static int parse_time(const char **p, CalendarSpec *c) {
CalendarComponent *h = NULL, *m = NULL, *s = NULL;
const char *t;
int r;
assert(p);
assert(*p);
assert(c);
t = *p;
if (*t == 0) {
/* If no time is specified at all, but a date of some
* kind, then this means 00:00:00 */
if (c->day || c->weekdays_bits > 0)
goto null_hour;
goto finish;
}
r = parse_chain(&t, &h);
if (r < 0)
goto fail;
if (*t != ':') {
r = -EINVAL;
goto fail;
}
t++;
r = parse_chain(&t, &m);
if (r < 0)
goto fail;
/* Already at the end? Then it's hours and minutes, and seconds are 0 */
if (*t == 0) {
if (m != NULL)
goto null_second;
goto finish;
}
if (*t != ':') {
r = -EINVAL;
goto fail;
}
t++;
r = parse_chain(&t, &s);
if (r < 0)
goto fail;
/* At the end? Then it's hours, minutes and seconds */
if (*t == 0)
goto finish;
r = -EINVAL;
goto fail;
null_hour:
r = const_chain(0, &h);
if (r < 0)
goto fail;
r = const_chain(0, &m);
if (r < 0)
goto fail;
null_second:
r = const_chain(0, &s);
if (r < 0)
goto fail;
finish:
*p = t;
c->hour = h;
c->minute = m;
c->second = s;
return 0;
fail:
free_chain(h);
free_chain(m);
free_chain(s);
return r;
}
static int parse_calendar_time(const char **p, CalendarSpec *c) {
CalendarComponent *h = NULL, *m = NULL, *s = NULL;
const char *t;
int r;
assert(p);
assert(*p);
assert(c);
t = *p;
/* If no time is specified at all, then this means 00:00:00 */
if (*t == 0)
goto null_hour;
r = parse_chain(&t, false, &h);
if (r < 0)
goto fail;
if (*t != ':') {
r = -EINVAL;
goto fail;
}
t++;
r = parse_chain(&t, false, &m);
if (r < 0)
goto fail;
/* Already at the end? Then it's hours and minutes, and seconds are 0 */
if (*t == 0)
goto null_second;
if (*t != ':') {
r = -EINVAL;
goto fail;
}
t++;
r = parse_chain(&t, true, &s);
if (r < 0)
goto fail;
/* At the end? Then it's hours, minutes and seconds */
if (*t == 0)
goto finish;
r = -EINVAL;
goto fail;
null_hour:
r = const_chain(0, &h);
if (r < 0)
goto fail;
r = const_chain(0, &m);
if (r < 0)
goto fail;
null_second:
r = const_chain(0, &s);
if (r < 0)
goto fail;
finish:
*p = t;
c->hour = h;
c->minute = m;
c->microsecond = s;
return 0;
fail:
free_chain(h);
free_chain(m);
free_chain(s);
return r;
}
static int parse_date(const char **p, CalendarSpec *c) {
const char *t;
int r;
CalendarComponent *first, *second, *third;
assert(p);
assert(*p);
assert(c);
t = *p;
if (*t == 0)
return 0;
r = parse_chain(&t, &first);
if (r < 0)
return r;
/* Already the end? A ':' as separator? In that case this was a time, not a date */
if (*t == 0 || *t == ':') {
free_chain(first);
return 0;
}
if (*t != '-') {
free_chain(first);
return -EINVAL;
}
t++;
r = parse_chain(&t, &second);
if (r < 0) {
free_chain(first);
return r;
}
/* Got two parts, hence it's month and day */
if (*t == ' ' || *t == 0) {
*p = t + strspn(t, " ");
c->month = first;
c->day = second;
return 0;
}
if (*t != '-') {
free_chain(first);
free_chain(second);
return -EINVAL;
}
t++;
r = parse_chain(&t, &third);
if (r < 0) {
free_chain(first);
free_chain(second);
return r;
}
/* Got tree parts, hence it is year, month and day */
if (*t == ' ' || *t == 0) {
*p = t + strspn(t, " ");
c->year = first;
c->month = second;
c->day = third;
return 0;
}
free_chain(first);
free_chain(second);
free_chain(third);
return -EINVAL;
}
static int parse_date(const char **p, CalendarSpec *c) {
const char *t;
int r;
CalendarComponent *first, *second, *third;
assert(p);
assert(*p);
assert(c);
t = *p;
if (*t == 0)
return 0;
/* @TIMESTAMP — UNIX time in seconds since the epoch */
if (*t == '@') {
unsigned long value;
time_t time;
r = parse_one_number(t + 1, &t, &value);
if (r < 0)
return r;
time = value;
if ((unsigned long) time != value)
return -ERANGE;
r = calendarspec_from_time_t(c, time);
if (r < 0)
return r;
*p = t;
return 1; /* finito, don't parse H:M:S after that */
}
r = parse_chain(&t, false, &first);
if (r < 0)
return r;
/* Already the end? A ':' as separator? In that case this was a time, not a date */
if (IN_SET(*t, 0, ':')) {
free_chain(first);
return 0;
}
if (*t == '~')
c->end_of_month = true;
else if (*t != '-') {
free_chain(first);
return -EINVAL;
}
t++;
r = parse_chain(&t, false, &second);
if (r < 0) {
free_chain(first);
return r;
}
/* Got two parts, hence it's month and day */
if (IN_SET(*t, 0, ' ')) {
*p = t + strspn(t, " ");
c->month = first;
c->day = second;
return 0;
} else if (c->end_of_month) {
free_chain(first);
free_chain(second);
return -EINVAL;
}
if (*t == '~')
c->end_of_month = true;
else if (*t != '-') {
free_chain(first);
free_chain(second);
return -EINVAL;
}
t++;
r = parse_chain(&t, false, &third);
if (r < 0) {
free_chain(first);
free_chain(second);
return r;
}
/* Got three parts, hence it is year, month and day */
if (IN_SET(*t, 0, ' ')) {
*p = t + strspn(t, " ");
c->year = first;
c->month = second;
c->day = third;
return 0;
}
free_chain(first);
free_chain(second);
free_chain(third);
return -EINVAL;
}
