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-rw-r--r--toys/posix/date.c133
1 files changed, 10 insertions, 123 deletions
diff --git a/toys/posix/date.c b/toys/posix/date.c
index 43b558a5..685ac8bf 100644
--- a/toys/posix/date.c
+++ b/toys/posix/date.c
@@ -59,135 +59,29 @@ GLOBALS(
unsigned nano;
)
-static void check_range(int a, int low, int high)
-{
- if (a<low) error_exit("%d<%d", a, low);
- if (a>high) error_exit("%d>%d", a, high);
-}
-
-static void check_tm(struct tm *tm)
-{
- check_range(tm->tm_sec, 0, 60);
- check_range(tm->tm_min, 0, 59);
- check_range(tm->tm_hour, 0, 23);
- check_range(tm->tm_mday, 1, 31);
- check_range(tm->tm_mon, 0, 11);
-}
-
-// Returns 0 success, nonzero for error.
-static int parse_formats(char *str, time_t *t)
-{
- struct tm tm;
- time_t now;
- int len = 0, i;
- char *formats[] = {
- // Formats with years must come first.
- "%Y-%m-%d %H:%M:%S", "%Y-%m-%d %H:%M", "%Y-%m-%d",
- "%H:%M:%S", "%H:%M"
- };
-
- // 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(str, "@%lld%n", &ll, &len);
- if (str[len]=='.') {
- str += len+1;
- for (len = 0; len<9; len++) {
- TT.nano *= 10;
- if (isdigit(str[len])) TT.nano += str[len]-'0';
- }
- }
- if (str[len]) return 1;
- *t = ll;
- return 0;
- }
-
- // Is it one of the fancy formats?
- for (i = 0; i<ARRAY_LEN(formats); i++) {
- char *p;
-
- now = time(0);
- localtime_r(&now, &tm);
- tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
- tm.tm_isdst = -1;
- if ((p = strptime(str,formats[i],&tm)) && !*p) {
- if ((*t = mktime(&tm)) != -1) return 0;
- }
- }
-
- // Posix format?
- sscanf(str, "%2u%2u%2u%2u%n", &tm.tm_mon, &tm.tm_mday, &tm.tm_hour,
- &tm.tm_min, &len);
- if (len != 8) return 1;
- str += len;
- tm.tm_mon--;
-
- // If year specified, overwrite one we fetched earlier.
- if (*str && *str != '.') {
- unsigned year;
-
- len = 0;
- sscanf(str, "%u%n", &year, &len);
- if (len == 4) tm.tm_year = year - 1900;
- else if (len != 2) return 1;
- str += 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 (*str == '.') {
- len = 0;
- sscanf(str, ".%u%n", &tm.tm_sec, &len);
- str += len;
- } else tm.tm_sec = 0;
-
- // Does that look like a valid date?
- check_tm(&tm);
- if ((*t = mktime(&tm)) == -1) return 1;
-
- // Shouldn't be any trailing garbage.
- return *str;
-}
-
// Handles any leading `TZ="blah" ` in the input string.
-static int parse_date(char *str, time_t *t)
+static void parse_date(char *str, time_t *t)
{
- char *new_tz = NULL, *old_tz;
- int result;
+ char *new_tz = NULL, *old_tz, *s = str;
if (!strncmp(str, "TZ=\"", 4)) {
// Extract the time zone and skip any whitespace.
new_tz = str+4;
- str = strchr(new_tz, '"');
- if (!str) return 1;
- *str++ = '\0';
- while (isspace(*str)) ++str;
+ if (!(str = strchr(new_tz, '"'))) xvali_date(0, s);
+ *str++ = 0;
+ while (isspace(*str)) str++;
// Switch $TZ.
old_tz = getenv("TZ");
setenv("TZ", new_tz, 1);
tzset();
}
- result = parse_formats(str, t);
+ time(t);
+ xparsedate(str, t, &TT.nano);
if (new_tz) {
if (old_tz) setenv("TZ", old_tz, 1);
else unsetenv("TZ");
}
- return result;
}
// Print strftime plus %N escape(s). note: modifies fmt for %N
@@ -236,10 +130,8 @@ void date_main(void)
struct tm tm = {};
char *s = strptime(TT.d, TT.D+(*TT.D=='+'), &tm);
- if (!s || *s) goto bad_showdate;
- check_tm(&tm);
- if ((t = mktime(&tm)) == -1) goto bad_showdate;
- } else if (parse_date(TT.d, &t)) goto bad_showdate;
+ t = (s && *s) ? xvali_date(&tm, s) : xvali_date(0, TT.d);
+ } else parse_date(TT.d, &t);
} else {
struct timespec ts;
struct stat st;
@@ -264,7 +156,7 @@ void date_main(void)
} else if (setdate) {
struct timeval tv;
- if (parse_date(setdate, &t)) goto bad_setdate;
+ parse_date(setdate, &t);
tv.tv_sec = t;
tv.tv_usec = TT.nano/1000;
if (settimeofday(&tv, NULL) < 0) perror_msg("cannot set date");
@@ -279,9 +171,4 @@ void date_main(void)
}
return;
-
-bad_showdate:
- setdate = TT.d;
-bad_setdate:
- error_exit("bad date '%s'", setdate);
}