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-rw-r--r--src/basic/calendarspec.c231
1 files changed, 121 insertions, 110 deletions
diff --git a/src/basic/calendarspec.c b/src/basic/calendarspec.c
index adf79eb533..3e249505a5 100644
--- a/src/basic/calendarspec.c
+++ b/src/basic/calendarspec.c
@@ -33,11 +33,9 @@
#include "parse-util.h"
#include "string-util.h"
-/* Longest valid date/time range is 1970..2199 */
-#define MAX_RANGE_LEN 230
-#define MIN_YEAR 1970
-#define MAX_YEAR 2199
-#define BITS_WEEKDAYS 127
+#define BITS_WEEKDAYS 127
+#define MIN_YEAR 1970
+#define MAX_YEAR 2199
static void free_chain(CalendarComponent *c) {
CalendarComponent *n;
@@ -67,9 +65,14 @@ void calendar_spec_free(CalendarSpec *c) {
static int component_compare(const void *_a, const void *_b) {
CalendarComponent * const *a = _a, * const *b = _b;
- if ((*a)->value < (*b)->value)
+ if ((*a)->start < (*b)->start)
return -1;
- if ((*a)->value > (*b)->value)
+ if ((*a)->start > (*b)->start)
+ return 1;
+
+ if ((*a)->stop < (*b)->stop)
+ return -1;
+ if ((*a)->stop > (*b)->stop)
return 1;
if ((*a)->repeat < (*b)->repeat)
@@ -80,15 +83,24 @@ static int component_compare(const void *_a, const void *_b) {
return 0;
}
-static void sort_chain(CalendarComponent **c) {
+static void normalize_chain(CalendarComponent **c) {
unsigned n = 0, k;
CalendarComponent **b, *i, **j, *next;
assert(c);
- for (i = *c; i; i = i->next)
+ for (i = *c; i; i = i->next) {
n++;
+ /*
+ * While we're counting the chain, also normalize `stop`
+ * so the length of the range is a multiple of `repeat`
+ */
+ if (i->stop > i->start)
+ i->stop -= (i->stop - i->start) % i->repeat;
+
+ }
+
if (n <= 1)
return;
@@ -103,7 +115,7 @@ static void sort_chain(CalendarComponent **c) {
/* Drop non-unique entries */
for (k = n-1; k > 0; k--) {
- if (b[k-1]->value == next->value &&
+ if (b[k-1]->start == next->start &&
b[k-1]->repeat == next->repeat) {
free(b[k-1]);
continue;
@@ -120,15 +132,19 @@ static void fix_year(CalendarComponent *c) {
/* Turns 12 → 2012, 89 → 1989 */
while (c) {
- CalendarComponent *n = c->next;
+ if (c->start >= 0 && c->start < 70)
+ c->start += 2000;
- if (c->value >= 0 && c->value < 70)
- c->value += 2000;
+ if (c->stop >= 0 && c->stop < 70)
+ c->stop += 2000;
- if (c->value >= 70 && c->value < 100)
- c->value += 1900;
+ if (c->start >= 70 && c->start < 100)
+ c->start += 1900;
- c = n;
+ if (c->stop >= 70 && c->stop < 100)
+ c->stop += 1900;
+
+ c = c->next;
}
}
@@ -143,12 +159,12 @@ int calendar_spec_normalize(CalendarSpec *c) {
fix_year(c->year);
- sort_chain(&c->year);
- sort_chain(&c->month);
- sort_chain(&c->day);
- sort_chain(&c->hour);
- sort_chain(&c->minute);
- sort_chain(&c->microsecond);
+ normalize_chain(&c->year);
+ normalize_chain(&c->month);
+ normalize_chain(&c->day);
+ normalize_chain(&c->hour);
+ normalize_chain(&c->minute);
+ normalize_chain(&c->microsecond);
return 0;
}
@@ -157,20 +173,32 @@ _pure_ static bool chain_valid(CalendarComponent *c, int from, int to, bool end_
if (!c)
return true;
- if (c->value < from || c->value > to)
+ /* Forbid dates more than 28 days from the end of the month */
+ if (end_of_month)
+ to -= 3;
+
+ if (c->start < from || c->start > to)
return false;
/*
* c->repeat must be short enough so at least one repetition may
* occur before the end of the interval. For dates scheduled
- * relative to the end of the month, c->value corresponds to the
- * Nth last day of the month.
+ * relative to the end of the month, c->start and c->stop
+ * correspond to the Nth last day of the month.
*/
- if (end_of_month && c->value - c->repeat < from)
- return false;
+ if (c->stop >= 0) {
+ if (c->stop < from || c ->stop > to)
+ return false;
- if (!end_of_month && c->value + c->repeat > to)
- return false;
+ if (c->start + c->repeat > c->stop)
+ return false;
+ } else {
+ if (end_of_month && c->start - c->repeat < from)
+ return false;
+
+ if (!end_of_month && c->start + c->repeat > to)
+ return false;
+ }
if (c->next)
return chain_valid(c->next, from, to, end_of_month);
@@ -255,7 +283,6 @@ static void format_weekdays(FILE *f, const CalendarSpec *c) {
}
static void format_chain(FILE *f, int space, const CalendarComponent *c, bool usec) {
- const CalendarComponent *n, *p;
int d = usec ? (int) USEC_PER_SEC : 1;
assert(f);
@@ -265,41 +292,34 @@ static void format_chain(FILE *f, int space, const CalendarComponent *c, bool us
return;
}
- assert(c->value >= 0);
-
- fprintf(f, "%0*i", space, c->value / d);
- if (c->value % d != 0)
- fprintf(f, ".%06i", c->value % d);
+ if (usec && c->start == 0 && c->repeat == USEC_PER_SEC && !c->next) {
+ fputc('*', f);
+ return;
+ }
- if (c->repeat != 0)
- fprintf(f, "/%i", c->repeat / d);
- if (c->repeat % d != 0)
- fprintf(f, ".%06i", c->repeat % d);
+ assert(c->start >= 0);
- p = c;
- for (;;) {
- n = p->next;
+ fprintf(f, "%0*i", space, c->start / d);
+ if (c->start % d > 0)
+ fprintf(f, ".%06i", c->start % d);
- if (!n || n->repeat || p->repeat)
- break;
+ if (c->stop > 0)
+ fprintf(f, "..%0*i", space, c->stop / d);
+ if (c->stop % d > 0)
+ fprintf(f, ".%06i", c->stop % d);
- if (n->value - p->value != d)
- break;
-
- p = n;
- }
+ if (c->repeat > 0 && !(c->stop > 0 && c->repeat == d))
+ fprintf(f, "/%i", c->repeat / d);
+ if (c->repeat % d > 0)
+ fprintf(f, ".%06i", c->repeat % d);
- if (p->value - c->value >= 2 * d) {
- fputs("..", f);
- format_chain(f, space, p, usec);
- } else if (c->next) {
+ if (c->next) {
fputc(',', f);
format_chain(f, space, c->next, usec);
}
}
int calendar_spec_to_string(const CalendarSpec *c, char **p) {
- CalendarComponent *cc;
char *buf = NULL;
size_t sz = 0;
FILE *f;
@@ -327,12 +347,7 @@ int calendar_spec_to_string(const CalendarSpec *c, char **p) {
fputc(':', f);
format_chain(f, 2, c->minute, false);
fputc(':', f);
-
- cc = c->microsecond;
- if (cc && !cc->value && cc->repeat == USEC_PER_SEC && !cc->next)
- fputc('*', f);
- else
- format_chain(f, 2, c->microsecond, true);
+ format_chain(f, 2, c->microsecond, true);
if (c->utc)
fputs(" UTC", f);
@@ -462,7 +477,7 @@ static int parse_weekdays(const char **p, CalendarSpec *c) {
*p += 1;
}
- /* Allow a trailing comma but not an open range */
+ /* Allow a trailing comma but not an open range */
if (**p == 0 || **p == ' ') {
*p += strspn(*p, " ");
return l < 0 ? 0 : -EINVAL;
@@ -530,7 +545,8 @@ static int const_chain(int value, CalendarComponent **c) {
if (!cc)
return -ENOMEM;
- cc->value = value;
+ cc->start = value;
+ cc->stop = -1;
cc->repeat = 0;
cc->next = *c;
@@ -540,7 +556,7 @@ static int const_chain(int value, CalendarComponent **c) {
}
static int prepend_component(const char **p, bool usec, CalendarComponent **c) {
- unsigned long i, value, range_end, range_inc, repeat = 0;
+ unsigned long start, stop = -1, repeat = 0;
CalendarComponent *cc;
int r;
const char *e;
@@ -550,10 +566,19 @@ static int prepend_component(const char **p, bool usec, CalendarComponent **c) {
e = *p;
- r = parse_component_decimal(&e, usec, &value);
+ 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);
@@ -562,30 +587,6 @@ static int prepend_component(const char **p, bool usec, CalendarComponent **c) {
if (repeat == 0)
return -ERANGE;
- } else if (e[0] == '.' && e[1] == '.') {
- e += 2;
- r = parse_component_decimal(&e, usec, &range_end);
- if (r < 0)
- return r;
-
- if (value >= range_end)
- return -EINVAL;
-
- range_inc = usec ? USEC_PER_SEC : 1;
-
- /* Don't allow impossibly large ranges... */
- if (range_end - value >= MAX_RANGE_LEN * range_inc)
- return -EINVAL;
-
- /* ...or ranges with only a single element */
- if (range_end - value < range_inc)
- return -EINVAL;
-
- for (i = value; i <= range_end; i += range_inc) {
- r = const_chain(i, c);
- if (r < 0)
- return r;
- }
}
if (*e != 0 && *e != ' ' && *e != ',' && *e != '-' && *e != '~' && *e != ':')
@@ -595,7 +596,8 @@ static int prepend_component(const char **p, bool usec, CalendarComponent **c) {
if (!cc)
return -ENOMEM;
- cc->value = value;
+ cc->start = start;
+ cc->stop = stop;
cc->repeat = repeat;
cc->next = *c;
@@ -1014,11 +1016,24 @@ fail:
return r;
}
+static int find_end_of_month(struct tm *tm, bool utc, int day)
+{
+ struct tm t = *tm;
+
+ t.tm_mon++;
+ t.tm_mday = 1 - day;
+
+ if (mktime_or_timegm(&t, utc) == (time_t) -1 ||
+ t.tm_mon != tm->tm_mon)
+ return -1;
+
+ return t.tm_mday;
+}
+
static int find_matching_component(const CalendarSpec *spec, const CalendarComponent *c,
struct tm *tm, int *val) {
- const CalendarComponent *n, *p = c;
- struct tm t;
- int v, d = -1;
+ const CalendarComponent *p = c;
+ int start, stop, d = -1;
bool d_set = false;
int r;
@@ -1028,40 +1043,36 @@ static int find_matching_component(const CalendarSpec *spec, const CalendarCompo
return 0;
while (c) {
- n = c->next;
+ start = c->start;
+ stop = c->stop;
if (spec->end_of_month && p == spec->day) {
- t = *tm;
- t.tm_mon++;
- t.tm_mday = 1 - c->value;
-
- if (mktime_or_timegm(&t, spec->utc) == (time_t) -1 ||
- t.tm_mon != tm->tm_mon)
- v = -1;
- else
- v = t.tm_mday;
- } else
- v = c->value;
+ start = find_end_of_month(tm, spec->utc, start);
+ stop = find_end_of_month(tm, spec->utc, stop);
- if (v >= *val) {
+ if (stop > 0)
+ SWAP_TWO(start, stop);
+ }
+
+ if (start >= *val) {
- if (!d_set || v < d) {
- d = v;
+ if (!d_set || start < d) {
+ d = start;
d_set = true;
}
} else if (c->repeat > 0) {
int k;
- k = v + c->repeat * ((*val - v + c->repeat -1) / c->repeat);
+ k = start + c->repeat * ((*val - start + c->repeat - 1) / c->repeat);
- if (!d_set || k < d) {
+ if ((!d_set || k < d) && (stop < 0 || k <= stop)) {
d = k;
d_set = true;
}
}
- c = n;
+ c = c->next;
}
if (!d_set)
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-24 18:00:53 +0000