static int parse_chain(const char **p, CalendarComponent **c) {
const char *t;
CalendarComponent *cc = NULL;
int r;
assert(p);
assert(c);
t = *p;
if (t[0] == '*') {
*p = t + 1;
*c = NULL;
return 0;
}
r = prepend_component(&t, &cc);
if (r < 0) {
free_chain(cc);
return r;
}
*p = t;
*c = cc;
return 0;
}
static int parse_chain(const char **p, bool usec, CalendarComponent **c) {
const char *t;
CalendarComponent *cc = NULL;
int r;
assert(p);
assert(c);
t = *p;
if (t[0] == '*') {
if (usec) {
r = const_chain(0, c);
if (r < 0)
return r;
(*c)->repeat = USEC_PER_SEC;
} else
*c = NULL;
*p = t + 1;
return 0;
}
r = prepend_component(&t, usec, 0, &cc);
if (r < 0) {
free_chain(cc);
return r;
}
*p = t;
*c = cc;
return 0;
}
static int prepend_component(const char **p, bool usec, unsigned nesting, CalendarComponent **c) {
int r, start, stop = -1, repeat = 0;
CalendarComponent *cc;
const char *e = *p;
assert(p);
assert(c);
if (nesting > CALENDARSPEC_COMPONENTS_MAX)
return -ENOBUFS;
r = parse_component_decimal(&e, usec, &start);
if (r < 0)
return r;
if (e[0] == '.' && e[1] == '.') {
e += 2;
r = parse_component_decimal(&e, usec, &stop);
if (r < 0)
return r;
repeat = usec ? USEC_PER_SEC : 1;
}
if (*e == '/') {
e++;
r = parse_component_decimal(&e, usec, &repeat);
if (r < 0)
return r;
if (repeat == 0)
return -ERANGE;
}
if (!IN_SET(*e, 0, ' ', ',', '-', '~', ':'))
return -EINVAL;
cc = new0(CalendarComponent, 1);
if (!cc)
return -ENOMEM;
cc->start = start;
cc->stop = stop;
cc->repeat = repeat;
cc->next = *c;
*p = e;
*c = cc;
if (*e ==',') {
*p += 1;
return prepend_component(p, usec, nesting + 1, c);
}
return 0;
}
static int prepend_component(const char **p, bool usec, CalendarComponent **c) {
unsigned long start, stop = -1, repeat = 0;
CalendarComponent *cc;
int r;
const char *e;
assert(p);
assert(c);
e = *p;
r = parse_component_decimal(&e, usec, &start);
if (r < 0)
return r;
if (e[0] == '.' && e[1] == '.') {
e += 2;
r = parse_component_decimal(&e, usec, &stop);
if (r < 0)
return r;
repeat = usec ? USEC_PER_SEC : 1;
}
if (*e == '/') {
e++;
r = parse_component_decimal(&e, usec, &repeat);
if (r < 0)
return r;
if (repeat == 0)
return -ERANGE;
}
if (*e != 0 && *e != ' ' && *e != ',' && *e != '-' && *e != '~' && *e != ':')
return -EINVAL;
cc = new0(CalendarComponent, 1);
if (!cc)
return -ENOMEM;
cc->start = start;
cc->stop = stop;
cc->repeat = repeat;
cc->next = *c;
*p = e;
*c = cc;
if (*e ==',') {
*p += 1;
return prepend_component(p, usec, c);
}
return 0;
}
static int prepend_component(const char **p, CalendarComponent **c) {
unsigned long value, repeat = 0;
char *e = NULL, *ee = NULL;
CalendarComponent *cc;
assert(p);
assert(c);
errno = 0;
value = strtoul(*p, &e, 10);
if (errno != 0)
return -errno;
if (e == *p)
return -EINVAL;
if ((unsigned long) (int) value != value)
return -ERANGE;
if (*e == '/') {
repeat = strtoul(e+1, &ee, 10);
if (errno != 0)
return -errno;
if (ee == e+1)
return -EINVAL;
if ((unsigned long) (int) repeat != repeat)
return -ERANGE;
if (repeat <= 0)
return -ERANGE;
e = ee;
}
if (*e != 0 && *e != ' ' && *e != ',' && *e != '-' && *e != ':')
return -EINVAL;
cc = new0(CalendarComponent, 1);
if (!cc)
return -ENOMEM;
cc->value = value;
cc->repeat = repeat;
cc->next = *c;
*p = e;
*c = cc;
if (*e ==',') {
*p += 1;
return prepend_component(p, c);
}
return 0;
}
static int prepend_component(const char **p, bool usec, CalendarComponent **c) {
unsigned long value, repeat = 0;
CalendarComponent *cc;
int r;
const char *e;
assert(p);
assert(c);
e = *p;
r = parse_component_decimal(&e, usec, &value);
if (r < 0)
return r;
if (*e == '/') {
e++;
r = parse_component_decimal(&e, usec, &repeat);
if (r < 0)
return r;
if (repeat == 0)
return -ERANGE;
}
if (*e != 0 && *e != ' ' && *e != ',' && *e != '-' && *e != ':')
return -EINVAL;
cc = new0(CalendarComponent, 1);
if (!cc)
return -ENOMEM;
cc->value = value;
cc->repeat = repeat;
cc->next = *c;
*p = e;
*c = cc;
if (*e ==',') {
*p += 1;
return prepend_component(p, usec, c);
}
return 0;
}
