }
+ }
+ if (s[len]) goto bad_dates;
+ *t = ll;
+
+ return;
+ }
+
+ // Is it one of the fancy formats?
+ for (i = 0; i<ARRAY_LEN(formats); i++) {
+ localtime_r(&now, &tm);
+ tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
+ tm.tm_isdst = -1;
+ if ((p = strptime(s, formats[i], &tm)) && !*p) {
+ *t = xvali_date(&tm, str);
+
+ return;
+ }
+ }
+
+ // Posix format?
+ sscanf(s, "%2u%2u%2u%2u%n", &tm.tm_mon, &tm.tm_mday, &tm.tm_hour,
+ &tm.tm_min, &len);
+ if (len != 8) goto bad_dates;
+ s += len;
+ tm.tm_mon--;
+
+ // If year specified, overwrite one we fetched earlier.
+ if (*s && *s != '.') {
+ unsigned year;
+
+ len = 0;
+ sscanf(s, "%u%n", &year, &len);
+ if (len == 4) tm.tm_year = year - 1900;
+ else if (len != 2) goto bad_dates;
+ s += len;
+
+ // 2 digit years, next 50 years are "future", last 50 years are "past".
+ // A "future" date in past is a century ahead.
+ // A non-future date in the future is a century behind.
+ if (len == 2) {
+ unsigned r1 = tm.tm_year % 100, r2 = (tm.tm_year + 50) % 100,
+ century = tm.tm_year - r1;
+
+ if ((r1 < r2) ? (r1 < year && year < r2) : (year < r1 || year > r2)) {
+ if (year < r1) year += 100;
+ } else if (year > r1) year -= 100;
+ tm.tm_year = year + century;
+ }
+ }
+ // Fractional part?
+ if (*s == '.') {
+ len = 0;
+ sscanf(s, ".%2u%n", &tm.tm_sec, &len);
+ s += len;
+ for (len = 0; len<9; len++) {
+ *nano *= 10;
+ if (isdigit(*s)) *nano += *s++-'0';
+ }
+ } else tm.tm_sec = 0;
+
+ // Sanity check field ranges
+ *t = xvali_date(&tm, str);
+
+ // Shouldn't be any trailing garbage.
+ if (!*s) return;
+
+bad_dates:
+ // monkey died
+ xvali_date(0, str);
+}